Some standard content:
ICS 17-140
17.140.30
National Standard of the People's Republic of China
GB/T4595—2000
idt 1s0 2923: 1996
Measurement of noise on board
Vessels2000-08-28 Issued
2001-07-01 Implementation
State Administration of Quality and Technical Supervision Issued
WGB/T4595—2000
This standard can adopt the international standard IS02923:1996 Shipboard Noise Measurement3, and revise GB/T4595--1984. This standard is significantly different from the original national standard. For example, 1> Measurement parameters: equivalent continuous A-weighted sound pressure level replaces A-weighted sound pressure level, octave band adopts equivalent continuous sound level, when the noise level exceeds 130 dB, C-weighted maximum sound pressure level is adopted+2> Measurement time, 10 s replaces 5s; 3> Measurement instrument, split average sound level replaces ordinary E-weighted sound level; 4> Measurement base location and scope are wider; 5) End-to-end type, cited standards replace references and added definitions, etc. At the same time, it supplements the omission of the square of the sound pressure P(t) in the equation of definition 3.7 of ISO 2923:1996 version, and cancels the technical errata table 1 for the description of this content. The appendix of this standard is attached.
This standard replaces GB/T4595-1984 from the date of entry into force. This standard is proposed by the Ministry of Communications of the People's Republic of China. The drafting unit of this standard: Shanghai Institute of Transportation Science of the Ministry of Communications, Wuhan University of Technology. The main drafters of this standard: Zhou Xuji, Weng Changjian. This standard was first issued in 1984 and the first edition was issued at the end of 1999.
GB/F4595-2000
ISO Foreword
ISO (International Organization for Standardization) is: a world federation of international standardization bodies (ISO member bodies). The work of formulating international standards is usually carried out by ISO (member bodies) technical committees. If the group members are interested in the proposals raised by the technical committee, they have the right to send representatives to the committee meetings. Official or unofficial international organizations related to 150 may also participate in this work. In the standardization of electrotechnical technology, IS) works closely with the Technical Committee for Inductive Electrotechnical Engineering (IEC). The international standard proposals passed by the technical committee are first circulated among the group members. At least 75% of the group members need to vote in favor of the international standard before it can be officially published.
IS02923 International Standard was proposed by ISO/TC:43, Noise Subcommittee SC1, Acoustics Technical Committee. This second edition is technically sufficient for the first edition (IS02923:1975) and replaces it. Appendix A of this standard is an informative appendix. 1 Scope National Standard of the People's Republic of China Measurement of noise on board vessels GB/T4595-2000 IDT ISO 2923:1996 159: This standard specifies the technology and conditions for the repeatable and comparable measurement of noise levels on board ships and seagoing vessels. The measurement results are mainly used for comparison of various types of ships: - During the ship delivery and acceptance test, as a comparison with the indicators specified in the domestic or international regulations and the shipowner's technical specifications; - Monitoring test - As a basis for further research and noise reduction measures; As a basis for evaluating noise exposure and the impact of noise on the ship; - Evaluation of the clarity of speech: - Evaluation of the audibility of sound signals.
The uncertainty of the measurement results depends on several factors, such as the measurement technique and environmental conditions. However, as long as the measurement is carried out in accordance with this standard, the uncertainty of the equivalent continuous A-weighted sound pressure level is 10 or less. B2 Referenced standards
The following standards contain provisions that, when used in this standard, constitute the provisions of this standard. At the time of publication of this standard, the versions shown are valid. All standards are subject to revision and parties using this standard should investigate the possibility of using the latest versions of the following standards. IEC:651:1979 Sound level meter standard 1.1993 1EC:804:1985 Integrating average sound level meter standard 1:1989, amendment 2 + 1993 JEC912:1988 Acoustic calibrator
18:1260:1095 Electroacoustic octave and fractional-range filters 3 Definitions
This standard adopts the following definitions.
3.1 Living quarters sccommodationspares, bedrooms, offices (for ship auxiliary business), infirmary, dining and recreation rooms, 3.21 Duty stations
refers to cabins equipped with main command and control facilities, ship's radio equipment or emergency power supply, or equipped with fire and rescue equipment or fire-fighting equipment. This type of workplace also includes reception room, catering room, washroom, storage room (except independent catering room and small emergency room), mail room, supply item storage room, centralized control room, work room except engine room spare parts room, and similar connected cabins. 3.3 Machinery space machinerygpace
refers to cabins equipped with propulsion equipment, boiler, fuel equipment, electric motors and engines, generators and main air power equipment, cargo machinery, oil purification equipment, refrigeration, cooling, ventilation and air-conditioning equipment and similar equipment, as well as passages connecting these cabins. 3.4 Delivery and acceptance tests delivery and acceptance texts State Administration of Quality and Technical Supervision 200008:28 approved 20010701 implementation
WGB/T45952000
Tests to determine whether the ship meets the noise limit requirements specified in the technical specifications after construction is completed or after major repairs. 3.5 Monitoring tests
Tests to evaluate the changes in noise production caused by actual navigation after delivery or repairs. 3.6 Sound pressure level soundpressutelevel, Lp The sound pressure level of sound or noise, in dB, is given by the following formula: g = 10g g
Where P----sound pressure, Pae
P——reference sound pressure (-20 μPa)
A-weighted sound pressure, in dB, which can be obtained by the A-weighted frequency specified in IEC651 for the measurement of sound pressure level: 3.7 Equivalent continuous sound pressure level equivalentcontinuoussoundpressurelevelLea The sound pressure of the continuous steady-state sound in the measurement period T has the mean square sound pressure alternating with the noise that changes with time. Then the sound pressure level of this continuous steady-state sound is the equivalent sound pressure level of the noise that changes with time in the measurement period T, in units. It is given by the following formula atdB
L = 10g[J., P
Where: (-1) is the period, and the average is taken within the period of the start time and the end time. Note: Subscript \1\ may be omitted.
3.8 Impulsive noise
An isolated event of less than 1s duration, or one of the continuous events with a repetition rate of less than 15 times/s. The presence of impulse noise can be confirmed by the difference between the equivalent continuous sound pressure levels measured with time weighting I and F. If the difference is greater than 2dB, the presence of impulse noise can be assumed.
3.9 Tonal sound
A monotonous sound that is easily audible.
The instrument system including microphone, cable and recording equipment shall comply with the requirements of Type 1 instrument specified in IEC651, or in the case of an integrating average sound level meter, the instrument system shall comply with the requirements specified in IFC804. Note: If the noise level is less than 5 dB from the loudest to the quietest passive level, a non-integrating average sound level meter with a time weighting of seconds may be used, and the average reading measured within not less than 103 may be used to indicate the minimum sound pressure level. The microphone shall be calibrated to have a uniform frequency response in the sound field. The octave or 1/3 octave filter shall comply with the requirements of IEC 1260. If a windshield is used, it shall have a negligible effect on the A-meter sound pressure level measured in the absence of wind (0.5 dB). The microphone shall be calibrated with an acoustic calibrator with an accuracy of 3 dB (according to IEC 912, Class 1) before and after each measurement.To verify that the calibration of the entire test system is within one or more specified accuracy ranges: According to IE542, the calibrator shall be calibrated at least once a year. According to IE651, the entire instrument system, or according to IEC 804, the integrated average sound level meter system used, shall be calibrated at least once every two years. According to the relevant standards, the date of the most recent calibration and confirmation shall be recorded: 5 Measurement environment
5.1 General
The water depth below the bottom of the ship, if less than 5 meters of draft, and the large reflective surface near the cabin, shall be stated in the test report. Note 1t Inland waterways, the draft cannot meet the meteorological conditions such as wind, rain and sea conditions should not affect the measurement. Meteorological conditions should be formally recorded. If in actual conditions, when the wind force exceeds level 4 and the wave height is greater than 1m, the measurement should be stopped. 5.2 Background noise
GB/T4595-.200 electric
Noise from external sound sources (such as people, work, wind, waves, etc.) should not affect the sound pressure level of the measured part 6 Measurement parameters
Basic measurement parameters are:
Equivalent continuous A-weighted sound pressure level:
-When the noise may exceed 130d3, use C-expanded peak sound pressure level; -If required, the equivalent continuous sound pressure level of 31.5~8000Hz octave band: pulse net noise (determined by definition) +
-adjusted sound (determined by hearing sense).
7 Ship operation status
7.1 Navigation status
The ship should be in full load or full load state, the loading state should be recorded, and the ship's line should be kept as straight as possible. The ship shall be tested in upstream or downstream or in still water when on inland waterways. The main engine shall be operated at a normal operating speed of not less than 80% of the maximum continuous power (MCR). The main engine of inland ships shall be operated at the necessary condition of not less than the minimum continuous power (MCR). The adjustable propeller and propeller shall be in the position of normal speed and outputting normal power. All auxiliary engines, navigation instruments and necessary equipment that are usually used or may be used at any time shall be started and operated during the whole measurement period, and the radio communication shall be connected, but not in the working state. The test compartments include emergency diesel engine driven generators, fire pumps or other emergency equipment. These equipment are usually only operated in emergency or return test. However, during the test, all equipment in these compartments shall be operated. The core ventilation and air conditioning equipment shall be operated normally, and its operating conditions shall be consistent with the design status. All doors and balances should be closed, unless the door is opened in normal use. For example, the door on the side of the driving car is open. The cabin should have all necessary equipment and furnishings. If there is no soft furniture and decoration, the test results will not be corrected. 7.2 Port operation status
For areas susceptible to the impact of the ship's loading and unloading equipment, the noise level of the accommodation cabin should be measured when the loading and unloading equipment is working. In the case of a ship carrying cars or a roll-on/roll-off ship (RO/RO), during loading and unloading, the noise is caused by the start of the car. The noise level and exposure duration of the cargo hold should be measured. B. Measurement procedure
8.1 General
During the measurement, the microphone should be at a height of 1.2 m (the height of the minimum person end) and 1.6 m above the pole. m (the height of a person standing). The distance between the instrument position and the surrounding interface of the cabin should not be less than 0.5 m2. During the measurement, only the crew members who are operating the test are allowed to be present. Taking into account the uncertainty of the entire measurement, the measurement time should be long enough, with a rate of at least 10, so that the equivalent continuous A-weighted acoustic noise measurement can be completed within the extended time interval.
For a large cargo hold, at least one source is assumed. In other cabins that are not exposed, the measurement points in the entire cabin should be not less than 2m and not more than 7m. These measurement points should include the maximum noise position, positions close to other types of noise sources (such as air circulation Noise measurements should be made at manned workplaces, including at the station. When operating, equipment such as thrusters, stabilizers, cargo hold ventilation, etc., generate high-intensity noise. When these machines are operating, noise measurements should be made around them and in related accommodation cabins and duty stations. If necessary, the noise exposure of the crew should be measured, or the exposure time, in order to calculate the noise exposure of the operator. When taking observations outside the cabin (such as on the wings of the bridge or the sky deck) and on the lower deck where there is significant air movement, a conventional windshield should be used.
Evaluation and recording:
—Pulse The presence of noise (defined by definition)
. The presence of noise (determined by hearing).
GB/T4595—2000
8.2 Accommodation
Measurement For all accommodations, at least one cabin with the highest noise level on each deck shall be measured in octave bands. In sleeping rooms and infirmaries, measurements shall be made in the center of the cabin. In the room, especially in the area near the head of a sitting or lying person, if there is a significant difference in noise level, additional measurements shall be made at these locations. 8.3 Machinery space
None Noise measurements should be made at important workplaces and places that need to be inspected during routine inspections, adjustments and maintenance, as well as places where entry and exit passages are usually used. Special attention should be paid to important places for telephone rooms, audio communications and sound signals. In addition, noise measurements should be made at a distance of about 1m from the main engine and any machine or equipment that produces special noise. Usually, noise measurements are not made within 1m of the measuring point from the working main engine, air inlet, middle plate, bulkhead or other large surface. If measurements must be made, the measurements should be made at the middle position between the machine and the nearest reflecting surface. At least two places where the maximum value of the A-weighted sound pressure level is measured should be measured with multiple ranges. In places such as large main engines and engine rooms, the A-weighted sound pressure level values measured point by point at the above-mentioned spacing positions will not change greatly. In order to avoid a large number of meaningless measurements and records, it is not necessary to record at each location. Only those places that represent compensation and maximum sound pressure levels should be fully measured and recorded. At least four points on each deck should be measured and recorded. 8.4 Watch places
Measurements should be made in places where speech communication and signal clarity are important. Measurements should be made only on the leeward side of the ship on both wings of the bridge. If there is a significant difference in the noise level inside the cabin as mentioned above, additional measurements should be made at this point. Additional measurements should be made in all places where people are normally working (such as cargo holds and deck areas). Measurements should be made in all places where personnel may be exposed to high noise levels. For reasons of navigation and safety, where speech clarity is important, octave band measurements should be made. B.5 Entertainment places
Any place where entertainment is provided for a day and high noise levels are found after preliminary investigation, additional measurements should be made. 9 Measurement report
Report all test results, including the referenced standard and related details as follows: a) Nature of test:
h) Ship status, ship main engine parameters, main engine power and main engine speed during test, and setting position of adjustable pitch propeller or vertical wing propeller:
c) Auxiliary equipment and their operating status; d) Ship loading:
e) Test location, water depth below the bottom of the ship and meteorological conditions, wind and sea conditions; Measurement equipment:
) Measurement Name and address of the person to be notified,
h) Microphone location:
\Equivalent continuous A-weighted sound pressure level 1
) If necessary, give the peak C-weighted sound pressure level:) Noise spectrum:
1) If required, give the basic results of noise exposure such as 24h equivalent continuous sound pressure level and calculation:) Existence of noise or impulse characteristic noise:) Instructions on which windows and doors are opened,
n) Indicate the relevant noise sources on board: P) The main noise measures to be applied on board.
bzsos.comGB/T 4595—2000
Appendix A
(Indicative Appendix)
Catalogue
: 1/JMO168 (Resolution Noise Level Standard for Ships)Equivalent continuous sound pressure level of 5~8000Hz octave band: pure pulse noise (determined by definition) +
- adjustable sound (determined by auditory perception).
7 Ship operation status
7.1 Navigation status
The test vessel should be in full load or unloaded state, the loading status should be recorded, and the ship's line should be kept as straight as possible. The ship should be tested on inland waterways in upstream or downstream or in still water. The main engine should be operated at a normal operating speed and not less than 80% of the maximum continuous power (MCR). The main engine of inland ships should be operated under the necessary conditions of not less than the minimum continuous power (MCR). Adjustable propeller and propeller should be in the position of normal speed and outputting normal power. All auxiliary engines, navigation instruments and necessary equipment that are usually used or may be used at any time should be started and operated during the entire measurement period, and radio communications should be connected, but not in working state. The test compartments include emergency diesel engine driven generators, fire pumps or other emergency equipment. These equipment are usually only operated in emergency or return tests, but during the test, all equipment in these compartments should be operated. The core ventilation and air conditioning equipment should be operated normally, and its working condition should be consistent with the design status. All doors and balances should be closed, unless the door is opened in normal use. For example, the door on the side of the driving car is open. The cabin should have all necessary equipment and furnishings. If there is no soft furniture and decoration, the test results will not be corrected. 7.2 Port operation status
For areas susceptible to the impact of the ship's loading and unloading equipment, the noise level of the accommodation cabin should be measured when the loading and unloading equipment is working. In the case of a ship carrying cars or a roll-on/roll-off ship (RO/RO), during loading and unloading, the noise is caused by the start of the car. The noise level and exposure duration of the cargo hold should be measured. B. Measurement procedure
8.1 General
During the measurement, the microphone should be at a height of 1.2 m (the height of the minimum person end) and 1.6 m above the pole. m (the height of a person standing). The distance between the instrument position and the surrounding interface of the cabin should not be less than 0.5 m2. During the measurement, only the crew members who are operating the test are allowed to be present. Taking into account the uncertainty of the entire measurement, the measurement time should be long enough, with a rate of at least 10, so that the equivalent continuous A-weighted acoustic noise measurement can be completed within the extended time interval.
For a large cargo hold, at least one source is assumed. In other cabins that are not exposed, the measurement points in the entire cabin should be not less than 2m and not more than 7m. These measurement points should include the maximum noise position, positions close to other types of noise sources (such as air circulation Noise measurements should be made at manned workplaces, including at the station. When operating, equipment such as thrusters, stabilizers, cargo hold ventilation, etc., generate high-intensity noise. When these machines are operating, noise measurements should be made around them and in related accommodation cabins and duty stations. If necessary, the noise exposure of the crew should be measured, or the exposure time, in order to calculate the noise exposure of the operator. When taking observations outside the cabin (such as on the wings of the bridge or the sky deck) and on the lower deck where there is significant air movement, a conventional windshield should be used.
Evaluation and recording:
—Pulse The presence of noise (defined by definition)
. The presence of noise (determined by hearing).
GB/T4595—2000
8.2 AccommodationbZxz.net
Measurement For all accommodations, at least one cabin with the highest noise level on each deck shall be measured in octave bands. In sleeping rooms and infirmaries, measurements shall be made in the center of the cabin. In the room, especially in the area near the head of a sitting or lying person, if there is a significant difference in noise level, additional measurements shall be made at these locations. 8.3 Machinery space
None Noise measurements should be made at important workplaces and places that need to be inspected during routine inspections, adjustments and maintenance, as well as places where entry and exit passages are usually used. Special attention should be paid to important places for telephone rooms, audio communications and sound signals. In addition, noise measurements should be made at a distance of about 1m from the main engine and any machine or equipment that produces special noise. Usually, noise measurements are not made within 1m of the measuring point from the working main engine, air inlet, middle plate, bulkhead or other large surface. If measurements must be made, the measurements should be made at the middle position between the machine and the nearest reflecting surface. At least two places where the maximum value of the A-weighted sound pressure level is measured should be measured with multiple ranges. In places such as large main engines and engine rooms, the A-weighted sound pressure level values measured point by point at the above-mentioned spacing positions will not change greatly. In order to avoid a large number of meaningless measurements and records, it is not necessary to record at each location. Only those places that represent compensation and maximum sound pressure levels should be fully measured and recorded. At least four points on each deck should be measured and recorded. 8.4 Watch places
Measurements should be made in places where speech communication and signal clarity are important. Measurements should be made only on the leeward side of the ship on both wings of the bridge. If there is a significant difference in the noise level inside the cabin as mentioned above, additional measurements should be made at this point. Additional measurements should be made in all places where people are normally working (such as cargo holds and deck areas). Measurements should be made in all places where personnel may be exposed to high noise levels. For reasons of navigation and safety, where speech clarity is important, octave band measurements should be made. B.5 Entertainment places
Any place where entertainment is provided for a day and high noise levels are found after preliminary investigation, additional measurements should be made. 9 Measurement report
Report all test results, including the referenced standard and related details as follows: a) Nature of test:
h) Ship status, ship main engine parameters, main engine power and main engine speed during test, and setting position of adjustable pitch propeller or vertical wing propeller:
c) Auxiliary equipment and their operating status; d) Ship loading:
e) Test location, water depth below the bottom of the ship and meteorological conditions, wind and sea conditions; Measurement equipment:
) Measurement Name and address of the person to be notified,
h) Microphone location:
\Equivalent continuous A-weighted sound pressure level 1
) If necessary, give the peak C-weighted sound pressure level:) Noise spectrum:
1) If required, give the basic results of noise exposure such as 24h equivalent continuous sound pressure level and calculation:) Existence of noise or impulse characteristic noise:) Instructions on which windows and doors are opened,
n) Indicate the relevant noise sources on board: P) The main noise measures to be applied on board.
bzsos.comGB/T 4595—2000
Appendix A
(Indicative Appendix)
Catalogue
: 1/JMO168 (Resolution Noise Level Standard for Ships)Equivalent continuous sound pressure level of 5~8000Hz octave band: pure pulse noise (determined by definition) +
- adjustable sound (determined by auditory perception).
7 Ship operation status
7.1 Navigation status
The test vessel should be in full load or unloaded state, the loading status should be recorded, and the ship's line should be kept as straight as possible. The ship should be tested on inland waterways in upstream or downstream or in still water. The main engine should be operated at a normal operating speed and not less than 80% of the maximum continuous power (MCR). The main engine of inland ships should be operated under the necessary conditions of not less than the minimum continuous power (MCR). Adjustable propeller and propeller should be in the position of normal speed and outputting normal power. All auxiliary engines, navigation instruments and necessary equipment that are usually used or may be used at any time should be started and operated during the entire measurement period, and radio communications should be connected, but not in working state. The test compartments include emergency diesel engine driven generators, fire pumps or other emergency equipment. These equipment are usually only operated in emergency or return tests, but during the test, all equipment in these compartments should be operated. The core ventilation and air conditioning equipment should be operated normally, and its working condition should be consistent with the design status. All doors and balances should be closed, unless the door is opened in normal use. For example, the door on the side of the driving car is open. The cabin should have all necessary equipment and furnishings. If there is no soft furniture and decoration, the test results will not be corrected. 7.2 Port operation status
For areas susceptible to the impact of the ship's loading and unloading equipment, the noise level of the accommodation cabin should be measured when the loading and unloading equipment is working. In the case of a ship carrying cars or a roll-on/roll-off ship (RO/RO), during loading and unloading, the noise is caused by the start of the car. The noise level and exposure duration of the cargo hold should be measured. B. Measurement procedure
8.1 General
During the measurement, the microphone should be at a height of 1.2 m (the height of the minimum person end) and 1.6 m above the pole. m (the height of a person standing). The distance between the instrument position and the surrounding interface of the cabin should not be less than 0.5 m2. During the measurement, only the crew members who are operating the test are allowed to be present. Taking into account the uncertainty of the entire measurement, the measurement time should be long enough, with a rate of at least 10, so that the equivalent continuous A-weighted acoustic noise measurement can be completed within the extended time interval.
For a large cargo hold, at least one source is assumed. In other cabins that are not exposed, the measurement points in the entire cabin should be not less than 2m and not more than 7m. These measurement points should include the maximum noise position, positions close to other types of noise sources (such as air circulation Noise measurements should be made at manned workplaces, including at the station. When operating, equipment such as thrusters, stabilizers, cargo hold ventilation, etc., generate high-intensity noise. When these machines are operating, noise measurements should be made around them and in related accommodation cabins and duty stations. If necessary, the noise exposure of the crew should be measured, or the exposure time, in order to calculate the noise exposure of the operator. When taking observations outside the cabin (such as on the wings of the bridge or the sky deck) and on the lower deck where there is significant air movement, a conventional windshield should be used.
Evaluation and recording:
—Pulse The presence of noise (defined by definition)
. The presence of noise (determined by hearing).
GB/T4595—2000
8.2 Accommodation
Measurement For all accommodations, at least one cabin with the highest noise level on each deck shall be measured in octave bands. In sleeping rooms and infirmaries, measurements shall be made in the center of the cabin. In the room, especially in the area near the head of a sitting or lying person, if there is a significant difference in noise level, additional measurements shall be made at these locations. 8.3 Machinery space
None Noise measurements should be made at important workplaces and places that need to be inspected during routine inspections, adjustments and maintenance, as well as places where entry and exit passages are usually used. Special attention should be paid to important places for telephone rooms, audio communications and sound signals. In addition, noise measurements should be made at a distance of about 1m from the main engine and any machine or equipment that produces special noise. Usually, noise measurements are not made within 1m of the measuring point from the working main engine, air inlet, middle plate, bulkhead or other large surface. If measurements must be made, the measurements should be made at the middle position between the machine and the nearest reflecting surface. At least two places where the maximum value of the A-weighted sound pressure level is measured should be measured with multiple ranges. In places such as large main engines and engine rooms, the A-weighted sound pressure level values measured point by point at the above-mentioned spacing positions will not change greatly. In order to avoid a large number of meaningless measurements and records, it is not necessary to record at each location. Only those places that represent compensation and maximum sound pressure levels should be fully measured and recorded. At least four points on each deck should be measured and recorded. 8.4 Watch places
Measurements should be made in places where speech communication and signal clarity are important. Measurements should be made only on the leeward side of the ship on both wings of the bridge. If there is a significant difference in the noise level inside the cabin as mentioned above, additional measurements should be made at this point. Additional measurements should be made in all places where people are normally working (such as cargo holds and deck areas). Measurements should be made in all places where personnel may be exposed to high noise levels. For reasons of navigation and safety, where speech clarity is important, octave band measurements should be made. B.5 Entertainment places
Any place where entertainment is provided for a day and high noise levels are found after preliminary investigation, additional measurements should be made. 9 Measurement report
Report all test results, including the referenced standard and related details as follows: a) Nature of test:
h) Ship status, ship main engine parameters, main engine power and main engine speed during test, and setting position of adjustable pitch propeller or vertical wing propeller:
c) Auxiliary equipment and their operating status; d) Ship loading:
e) Test location, water depth below the bottom of the ship and meteorological conditions, wind and sea conditions; Measurement equipment:
) Measurement Name and address of the person to be notified,
h) Microphone location:
\Equivalent continuous A-weighted sound pressure level 1
) If necessary, give the peak C-weighted sound pressure level:) Noise spectrum:
1) If required, give the basic results of noise exposure such as 24h equivalent continuous sound pressure level and calculation:) Existence of noise or impulse characteristic noise:) Instructions on which windows and doors are opened,
n) Indicate the relevant noise sources on board: P) The main noise measures to be applied on board.
bzsos.comGB/T 4595—2000
Appendix A
(Indicative Appendix)
Catalogue
: 1/JMO168 (Resolution Noise Level Standard for Ships)5㎡. During the measurement, only the crew members who are operating the test are allowed to be present. Taking into account the uncertainty of the whole measurement, the measurement time should be long enough, with a minimum rate of 10, so that the equivalent continuous A-weighted noise measurement can be completed within the extended time interval.
For a large cargo hold, at least one assumption is made. In other unequipped cabins, the measurement points in the entire cabin should be no less than 2m and no more than 7m. These measurement points should include the maximum noise position, the position close to other types of noise sources (such as the inlet and outlet of the air circulation system). Noise measurements should be made at the workplace of the personnel, including the station. When the thrusters, stabilizers, cargo hold ventilation and other equipment are working, they will generate high-intensity noise. When these machines are working, the noise measurements should be made in the surrounding and related living cabins and duty positions. If necessary, the noise exposure of the crew should be measured, or the exposure time, in order to calculate the operator's noise exposure. When taking a lookout outside a cabin (e.g. on the bridge wings or on the sundeck) and on a lower deck where there is noticeable air movement, a group wind should be used.
Evaluate and record:
- Presence of impulse noise (defined by definition)
Presence of audible noise (determined by hearing).
GB/T4595—2000
8.2 Accommodation
Measurement For all accommodation cabins, at least one cabin per deck with the highest noise level should be measured in octave bands. In sleeping rooms and infirmaries, measurements should be taken at the center of the cabin. Inside the room, especially at the position near the head of a person sitting or lying down. If there is a significant difference in noise level, additional measurements should be made at these positions. 8.3 Mechanical Locations
Noise measurements shall be made at all important work places and places that are visited during routine inspection, adjustment and maintenance, as well as places where inlets and outlets are usually used. Special attention shall be paid to important places for telephone rooms, audio communications and sound signals. In addition, noise measurements shall be made at a distance of about 1m from the main engine and any machine or equipment that generates characteristic noise. Usually, noise measurements shall not be made within 1m of the measuring point from the main engine in operation, air inlet, mid-panel, bulkhead or other large surface. If measurements must be made, they shall be made at the mid-position between the machine and the nearest reflecting surface. At least two places where the maximum A-weighted sound pressure level is measured shall be measured with multiple ranges. In places such as large main engines and engine rooms, the A-weighted sound pressure level values measured point by point at the above-mentioned spacing positions will not vary greatly. In order to avoid a large number of meaningless measurements and records, it is not necessary to record at each location. Only those places with representative compensation and maximum sound pressure levels shall be fully measured and recorded. At least four points on each deck shall be measured and recorded. 8.4 Watch places
Measurements shall be made at places where speech communication and signal clarity are important. Measurements shall be made on the leeward side of the ship on both wings of the bridge. If there is a significant difference in the noise level inside the cabin as mentioned above, additional measurements shall be made at this point. Additional measurements shall be made at all normal working places (such as cargo holds and deck areas). Measurements shall be made at all places where personnel may be exposed to high noise levels. For reasons of navigation and safety, where speech clarity is important, octave band measurements shall be made. B.5 Entertainment places
Any place that provides entertainment as a day and has high noise levels after preliminary investigation shall be additionally measured. 9 Measurement report
Report all test results, including the referenced standard and related details as follows: a) Nature of test:
h) Ship status, ship main engine parameters, main engine power and main engine speed during test, and setting position of adjustable pitch propeller or vertical wing propeller:
c) Auxiliary equipment and their operating status; d) Ship loading:
e) Test location, water depth below the bottom of the ship and meteorological conditions, wind and sea conditions; Measurement equipment:
) Measurement Name and address of the person to be notified,
h) Microphone location:
\Equivalent continuous A-weighted sound pressure level 1
) If necessary, give the peak C-weighted sound pressure level:) Noise spectrum:
1) If required, give the basic results of noise exposure such as 24h equivalent continuous sound pressure level and calculation:) Existence of noise or impulse characteristic noise:) Instructions on which windows and doors are opened,
n) Indicate the relevant noise sources on board: P) The main noise measures to be applied on board.
bzsos.comGB/T 4595—2000
Appendix A
(Indicative Appendix)
Catalogue
: 1/JMO168 (Resolution Noise Level Standard for Ships)5㎡. During the measurement, only the crew members who are operating the test are allowed to be present. Taking into account the uncertainty of the whole measurement, the measurement time should be long enough, with a minimum rate of 10, so that the equivalent continuous A-weighted noise measurement can be completed within the extended time interval.
For a large cargo hold, at least one assumption is made. In other unequipped cabins, the measurement points in the entire cabin should be no less than 2m and no more than 7m. These measurement points should include the maximum noise position, the position close to other types of noise sources (such as the inlet and outlet of the air circulation system). Noise measurements should be made at the workplace of the personnel, including the station. When the thrusters, stabilizers, cargo hold ventilation and other equipment are working, they will generate high-intensity noise. When these machines are working, the noise measurements should be made in the surrounding and related living cabins and duty positions. If necessary, the noise exposure of the crew should be measured, or the exposure time, in order to calculate the operator's noise exposure. When taking a lookout outside a cabin (e.g. on the bridge wings or on the sundeck) and on a lower deck where there is noticeable air movement, a group wind should be used.
Evaluate and record:
- Presence of impulse noise (defined by definition)
Presence of audible noise (determined by hearing).
GB/T4595—2000
8.2 Accommodation
Measurement For all accommodation cabins, at least one cabin per deck with the highest noise level should be measured in octave bands. In sleeping rooms and infirmaries, measurements should be taken at the center of the cabin. Inside the room, especially at the position near the head of a person sitting or lying down. If there is a significant difference in noise level, additional measurements should be made at these positions. 8.3 Mechanical Locations
Noise measurements shall be made at all important work places and places that are visited during routine inspection, adjustment and maintenance, as well as places where inlets and outlets are usually used. Special attention shall be paid to important places for telephone rooms, audio communications and sound signals. In addition, noise measurements shall be made at a distance of about 1m from the main engine and any machine or equipment that generates characteristic noise. Usually, noise measurements shall not be made within 1m of the measuring point from the main engine in operation, air inlet, mid-panel, bulkhead or other large surface. If measurements must be made, they shall be made at the mid-position between the machine and the nearest reflecting surface. At least two places where the maximum A-weighted sound pressure level is measured shall be measured with multiple ranges. In places such as large main engines and engine rooms, the A-weighted sound pressure level values measured point by point at the above-mentioned spacing positions will not vary greatly. In order to avoid a large number of meaningless measurements and records, it is not necessary to record at each location. Only those places with representative compensation and maximum sound pressure levels shall be fully measured and recorded. At least four points on each deck shall be measured and recorded. 8.4 Watch places
Measurements shall be made at places where speech communication and signal clarity are important. Measurements shall be made on the leeward side of the ship on both wings of the bridge. If there is a significant difference in the noise level inside the cabin as mentioned above, additional measurements shall be made at this point. Additional measurements shall be made at all normal working places (such as cargo holds and deck areas). Measurements shall be made at all places where personnel may be exposed to high noise levels. For reasons of navigation and safety, where speech clarity is important, octave band measurements shall be made. B.5 Entertainment places
Any place that provides entertainment as a day and has high noise levels after preliminary investigation shall be additionally measured. 9 Measurement report
Report all test results, including the referenced standard and related details as follows: a) Nature of test:
h) Ship status, ship main engine parameters, main engine power and main engine speed during test, and setting position of adjustable pitch propeller or vertical wing propeller:
c) Auxiliary equipment and their operating status; d) Ship loading:
e) Test location, water depth below the bottom of the ship and meteorological conditions, wind and sea conditions; Measurement equipment:
) Measurement Name and address of the person to be notified,
h) Microphone location:
\Equivalent continuous A-weighted sound pressure level 1
) If necessary, give the peak C-weighted sound pressure level:) Noise spectrum:
1) If required, give the basic results of noise exposure such as 24h equivalent continuous sound pressure level and calculation:) Existence of noise or impulse characteristic noise:) Instructions on which windows and doors are opened,
n) Indicate the relevant noise sources on board: P) The main noise measures to be applied on board.
bzsos.comGB/T 4595—2000
Appendix A
(Indicative Appendix)
Catalogue
: 1/JMO168 (Resolution Noise Level Standard for Ships)GB/T 4595—2000 Appendix A (Reminder Appendix) Reference List: 1/JMO168 (Resolution Noise Level Standard for Ships)GB/T 4595—2000 Appendix A (Reminder Appendix) Reference List: 1/JMO168 (Resolution Noise Level Standard for Ships)
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