Some standard content:
1 Introduction
National Standard of the People's Republic of China
Measurement of underwater noise
GB 5265-B5
1.1 This standard specifies the conditions and methods for measuring underwater noise so that the measured data can be compared and contrasted. 1.2 Scope of application and application of this standard: 1.2.1 This standard is applicable to underwater noise measurement in deep oceans, shallow continental shelves, ports and bays. Note: Underwater sound measurement in inland rivers, moorings, etc. can also refer to this standard. 1.2.2 The applicable frequency range of this standard is: 20Hz~20kHz. 1.2.3 The results measured in accordance with the provisions of this standard can be applied to the following aspects: Provide data and analysis information for use by relevant departments (such as for underwater noise system design, underwater noise device action distance analysis and estimation, and ship underwater radiation noise measurement. h. As a marine acoustic remote sensing method, underwater noise measurement can be used to directly estimate relevant environmental parameters (such as wind speed, wave size, and the magnitude of submarine earthquakes. It can also be used to monitor underwater dust and man-made noise sources such as shipping noise, marine exploration, etc.).
is used to study the physical mechanism of underwater noise generation and propagation and its integrated characteristics. c.
1.3 The names and symbols of scientific terms, acoustic quantities and single features used in this standard are in accordance with the provisions of GB3947-83 "Acoustic Terms" and GB3102.7-82 "Scientific Quantities and Units". 2 Definitions
2.1 Marine noise
Noise radiated by various noise sources in the ocean and propagated in it. Note: Ocean noise generally includes three parts: natural noise caused by wind, waves, currents, groundwater, thermal agitation of water molecules, ice, rain, etc. in the ocean environment; noise caused by underwater objects (marine biological noise); and noise caused by human activities such as shipping, marine development and exploration, port and industrial activities (artificial noise). 2.2 [Underwater] Noise Band Sound Pressure Level
The sound pressure level of underwater noise in a specified frequency band. It is expressed in decibels, dB. The bandwidth and reference sound pressure must be specified. The noise band sound pressure level can be calculated using the following formula:
Lpf = 201g
Formula: Noise band sound pressure level, dR (od full) p, -- noise sound pressure measured by a filter (or weighting network) with a certain bandwidth, Pa; -- reference sound pressure (=1μPa).
Note: The bandwidth used for the band includes linear (20Hz~20kIIz), A-weighted, 1/3 frequency octave! Bandwidth, etc. When the bandwidth is linear and A-weighted, the band level is called linear broadband sound pressure level LA level 1.
2.3 [Underwater] noise sound pressure spectrum [density] level refers to the logarithm of the ratio of the sound pressure spectrum density of the underwater noise signal at a certain frequency to the reference sound pressure spectrum density with the base 10 multiplied by 20. The unit is decibel, B.
National Bureau of Standards 1985-07-26 Issued
1986-04-01 Implementation
Noise spectrum level can be calculated by the following formula:
GB5265-85
Lps =Lpf-lolgaf.
: Lμ—[underwater] noise spectrum [density] level, dB (dBμPa/Hz) L is the frequency band sound pressure level measured by bandpass filtering with a center frequency of, dB (0dB△1μPa) Af—effective bandwidth of bandpass filter, Hz. Note: The noise level of underwater sound is equivalent to [power] level. 2.4 Interference noise
Disturbance caused by various reasons during measurement that affects the measurement. (2)
Note: The main sources of noise are the electrical noise of the oxygen hydrophone instrument system, the inductive interference caused by poor grounding and shielding, the system noise caused by the water flow excitation and the vibration of the hydrophone acoustic system structure in the water, the cable movement and other water dynamic effects.
2.5 Hydrophone equivalent noise pressure spectrum level
is the logarithm of the ratio of the equivalent noise pressure spectrum of the hydrophone to its reference value multiplied by 20 with a base of 10. The unit is decibel, dB (0 to 1μPa/yHz):
Note: The effective noise level of the hydrophone is the flat and straight line caused by the main axis of the hydrophone, which makes the hydrophone produce non-open circuit current ≤1 Hz noise method is used to measure the noise level. ② The test method of the equivalent sound pressure spectrum level of the hydrophone is in accordance with Appendix B of GB4128-84 "Standard Hydrophone". 2.6 Wenz noise spectrum level lower limit
Wenz. Spectrum level diagram: (i gives the lowest limit spectrum level of the measured ocean noise. Juice: Wenz spectrum level is a summary of deep-sea measurement and is widely used. 3 Quantities to be measured
a. Noise band sound pressure level Lp/:
b, noise sound pressure spectrum [density] level Lps. Standard: According to needs, it is also possible to measure and store the instantaneous value of the noise response sound pressure, and detect Various types of noise such as pulse noise, non-busy steady-state noise, etc.
4 Measuring equipment
The measuring equipment should be able to obtain the quantities to be measured as specified in this standard. Save the original data samples for laboratory replacement and further analysis. Therefore, the basic measuring equipment should generally have the following parts: Acoustic transducer system:
Measurement amplification system
Spectrum analysis system (including display and recording of analysis results) c
d, data storage system,
e. Other systems: including monitoring system, processing for special needs (such as correlation, statistics, etc.) System. 4.2 Measurement transducer system
4.2.1 Measurement hydrophone
Requirements: High sensitivity and low noise. Within the measurement frequency range, the non-uniformity of its field sensitivity should be less than ±2dB. Horizontal directivity: below 20kHz, the deviation of its directivity diagram from the ideal omnidirectional diagram should be less than ±2dB, and vertical directivity: below 20kHz, the -3dB beam width should be greater than 60. Other electroacoustic properties should comply with the relevant provisions of GB4128-84. 4.2.2 Structure and layout of acoustic system
GB526585||tt ||The structure and layout of the acoustic system should consider the following points: a. The support structure should not cause resonance in the water flow, affect the impact field and form a sound barrier effect; b. Soft and thin cables should be used for signal transmission: The fastening of the hydrophone should be equipped with anti-finger protection, and a deflector can also be added. e.
The front noise interference can be estimated during measurement. This standard recommends the use of a relatively simple sound measurement system that is more effective in resisting the low-frequency self-noise of the flow, see Appendix A.
4.3 Measurement and amplification system
The measurement and amplification system can use a sound level meter or other measuring instruments (such as a measuring amplifier). Its performance should meet the requirements of Type 2 and above specified in GH3785-83 "Electroacoustic Performance and Test Methods of Level Meters"1. 4.4 Spectrum Analysis System
4.4.1 Spectrum Analysis
The performance of the bandpass filter used in spectrum analysis shall comply with the provisions of GB3241-82 "1/1 and 1/3 octave filters for sound and vibration analysis". Other types of spectrum analysis methods (such as FF, etc.) may also be used, but the relevant performance of the instruments and equipment used should be explained.
4.4.2 Display and Recording
The display can be an analog method or a digital method. The displayed quantity must be the root mean square value of the measured noise time process signal, and the value should be expressed in dB units.
When using a sound level recorder or an electric meter to indicate the reading, the performance of the instrument indication part should meet the requirements of GB3785-83. In addition, it is recommended that the instrument should be equipped with a time constant of 1 to 100 s. When using a digital recorder, both linear and exponential averaging modes can be used. The averaging time for the linear mode of the digital filter should be 0.1100 s (select as needed). For FFT analysis, the cumulative number should be greater than 100. The exponential mode should be selected based on the variance less than 1dB and 68% confidence level.
4.5 Data storage
According to the actual situation, various types of tape recorders and other data storage devices can be used. Note: (D Due to different requirements for noise measurement, the 20Hx~20kHz frequency band can be recorded in segments. For the low-frequency measurement, if necessary, the recording modulation recording method can be used
② The performance and interface of digital recorders, etc. should meet the relevant requirements. 4.6 Calibration and verification
All measuring equipment should be calibrated and verified regularly in accordance with relevant regulations. 5 Test environment
6.1 Acoustic environment
5.1.1 When using survey ships or other vessels to measure underwater noise at sea, whether the transducer system is deployed in a floating or bottom-mounted manner, the effective distance between the transducer system and the ship should be no less than 50m. When measuring in Kaigu Haicheng, when using a fixed layout, the distance between the transducer system and the shore should be no less than 1km. And it should be avoided to be deployed on or near seabed pits, reefs. If measuring in ports and bays, and there are special requirements, the layout of the transducer system should be determined according to the equipment. 5.1.2 If a ship is used for measurement, the main engine and auxiliary engine cannot be started during the measurement, and human activities that can cause impact and transmit into the water are prohibited on the ship.
3.1.3 Select the actual site environment to be measured according to the measurement objectives and requirements. The environmental conditions on the site need to be described and recorded in detail.
5.2 Reduce 1 Noise
5.2.1 Try to avoid various possible interference noise sources nearby. 5.2.2 The electrical noise of the hydrophone and the measuring instrument used shall be as low as possible. Its equivalent noise spectrum level shall be close to the lower limit of the wenz spectrum level.
GB 5265-85
5.2.3 In order to reduce the influence of background disturbance noise on the measurement, the measured results shall be corrected according to the following formula. Ltf =Lpfr K...
Formula, Lp——corrected frequency band level, dB (0dB1μFa) Lpfo—actually measured frequency band level, d (odμPa), K correction value, dB.
The noise level correction value is given in the following table, which is AL: AL= fpfo-Lp/B
Where: —Measurement system noise level, dB (0dB1Pa). aL, dB
6 Measurement
K, dB
Measurement invalid
6.1 Matters needing attention in measurement
6.1.1 When measuring, first check the test environment and all requirements to see if they meet the requirements of 5. 6.1.2 Prevent the measurement system from overloading.
6.1.3 During the measurement, the instrument power supply equipment should not interfere with the measurement (for example, use the battery supply mode). 6.1.4 During the measurement, monitoring is required (on-site monitoring or recording and recording monitoring). 6.2 Check and identify the type and form of underwater noise (3)
6.2.1 If necessary, the value measured by the timer "slow gear" can be compared with the value measured by the "spherical gear" (the time constant should meet the requirements of G3785-83). If the difference between the two is greater than 5, the noise is considered to be pulsed. 6.2.2 If necessary, a time constant greater than 100s may be used for measurement. If the deviation of the measurement indicator value swing exceeds 2dB, the noise process is considered to have a relatively obvious semi-stationary behavior. 6.3 Standard measurement period reading method
6.3.1 For the observation of broadband sound, the observation period must be more than 10 times the time constant of the measuring instrument. If the reading is indicated by an electric meter, the middle value of the pointer swing within this period is read. The minimum reading is 0.5B. The average of 10 readings is the measured value. For observations using a 1/3 octave filter, when the center frequency is below 160Hz or 160Hz, the current measurement period should be at least 30s, and when the center frequency is above 200Hz, the observation period should be at least 10s. The half-mean of 10 readings is the measured value. 6.3.2 For the measurement and recording of digital multi-frequency sound. The selection of the time constant is adapted to the analysis bandwidth B. The product of the time constant and the bandwidth B should not be less than 100.
6.4 Measurement and storage of transient noise
The measured noise process is input to the storage device from the linear amplification part of the measurement system. At the same time, the corresponding amplifier, the gain of the recording equipment and other working conditions are recorded, and the identification mark and calibration signal are added to the stored data. 6.5 Data processing!
GB 526585
6.5.1 During data processing, firstly make necessary conversions on the subsequent test data according to the characteristics of the test product system. 6.5.2 Calculate the required quantities according to formulas (1) and (2), and make corrections according to 5.2.3. 6.5.3 Using the collected noise instantaneous position samples, other required quantities (such as statistical parameters, correlation functions, noise field directivity, etc.) can be calculated and obtained.
6.6 Field environmental state measurement
While observing the noise output, the atmospheric and oceanographic host environmental parameters required for noise measurement must also be measured. The measurement methods and instruments must comply with relevant regulations. Contents to be recorded
Description of the field environment of the measurement mother|| tt||Location of the sea area (longitude, place name), meteorological situation at that time a.
Description of the layout of the acoustic system and a schematic diagram of the structure: b.
Measurement method (same as the actual station on the shore, distance from the shore)! e.
Measurement method (wired telemetry, wireless telemetry, self-recording measurement); through monitoring, record the form and subjective feelings of underwater noise in detail. The characteristics of the noise heard (such as nearly pure line spectrum e.
components, rhythmic wave distribution, etc.) should be recorded in detail and in step with the current environmental conditions. Special attention should be paid to the description of abnormal noise conditions.
Equipment system
Instruments used for measurement, including name, model, manufacturer and serial number; a.|| tt||Spectrum analysis method (digital, analog) and effective filtering bandwidth: frequency response of the instrument system;
Measurement of the sensitivity, frequency response, level and directivity of the instrument, equivalent noise pressure spectrum level, calibration date, accuracy level and other instrument system calibration methods and dates.
Study data
Linear broadband sound system level L6
A sound level LPA
Noise spectrum level Lps
Noise correction value K!
Noise sound pressure spectrum level chart:
Give identification marks to the noise instantaneous value storage data. Explain the measurement conditions and calibration parameters and curves. Environmental parameter data
Wind penetration (m/s), humidity (level) 1| |tt||Direction and flow of ocean current (kn):
Actual depth (m), temperature profile;
Ocean waves (waveform, wave direction, wave distance):
Ocean bottom geophysical record:
Rainfall record (moderate rain, shower, rain, heavy shower), record of ships and other underwater objects appearing near the measuring station. g.
Note: Based on the difference of the day of the digging dam measurement, select and record the ten parameters listed above. B. Contents of the report
Measurement period, time, location
Measured noise, LPA and corresponding environmental conditions, parameters and related instructions when measuring the hydrophone and system structure and performance: d.
Analysis and discussion on the reverse flow of the warp flow.
GB5265—85
Appendix A
Recommended structure and layout of an acoustic measurement system
(reference)
This frame-type anti-flow self-noise layout system is light and simple, and has a good effect on reducing the low-frequency self-noise of flow. Structural diagram as shown in 1--Copper 2--Soft wire: 3--Small listening device 1
4--Image wave slurry 1 5--Nylon rope; 6--Energy 7--Deflector (technical equipment): 8--Float
Additional instructions:
This standard is reviewed and approved by the National Acoustic Standardization Technical Committee. National Acoustic Standardization Technical Committee
Chairman: Ma Daxian, Vice Chairman: Wu Rensheng, Xu Weiyi, Cheng Rui This standard is proposed by Yue Acoustic Water Subcommittee. Supermarket Water Acoustic Subcommittee
Chairman: Xu Weiyi, Vice Chairman: Wei Mo. The drafter of this standard is Hang Zhuangheng.
Formula, Lp——corrected frequency band pressure level, dB (0dB1μFa) Lpfo—actual frequency band pressure level, d (odμPa), K correction value, dB.
Noise level correction value is given in the following table, table AL: AL= fpfo-Lp/B
Where: —Measurement system noise level, dB (0dB1Pa). aL, dB
6 Measurement
K, dB
Measurement invalid
6.1 Matters to be noted in measurement
6.1.1 When measuring, first check the test environment and all requirements must meet the provisions of 5. 6.1.2 Prevent the measurement system from overloading.
6.1.3 During the measurement, the power supply equipment of the instrument should not interfere with the measurement (for example, use the battery power supply mode). 6.1.4 During the measurement, monitoring must be performed (on-site monitoring or recording monitoring). 6.2 Inspection and identification of the type and form of underwater noise (3)
6.2.1 If necessary, the value measured by the "slow gear" of the time meter can be compared with the value measured by the "spherical gear" (the time constant should comply with the provisions of G3785-83). If the difference between the two is greater than 15, the noise is considered to be pulsed. 6.2.2 If necessary, a time constant greater than 100s can be used for measurement. If the deviation of the indicator value of the mouse exceeds 2dB, it is considered that the noise process has a relatively stable operation. 6.3 Standard measurement period reading method
6.3.1 For the observation of broadband sound, the observation period must be more than 10 times the time constant of the measuring instrument. If the meter indicates the reading, read the middle value of the pointer swing in this cycle. The minimum reading is 0.5B. The average of 10 readings is the measured value. When using a 1/3 octave filter for observation, when the center frequency is below 160Hz or 160H2, the current measurement period should be at least 30s. When the center frequency is above 200Hz, the observation period should be at least 10S. The half-mean of 10 readings is the measured value. 6.3.2 Measurement and recording of 1-digit multiple-inverse motion. The selection of the time constant is consistent with the analysis bandwidth B. The product of the time constant and the bandwidth B should not be less than 100.
6.4 Measurement and storage of transient noise
The measured noise process is output to the storage device from the linear amplification part of the measurement system. At the same time, the corresponding working conditions such as the gain of the amplifier and recording equipment are recorded, and identification marks and calibration signals are added to the stored data.6.5 Data processing!
GB 526585
6.5.1 During data processing, firstly make necessary conversions on the subsequent test data according to the characteristics of the test product system. 6.5.2 Calculate the required quantities according to formulas (1) and (2), and make corrections according to 5.2.3. 6.5.3 Using the collected noise instantaneous position samples, other required quantities (such as statistical parameters, correlation functions, noise field directivity, etc.) can be calculated and obtained.
6.6 Field environmental state measurement
While observing the noise output, the atmospheric and oceanographic host environmental parameters required for noise measurement must also be measured. The measurement methods and instruments must comply with relevant regulations. Contents to be recorded
Description of the field environment of the measurement mother|| tt||Location of the sea area (longitude, place name), meteorological situation at that time a.
Description of the layout of the acoustic system and a schematic diagram of the structure: b.
Measurement method (same as the actual station on the shore, distance from the shore)! e.
Measurement method (wired telemetry, wireless telemetry, self-recording measurement); through monitoring, record the form and subjective feelings of underwater noise in detail. The characteristics of the noise heard (such as nearly pure line spectrum e.
components, rhythmic wave distribution, etc.) should be recorded in detail and in step with the current environmental conditions. Special attention should be paid to the description of abnormal noise conditions.
Equipment system
Instruments used for measurement, including name, model, manufacturer and serial number; a.|| tt||Spectrum analysis method (digital, analog) and effective filtering bandwidth: frequency response of the instrument system;
Measurement of the sensitivity, frequency response, level and directivity of the instrument, equivalent noise pressure spectrum level, calibration date, accuracy level and other instrument system calibration methods and dates.
Study data
Linear broadband sound system level L6
A sound level LPA
Noise spectrum level Lps
Noise correction value K!
Noise sound pressure spectrum level chart:
Give identification marks to the noise instantaneous value storage data. Explain the measurement conditions and calibration parameters and curves. Environmental parameter data
Wind penetration (m/s), humidity (level) 1| |tt||Direction and flow of ocean current (kn):
Actual depth (m), temperature profile;
Ocean waves (waveform, wave direction, wave distance):
Ocean bottom geophysical record:bzxz.net
Rainfall record (moderate rain, shower, rain, heavy shower), record of ships and other underwater objects appearing near the measuring station. g.
Note: Based on the difference of the day of the digging dam measurement, select and record the ten parameters listed above. B. Contents of the report
Measurement period, time, location
Measured noise, LPA and corresponding environmental conditions, parameters and related instructions when measuring the hydrophone and system structure and performance: d.
Analysis and discussion on the reverse flow of the warp flow.
GB5265—85
Appendix A
Recommended structure and layout of an acoustic measurement system
(reference)
This frame-type anti-flow self-noise layout system is light and simple, and has a good effect on reducing the low-frequency self-noise of flow. Structural diagram as shown in 1--Copper 2--Soft wire: 3--Small listening device 1
4--Image wave slurry 1 5--Nylon rope; 6--Energy 7--Deflector (technical equipment): 8--Float
Additional instructions:
This standard is reviewed and approved by the National Acoustic Standardization Technical Committee. National Acoustic Standardization Technical Committee
Chairman: Ma Daxian, Vice Chairman: Wu Rensheng, Xu Weiyi, Cheng Rui This standard is proposed by Yue Acoustic Water Subcommittee. Supermarket Water Acoustic Subcommittee
Chairman: Xu Weiyi, Vice Chairman: Wei Mo. The drafter of this standard is Hang Zhuangheng.
Formula, Lp——corrected frequency band pressure level, dB (0dB1μFa) Lpfo—actual frequency band pressure level, d (odμPa), K correction value, dB.
Noise level correction value is given in the following table, table AL: AL= fpfo-Lp/B
Where: —Measurement system noise level, dB (0dB1Pa). aL, dB
6 Measurement
K, dB
Measurement invalid
6.1 Matters to be noted in measurement
6.1.1 When measuring, first check the test environment and all requirements must meet the provisions of 5. 6.1.2 Prevent the measurement system from overloading.
6.1.3 During the measurement, the power supply equipment of the instrument should not interfere with the measurement (for example, use the battery power supply mode). 6.1.4 During the measurement, monitoring must be performed (on-site monitoring or recording monitoring). 6.2 Inspection and identification of the type and form of underwater noise (3)
6.2.1 If necessary, the value measured by the "slow gear" of the time meter can be compared with the value measured by the "spherical gear" (the time constant should comply with the provisions of G3785-83). If the difference between the two is greater than 15, the noise is considered to be pulsed. 6.2.2 If necessary, a time constant greater than 100s can be used for measurement. If the deviation of the indicator value of the mouse exceeds 2dB, it is considered that the noise process has a relatively stable operation. 6.3 Standard measurement period reading method
6.3.1 For the observation of broadband sound, the observation period must be more than 10 times the time constant of the measuring instrument. If the meter indicates the reading, read the middle value of the pointer swing in this cycle. The minimum reading is 0.5B. The average of 10 readings is the measured value. When using a 1/3 octave filter for observation, when the center frequency is below 160Hz or 160H2, the current measurement period should be at least 30s. When the center frequency is above 200Hz, the observation period should be at least 10S. The half-mean of 10 readings is the measured value. 6.3.2 Measurement and recording of 1-digit multiple-inverse motion. The selection of the time constant is consistent with the analysis bandwidth B. The product of the time constant and the bandwidth B should not be less than 100.
6.4 Measurement and storage of transient noise
The measured noise process is output to the storage device from the linear amplification part of the measurement system. At the same time, the corresponding working conditions such as the gain of the amplifier and recording equipment are recorded, and identification marks and calibration signals are added to the stored data.6.5 Data processing!
GB 526585
6.5.1 During data processing, firstly make necessary conversions on the subsequent test data according to the characteristics of the test product system. 6.5.2 Calculate the required quantities according to formulas (1) and (2), and make corrections according to 5.2.3. 6.5.3 Using the collected noise instantaneous position samples, other required quantities (such as statistical parameters, correlation functions, noise field directivity, etc.) can be calculated and obtained.
6.6 Field environmental state measurement
While observing the noise output, the atmospheric and oceanographic host environmental parameters required for noise measurement must also be measured. The measurement methods and instruments must comply with relevant regulations. Contents to be recorded
Description of the field environment of the measurement mother|| tt||Location of the sea area (longitude, place name), meteorological situation at that time a.
Description of the layout of the acoustic system and a schematic diagram of the structure: b.
Measurement method (same as the actual station on the shore, distance from the shore)! e.
Measurement method (wired telemetry, wireless telemetry, self-recording measurement); through monitoring, record the form and subjective feelings of underwater noise in detail. The characteristics of the noise heard (such as nearly pure line spectrum e.
components, rhythmic wave distribution, etc.) should be recorded in detail and in step with the current environmental conditions. Special attention should be paid to the description of abnormal noise conditions.
Equipment system
Instruments used for measurement, including name, model, manufacturer and serial number; a.|| tt||Spectrum analysis method (digital, analog) and effective filtering bandwidth: frequency response of the instrument system;
Measurement of the sensitivity, frequency response, level and directivity of the instrument, equivalent noise pressure spectrum level, calibration date, accuracy level and other instrument system calibration methods and dates.
Study data
Linear broadband sound system level L6
A sound level LPA
Noise spectrum level Lps
Noise correction value K!
Noise sound pressure spectrum level chart:
Give identification marks to the noise instantaneous value storage data. Explain the measurement conditions and calibration parameters and curves. Environmental parameter data
Wind penetration (m/s), humidity (level) 1| |tt||Direction and flow of ocean current (kn):
Actual depth (m), temperature profile;
Ocean waves (waveform, wave direction, wave distance):
Ocean bottom geophysical record:
Rainfall record (moderate rain, shower, rain, heavy shower), record of ships and other underwater objects appearing near the measuring station. g.
Note: Based on the difference of the day of the digging dam measurement, select and record the ten parameters listed above. B. Contents of the report
Measurement period, time, location
Measured noise, LPA and corresponding environmental conditions, parameters and related instructions when measuring the hydrophone and system structure and performance: d.
Analysis and discussion on the reverse flow of the warp flow.
GB5265—85
Appendix A
Recommended structure and layout of an acoustic measurement system
(reference)
This frame-type anti-flow self-noise layout system is light and simple, and has a good effect on reducing the low-frequency self-noise of flow. Structural diagram as shown in 1--Copper 2--Soft wire: 3--Small listening device 1
4--Image wave slurry 1 5--Nylon rope; 6--Energy 7--Deflector (technical equipment): 8--Float
Additional instructions:
This standard is reviewed and approved by the National Acoustic Standardization Technical Committee. National Acoustic Standardization Technical Committee
Chairman: Ma Daxian, Vice Chairman: Wu Rensheng, Xu Weiyi, Cheng Rui This standard is proposed by Yue Acoustic Water Subcommittee. Supermarket Water Acoustic Subcommittee
Chairman: Xu Weiyi, Vice Chairman: Wei Mo. The drafter of this standard is Hang Zhuangheng.6. On-site environmental state measurement
While observing the noise, the atmospheric and oceanographic environmental parameters required for noise measurement must also be measured. The measurement methods and instruments must comply with relevant regulations. Contents to be recorded
Description of the measurement site environment
Location of the sea area (longitude, place name), meteorological situation at the time a.
Description of the acoustic system layout and structural sketch: b.
Measurement method (shore station, distance from shore)! e.
Measurement method (wired telemetry, wireless telemetry, self-recording measurement); through monitoring, record the form and subjective feelings of underwater noise in detail. The characteristics of the noise heard (such as nearly pure line spectrum e.
components, rhythmic wave distribution, etc.) should be recorded in detail and in accordance with the current environmental conditions. Special attention should be paid to the description of abnormal noise conditions.
Instrument system
Instruments used for measurement, including name, model, manufacturer and serial number; a.
Spectrum analysis method (digital, analog) and effective filtering bandwidth: frequency response of instrument system;
Measurement sensitivity, frequency response, level and directness of instrument, equivalent noise pressure spectrum level, calibration date, accuracy level, etc. Instrument system calibration method and date.
Output data
Linear broadband sound system level L6
A sound level LPA
Noise spectrum level Lps
Interference noise correction value K!
Noise sound pressure spectrum level chart:
Give identification marks to the noise instantaneous value storage data. Explain the measurement conditions and calibration parameters and curves. Environmental parameter data
Wind penetration (m/s), wind conditions (level) 1
Current direction, current encounter (kn):
Actual depth (m), temperature profile;
Waves (waveform, wave direction, wave distance):
Seabed geophysical data:
Rainfall records (moderate rain, showers, rain, heavy showers), records of ships and other underwater objects appearing near the measuring station. g.
Note: Based on the difference in the days of the digging dam measurement, select and record the ten parameters listed above. B. Contents of the report
Date, time, and location of the measurement
Measured noise, LPA, and the corresponding environmental conditions, parameters, and related instructions when measuring the hydrophone and system structure and performance: d.
Analysis and discussion of the reverse channel flow of the measurement volume.
GB5265—85
Appendix A
Recommended structure and layout of an acoustic measurement system
(reference)
This frame-type anti-flow self-noise layout system is light and simple, and has a good effect on reducing the low-frequency self-noise of flow. Structural diagram as shown in 1--Copper 2--Soft wire: 3--Small listening device 1
4--Image wave slurry 1 5--Nylon rope; 6--Energy 7--Deflector (technical equipment): 8--Float
Additional instructions:
This standard is reviewed and approved by the National Acoustic Standardization Technical Committee. National Acoustic Standardization Technical Committee
Chairman: Ma Daxian, Vice Chairman: Wu Rensheng, Xu Weiyi, Cheng Rui This standard is proposed by Yue Acoustic Water Subcommittee. Supermarket Water Acoustic Subcommittee
Chairman: Xu Weiyi, Vice Chairman: Wei Mo. The drafter of this standard is Hang Zhuangheng.6. On-site environmental state measurement
While observing the noise, the atmospheric and oceanographic environmental parameters required for noise measurement must also be measured. The measurement methods and instruments must comply with relevant regulations. Contents to be recorded
Description of the measurement site environment
Location of the sea area (longitude, place name), meteorological situation at the time a.
Description of the acoustic system layout and structural sketch: b.
Measurement method (shore station, distance from shore)! e.
Measurement method (wired telemetry, wireless telemetry, self-recording measurement); through monitoring, record the form and subjective feelings of underwater noise in detail. The characteristics of the noise heard (such as nearly pure line spectrum e.
components, rhythmic wave distribution, etc.) should be recorded in detail and in accordance with the current environmental conditions. Special attention should be paid to the description of abnormal noise conditions.
Instrument system
Instruments used for measurement, including name, model, manufacturer and serial number; a.
Spectrum analysis method (digital, analog) and effective filtering bandwidth: frequency response of instrument system;
Measurement sensitivity, frequency response, level and directness of instrument, equivalent noise pressure spectrum level, calibration date, accuracy level, etc. Instrument system calibration method and date.
Output data
Linear broadband sound system level L6
A sound level LPA
Noise spectrum level Lps
Interference noise correction value K!
Noise sound pressure spectrum level chart:
Give identification marks to the noise instantaneous value storage data. Explain the measurement conditions and calibration parameters and curves. Environmental parameter data
Wind penetration (m/s), wind conditions (level) 1
Current direction, current encounter (kn):
Actual depth (m), temperature profile;
Waves (waveform, wave direction, wave distance):
Seabed geophysical data:
Rainfall records (moderate rain, showers, rain, heavy showers), records of ships and other underwater objects appearing near the measuring station. g.
Note: Based on the difference in the days of the digging dam measurement, select and record the ten parameters listed above. B. Contents of the report
Date, time, and location of the measurement
Measured noise, LPA, and the corresponding environmental conditions, parameters, and related instructions when measuring the hydrophone and system structure and performance: d.
Analysis and discussion of the reverse channel flow of the measurement volume.
GB5265—85
Appendix A
Recommended structure and layout of an acoustic measurement system
(reference)
This frame-type anti-flow self-noise layout system is light and simple, and has a good effect on reducing the low-frequency self-noise of flow. Structural diagram as shown in 1--Copper 2--Soft wire: 3--Small listening device 1
4--Image wave slurry 1 5--Nylon rope; 6--Energy 7--Deflector (technical equipment): 8--Float
Additional instructions:
This standard is reviewed and approved by the National Acoustic Standardization Technical Committee. National Acoustic Standardization Technical Committee
Chairman: Ma Daxian, Vice Chairman: Wu Rensheng, Xu Weiyi, Cheng Rui This standard is proposed by Yue Acoustic Water Subcommittee. Supermarket Water Acoustic Subcommittee
Chairman: Xu Weiyi, Vice Chairman: Wei Mo. The drafter of this standard is Hang Zhuangheng.
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.