JB/T 9953-1999 Method for measuring noise (pressure) level of woodworking machine tools
Some standard content:
IC5 7.120.01
Machinery Industry Standard of the People's Republic of China
JB/T9953-1999
Woodworking Machine Tools
Noise (Pressure) Level
Measurement Method
1999-05-14 Issued
National Bureau of Machinery Industry
2000-01-01 Implementation
JBT9953-1999
This standard is a revision of ZBJ65015-89 "Measurement Method of Noise (Pressure) Level of Woodworking Machine Tools". During the revision, only editorial changes were made according to relevant regulations.
This standard shall be effective from the date of implementation of HJ6501S-89. Appendix A of this standard is the standard's additional requirements.
Appendix B of this standard is an additional appendix.www.bzxz.net
This standard is proposed by the National Standardization Technical Committee for Machine Tools and Tools and is under the jurisdiction of the State Machine Tool Research Institute. The responsible unit for this standard is the State Woodworking Machine Research Institute. This standard was first issued on March 30, 198. Scope
Machinery Industry Standard of the People's Republic of China
Noise and sound pressure level of woodworking machine tools
Measurement method
JD/T99531999
1650159
This standard specifies the measuring instruments, environment, machine tool installation and measurement point settings for measuring noise (pressure) level of woodworking machine tools. This standard is applicable to the measurement of noise and sound (pressure) level of various woodworking machine tools. Referenced standards
The texts contained in the following standards are cited in this standard and constitute the provisions of this standard. The versions shown are valid when the standard is published. All standards will be generally agreed upon. The parties using the standards should explore the possibility of using the latest versions of the following standards: 3.1 Type I grade specified in GB/T 3785-1983 should be used for the 1/1 and 1/3 octave band filters used for sound and vibration analysis. 3.2 The 1/1 and 13 octave band filters used should comply with the requirements of 3241. 3.1 Recorders and sound level calibrators should be calibrated regularly in accordance with relevant national regulations. 3.4 Before and after the measurement, the entire measuring system including the microphone and the extension cable should be calibrated with an accurate calibration solution better than ±0.5dB. Before and after the measurement, if the difference between the two calibrations is more than 1, the measurement is invalid. 4.1 The measurement should be carried out in a wide, flat outdoor or indoor room. The surface of the measuring site must be a reflective surface. 4.2 When measuring indoors, the distance between the measuring machine and the surrounding walls should be greater than 2 meters (small protruding parts that do not affect the measurement, such as hand wheels and handles, can be omitted). There should be no large reflective surfaces and obstacles except the ground within this range. 1.3 When measuring outdoors, the ground (reflective surface) should be as far as possible. It can be concrete or bottle ground, or it can be land. The reflection surface should be larger than the projection of the rectangular center plane envelope on it. There should be no other large reflections and obstacles within 2m of the surface of the four wheels of the machine tool. 4.4 When measuring outside, the sensor should be equipped with a wind wing. When the wind speed exceeds 6m (equivalent to level 4 wind), the measurement should not be carried out. 4.5 The measurement is carried out in a safe environment. The background noise (A noise) at each measuring point should be greater than the corresponding internal (exclusion) level of the machine tool under test. If the requirements cannot be met, when the difference between the two values is 6-10d(A), the measured value should be compensated for the influence of sliding noise, and the calculation channel should be carefully determined according to the table.
National Machinery Industry Bureau 1999-05-14 Approved 2000-01-01 Implementation
J/T9953—1999
Topic: Noise (pressure level) of machine tool during operation; the maximum value of the test is within the range of the user (user) allowed by the test. Except for the general noise level of the test site, the measured value shall be adjusted according to the influence of the environment on the measured value. 4.7 If 4.1 is met, the K value shall be adjusted. -
If the indoor test site pool is very large, the ratio of the volume V to the area of the rectangular envelope of the measured machine is greater than or equal to 320m, the value adjustment is generally not made. The situation where the K value is not corrected should be stated in the test report. 4. The sound absorption test of the product under load is not corrected. 5. Installation and operation of machine tools
5. The machine tool should be corrected according to the product instruction manual. If the machine tool is installed under normal use conditions and fails to meet the requirements, the measurement report shall state the installation conditions during the measurement.
5.2 The installation of the tool shall comply with the requirements of the relevant technical documents. 5.3 The machine tool and auxiliary equipment shall be tested at 15m in normal, continuous and stable operation. 5.4 The operating conditions when no-load are as follows:
After the specified tool is installed, the machine tool shall be tested at its maximum speed: 1) For machines that can be installed with multiple tools, the tool and speed that produce the maximum noise shall be tested; 2) The adjustable parts shall be in the specified common positions. 5.5 When the machine tool is tested under load, its operating conditions such as load, speed, test piece material, tool, operation cycle, etc. shall comply with the relevant standards.
5.6 All safety devices and noise reduction equipment shall be stated in the measurement report. 6 Measurement items
6.1 Potential measurement items under no-load condition:
a) A level at each measuring point of the machine tool;
b) A level on the maximum noise level of the machine tool; when necessary, measure the A level at the selected position. 6.2 Potential measurement items under load condition:
a) Equivalent continuous A level at the back of the camera; b) Equivalent continuous A level at the no-load noise position of the machine tool. 6.3 According to the needs, use 1/1 or 1/2 octave band filter to measure the frequency level of each point. The frequency range of 1/2 octave band measurement is 63~8000m/s. The frequency range of 1/3 octave band measurement is 63~100M/s.2 Measurement point position
JB/T9953-[999
7. "The position of the measuring points around the machine end is determined as required. The vertical distance between the measuring mark and the surface of the measured machine is 1m, and the height from the ground is 1.5m. The length of the machine, m:, the quality of the machine, m:, the length of the ring, m+, m; h=
4+, m: t=L,+), m
" The position of the points around the machine bed
7.2 The maximum water radius specified in 7. " is located at the same position of the machine tool, that is, the maximum A sound level on the line shown in the overhead view, 7.3 The measuring height of the operator
1) Typical operation posture: 1.5m: b: 0.8m above the half surface of the machine. 7.4 When the operator is in the position of the head, the microphone is about 0.1m above the operator's head, and the position of the microphone should be on the effective path of the operator. 7.5 If the operator is working in a certain position, the measurement should be carried out in the position with the most noise. The position should be on the effective path of the operator.
8 Measurement method
8! Use the A-weighted network of the sound level meter to measure the sound pressure level of each frequency band using 1/1 or 13 octave frequency continuous technology. 3.2 The provisions of 72 can be made for the machine under test. Find the position affected by the most noise and report the measurement result. B.3 When measuring load noise, use an integrating sound level meter to measure the equivalent continuous A-level. B.4 Use a self-propelled sound level meter. The transmitter should point to the sound source. Figure 5 Dynamic characteristics of the sound level meter. Take the "slow" gear. The reading is taken as the value of the indicator. 9.6 When measuring, the distance between the measuring display and the transmitter is greater than 0.5m, and the test wire is used as much as possible. 9 Calculation of average sound level
IB/T9953—1999
9. Calculate the semi-average A sound level at the 9 measuring points, i.e. the measuring points specified in 7.1 to 7.2. If the noise level is too high, the position specified in 7.1 is selected, and the semi-average A sound level is calculated at B measuring points. When the difference between the maximum and minimum sound levels at each measuring point is less than or equal to 5dBA), calculate according to formula (1): ErA
Where: - average A sound level, dB(A):
(LPA-K)-
the A level measured at the th point, dB(A): X: the background noise correction value at the th point, dB(A)K compensation value, dB( A):
piece - measuring point teaching,
9.3 When the difference between the maximum and minimum A levels of each measuring point is greater than 5UB [A), calculate according to formula (2): Lua = 101g-
jo(IprK)
9.4 Combined with Article 4.7, when no value correction is made, try (1) or (2) respectively: E
A=10lg
10 measurement report
M100.l(Lpa.-Kr)
The form of the test report and the internal structure can be found in Appendix B (Suggested Appendix). The tester can add columns to explain the situation according to the test situation (such as cutting status).
AI (precision environment correction K, can be connected to the formula (AI calculation
Test: 1-room sound absorption, m;
JB./9953-1999
Appendix A
【Standard Yin Record】
Determination of environmental correction value, K, =J0le(l1
The area of the enveloping surface of the rectangular hexahedron of the bed, m. K can be obtained:
,-1 iglI- -
A2 The average sound absorption coefficient of the room and the sound absorption coefficient A can be determined by Table A1: After combustion, the room absorption coefficient is calculated by formula (A2):
In the formula: r
The approximate value of the average sound absorption coefficient of the room is shown in Table A1:
The average sound absorption coefficient of the room is calculated by the formula (A2):
The total area of the site (surface, large ceiling: Add m) The approximate value of the average sound absorption coefficient of the room is shown in Table A1
The average sound absorption coefficient
The air flow of the light wall made of condensation, plaster, and fire bricks According to the empty room of the house, the cabinet-shaped machine room, the rectangular workshop has a house and the quality is separated, the north is more shaped like a mechanical workshop or a speed-resistant machine room, there is only one house, and there is no more sound-absorbing material in the acoustics! For example, some sound-absorbing ceiling cabinets or drawers are covered by the machine. There is a large amount of sound-absorbing material on the ground. The area of the rectangular body of the machine tool (excluding the ground) is S (A3) calculated by the electric method = 4 (4) can be recorded by the method of 4. The value of K must be Less than or equal to 4.8DA), that is, 4/2 when the test is effective. Otherwise, the test site environment should be improved, such as in Shangbai, or another test site should be built. 5
Rubber wheel
JB/T9953-1999
Appendix date
[Appendix of reminder]
Woodworking machine tool sound measurement record
Table R1
Manufacture date
The size of the giant six-space body package is slightly solid||tt| |machine installation and operation state
creative instrument
production of large noise production
measurement environment description and proposed information retention small intention two measurement position and limit large position back to the diagram to determine the conclusion
motor yield
plan the maximum location
short envelope area and area 5
motor speed
disassembly group
product unit
JB/T9953—1999
Table B1 (end:
frequency medical production verification
measurement and time
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