This part specifies the laboratory method for measuring the impact noise of a floor slab under the floor slab by exciting it with a standard impactor. This method is applicable to the measurement of bare floor slabs as well as to the measurement of floor slabs with cladding layers. The measurement results can be used to compare the impact sound insulation performance of floor slabs and to classify them according to their impact sound insulation performance. GB/T 19889.6-2005 Acoustic buildings and building elements sound insulation measurement Part 6: Laboratory measurement of impact sound insulation of floor slabs GB/T19889.6-2005 Standard download decompression password: www.bzxz.net
This part specifies the laboratory method for measuring the impact noise of a floor slab under the floor slab by exciting it with a standard impactor. This method is applicable to the measurement of bare floor slabs as well as to the measurement of floor slabs with cladding layers. The measurement results can be used to compare the impact sound insulation performance of floor slabs and to classify them according to their impact sound insulation performance.

15 91.120,30
National Standard of the People's Republic of China
CB/T 19889.6—2005/1S0 140-6:1998 Acoustics
Sound insulation measurement in buildings and building elements
Part 6: Laboratory measurement of impact sound insulation in floors (1S0 140-6::098.11)T)
2005-09-09 Release
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Standardization Administration of China
2006-04-01 Implementationbzxz.net
Standardized Documents
Terms and Definitions
Measurement Equipment
Test Chamber
Test Procedure
Field Barrier Generation
Ear Pressure Measurement
Standardized Rate Range
Mixing Time Measurement and Sound Absorption Basis Calculation
Goods Scene Sound You Are
Precision pressure gauge
Haojin ... 19889.62305/IS0 140-6:199812
GF/T198R9 Acoustics of building components: Part 1: Laboratory test plan for lateral sound transmission; Part 3: Experimental room measurement of airborne sound of variable components; Part 4: Field measurement of airborne sound between rooms; Part 5: Laboratory measurement of airborne sound of exterior wall components; Part 6: Laboratory measurement of slab sound; Part 7: Field measurement of slab sound! GB/T 19889.6--2005/7S0140-6:1998 Part 8: Single ring connection version of the laboratory sound quality measurement; this part is the part of G/18.
This part adopts the 5-6th board of the laboratory standard for the measurement of the average building parts before the test! .
This part of the national standard is based on the 1S11-E:S98. This part is a standard for the material quality of the laboratory. The core of the medicine is the requirements of the A, and the requirements of the E are signed by the Chinese Academy of Sciences. This part is the National Acoustic Standardization Technical Committee (special drafting unit of this part, the Institute of Building Science, the Chinese Academy of Sciences, and the Institute of Research: This section is drafted by: Yuan Hua, Gong Ji Yu, Guoqiang Lu Yadong, Lin Jie. m
! Scope
GB/T19889.6—2005/1SO 140-6;1998 Acoustics of buildings and building elements
Part 6: Laboratory test of impact sound insulation of slabs This part specifies the test method for measuring the impact sound insulation of slabs under magnetic field using standard instrument excitation. This method is applicable to the measurement of optical floors, the measurement of scientific floors, the measurement of sound insulation performance of light floors, and the evaluation of sound insulation performance of actual buildings. Note: The performance measurement of the production network shall be in accordance with the provisions of GB/197. Note: The standard value of the laboratory measurement is determined by the provisions of GB/114-2 Normative referenced documents
The following documents are referenced in this part of G1S89 and shall become the referenced parts of this part: For any document with a date indicated, all accompanying complete documents (excluding the contents of the review) or static editions shall not be applicable to the previous part. However, the parties are encouraged to reach an agreement based on this part to confirm that the latest versions of these documents are sufficient. For any document with an undated date, the latest versions shall apply retroactively to this part.
GB/T324118S8 Frequency and fractional frequency measurement equipment (1ES1250.1955) GB/7B[S3 Paper meter, household performance test method G1517-1S94 production calibrator (C5042:98G/17181-199? Velvet meter (1F080:1S) G31988125 Acoustic effect measurement of building components required for sound measurement fee 1 mail: can be produced by the laboratory test facility requirements (IS014U-11, IDT
6B! 14889.2-2J5 Acoustics: Building design and construction - Part 1: Determination, verification and application of effective sound pressure (IS-40-21W1.IT)
13/T50121-2C05 Building evaluation standard 354:1985 Acoustic reverberation room suction measurement 3 Technical and harmonic definitions
The following terms and definitions apply to this section. 3.1
Average sound pressure level in the room averages nndpressurelevel in a mnmL
The ratio of the spatial average of the square of the pressure to the reference sound pressure, with 10 as the logarithm, unit: 1. The spatial average refers to the sound in the test space, but does not include the area of ​​the city or the area near the boundary such as the wall, because they will have a significant effect on the structure.
If the speed is measured with a continuously moving microphone, 1. Determined by formula (1): 1
GD/T 19$89.6--2005/15O 120-6:199E:
sound film unit is purchase ([a:
dangerous pressure,
one - integral and time, sheep position s,
used to use the national fixed position of the transmission to measure:. Ratio formula (now fixed: 1-10gae+area B
where:
2..P:.-.P.
indoor "root mean square value of the film of different measuring points, actual source:, after the operation of the heavy pressure level L North time L day formula (2> confirmed Beijing L= tolgt
room★The level of the measurement point is from to! .
impact sound pressure frequencyiniprasemrsoRleve
When the main standard of the tested floor is driven by a small source of excitation, the average sound pressure in the indoor environment is relatively high, single: mountain. 3.3
normative impact sound pressure levelnornimalizedimpactsnimdpressurelevelL.
control sound pressure level "plus a correction factor, the ratio of the actual sound absorption A measured by the receiver to the reference sound pressure A, with the base of: multiplied by 13, unit:, 7., calculated according to formula (4): Lf., +10l
Where;
Inquire about the center
4 Measuring equipment
The measuring equipment shall meet the requirements of the British competition
standard; The measurement can only meet the requirements specified in the attached specifications, 4
The accuracy of this grade measuring equipment shall meet the requirements of Type 0 or Type 1 source accuracy specified in GB/T4785-188 and B171511997, and in order to measure the absolute value of the main level of sound, the new sound equipment shall be calibrated in the production period before the test. The manufacturer of the old equipment shall not provide any other assistance, and the calibrator shall be calibrated in accordance with the Class 1 accuracy requirements specified in GH/1151731994. The sound equipment shall be calibrated in the field by the sound equipment that has been measured, and the industry shall make corrections before expanding the sound field. 3 times the requirements of the source of the instrument 11632411999, the time of the measuring equipment is full of 1S0) 354: 198 three regulations. Note: the main method of the program is closed by the method A. 5.1 Test arrangement
5.1 Test equipment
Laboratory equipment GB: [9339.1-2065 performance requirements 2
5.2 Test piece
GB/T13839.6—2005/150140-6: 1998 The size of the test piece is determined by the size of the test equipment in the laboratory test, and the provisions of the test system are shown in 3/1965S.20 yuan, the area of ​​the test piece is between 1%m~2. And the length of the short side of the test piece is not less than 2.3l The pump in the test bucket should be as close to the actual structure as possible. The test piece and the internal nodes should be similar to the original connection type and sealing conditions to be reserved. The installation conditions should be described in the damage test report. The impact sound of the floor is related to the connection between the barrier and the solid edge. In order to accurately express the influence of the installation, it is recommended to measure the loss factor (see Appendix 1). The sound and radiation of the cabinet should be suppressed to a negligible level. For this purpose, the long explosion test can be carried out.
6 Test procedure and calculation
6.1 Generation of sound field
Appropriate sound control device (A) is suitable for the sound control standard. The device is placed at least four different positions on the floor under test. The position is not small or not affected by the above-mentioned edge. The quality of the floor slab (such as the case of the purchase of other requirements such as the torsion exceeding the regulations and the surface layer of the slab that cannot be effectively reduced) can be placed in a more effective position. The impact chain is connected with the frame or auxiliary management. 45: The impact sound during the impact may show changes over time. When the total level is not reached at the end of the course, the test disk will be tested for ten periods of time. If the stability conditions are still not met after 5ma, then the most strict certification period should be selected. Thank you for your requirements. The measurement is carried out during the period. When measuring on the material with higher quality, the standard impact test shall meet the requirements of Appendix A. For the standard operating instruments on the floor with higher quality, see Appendix A: 6.2 Technical requirements for pressure relief
6.2.1 General
When the pressure relief level is high, a single transmitter is not required to be measured indoors. It can also be obtained by using a fixed transmitter series or a continuous or rotating transmitter. For the impactor signal, the pressure level on the back of the different microphone positions should be the half-mean value of the formula (1) 13
E.2.2 Transmission path position
The minimum distance between the two transmission positions is 0.7m:
The distance between the microphone position and the test chamber or expansion chamber is
The distance between the microphone position and the test piece is
The standard is: The maximum working volume
Fixed microphone position
There should be at least 10 microphone positions. The output is evenly distributed in the receiving room:
When using mobile microphones, the scanning light should not be less than 1! The plane that is scanned daily should be inclined so as to maximize the space that can be measured. The scanning light of any single side of the room (ratio, floor, ceiling) should not be less than 10, and the scanning duration should not be less than 5 -
5.2.3 Measurement
Fixed microphone:
Using a fixed microphone: When the microphone is empty: at least six times according to at least four sound exposure positions and at least ten sound exposures are combined to the rate
indicating that the two non-special positions and two will then be placed in the other four possible combinations. Two other microphone positions and two impactors are measured one-on-one twice.
Ultra-dynamic microphone position:
When using a dynamic microphone, measure at least once, once for each impactor position: When there are six or eight impactor positions, one or two people can be used to rotate 6.2.4 Average time
The average time between the readings and the values ​​at each fixed microphone position is: for frequencies below 490°C, this shall be less than 65°C for single-time measurements at the centre of the microphone, with an accuracy of less than 3%. When using a mobile microphone, the average time shall be less than 5°C for all scanned positions. 6.3 The range of frequencies measured shall be: 1:50°C (1:20°C) and shall include the following centre frequencies. If additional information on the low end of the range is required, use a continuous coverage transmitter with the following centre frequencies: 2:50°C (1:20°C) and include the following centre frequencies. 6. 4 Reverberation time measurement and sound absorption calculation According to the reverberation time, the Sabine formula (51 formula: 4) can be used to calculate the sound absorption. The reverberation time measurement is completed according to the provisions of ISO 354355:
A Lu volume unit (square meters)
receiving room capacity, unit is cubic meter (m
- According to the reverberation time, the unit is second (
According to the provisions of IS334, 1U85, the starting position of the strain curve rise should be about 1:1: the strain curve is calculated from the pressure level of the curve. The strain line segment range used should not be less than 2, but also not too large so that the multiple segments of the observer cannot be approximated as a straight line. The lower end of the decay curve segment used should be at least 1CB
The reverberation height reduction unit of each frequency band At least six measurements shall be made. For each case, one transmitter position and two router positions shall be used, with two readings at each transmitter. A mobile transmitter meeting the requirements of 3.2 may be used, but its sweep time shall not be less than 0.865 m/s. To ensure that the measured noise level in the receiving room is not affected by external factors such as the sound of the receiving system, the single-noise level shall be measured. The receiving system shall be checked with a single transmitter instead of a microphone. Note that the air noise generated by the transmitter and transmitted to the receiving room shall not affect the sound pressure level of the receiving room. The total level after the sound level monitoring is at least B lower than the sound pressure level of the signal and the system operation is superimposed. If the sound pressure difference is less than 15 B, but greater than 33, the corrected signal output level is calculated as follows: 1olg+3-\ -1n\-**dh
wherein,
is the times of the correction range, the unit is decibel (dH):. --The total pressure level of the signal and the back limit control room, the unit is decibel (dB); .....
L back sound pressure level. The unit is decibel (dB) GB/T19889.6-2005/[50140-6;1998 If the difference in sound pressure levels in a band is less than or equal to 6, the static correction value 1.3cB is used for correction when measuring cB. At this time, the test report should give the tropical. The original limit value of the ratio is shown in Chapter 7. The precision
measurement panel should have sufficient correction points, and should be selected to determine its weight (H/T9829.3·2010=). It is recommended to calibrate in a fashionable way: when the measurement point changes, the instrument equipment should be calibrated. Activity: The required system. GB/19883.2-20G.8 Result Expression
In the test report of the test piece, the standardized description of the measured oxygen frequency should be given in the form of a table and curve. The value should be corrected to one decimal place. When making a standardized control pressure value curve for the numerical period rate scale, the following size should be used:
5mm represents--3 Times;
·20mTable 3 The industry recommends using the format in Appendix E. This concise form of the test report lists all the important information about the subject, the test procedure and the test system.
If it is also necessary to test the standardized control sound level in the octave band, the respective values ​​should be calculated from the effectiveness values ​​of two 1/3 times the frequency band according to the following formula:
710s.1/) dB
u.=1n'x(>
Measurement area, calculate the arithmetic mean of the measurement results. 9 Test report
The test report shall include the following contents:
) The test basis is B/T:
The name and address of the testing laboratory:
The name and product number of the test sample manufacturer: The name and address of the entrusting unit or entrusting person (customer): d
Test date:
Description of the test sample: Draw the section as required), note the installation time of the test piece, the size, thickness, surface roughness, composition and expansion of the test piece, and explain the installer of the sample (test structure or manufacturer); The volume of the receiving room;
The pressure and viscosity of the test air <If it is the same as the test Related): Visit the test sample for all measured results to the residual impact pressure of the rainbow pool.; j?
test type only needs to be stated; due to the influence of background sound components, when a certain sound level cannot be measured, the library shall give the actual impact sound pressure in the form of Lk>
. The measurement limit is: "Comparison", if the measurement results are given in the form of Appendix B, it is advisable to explain as clearly as possible the lateral sound transmission measurement or the results including the following:) The total loss factor of all measured frequencies is given in the form of a loss factor and/or curve (see Appendix, according to 1, (> curve calculation single value evaluation rat see:K/1=01212005, it is clear that the single value evaluations in the two reports were calculated based on the measurement results of the thermal laboratory.
G/19889.6—2005/SO140-6.199E The equipment for the improvement of the equipment meets the requirements of the construction chapter, and the requirements of the standard are as follows: the control device should have five ones, then in a straight line: the distance between the center line of the two adjacent chains needs to be monitored (1+)m, the center line of the control device and the adjacent chain needs to be not less than ICm, and the feet should be equipped with vibration isolation. The effective mass of each support is 4 times the height of the virtual free force under the impact, and the allowable recognition value is 1%: the friction force of the hammer is small when the ticket is considered to be more effective. The impact speed of the hammer should be within the range of 1 month, and the vertical speed should be within the range of 12 (10 12): the cost should be 1.=2)m/if the quality of the hammer can be guaranteed At (6), the corresponding quality product is related to the small difference in speed. The error of the state speed can be +.235
. The lower grid of the chain should be multiplied by ten test surfaces. The error is +0.5": with the pressure surface control out of the vertical (3!2m, the rust-drawing surface is made of mail, and the shape is a half-price (500+100)> spherical blood. Whether this requirement is met can be tested according to the following force method: a: The measured scene is at least two edges that are tangent to the center point of the selected value and are positively shifted or measured on the mountain surface. If the measurement station is located at Guangyi A, the surface of the inner area of ​​the customer withdrawal surface meets the requirements of the warehouse. The line of A.1 shows a half-degree variation of 500 mouths. The distance between the two lines should be 4: The curve of Um6In is usually within the domestic limit of the difference between the customer's extremes. The measurement accuracy should be at least 0.0lm. 2
Return distance
Note: The center of gravity is also selected as follows: m South A.1 The tolerance limit of the curvature of the hammer head
) The mountain can be broken in a point-by-point manner on the circle of mm. The control device is driven by a number of workers. The average time between the control devices is 10023)tms.
When changing the gears, it should be less than ten meters. When using the standard control device, there is a soft rock or an uneven surface. When changing the gears, the impact rate is less than 4 meters below the surface.
5/9899.6—2005/8)14C-61998
There are standard contact finger adjustment and food test to see whether the system meets the requirements of the stable work. The reverse thrower should be able to be used on any active surface of the test surface. If the reverse test table is paved with special surface size changes, it is very different from the key. When the lower height does not reach the required 10Ⅲ, that is, when the hammer falls, the cushion layer can be placed on the support foot to ensure the exact drop height. Also, the impactor should be regularly checked under standard conditions to see if it meets the requirements. It should be noted that the single type meets the requirements! The water solution meets the requirements, and the test surface of 1" is avoided. For the impact energy that is not accurate: the effect only needs to be checked once, including the distance between the hammers, the support of the hammer, the diameter of the hammer, the weight of the hammer (except for the repaired auxiliary hammer) and the lifting time and the maximum possible drop height of the hammer. The speed, the diameter and curvature of the hammer head, the direction of fall and the time between the hammers should be checked regularly. The width of the sound transmission should not exceed 2% of the normal value. GB/T19889.6-2005/ISO140-6:1998 Appendix H
(Informative Appendix)
The amount of sound transmission in the side direction
and the state of lateral transmission of the impact sound should be checked. The average surface velocity level of the sample tested (, the unit is positive, x+-x
I. = Iigl
Wu Zhong:
The method of treating different surface conditions of an object is to calculate the surface lightness value; the level of the dynamic speed (=_0-m/s!
Xu: In architectural acoustics, the benchmark maze is also estimated using 3×1℃?m, so the industry audit degree in formula 1> can be explained, 3.
If the new transducer is attached to the surface of the test object, its quality should be lower than the surface resistance. If the critical shadow rate of the test piece or the intermediate component is lower than the measured lock rate range, the area is S, and the sound power W in the receiving room of the first structure is estimated by the formula:
W,=nes,n
The average value of the normal surface resistance is: T
The radiation effect is above the critical point
The sustained resistance of air.
-( B 2 2
Receive the average sound pressure level radiated by the lateral components. According to the average surface vibration intensity, it is calculated as follows: .T+:olg
If the reference vibration intensity is 11ir:/s, then C=54eH. If the reference vibration intensity is 35m/%, then C=0. The combined sound pressure level Lm of all lateral components is calculated as follows: Lc = 101g(Z1n*r)
C.1 Introduction
Appendix C
(Informative Appendix)
Guidelines for low-frequency measurement
GB/T19989.6—2005/TSO140-6:199 Low frequency band [usually refers to less than 4MHz and less than 1MHz] The test room will not be equipped with the conditions of diffuse sound field. This is especially true when the test room area is between 5~1CC㎡°. In the lowest period, there will be at least one distribution in the room. General requirements. The whole room space is the original area of ​​the full range of the bottom mode. In order to reduce the isolation of the monitoring results, it is necessary to make some specific requirements for the excitation and sampling of the receiving room and the fast room:
Rooms with small volume and inappropriate dimensions are not suitable for low-frequency measurements. The dimensions of the room must have at least one direction equal to the wavelength of the lowest center frequency, and at least ten directions equal to the wavelength of the highest center frequency, so that there is enough space for sound transmission as required.
The minimum distance from the center of the room
indicates that the sound level within a quarter-wavelength increases, so the measurement range should increase linearly with the decrease of the measurement range. The minimum time for measuring H shift should be as follows: The minimum distance between each transmitter position and the room interface is
C.3 Field sampling
In order to obtain reliable data of the spatial average value of the user pressure level: The number of microphone positions should be increased: The transmitter positions should be evenly distributed in the entire available space of the test room. For moving transmitters, the sampling should be evenly distributed in the entire available space. For very low frequencies, the room center should be closer than halfway. At this time, the center of the room should be the lowest. Therefore, the microphone should be placed in the center of the room. 4 Average time
For the measurement of the average time, the average time should be increased to at least 15 times the required time for the measurement of the average time. When using a mobile microphone, the average time should not be less than 63. C.5 reverberation time
For low frequencies, the test room usually has a longer reverberation time. To avoid reverberation, the room can be arranged to absorb the normal room mode or overlap to reduce the effect of a single mode on the reverberation room. The convex panels of the room with mineral wool as the main surface are used for analysis: as well as the floating ground pole,
1) The 11+-G is misleading as 6, 2,11 The half of the line of the household is 500 degrees, the distance between the two lines should be 4: Um6In. The curve is usually within the range of the domestic specification, and the measured distance should be at least 0.0lm. 2
Distance from the center
Note: The tolerance limit of the curvature of the hammer head can also be selected as: m South A.1 The tolerance limit of the curvature of the hammer head
) The mountain can be broken into a point on the circle of mm. The average time between the control and the control is 10023)tms. The time between the control and the control should be less than ten meters. When using the standard control device with soft rock or uneven surface, the impact rate of the control device should be less than 4 meters below the surface. )14C-61998
There are standard impact finger adjustment and test whether the system meets the requirements of the stable work. The reverse thrower should be able to test the surface of any movable parts on the flat surface. If the reverse test table is not effective, the surface size of the table is very different. When the lower height of the hammer cannot reach the required 10Ⅲ, the support surface can be placed on the support foot to ensure the correct drop height. Also, the impactor should be regularly checked under the standard conditions to see if it meets the requirements. It should be noted that the single type meets the requirements! The test surface of 1" should be avoided for testing. For the impact energy that is not accurate, only one quality is required, including the distance between the hammers, the support of the hammer, the diameter of the hammer, the amount of the hammer (except for the repaired auxiliary) and the maximum possible drop height of the hammer after lifting. The speed, the diameter and curvature of the hammer head, the direction of fall and the time between the hammer and the impact should be checked regularly. The width of the whole shall not exceed 2%. GB/T19889.6-2005/ISO140-6:1998 Appendix H (Informative Appendix) The quality of the lateral sound transmission and the state of the lateral sound transmission shall be checked. The impact speed level can be confirmed by measuring the maximum receiving test piece and the lateral component surface. The average surface vibration velocity level (x+-x
I.) of the sample is given by the formula, in positive units, x+-x
I. = Iigl
Wu Zhong:
The surface vibration velocity level (=_0-m/s!
Xu: In architectural acoustics, the benchmark hysteresis is also estimated using 3×1℃?m, so the industry audit degree in formula 1> can be explained, 3.
If the new transducer is attached to the surface of the test object, its quality should be lower than the surface resistance. If the critical shadow rate of the test piece or the intermediate component is lower than the measured lock rate range, the area is S, and the sound power W in the receiving room of the first structure is estimated by the formula:
W,=nes,n
The average value of the normal surface resistance is: T
The radiation effect is above the critical point
The sustained resistance of air.
-( B 2 2
Receive the average sound pressure level radiated by the lateral components. According to the average surface vibration intensity, it is calculated as follows: .T+:olg
If the reference vibration intensity is 11ir:/s, then C=54eH. If the reference vibration intensity is 35m/%, then C=0. The combined sound pressure level Lm of all lateral components is calculated as follows: Lc = 101g(Z1n*r)
C.1 Introduction
Appendix C
(Informative Appendix)
Guidelines for low-frequency measurement
GB/T19989.6—2005/TSO140-6:199 Low-frequency band [usually refers to less than 4MHz and less than 1MHz] The test room will not meet the conditions of the scattered sound field. This is especially true when the test room area is between 5~1CC㎡°. In the lowest period, there will be at least one direction in the room that meets the general requirements. According to the full range of the bottom room mode, the entire room space produces special waves as the original area. In order to reduce the inconsistency of the measurement results, it is necessary to make some work on the excitation and sampling of the field in the receiving room and the specific requirements for the fast room:
Rooms with small volume and inappropriate dimensions are not suitable for low-frequency measurement. There is at least one direction in the room dimension that is equal to the maximum The wavelength of the center frequency band is the lowest, and the wavelength of the center frequency band is the lowest. The room has sufficient space for the required sound transmission. The minimum distance between the center and the room boundary is shown in Figure 6. The sound level increases within a quarter of the wavelength, so the measurement range increases linearly with the decrease in the measurement range. The minimum distance between each transmitter position and the room boundary is the minimum distance between each transmitter position and the room boundary. C.3 Field sampling In order to obtain reliable data of the spatial average of the user pressure level: the number of microphone positions should be increased: the transmitter positions should be evenly distributed throughout the available space in the test room. When moving the transmitter, it should be sampled evenly throughout the available space. For very low frequencies, the room center is closer than half the distance. Therefore, the microphone should be placed in the center of the room. 4. Average time
For measurements in the band, the average time should be increased to at least 15 times the average time required for the 10011 period. When using a mobile microphone, the average time should not be less than 63. C.5. Reverberation time
For low frequencies, the test room usually has a longer reverberation time. To avoid reverberation, the room can be arranged with absorption or overlap of ordinary room modes to reduce the effect of the reverberation room on the conduction of a single mode. The convex panels of the room with mineral wool are used as the surface analysis board: and the floating ground pole,
1) The composition is 11+-G, which is misleading as 6, 2, 11 The half of the line of the household is 500 degrees, the distance between the two lines should be 4: Um6In. The curve is usually within the range of the domestic specification, and the measured distance should be at least 0.0lm. 2
Distance from the center
Note: The tolerance limit of the curvature of the hammer head can also be selected as: m South A.1 The tolerance limit of the curvature of the hammer head
) The mountain can be broken into a point on the circle of mm. The average time between the control and the control is 10023)tms. The time between the control and the control should be less than ten meters. When using the standard control device with soft rock or uneven surface, the impact rate of the control device should be less than 4 meters below the surface. )14C-61998
There are standard impact finger adjustment and test whether the system meets the requirements of the stable work. The reverse thrower should be able to test the surface of any movable parts on the flat surface. If the reverse test table is not effective, the surface size of the table is very different. When the lower height of the hammer cannot reach the required 10Ⅲ, the support surface can be placed on the support foot to ensure the correct drop height. Also, the impactor should be regularly checked under the standard conditions to see if it meets the requirements. It should be noted that the single type meets the requirements! The test surface of 1" should be avoided for testing. For the impact energy that is not accurate, only one quality is required, including the distance between the hammers, the support of the hammer, the diameter of the hammer, the amount of the hammer (except for the repaired auxiliary) and the maximum possible drop height of the hammer after lifting. The speed, the diameter and curvature of the hammer head, the direction of fall and the time between the hammer and the impact should be checked regularly. The width of the whole shall not exceed 2%. GB/T19889.6-2005/ISO140-6:1998 Appendix H (Informative Appendix) The quality of the lateral sound transmission and the state of the lateral sound transmission shall be checked. The impact speed level can be confirmed by measuring the maximum receiving test piece and the lateral component surface. The average surface vibration velocity level (x+-x
I.) of the sample is given by the formula, in positive units, x+-x
I. = Iigl
Wu Zhong:
The surface vibration velocity level (=_0-m/s!
Xu: In architectural acoustics, the benchmark hysteresis is also estimated using 3×1℃?m, so the industry audit degree in formula 1> can be explained, 3.
If the new transducer is attached to the surface of the test object, its quality should be lower than the surface resistance. If the critical shadow rate of the test piece or the intermediate component is lower than the measured lock rate range, the area is S, and the sound power W in the receiving room of the first structure is estimated by the formula:
W,=nes,n
The average value of the normal surface resistance is: T
The radiation effect is above the critical point
The sustained resistance of air.
-( B 2 2
Receive the average sound pressure level radiated by the lateral components. According to the average surface vibration intensity, it is calculated as follows: .T+:olg
If the reference vibration intensity is 11ir:/s, then C=54eH. If the reference vibration intensity is 35m/%, then C=0. The combined sound pressure level Lm of all lateral components is calculated as follows: Lc = 101g(Z1n*r)
C.1 Introduction
Appendix C
(Informative Appendix)
Guidelines for low-frequency measurement
GB/T19989.6—2005/TSO140-6:199 Low-frequency band [usually refers to less than 4MHz and less than 1MHz] The test room will not meet the conditions of the scattered sound field. This is especially true when the test room area is between 5~1CC㎡°. In the lowest period, there will be at least one direction in the room that meets the general requirements. According to the full range of the bottom room mode, the entire room space produces special waves as the original area. In order to reduce the inconsistency of the measurement results, it is necessary to make some work on the excitation and sampling of the field in the receiving room and the specific requirements for the fast room:
Rooms with small volume and inappropriate dimensions are not suitable for low-frequency measurement. There is at least one direction in the room dimension that is equal to the maximum The wavelength of the center frequency band is the lowest, and the wavelength of the center frequency band is the lowest. The room has sufficient space for the required sound transmission. The minimum distance between the center and the room boundary is shown in Figure 6. The sound level increases within a quarter of the wavelength, so the measurement range increases linearly with the decrease in the measurement range. The minimum distance between each transmitter position and the room boundary is the minimum distance between each transmitter position and the room boundary. C.3 Field sampling In order to obtain reliable data of the spatial average of the user pressure level: the number of microphone positions should be increased: the transmitter positions should be evenly distributed throughout the available space in the test room. When moving the transmitter, it should be sampled evenly throughout the available space. For very low frequencies, the room center is closer than half the distance. Therefore, the microphone should be placed in the center of the room. 4. Average time
For measurements in the band, the average time should be increased to at least 15 times the average time required for the 10011 period. When using a mobile microphone, the average time should not be less than 63. C.5. Reverberation time
For low frequencies, the test room usually has a longer reverberation time. To avoid reverberation, the room can be arranged with absorption or overlap of ordinary room modes to reduce the effect of the reverberation room on the conduction of a single mode. The convex panels of the room with mineral wool are used as the surface analysis board: and the floating ground pole,
1) The composition is 11+-G, which is misleading as 6, 2, 1n
Normal surface vibration rate square average: T
Insert radiation effect, above the critical point
The air resistance.
-(B 2 2
Receive the average sound pressure level radiated by the lateral components, according to the average surface vibration intensity. Calculate according to the following formula:.T+:olg
If the reference vibration path is 11ir:/s. Then C=54eHIf the standard vibration path% is taken × 35m/%. The center is = 0. The combined sound level Lm of all lateral components is calculated according to the following formula: Lc = 101g(Z1n*r)
C.1 Introduction
Appendix C
(Informative Appendix)
Guidelines for low-frequency measurement
GB/T19989.6—2005/TSO140-6:199 Low frequency band [usually refers to less than 4MHz and less than 1MHz] The test room will not be equipped with the conditions of diffuse sound field. This is especially true when the test room area is between 5~1CC㎡°. In the lowest period, there will be at least one spectral in the room. According to the full range of the bottom room mode, the whole room space produces special waves. In order to reduce the variability of the measurement results, it is necessary to make some adjustments in terms of the excitation and sampling of the receiving room and the specific requirements of the room:
Rooms with small volume and inappropriate dimensions are not suitable for low-frequency measurements. The dimensions of the room must have at least one direction equal to the wavelength of the lowest center frequency, and at least ten directions equal to the wavelength of the highest center frequency, so that the room has enough space to transmit the sound as required.
The minimum distance from the center of the room
indicates that the sound level within a quarter-wavelength of the room boundary increases, so the measurement range should be adjusted accordingly. The minimum distance between each transmitter position and the room interface is
C.3 Field sampling
In order to obtain reliable data of the spatial average of the user pressure level: the number of microphone positions should be increased: the transmitter positions should be evenly distributed in the entire available space of the test room, and the sampling should be evenly distributed in the entire available space. For very low frequencies, the room center should be closer than halfway, so the microphone should be placed in the center of the room. 4 Normally For measurements in the band, the averaging time should be increased to at least 15 times the 10011 period. When using a mobile microphone, the averaging time should not be less than 63. C.5 Reverberation time
For low frequencies, hard-wired test rooms generally have longer reverberation times. To avoid reverberation, the room can be arranged with absorption or overlap of normal room modes to reduce the effect of the reverberation of individual modes. The convex panels of the room with mineral wool as the main surface are used for analysis: as well as the floating ground pole,
1) The composition is 11+-G, which is misleading as 6, 2, 1n
Normal surface vibration rate square average: T
Insert radiation effect, above the critical point
The air resistance.
-(B 2 2
Receive the average sound pressure level radiated by the lateral components, according to the average surface vibration intensity. Calculate according to the following formula:.T+:olg
If the reference vibration path is 11ir:/s. Then C=54eHIf the standard vibration path% is taken × 35m/%. The center is = 0. The combined sound level Lm of all lateral components is calculated according to the following formula: Lc = 101g(Z1n*r)
C.1 Introduction
Appendix C
(Informative Appendix)
Guidelines for low-frequency measurement
GB/T19989.6—2005/TSO140-6:199 Low frequency band [usually refers to less than 4MHz and less than 1MHz] The test room will not be equipped with the conditions of diffuse sound field. This is especially true when the test room area is between 5~1CC㎡°. In the lowest period, there will be at least one spectral in the room. According to the full range of the bottom room mode, the whole room space produces special waves. In order to reduce the variability of the measurement results, it is necessary to make some adjustments in terms of the excitation and sampling of the receiving room and the specific requirements of the room:
Rooms with small volume and inappropriate dimensions are not suitable for low-frequency measurements. The dimensions of the room must have at least one direction equal to the wavelength of the lowest center frequency, and at least ten directions equal to the wavelength of the highest center frequency, so that the room has enough space to transmit the sound as required.
The minimum distance from the center of the room
indicates that the sound level within a quarter-wavelength of the room boundary increases, so the measurement range should be adjusted accordingly. The minimum distance between each transmitter position and the room interface is
C.3 Field sampling
In order to obtain reliable data of the spatial average of the user pressure level: the number of microphone positions should be increased: the transmitter positions should be evenly distributed in the entire available space of the test room, and the sampling should be evenly distributed in the entire available space. For very low frequencies, the room center should be closer than halfway, so the microphone should be placed in the center of the room. 4 Normally For measurements in the band, the averaging time should be increased to at least 15 times the 10011 period. When using a mobile microphone, the averaging time should not be less than 63. C.5 Reverberation time
For low frequencies, hard-wired test rooms generally have longer reverberation times. To avoid reverberation, the room can be arranged with absorption or overlap of normal room modes to reduce the effect of the reverberation of individual modes. The convex panels of the room with mineral wool as the main surface are used for analysis: as well as the floating ground pole,
1) The composition is 11+-G, which is misleading as 6, 2, 1
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