CN111189928A - Sound insulation measuring device and method for measuring plate-shaped component in reverberation sound insulation pool - Google Patents
Sound insulation measuring device and method for measuring plate-shaped component in reverberation sound insulation pool Download PDFInfo
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- CN111189928A CN111189928A CN202010021779.0A CN202010021779A CN111189928A CN 111189928 A CN111189928 A CN 111189928A CN 202010021779 A CN202010021779 A CN 202010021779A CN 111189928 A CN111189928 A CN 111189928A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/11—Analysing solids by measuring attenuation of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
- G01H3/10—Amplitude; Power
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H3/00—Measuring characteristics of vibrations by using a detector in a fluid
- G01H3/10—Amplitude; Power
- G01H3/14—Measuring mean amplitude; Measuring mean power; Measuring time integral of power
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/015—Attenuation, scattering
Abstract
The invention provides a device and a method for measuring sound insulation of a plate-shaped member in a reverberation sound insulation pool. Firstly, calibrating the sound field of two reverberation sound insulation pools, radiating sound energy in a sound generating chamber by a sound source, and measuring the spatial average sound pressure level and the room constant in a receiving chamber by a hydrophone array; then, mounting the sound insulation member on a flexible connecting flange between two reverberation sound insulation pools; under the condition of keeping the radiated sound characteristic of the sound source unchanged, measuring the spatial average sound pressure level Lp in the sound generating chamber and the receiving chamber1And Lp2And finally, obtaining the sound insulation quantity of the sound insulation member by using the difference of the measured space average sound pressure levels and the correction quantity. The two reverberation sound insulation pools adopt a flexible connection mode, thereby avoiding the mutual transmission between the wall surface vibrations of the two pools, and playing the roles of vibration isolation and sound insulationThe effect of sound; the method has the characteristic of high precision of low-frequency narrow-band measurement; the method of the invention can conveniently and quickly obtain the average sound insulation quantity of the sound insulation material.
Description
Technical Field
The invention relates to an underwater sound measuring device, and also relates to an underwater sound measuring method, in particular to a device and a method for measuring the sound insulation quantity of a plate-shaped member in a reverberation sound insulation pool.
Background
Currently, the sound insulation performance test of acoustic materials is mature in air acoustic measurement, and the most common measurement methods are as follows: standing wave tube, free field, and reverberation chamber methods. The testing method has advantages and disadvantages, the standing wave tube method is simple, the used samples are few, but the defect is that the testing method can only test the sound insulation quantity in the vertical direction; the free field method is earlier and most widely used, but the low-frequency silencing water pool firstly has the sound absorption performance with the sound absorption wedge; the reverberation chamber method is used for measuring the sound insulation quantity of the material on the basis of the assumption of the condition of a diffusion field. The sound insulation amount of the material is calculated from the loss of acoustic energy in the receiving chambers before and after the insertion of the material by using the principle of a diffuse sound field in two reverberation chambers having conditions similar to the diffuse sound field. The requirements are that the room must have good diffusivity and long reverberation time, which is obviously difficult to realize in the field of underwater sound. A plurality of corresponding national standards of acoustic sound insulation measurement of acoustic buildings and building components (GB/T19889.3-2005), civil building sound insulation design specifications (GB 50118-2010), reverberation room sound insulation measurement of aeronautical materials and components (HB 7125-1994) and the like exist at present. Due to the difference in acoustic properties between aqueous and air media, it is reflected in: the diffused sound field of the air sound reverberation chamber cannot be established underwater; the absolute hard condition of the sound insulation chamber cannot be established underwater; the vibration transmission between the two sound insulation chambers cannot be isolated, so that the sound insulation performance test of the underwater sound material cannot be realized, and therefore, the standards and the methods are not applicable to the field of underwater sound measurement.
At present, in the field of underwater sound measurement and similar tests, a device for measuring sound absorption and sound insulation coefficients of an underwater acoustic material based on a reverberation method (a comparison document 1) adopts a three-reverberation-box structure, wherein the third reverberation box is a device for vibration isolation treatment of an organic glass plate and is provided with devices for air release, water injection and the like, and the device is different from the comparison document in that a reverberation sound insulation pool applicable to the invention has no requirements on the size and is applicable to pools with any shapes and sizes; the two reverberation sound insulation pools are of double-layer structures, and sound insulation materials or air layers are filled in the middle of the reverberation sound insulation pools, so that vibration isolation and sound insulation treatment are realized, sound reflection is good, sound energy density in a sound field is enhanced, and the signal to noise ratio of a test is improved; the two reverberation sound insulation pools are connected by adopting a hose instead of a hard material, so that the vibration transmission between the pools is reduced to the greatest extent; the bottom rollers are designed in the receiving chamber, so that the reverberation sound insulation water pool can be moved, assembled and disassembled; the design of the longitudinal wide section of the connecting piece between the two reverberation sound insulation pools ensures that a reverberation sound field is not influenced by the low frequency cut-off of a normal mode of a pipeline, which is an important aspect not embodied in the existing literature.
In the traditional sound insulation measuring principle and the traditional sound insulation measuring specification of the reverberation room, a calculation formula is obtained by making a plurality of assumptions and approximations, and the invention provides strict correction quantity of sound insulation quantity, which is accurate and precise calculation.
Disclosure of Invention
The invention aims to provide a sound insulation measuring device for a plate-shaped member in a reverberation sound insulation pool, which has high low-frequency narrow-band measuring precision and can conveniently and quickly obtain the average sound insulation amount of a sound insulation material. The invention also aims to provide a measuring method of the sound insulation measuring device for the plate-shaped member based on the reverberation sound insulation pool.
The purpose of the invention is realized as follows:
the sound insulation measuring device for the plate-shaped member of the reverberation sound insulation pool comprises two reverberation sound insulation pools, a connecting piece between the two reverberation sound insulation pools and a hydrophone array, wherein each reverberation sound insulation pool comprises a double-layer wall surface and a support between an inner wall and an outer wall, an elastic vibration reduction support is arranged at the bottom of the first reverberation sound insulation pool, a roller is arranged at the bottom of the second reverberation sound insulation pool, the connecting piece comprises a flexible connecting pipeline and a flange plate, one end of the flexible connecting pipeline is arranged at the center of the side wall of the reverberation sound insulation pool, the flange plate is fixed at the other end of the flexible connecting pipeline, the two sections of flexible connecting pipelines are connected through the two flange plates, and the hydrophone array is a vertical array formed by a plurality of hydrophone.
The sound insulation quantity measuring device for the plate-shaped member of the reverberation sound insulation pool can further comprise:
1. and a sound insulation material or an air layer is filled between the inner wall and the outer wall.
2. The total number of the hydrophones is not less than 250.
The measuring method of the sound insulation measuring device for the plate-shaped member based on the reverberation sound insulation pool comprises the following steps:
the first step is as follows: the two reverberation sound insulation pools are directly connected by a connecting piece, a material component to be tested is not needed, and the two reverberation sound insulation pools are isolated by adopting the same material as the inner shell; injecting water to ensure that the heights of water levels in the two reverberation and sound insulation water pools are the same, wherein the two reverberation and sound insulation water pools are respectively a sounding room and a receiving room;
the second step is that: calibrating pool sound field, in sound-producing chamber, using standard sound source to stably radiate sound energy by using broadband or narrowband signal, in sound-producing chamber and receiving chamber, respectively measuring space average sound pressure level under empty pool, recording it as Lp0(ii) a According to the space average sound power frequency spectrum curves of the sound-emitting chamber and the receiving chamber, the cut-off frequency is measured by comparing the reverberation methods in the two chambers, the maximum value of the cut-off frequency and the maximum value of the cut-off frequency is determined as the lowest frequency of sound insulation measurement, and meanwhile, the room constant R of the receiving chamber is measured according to the reverberation time measuring method;
the third step: mounting a component to be tested on a flange plate of a connecting piece, and keeping the same height of water levels in the front reverberation sound insulation water tank and the rear reverberation sound insulation water tank;
the fourth step: keeping the sound source radiating sound signals in the same working state, measuring the space average sound pressure level of the component to be measured after the component to be measured is installed by the hydrophone, and recording the space average sound pressure level in the sounding chamber as Lp1And the spatial average sound pressure level in the receiving chamber is recorded as Lp2；
The fifth step: the sound insulation TL of the member to be measured is represented as:
TL＝Lp1-Lp2+10lg4S/A
in the formula, S is the area of the component to be measured, and A is the sound absorption capacity of the sound insulation pool.
The measurement method of the present invention may further include:
1. in the second step, the sound source is fixedly arranged in the sound-emitting chamber or is moved in a space scanning manner.
2. In the second step, the hydrophone array is a vertical array formed by a plurality of hydrophone arrays, and the total number of the hydrophones is not less than 250.
3. In the second step, the spatial average sound pressure level Lp under the empty water pool0The measuring method comprises the following steps:
(1) radiating acoustic signals with a standard sound source continuously and stably, and measuring sound pressure time domain signals received by a hydrophone by data acquisition equipment;
(2) performing power spectrum analysis on the voltage time domain signal measured by each hydrophone, and performing arithmetic average on the sound power spectrum in the acquisition duration;
(3) and (4) performing arithmetic average on the time average value of the power spectrums of all the hydrophones to obtain the spatial average power spectrum level under the empty water pool.
4. The fixed placement of the sound source in the sound producing chamber means that: the distance between any two hydrophones and the distance between the hydrophones and the wall or the water surface of the tank are not less than 1/4 of the wavelength corresponding to the lowest frequency in the test.
5. The sound source does space scanning movement in the sounding chamber, which means that: the space scanning type is that a single hydrophone moves in a receiving chamber in an S-shaped track at a uniform speed, and the shortest distance between the moving track and a pool or the water surface is not less than 1/4 of the wavelength corresponding to the lowest frequency in the test.
The method does not require the scale and the shape of the reverberation sound insulation pool, and the adopted pool sound field calibration method has general practicability, wherein the calibrated sound field characteristic parameters provide analysis basis for sound insulation measurement.
The invention relates to a method for measuring the sound insulation quantity of a plate-shaped member in a reverberation sound insulation pool, which is firstly provided in the field of underwater sound measurement and has the following beneficial effects:
1. in the traditional reverberation room method measurement, two reverberation rooms are directly connected or rigidly connected, and the two reverberation sound insulation pools adopt a flexible connection mode, so that the mutual transmission between wall surface vibrations of the two pools is avoided, and the effects of vibration isolation and sound insulation are achieved;
2. the method has the characteristic of high precision of low-frequency narrow-band measurement;
3. the method can conveniently and quickly obtain the average sound insulation quantity of the sound insulation material, and has more engineering applicability compared with the standing wave tube method which can only obtain the sound absorption quantity in the vertical direction.
4. The component sound insulation TL calculation formula is a precise calculation formula.
Drawings
Fig. 1 is a schematic diagram of a sound insulation measuring device for a plate-shaped member of a reverberation sound insulation pool of the invention.
FIG. 2 is a flow chart of the method for measuring the sound insulation quantity of the plate-shaped member in the reverberation sound insulation pool.
Fig. 3 is a sectional view of a reverberation sound insulation pool.
Detailed Description
The invention is described in more detail below by way of example.
The invention relates to a sound insulation measuring device for a plate-shaped member of a reverberation sound insulation pool, which comprises: two reverberation sound insulation pools 1 and 3 with double-layer structures, a connecting piece 2 between the two reverberation sound insulation pools, and a hydrophone array 4.
The reverberation sound insulation pool is composed of double-layer wall surfaces 11, I-shaped steel supports 12 are arranged between the inner wall and the outer wall of the reverberation sound insulation pool, and sound insulation materials are filled 13 or are air layers. The bottom of the reverberation sound insulation pool 1 is supported by an elastic vibration reduction bracket 14, and the bottom of the reverberation sound insulation pool 2 is provided with rollers 31, so that the reverberation sound insulation pool is convenient to move, assemble and disassemble.
The connecting piece comprises a flexible connecting pipeline and a flange plate. The flexible connecting pipeline is arranged in the center of the side wall of the reverberation sound insulation water pool, and the flange plate is fixed at the other end of the flexible connecting pipeline. The flange plate member has the structural characteristics of short longitudinal dimension and large cross sectional area, and the diameter D of the cross section of the flange plate member is 1/4 of the dimension of the wall surface of the reverberation sound insulation pool connected with the flange plate member. The longitudinal dimension of the flexible connecting pipeline is smaller than the diameter D of the cross section of the flange. The component to be tested is clamped between the two flange plates through bolts.
The measuring method of the sound insulation measuring device for the plate-shaped member based on the reverberation sound insulation pool comprises three steps of calibrating a sound field of the reverberation sound insulation pool, installing a member to be measured and measuring the sound insulation quantity of the member, and is characterized by being subdivided into the following steps:
the first step is as follows: the two reverberation sound insulation pools are directly connected through a connecting piece, a component made of materials to be tested does not exist, and the two reverberation sound insulation pools are isolated by adopting materials with the same inner shells. And injecting water so that the water level heights in the two water tanks are the same. The two reverberation sound insulation pools are respectively recorded as: a sound-emitting chamber and a receiving chamber.
The second step is that: and (5) calibrating a pool sound field. In the sounding chamber, a standard sound source radiates sound energy stably in a broadband or narrowband signal, and in the sounding chamber and the receiving chamber, hydrophone arrays respectively measure the spatial average sound pressure level under an empty water pool, which is recorded as Lp0. According to the space average sound power frequency spectrum curves of the sound-emitting chamber and the receiving chamber, the reverberation method in the two chambers is compared to measure the cut-off frequency, and the maximum value of the two is taken to determine the lowest frequency of sound insulation measurement. While measuring the room constant R of the receiving room according to the reverberation time measurement method.
In the second step, the sound source is fixedly arranged in the sound producing chamber or does space scanning movement. The measurement precision of the method is effectively improved by adopting a space scanning movement mode.
In the second step, the hydrophone array is a vertical array composed of a plurality of hydrophone arrays. Under the condition that the total number of the hydrophones is not less than 250, the measurement precision can reach +/-1 dB. The more the total number of hydrophones, the higher the lifting accuracy.
In the second step, the spatial average sound pressure level Lp under the empty water pool0Thus obtained is:
1. the standard sound source continuously and stably radiates sound signals, and the data acquisition equipment measures sound pressure time domain signals received by the hydrophone.
2. And performing power spectrum analysis on the voltage time domain signal measured by each hydrophone, and performing arithmetic average on the sound power spectrum in the acquisition duration.
3. And (4) performing arithmetic average on the time average value of the power spectrums of all the hydrophones to obtain the spatial average power spectrum level under the empty water pool.
The third step: and (3) mounting the component to be tested on the flange plate of the connecting piece, and keeping the same height of the water level in the front reverberation sound insulation water tank and the back reverberation sound insulation water tank.
And in the third step, the component to be tested is arranged on the flange plate by screws, and the installation tightness is ensured.
The fourth step: keeping the sound source radiating sound signals in the same working state, measuring the space average sound pressure level of the component to be measured after the component to be measured is installed by the hydrophone, and recording the space average sound pressure level in the sounding chamber as Lp1And the spatial average sound pressure level in the receiving chamber is recorded as Lp2。
The fifth step: the sound insulation TL of the member is expressed as:
TL＝Lp1-Lp2+10lg4S/A (1)
wherein S is the area of the component, and A is the sound absorption capacity of the sound insulation pool.
In the first step and the third step, the connecting piece between the two reverberation sound insulation pools is a connecting pipeline made of flexible materials, and the horizontal state of the connecting pipeline is maintained in a flexible suspension or supporting mode. The middle of the connecting pipeline is connected by a flexible flange.
In the second step and the fifth step, the sound source stably radiates sound energy, and the signal-to-noise ratio in the receiving chamber is not less than 15 dB. The method for measuring the space average sound pressure by the hydrophones in the test chamber can adopt a fixed type or a space scanning type, wherein the fixed type is that the hydrophones are uniformly distributed in the test chamber, and the distance between any two hydrophones and the distance from the hydrophones to the wall of the tank or the water surface are not less than 1/4 of the wavelength corresponding to the lowest frequency in the test; the space scanning type is that a single hydrophone moves in a receiving chamber at a uniform speed in an S-shaped track, and the shortest distance between the moving track and a pool or the water surface is not less than 1/4 of the wavelength corresponding to the lowest frequency in the test. The test time of the hydrophones of the two modes is not less than 60 s.
The reverberation sound insulation pool is a double-shell rectangular structure, the size of an inner shell is 15m long, 9m wide and 6.5m deep, and the shell is made of toughened glass. The outer shell is a steel plate. The distance between the two layers of shells is 0.5m, the shells are supported by I-shaped steel, and the gap part is filled with a foaming plastic plate. The contact surface of the bottom of the outer shell of the sound generating chamber and the ground is supported by the shock absorber, and the contact surface of the bottom of the outer shell of the receiving chamber and the ground is provided with the roller. And holes with the diameter of 2m are formed in the centers of the opposite side surfaces of the two reverberation sound insulation pools. The length of the flexible plastic pipe is 2m, the flexible plastic pipe penetrates through the outer hole and is connected and sealed with the inner shell hole, and the flexible plastic pipe is elastically supported or flexibly suspended. The other end of the flexible plastic pipe is connected with a plastic flange, and the two sets of flanges are butted by screws to be assembled. The reverberation sound insulation pool ensures the structural strength and meets the requirement that the reflection coefficient of the wall surface is more than 0.8.
The standard broadband nondirectional transmitting transducer is suspended in a sounding chamber, and the hydrophone array is a vertical array of 16 array elements which are uniformly distributed in a receiving chamber. Wherein the distance between the uppermost end array element and the lowermost end array element of the hydrophone array and the water surface and the pool bottom is 0.5m, and the middle array elements are distributed at equal intervals.
The first step, connecting surfaces of two reverberation sound insulation pools are in butt joint, bottom rollers are fixed, two flexible connecting pieces are connected by a flange plate, and the middle of the flange plate is separated from the two sound insulation pools by using a material the same as that of the inner shell. And (5) injecting water. And finishing the assembly of the reverberation sound insulation water pool.
And secondly, stably radiating a broadband sound signal into water by the transmitting transducer, and measuring a sound wave time domain signal received by the hydrophone by the data acquisition unit for 1 minute. And analyzing the tested sound wave time domain signal by a power spectrum, and calculating the power spectrum in the measurement duration to perform time averaging. And averaging the time average power spectrums of all the array elements to obtain the space average sound pressure level under the two empty water pools. And determining the lower limit frequency of the test according to the space average power spectrum curve.
Under the condition that the water level of the reverberation sound insulation pool is not obviously changed, the spatial average sound pressure level calibrated by the sound field of the upper empty pool only needs to be calibrated once, and calibration data are recorded and stored.
Here, reverberation time of the receiving room is measured according to the interrupted sound source method, and then a room constant of the receiving room is calculated.
And mounting a component to be tested, and clamping the component to be tested between the two flange plates to ensure sealing.
And thirdly, the transmitting transducer keeps the same working state as the transmitting-receiving state tested in the second step, the hydrophone array and the data collector keep the same collecting state, and the spatial average sound pressure level of the component to be tested after installation is measured.
And (4) calculating the sound insulation quantity of the component to be measured according to the formula (1).
In the measuring system and the measuring method, the reverberation sound insulation water tank with the double-shell structure meets the requirements of vibration reduction and sound insulation treatment, so that the isolation of external interference is realized, and the reverberation characteristic of a test environment and the signal-to-noise ratio of the test are enhanced; the flexible plastic pipe blocks the vibration transmission between the two reverberation sound insulation pools; the hydrophone array test meets the test accuracy requirements mentioned in the claims. The measuring system and the measuring method have the advantages of high measuring efficiency and short time; the measurement precision is high, the probability that the measurement precision is within the range of +/-1 dB is more than 90%, and the measurement precision is improved by increasing the number of hydrophones.
In the embodiment of the invention, a set of hydrophone arrays can be respectively arranged in the sounding chamber and the receiving chamber, and the same set of hydrophone arrays can also be used for testing in the sounding chamber and the receiving chamber respectively, namely: after the component to be measured is installed, the hydrophone array is placed in the sounding chamber, the spatial average sound pressure level in the sounding chamber is measured, and then the hydrophone array is moved from the sounding chamber to the receiving chamber to measure the spatial average sound power level in the receiving chamber.
Claims (9)
1. The utility model provides a reverberation sound insulation pond measures slabby component sound insulation volume measuring device, includes two reverberation sound insulation ponds, connecting piece and hydrophone battle array between two reverberation sound insulation ponds, characterized by: the reverberation sound insulation water tank comprises a double-layer wall surface, a support between an inner wall and an outer wall, an elastic vibration reduction support is arranged at the bottom of the first reverberation sound insulation water tank, rollers are arranged at the bottom of the second reverberation sound insulation water tank, the connecting piece comprises a flexible connecting pipeline and flange plates, one end of the flexible connecting pipeline is arranged at the center of the side wall of the reverberation sound insulation water tank, a flange plate is fixed at the other end of the flexible connecting pipeline, the two sections of flexible connecting pipelines are connected through the two flange plates, and the hydrophone array is a vertical array formed by a plurality of hydrophone arrays.
2. The apparatus for measuring the sound insulation amount of a plate-shaped member for measuring a reverberation sound insulation pool according to claim 1, wherein: and a sound insulation material or an air layer is filled between the inner wall and the outer wall.
3. The sound insulation measuring device for the plate-shaped member of the reverberation sound insulation pool according to the claim 1 or 2, which is characterized in that: the total number of the hydrophones is not less than 250.
4. The method for measuring the sound insulation quantity of the plate-shaped member based on the reverberation sound insulation pool of claim 1 is characterized by comprising the following steps:
the first step is as follows: the two reverberation sound insulation pools are directly connected by a connecting piece, a material component to be tested is not needed, and the two reverberation sound insulation pools are isolated by adopting the same material as the inner shell; injecting water to ensure that the heights of water levels in the two reverberation and sound insulation water pools are the same, wherein the two reverberation and sound insulation water pools are respectively a sounding room and a receiving room;
the second step is that: calibrating pool sound field, in sound-producing chamber, using standard sound source to stably radiate sound energy by using broadband or narrowband signal, in sound-producing chamber and receiving chamber, respectively measuring space average sound pressure level under empty pool, recording it as Lp0(ii) a According to the space average sound power frequency spectrum curves of the sound-emitting chamber and the receiving chamber, the cut-off frequency is measured by comparing the reverberation methods in the two chambers, the maximum value of the cut-off frequency and the maximum value of the cut-off frequency is determined as the lowest frequency of sound insulation measurement, and meanwhile, the room constant R of the receiving chamber is measured according to the reverberation time measuring method;
the third step: mounting a component to be tested on a flange plate of a connecting piece, and keeping the same height of water levels in the front reverberation sound insulation water tank and the rear reverberation sound insulation water tank;
the fourth step: keeping the sound source radiating sound signals in the same working state, measuring the space average sound pressure level of the component to be measured after the component to be measured is installed by the hydrophone, and recording the space average sound pressure level in the sounding chamber as Lp1And the spatial average sound pressure level in the receiving chamber is recorded as Lp2；
The fifth step: the sound insulation TL of the member to be measured is represented as:
TL＝Lp1-Lp2+10lg 4S/A
in the formula, S is the area of the component to be measured, and A is the sound absorption capacity of the sound insulation pool.
5. The measurement method according to claim 4, wherein: in the second step, the sound source is fixedly arranged in the sound-emitting chamber or is moved in a space scanning manner.
6. The measurement method according to claim 5, wherein: in the second step, the hydrophone array is a vertical array formed by a plurality of hydrophone arrays, and the total number of the hydrophones is not less than 250.
7. The measuring method according to claim 4 or 5, characterized in that: in the second step, the spatial average sound pressure level Lp under the empty water pool0The measuring method comprises the following steps:
(1) radiating acoustic signals with a standard sound source continuously and stably, and measuring sound pressure time domain signals received by a hydrophone by data acquisition equipment;
(2) performing power spectrum analysis on the voltage time domain signal measured by each hydrophone, and performing arithmetic average on the sound power spectrum in the acquisition duration;
(3) and (4) performing arithmetic average on the time average value of the power spectrums of all the hydrophones to obtain the spatial average power spectrum level under the empty water pool.
8. A method according to claim 5, 6 or 7, wherein the fixed placement of the sound source in the sound-generating chamber is: the distance between any two hydrophones and the distance between the hydrophones and the wall or the water surface of the tank are not less than 1/4 of the wavelength corresponding to the lowest frequency in the test.
9. A method according to claim 5, 6 or 7, wherein the spatially scanning movement of the sound source in the sound-emitting chamber is: the space scanning type is that a single hydrophone moves in a receiving chamber in an S-shaped track at a uniform speed, and the shortest distance between the moving track and a pool or the water surface is not less than 1/4 of the wavelength corresponding to the lowest frequency in the test.
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| CN114811251A (en) * | 2022-02-25 | 2022-07-29 | 中国船舶重工集团公司第七一九研究所 | Silencer control method and device, electronic equipment and silencer |
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