CN105509873B - A kind of acoustic stimulation sound impedance test method for not depending on backing - Google Patents

A kind of acoustic stimulation sound impedance test method for not depending on backing Download PDF

Info

Publication number
CN105509873B
CN105509873B CN201510837536.3A CN201510837536A CN105509873B CN 105509873 B CN105509873 B CN 105509873B CN 201510837536 A CN201510837536 A CN 201510837536A CN 105509873 B CN105509873 B CN 105509873B
Authority
CN
China
Prior art keywords
acoustic
acoustic stimulation
hydrophone
sample
stimulation sample
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201510837536.3A
Other languages
Chinese (zh)
Other versions
CN105509873A (en
Inventor
白振国
俞孟萨
余晓丽
李东升
丁逸飞
吕世金
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
702th Research Institute of CSIC
Original Assignee
702th Research Institute of CSIC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 702th Research Institute of CSIC filed Critical 702th Research Institute of CSIC
Priority to CN201510837536.3A priority Critical patent/CN105509873B/en
Publication of CN105509873A publication Critical patent/CN105509873A/en
Application granted granted Critical
Publication of CN105509873B publication Critical patent/CN105509873B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H15/00—Measuring mechanical or acoustic impedance

Landscapes

  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

The invention discloses a kind of acoustic stimulation sound impedance test methods for not depending on backing.Acoustic stimulation sample is placed in underwater sound pipe middle tube body centre position, ensures that acoustic stimulation sample upper and lower surface has certain liquid-column height.Tube body intracavitary one end sets underwater sound transmitting transducer, and two hydrophones are set respectively in the water column of acoustic stimulation sample upper and lower surface, and four hydrophones are connect respectively with data collecting instrument, and data collecting instrument is connect with measuring control computer.Transmitting transducer transmitting is driven to stablize wideband white noise signal；Data collecting instrument acquires the acoustic pressure of hydrophone simultaneously, saves as data file；Liquid-column height in change remeasures storage acoustic pressure data；Acoustic pressure data is deposited in reading, and is calculated the input acoustic impedance of acoustic stimulation sample according to respective formula and transmitted acoustic impedance.The precision of low-frequency test during the present invention can ensure independent of backing；And do not need to take out sample and re-paste backing, easy measurement process promotes measurement efficiency.

Description

A kind of acoustic stimulation sound impedance test method for not depending on backing
Technical field
The invention belongs to underwater sound technical field of measurement and test, are the surveys of a kind of acoustic stimulation input acoustic impedance and transmission acoustic impedance Method for testing.
Background technology
Objective, Validity Test acoustic stimulation acoustical behavior, be acoustic stimulation development important component and The basic foundation of acoustic stimulation application effect assessment.Acoustic resistance anti-performance is the important parameter of acoustic stimulation acoustical behavior, is led to Acoustic absorptivity of the underwater sound coating under different application operating mode can be carried out in advance by crossing the acoustic resistance anti-performance of test acoustic stimulation Report, and the structure noise reduction harmony target strength characteristic for laying acoustic stimulation can be forecast.
Three levels substantially experienced to the understanding of the acoustical behavior of acoustic stimulation test both at home and abroad, the first level is main The acoustic absorptivity and reflectance factor of acoustic stimulation are tested, and acoustic stimulation function and effect are assessed with this, major defect exists It is influenced by backing clearly, to lead to the actual acoustic situation that cannot accurately reflect its application structure in test result；The second layer Secondary main test acoustic stimulation face impedance, derives reflectance factor and acoustic absorptivity with this and then assesses its function and effect, but face Impedance can be used for solving the problems, such as that acoustic target strength problem but cannot be used for solving structure acoustic radiation；The main test sound of third level It learns the input acoustic impedance of coating and transmits acoustic impedance, which is the build-in attribute of acoustic stimulation, with backing spy Property it is unrelated, and available for solving acoustic target intensity and Acoustic Radiation Problems.
For the measurement of the first level and the second level, shipbuilding industry standard CB/T 3674-1995《Underwater acoustic materials standing wave Pipe measuring method》It is elaborated to measuring material acoustic absorptivity in hydroacoustic standing-wave pipe, opposite impedance measurement has carried out phase It speaks on somebody's behalf bright, and illustrates the conversion relation of face impedance and acoustic absorptivity；In addition, national standard GB/T18696.2-2002《Acoustic impedance The measurement part 2 of acoustic absorptivity and acoustic impedance in pipe：Transfer function method》In also give and absorbed sound using air standing wave tube Coefficient and the assay method and conversion relation of acoustic stimulation surface acoustic impedance.
For the measurement of third level, the country has delivered correlative theses, illustrate acoustic stimulation input acoustic impedance and The method and apparatus for transmitting acoustic impedance, method main thought are at the acoustic stimulation back side, to cause using steel back lining application Impedance blocks, so as to meet impedance measurement condition.But firm backing often finite thickness, cannot meet impedance in middle low-frequency range and block Condition, leading to measurement result, there are errors；On the other hand, existing measuring method needs respectively to apply acoustic stimulation two sides Firm backing is simultaneously tested twice, and test process is somewhat cumbersome.
Invention content
The present invention proposes a kind of acoustic stimulation sound impedance test method for not depending on backing, it is therefore an objective to independent of the back of the body It serves as a contrast so as to the precision of low-frequency test in ensureing, and does not need to take out sample and re-paste backing.
Technical scheme is as follows：
A kind of acoustic stimulation sound impedance test method for not depending on backing, includes the following steps：
Acoustic stimulation sample is placed in the tube body centre position of underwater sound plane sound wave conduit, ensures that acoustics is covered by step 1 Two surface sides of cap rock sample have fluid column, and tube body intracavitary one end of the underwater sound plane sound wave conduit is provided with transmitting transducing Device is provided with the first hydrophone and the second hydrophone, acoustics covering in the fluid column of the acoustic stimulation sample first surface side Third hydrophone and the 4th hydrophone are provided in fluid column between layer sample second surface side and transmitting transducer, wherein first Hydrophone is more than the second hydrophone and acoustic stimulation sample first surface spacing with acoustic stimulation sample first surface spacing, 4th hydrophone is more than the 4th hydrophone and acoustic stimulation sample second surface with acoustic stimulation sample second surface spacing Spacing, each hydrophone are connect respectively with data collecting instrument, and the data collecting instrument is connect with measuring control computer；
Step 2 drives the transmitting transducer transmitting to stablize wideband white noise signal；
Step 3, the data collecting instrument acquire the acoustic pressure P of first to fourth hydrophone simultaneously1~P4, save as data text Shelves；
Step 4 reads acoustic pressure data document, and calculates acoustic stimulation the first and second table of sample according to the following formula The acoustic pressure and vibration velocity in face：
In above formula, puRepresent the acoustic pressure of acoustic stimulation sample first surface, vuRepresent acoustic stimulation sample first surface Vibration velocity, pdRepresent the acoustic pressure of acoustic stimulation sample second surface, vdRepresent the vibration velocity of acoustic stimulation sample second surface, d1Represent the first hydrophone and the second hydrophone spacing, h1Represent the first hydrophone and acoustic stimulation sample first surface spacing, d2Represent third hydrophone and the 4th hydrophone spacing, h2Represent third hydrophone and acoustic stimulation sample second surface spacing；
Step 5, on the basis of the acoustic pressure and vibration velocity on first, second surface of acoustic stimulation sample, with acoustic stimulation Transmission function obtains two equations about transmission function as unknown quantity：
Step 6 in the first surface side Jia Shui of acoustic stimulation sample, changes acoustic stimulation sample first surface side Liquid column length；Then step 1 is repeated to step 5, obtains the another two equation about transmission function：
The equation group of step 7, simultaneous step 5 and step 6 obtains the equation group about transmission function that can be solved：
Equation group is solved, obtains the transmission function of acoustic stimulation；
Step 8 calculates the input acoustic impedance of acoustic stimulation sample according to transmission function and transmits acoustic impedance：
Z11=H11/H21
Z12=(H12·H21-H11·H22)/H21
(10)
Z21=1/H21
Z22=-H22/H21
In above formula, Z11Represent the input acoustic impedance of acoustic stimulation sample first surface, Z12Represent acoustic stimulation sample First surface is to the transmission acoustic impedance of second surface, Z21Represent acoustic stimulation sample second surface to the transmission sound of first surface Impedance, Z22Represent the input acoustic impedance of acoustic stimulation sample second surface.
The method have the benefit that：
The present invention can overcome two shortcomings of existing test method：One, existing method test result depend on backing, this The precision of low-frequency test during test method can then ensure independent of backing；Secondly, existing method Impedance measurement needs to test Twice, this test method does not need to take out sample and re-pastes backing, therefore easy measurement process, and effect is measured so as to be promoted Rate.
Description of the drawings
Fig. 1 is acoustic stimulation input acoustic impedance and the test device structure diagram for transmitting acoustic impedance.
Fig. 2 is the input sound impedance test value of typical uniformity rubber layer sample and theoretical value correlation curve.
Fig. 3 is the transmission sound impedance test value of typical uniformity rubber layer sample and theoretical value correlation curve.
Fig. 1 description of symbols：Liquid level on 1-underwater sound plane sound wave conduit；2-1# hydrophones；3-2# hydrophones；4-acoustics Coating sample；5-3# hydrophones；6-4# hydrophones；7-transmitting transducer；D1-1# hydrophones and 2# hydrophone spacing； H1-1# hydrophones and acoustic stimulation sample upper table interplanar distance；D2-3# hydrophones and 4# hydrophone spacing；H2-3# water is listened Device and acoustic stimulation sample following table interplanar distance.
Specific embodiment
The specific embodiment of the present invention is described further below in conjunction with the accompanying drawings.
The invention mainly includes steps：
Step 1, using typical uniformity rubber layer sample as acoustic stimulation sample, as shown in Figure 1, by acoustic stimulation sample Product 4 are placed in underwater sound plane sound wave conduit middle tube body centre position, are disposed vertically tube body (also can be horizontal) in the present embodiment, ensure There are certain liquid-column height (being more than 1m in the present embodiment) in 4 upper surface of acoustic stimulation sample and upper surface.Underwater sound plane sound Tube body intracavitary one end (being lower end in the present embodiment) of waveguide is provided with transmitting transducer 7, transmitting transducer 7 and acoustics covering There are two hydrophones for setting between layer sample 4：3# hydrophones 5,4# hydrophones 6,4 underwater sound plane sound wave of acoustic stimulation sample are led There are two hydrophones for setting between liquid level 1 on pipe：1# hydrophones 2,2# hydrophones 3, four hydrophones respectively with data collecting instrument (not shown in figure 1) connects, and data collecting instrument is connect with measuring control computer (not shown in figure 1).
Preferably, hydrophone uses 8103 hydrophones of B＆K companies, and data collecting instrument is using the 3560D types acquisition of B＆K companies For instrument, it can be achieved that signal transmitting, acoustics and vibration signal synchronous acquire, measurement control computer is equipped with Pulse Labshop softwares, Data collecting instrument can be controlled to carry out signal transmitting, data acquisition and the input acoustic impedance and biography that calculate acoustic stimulation sample 4 Pass acoustic impedance.
Step 2, the driving transmitting of transmitting transducer 7 are stablized wideband white noise signal, are had by data collecting instrument confirmation signal It imitates and carries out data acquisition.
Step 3, data collecting instrument acquire the acoustic pressure P of 1#~4# hydrophones simultaneously1~P4, save as data file.
Step 4 reads acoustic pressure data document, and calculates the sound of 4 upper and lower surface of acoustic stimulation sample according to the following formula Pressure and vibration velocity：
In formula (1), puRepresent the acoustic pressure of acoustic stimulation sample upper surface, vuRepresent acoustic stimulation sample upper surface Vibration velocity, pdRepresent the acoustic pressure of acoustic stimulation sample lower surface, vdRepresent the vibration velocity of acoustic stimulation sample lower surface, d1It represents 1# hydrophones and 2# hydrophone spacing, h1Represent 1# hydrophones and acoustic stimulation sample upper table interplanar distance, d2Represent 3# hydrophones With 4# hydrophone spacing, h2Represent 3# hydrophones and acoustic stimulation sample following table interplanar distance.
Step 5 on the basis of the acoustic pressure and vibration velocity of 4 upper and lower surface of acoustic stimulation sample, is transmitted with acoustic stimulation Function can obtain two equations about transmission function as unknown quantity：
Step 6 in 4 top Jia Shui of acoustic stimulation sample, changes 4 top liquid column length of acoustic stimulation sample.Then Step 1 is repeated to step 5, storage acoustic pressure data is remeasured, and calculate according to respective formula, obtains about transmission function Another two equation：
The equation group of step 7, simultaneous step 5 and step 6 obtains the equation group about transmission function that can be solved：
Equation group is solved, obtains the transmission function of acoustic stimulation.
Step 8 calculates the input acoustic impedance of acoustic stimulation sample according to transmission function and transmits acoustic impedance：
Z11=H11/H21
Z12=(H12·H21-H11·H22)/H21
(15)
Z21=1/H21
Z22=-H22/H21
In formula (5), Z11Represent the input acoustic impedance of acoustic stimulation sample upper surface, Z12Represent acoustic stimulation sample Upper surface is to the transmission acoustic impedance of lower surface, Z21Represent acoustic stimulation sample lower surface to the transmission acoustic impedance of upper surface, Z22 Represent the input acoustic impedance of acoustic stimulation sample lower surface.
Finally, data processing is carried out, obtain the input acoustic impedance of typical uniformity rubber sample and transmits acoustic impedance with frequency Change curve, and compared with theoretical value, as shown in Figures 2 and 3.Above-mentioned curve show test result and notional result coincide compared with It is good.
What has been described above is only a preferred embodiment of the present invention, and the present invention is not limited to above example.It is appreciated that this The oher improvements and changes that field technology personnel directly export or associate without departing from the basic idea of the present invention, It is considered as being included within protection scope of the present invention.

Claims (1)

  1. A kind of 1. acoustic stimulation sound impedance test method for not depending on backing, it is characterised in that include the following steps：
    Acoustic stimulation sample is placed in the tube body centre position of underwater sound plane sound wave conduit by step 1, ensures acoustic stimulation Two surface sides of sample have fluid column, and tube body intracavitary one end of the underwater sound plane sound wave conduit is provided with transmitting transducer, institute It states and the first hydrophone and the second hydrophone, acoustic stimulation sample is provided in the fluid column of acoustic stimulation sample first surface side Third hydrophone and the 4th hydrophone are provided in fluid column between second surface side and transmitting transducer, wherein the first hydrophone It is more than the second hydrophone and acoustic stimulation sample first surface spacing, the 4th water with acoustic stimulation sample first surface spacing Device is listened to be more than third hydrophone and acoustic stimulation sample second surface spacing, institute with acoustic stimulation sample second surface spacing It states each hydrophone to connect with data collecting instrument respectively, the data collecting instrument is connect with measuring control computer；
    Step 2 drives the transmitting transducer transmitting to stablize wideband white noise signal；
    Step 3, the data collecting instrument acquire the acoustic pressure P of first to fourth hydrophone simultaneously1~P4, save as data file；
    Step 4 reads acoustic pressure data document, and calculates the first and second surface of acoustic stimulation sample according to the following formula Acoustic pressure and vibration velocity：
    In above formula, puRepresent the acoustic pressure of acoustic stimulation sample first surface, vuRepresent shaking for acoustic stimulation sample first surface Speed, pdRepresent the acoustic pressure of acoustic stimulation sample second surface, vdRepresent the vibration velocity of acoustic stimulation sample second surface, d1Table Show the first hydrophone and the second hydrophone spacing, h1Represent the first hydrophone and acoustic stimulation sample first surface spacing, d2Table Show third hydrophone and the 4th hydrophone spacing, h2Represent third hydrophone and acoustic stimulation sample second surface spacing；
    Step 5 on the basis of the acoustic pressure and vibration velocity on first, second surface of acoustic stimulation sample, is transmitted with acoustic stimulation Function obtains two equations about transmission function as unknown quantity：
    Step 6 in the first surface side Jia Shui of acoustic stimulation sample, changes the liquid of acoustic stimulation sample first surface side Column length；Then step 1 is repeated to step 5, obtains the another two equation about transmission function：
    The equation group of step 7, simultaneous step 5 and step 6 obtains the equation group about transmission function that can be solved：
    Equation group is solved, obtains the transmission function of acoustic stimulation；
    Step 8 calculates the input acoustic impedance of acoustic stimulation sample according to transmission function and transmits acoustic impedance：
    In above formula, Z11Represent the input acoustic impedance of acoustic stimulation sample first surface, Z12Represent acoustic stimulation sample first Surface is to the transmission acoustic impedance of second surface, Z21Represent acoustic stimulation sample second surface to the transmission acoustic resistance of first surface It is anti-, Z22Represent the input acoustic impedance of acoustic stimulation sample second surface.
CN201510837536.3A 2015-11-26 2015-11-26 A kind of acoustic stimulation sound impedance test method for not depending on backing Active CN105509873B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510837536.3A CN105509873B (en) 2015-11-26 2015-11-26 A kind of acoustic stimulation sound impedance test method for not depending on backing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510837536.3A CN105509873B (en) 2015-11-26 2015-11-26 A kind of acoustic stimulation sound impedance test method for not depending on backing

Publications (2)

Publication Number Publication Date
CN105509873A CN105509873A (en) 2016-04-20
CN105509873B true CN105509873B (en) 2018-06-19

Family

ID=55718022

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510837536.3A Active CN105509873B (en) 2015-11-26 2015-11-26 A kind of acoustic stimulation sound impedance test method for not depending on backing

Country Status (1)

Country Link
CN (1) CN105509873B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108344497A (en) * 2017-12-14 2018-07-31 中国船舶重工集团公司第七〇五研究所 The optical test method of underwater acoustic array mutual radiation impedance
CN110426460B (en) * 2019-05-10 2022-08-16 中国船舶重工集团公司第七一五研究所 Traveling wave tube measuring device and method for decoupling characteristic parameters of underwater acoustic material

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
双层圆柱壳舷间声振耦合特性及控制技术;白振国;《中国博士学位论文全文数据库 工程科技II辑》;20141215(第12期);全文 *
声波在覆盖层和船体结构中的传递特性研究;于丹竹;《中国优秀硕士学位论文全文数据库 工程科技II辑》;20120515(第05期);全文 *
静水压下声学覆盖层声阻抗研究;邹明松 等;《舰船科学技术》;20130331;第35卷(第3期);第57-60、68页 *

Also Published As

Publication number Publication date
CN105509873A (en) 2016-04-20

Similar Documents

Publication Publication Date Title
CN106770664B (en) A method of edge defect detection is improved based on total focus imaging algorithm
CN102159943A (en) Method for investigating structure and structure for receiving and/or conducting liquid or soft medium
CN108369242A (en) Improved beam forming acoustic signal traveling time flowmeter
CN104297346A (en) Nondestructive detection system of sheet metal by ultrasonic planar guided-wave and detection method thereof
CN104359976A (en) Method for accurately quantifying flaw height of girth welding seam in submarine pipeline
CN102043015B (en) Ultrasonic guided wave device and method for detecting defect at rail bottom of steel rail at long distance
Blum et al. Noncontacting benchtop measurements of the elastic properties of shales
CN205036370U (en) A device for evaluating two interface cement of cased well tie quality
CN106066365B (en) Storage tank bottom plate In-service testing System and method for based on mangneto formula horizontal shear wave
RU2017139770A (en) INSTALLATION AND METHOD OF REMOTE MEASUREMENT OF GEOMETRIC PARAMETERS OF THE PIPELINE AT THE STAGE OF THE REMOVAL BY MEANS OF SOUND WAVES IN THE MODE OF REAL TIME
CN105509873B (en) A kind of acoustic stimulation sound impedance test method for not depending on backing
CN105424810A (en) Evaluation method for uniformity of fiber reinforcement ceramic matrix composite
CN104007181A (en) Single crystal silicon rod defect ultrasonic-detection system and method
CN201236700Y (en) Sector cement bond logging instrument
Froelich Multimode evaluation of cement behind steel pipe
CN103604728A (en) Sand grain diameter detection device and method based on fluid/solid interface wave
CN109490417B (en) Ultrasonic detection method for plane anisotropy of metal material
Li et al. An assessment of concrete over asphalt pavement using both the ultrasonic surface wave and impact echo techniques
CN2856949Y (en) Sonic wave speed detector for pipeline
CN103512953B (en) Adopt multi-probe supersonic testing method
CN108008007A (en) Aluminium alloy cast ingot defect-detecting equipment and method of detection
CN204754918U (en) Pore -forming grooving detection device
Castaings et al. The sensitivity of surface guided modes to the bond quality between a concrete block and a composite plate
US20200233109A1 (en) Liquid coupled ultrasonic transducer array for measurement of rock elastic properties
Jiang et al. Cased borehole acoustic-wave propagation with varying bonding conditions: Theoretical and experimental modeling

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant