CN105223271A - Anti-during underwater sound passive material oise insulation factor under a kind of limited space conditions focus on measuring method - Google Patents
Anti-during underwater sound passive material oise insulation factor under a kind of limited space conditions focus on measuring method Download PDFInfo
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- CN105223271A CN105223271A CN201510550989.8A CN201510550989A CN105223271A CN 105223271 A CN105223271 A CN 105223271A CN 201510550989 A CN201510550989 A CN 201510550989A CN 105223271 A CN105223271 A CN 105223271A
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- oise insulation
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Abstract
Anti-during underwater sound passive material oise insulation factor under a kind of limited space conditions focus on measuring method, comprise the following steps: anti-when 1) generating to transmit; 2) without the collection of focus signal during test sample; 3) collection of transmission focusing signal when testing sample is had; 4) calculating of oise insulation factor; 5) correction of oise insulation factor.Focus characteristics when the present invention is based on underwater sound time reversal empty, the reverberation of transmission signal during oise insulation factor can be suppressed to measure, reduces reverberation to the interference of measuring-signal, is applicable to solve the difficulties that passive material oise insulation factor under the strong Reverberation of low frequency is measured.
Description
Technical field
The present invention relates to a kind of measuring method of underwater sound passive material acoustical behavior.Underwater sound passive material is widely used in oceanographic engineering, and according to the functional characteristic of component, the acoustical behavior evaluation index of underwater sound passive material comprises insertion loss, echo reduction, oise insulation factor etc.The invention provides a kind of new measuring method of underwater sound passive material sound reduction index/oise insulation factor.
Background technology
Underwater sound passive material uses extensively in underwater sound equipment, has key effect in hydroacoustic electronic warfare field.Along with the progress of material science, viscoelasticity macromolecular material contour performance sound absorption new material is increasingly extensive in the application in field such as Underwater Acoustics Engineering such as sound insulation vibration damping, sqouynd absorption lowering noise etc., is problem in the urgent need to address to the parameters,acoustic measurement of such material in underwater sound environment for use.Meanwhile, in low frequency situation, the acoustic characteristic test of passive material is current underwater acoustic measurement difficult point.According to the functional characteristic of component, the acoustical behavior evaluation index of underwater sound passive material comprises insertion loss, echo reduction, oise insulation factor etc.Measuring method conventional at present has wideband pulse compression method, Reverberation room method, standing-wave-tube method, travelling-wave tube method etc.But, affect by the decline of limited-space environment sound absorbing capabilities, the increase of launching beam width etc. in low frequency situation, the reverberation of hydrophone recordings during measurement is strengthened, in addition, the useful test signal of hydrophone recordings affects from test material distance, test material sound absorbing capabilities etc. by nautical receiving set, signal intensity is lower under normal circumstances, finally causes signal significantly to reduce with the ratio of reverberation, the measuring error of prior art is increased greatly.Therefore, research letter is mixed than raising method, develops and has become problem in the urgent need to address at present in medium and low frequency section blanket passive material acoustical behavior measuring technique.
Summary of the invention
The present invention will solve the above-mentioned shortcoming of prior art, anti-when providing underwater sound passive material oise insulation factor under a kind of limited space conditions focuses on measuring method.
Time reversal (time anti-) focusing principle is according to the time anti-unchangeability and transmitting-receiving reciprocity of Solution of Wave Equations, by the Received signal strength of a certain sound source is instead launched afterwards when same channel, can be realized this transmit and to focus at sound source place room and time, namely spatially multipath sound wave arrives in emissive source place, the multipath sound wave that on time, these arrive is by cophase stacking, and the signal after focusing is former form time reversal transmitted.Due in sound field constant time, Solution of Wave Equations time anti-unchangeability and transmitting-receiving reciprocity set up, because of the inherent characteristic of not variable field when now anti-focusing is.Time current, anti-focusing technology has been applied to the measurement of insertion loss/transmission coefficient and echo reduction/reflection coefficient, anti-when the present invention proposes underwater sound passive material oise insulation factor under a kind of limited space conditions focuses on measuring method.Time anti-empty time focus characteristics make measurement Received signal strength be compressed into the former time anti-form transmitted, originally belonging to the interference cophase stacking of reverberation in through incident wave, become available signal, thus significantly improve the mixed ratio of measurement letter, improve the measuring accuracy of underwater sound passive material oise insulation factor, the test especially for medium and low frequency section isolates sound amount is with the obvious advantage.
The technical scheme that the present invention adopts for its technical matters of solution is:
Anti-during underwater sound passive material oise insulation factor under a kind of limited space conditions focus on measuring method, described passive material oise insulation factor measuring method comprises the following steps:
1) instead to transmit when generating: first, according to the frequency range of required measurement, generate the required signal launched by measuring system, as the pulse cosine signal of wideband correlation or arrowband; Then, be placed in by receiving hydrophone near test sample to be placed, transmitting transducer battle array controls through multichannel analog emission coefficient, and each array element respective channel transmits successively independently, and each array element that nautical receiving set records environmental dissemination after tested successively transmits; The Received signal strength utilizing computing machine corresponding to each transmission channel carries out that time delay is evened up, amplitude normalization and time reversal, anti-during generation transmits;
2) without the collection of focus signal during test sample: launch paroxysm and penetrate by 1) produce time instead to transmit, the hydrophone recordings near sample is without signal p during test sample
r+i+ri, comprise direct signal p
i, the p of tank body surrounding reflected signal
rand tank body top reflective signal p
ri;
3) have the collection of transmission focusing signal during test sample: position passive material sample to be measured being put into setting in advance, launch battle array and again launch by 1) produce time instead to transmit, the hydrophone recordings near sample has signal p during test sample
t r+i+ri, the signal gathered when wherein subscript t indicates sample is transmission signal;
4) calculating of oise insulation factor: according to sampled signal p during nothing test sample
r+i+riand sampled signal p when having a test sample
t r+i+ri, calculating acoustical reduction coefficient is
By the relational expression of acoustical reduction coefficient and oise insulation factor, obtaining oise insulation factor is
GL＝-20lg|τ
p|
5) correction of oise insulation factor: for make the present invention to survey the result of oise insulation factor consistent with traditional free field method measurement result, the required condition met of measuring system carries out directional reception for utilizing vector hydrophone or multiple scalar nautical receiving set to signal.
Technical conceive of the present invention is: utilize each array element of transducer array to transmit successively, nautical receiving set receives the signal through underwater acoustic channel transmission, obtain the channel response of each array element of transducer array to hydrophone position place, and evened up by the time delay of each array element, time reversal and amplitude normalization, anti-during generation to transmit; According to time anti-principle, anti-when utilizing transducer array again to launch generated to transmit, realize focusing on when hydrophone position place empty, thus reduce reverberation to the impact of measuring-signal.Meanwhile, space-focusing also can increase the spatial resolution of sample place incoming signal simultaneously, improves the spatial resolution of measurement parameter.
Compared with existing passive material oise insulation factor measuring method, technical advantage of the present invention is mainly manifested in: based on time the anti-measuring technique focused on can suppress reverberation, reduce reverberation to the interference of measuring-signal, the difficulties that passive material oise insulation factor is measured under the strong Reverberation of low frequency can be solved.
Accompanying drawing explanation
Fig. 1 is when launching designature when paroxysm is penetrated, and lays schematic diagram without each measurement mechanism in test sample situation.
Fig. 2 is when launching designature when paroxysm is penetrated, and under having test sample situation, each measurement mechanism lays schematic diagram.
Fig. 3 is sample oise insulation factor experimental measurements figure.
Fig. 4 is the expanded uncertainty figure of sample oise insulation factor experimental measurements.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
With reference to Fig. 1 ~ Fig. 4, anti-during underwater sound passive material oise insulation factor under a kind of limited space conditions focus on measuring method, test for underwater sound construction material sound insulation property.The embodiment of a whole set of measuring method is as follows:
1) instead to transmit when generating
First, according to the frequency range of required measurement, generate the required signal launched by measuring system, as the pulse cosine signal of wideband correlation or arrowband.Then, be placed in by receiving hydrophone near test sample to be placed, as shown in Figure 1, transmitting transducer battle array controls through multichannel analog emission coefficient, each array element respective channel transmits successively independently, and each array element that nautical receiving set records environmental dissemination after tested successively transmits.The Received signal strength utilizing computing machine corresponding to each transmission channel carries out that time delay is evened up, amplitude normalization and time reversal, anti-during generation transmits.
2) without the collection of focus signal during test sample
As shown in Figure 1, by 1) time counter the transmitting that generate penetrate through launching paroxysm, then according to time anti-principle, transmit when producing empty at nautical receiving set place and focus on, this focus signal is former form time reversal transmitted, Received signal strength p when now hydrophone recordings does not test sample
r+i+ri.
3) collection of transmission focusing signal when testing sample is had
Passive material sample to be measured is put into test position place, as shown in Figure 2, launches battle array and again launch by 1) generate time instead to transmit, hydrophone recordings has Received signal strength p during test sample
t r+i+ri.
4) calculating of oise insulation factor
Utilize the data gathered, calculating acoustical reduction coefficient is
By the relational expression of acoustical reduction coefficient and oise insulation factor, obtaining oise insulation factor is
GL＝-20lg|τ
p|
5) correction of oise insulation factor
Due to the existence of boundary reflection, for making above-mentioned oise insulation factor measurement result consistent with free field situation, need revise measurement result.Propagate as shown in Figure 1 without sample situation sound ray, if twice, interface and the weak output signal that bounces above, can ignore, sound insulation focus signal p
r+i+ricomprise direct signal p
i, head tank boundary reflection signal p
r, and tank body its right end face reflected signal p
ri.Owing to launching battle array and receiving battle array apart from close, reflected signal p
rclose to normal incidence to head tank interface, if receiving hydrophone has Sidelobe Suppression power (being realized by vector hydrophone or multiple scalar nautical receiving set), then boundary reflection signal p
rcan ignore; Tank body its right end face reflected signal p
riα β p can be expressed as
s, wherein α is the amplitude fading factor that signal path transmission loss (TL) causes, and β is interface reflection coefficients on the right side of tank body, p
sfor transmitting.Having in sample situation, sound ray is propagated as shown in Figure 2, sound insulation focus signal p
t r+i+ricomprise through transmission signal p
t i, the p of tank body boundary reflection signal
t rand tank body its right end face reflected signal p
t ri.With similar without sample situation, owing to launching battle array and receiving hydrophone close together, p
t rcan ignore.If free field acoustical reduction coefficient is τ, then p
t i=τ p
i, p
t ri=α β τ p
s.So step 4) in calculate the acoustical reduction coefficient of gained by measurement data and can be expressed as
Namely consistent with free field measurement result.As can be seen from said process, if realize directional reception by vector hydrophone or multiple scalar nautical receiving set, the acoustical reduction coefficient that the present invention's measurement obtains does not need to revise, and corresponding oise insulation factor is also without the need to revising.
Example illustrates: for verifying the validity of this measuring method in passive material acoustical behavior is measured, carried out the large tank verification experimental verification of the finite space.Launching battle array in experiment is that ternary is uniformly distributed ring array, diameter 1.5m, and reception battle array is five-element acoustic array, array element distance 20cm, and two gusts at a distance of about 4m.Sample physical dimension is 1.1m × 1.0m × 5mm, and density is 1.02 × 10
3kg/m
3, velocity of sound 5470m/s.The oise insulation factor data acquisition and processing (DAP) of 0.5kHz-1kHz frequency has been carried out in this test.Fig. 3 display be sample oise insulation factor test findings figure, as seen from the figure, based on time the counter sample oise insulation factor measurement result that focuses on basically identical with Plane wave theory calculated value, the relative error that each measurement frequency is corresponding is all less than 10%.Fig. 4 display be the expanded uncertainty figure of sample oise insulation factor measurement result, as seen from the figure, sample each frequency measurement result expanded uncertainty is all less than 2dB.
Claims (1)
1. anti-during underwater sound passive material oise insulation factor under limited space conditions focus on a measuring method, comprise the following steps:
1) instead to transmit when generating;
First, according to the frequency range of required measurement, generate the required signal launched by measuring system, as the pulse cosine signal of wideband correlation or arrowband; Then, be placed in by receiving hydrophone near test sample to be placed, transmitting transducer battle array controls through multichannel analog emission coefficient, and each array element respective channel transmits successively independently, and each array element that nautical receiving set records environmental dissemination after tested successively transmits; The Received signal strength utilizing computing machine corresponding to each transmission channel carries out that time delay is evened up, amplitude normalization and time reversal, anti-during generation transmits;
2) without the collection of focus signal during test sample;
By step 1) time counter the transmitting that generate penetrate through launching paroxysm, then according to time anti-principle, transmit when producing empty at nautical receiving set place and focus on, this focus signal is former form time reversal transmitted, Received signal strength p when now hydrophone recordings does not test sample
r+i+ri, comprise direct signal p
i, the p of tank body surrounding reflected signal
rand tank body top reflective signal p
ri;
3) collection of transmission focusing signal when testing sample is had;
Passive material sample to be measured is put into test position place, launches battle array and again launch by step 1) generate time instead to transmit, hydrophone recordings has Received signal strength p during test sample
t r+i+ri, the signal gathered when wherein subscript t indicates sample is transmission signal;
4) calculating of oise insulation factor;
Utilize the data gathered, calculating acoustical reduction coefficient is
By the relational expression of acoustical reduction coefficient and oise insulation factor, obtaining oise insulation factor is
GL＝-20lg|τ
p|
5) correction of oise insulation factor: by make the result of survey oise insulation factor consistent with traditional free field method measurement result, the required condition met of measuring system carries out directional reception for utilizing vector hydrophone or multiple scalar nautical receiving set to signal.
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| CN105929384A (en) * | 2016-07-06 | 2016-09-07 | 西北工业大学 | Joint low-sidelobe multi-beam forming method based on cross array transmission and circular array reception |
| CN107976485A (en) * | 2016-10-25 | 2018-05-01 | 费希尔控制产品国际有限公司 | acoustic emission sensor with integrated acoustic generator |
| CN109238441A (en) * | 2018-07-23 | 2019-01-18 | 浙江大学 | It is a kind of based on it is optimal empty when focusing technology acoustic stimulation echo reduce measurement method |
| CN109238440A (en) * | 2018-07-18 | 2019-01-18 | 浙江大学 | The acoustic stimulation insertion loss measurement method of focusing technology when based on optimal sky |
| CN109490425A (en) * | 2018-12-18 | 2019-03-19 | 浙江大学 | A kind of passive material bass reflex coefficient measuring method based on Green's function reconfiguration technique |
| CN109696238A (en) * | 2018-12-03 | 2019-04-30 | 浙江大学 | Underwater sound passive material insertion loss method for automatic measurement applied to pressure noise elimination water pot |
| CN110609085A (en) * | 2019-08-12 | 2019-12-24 | 中国船舶工业系统工程研究院 | Acoustic metamaterial acoustic performance measuring method based on vector hydrophone |
| CN112730626A (en) * | 2021-01-05 | 2021-04-30 | 中国科学院声学研究所 | On-site sound insulation measuring device and method based on vector sensor |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105759256A (en) * | 2016-03-17 | 2016-07-13 | 浙江大学 | Underwater sound projector response time reversal focusing measuring method |
| CN105929384A (en) * | 2016-07-06 | 2016-09-07 | 西北工业大学 | Joint low-sidelobe multi-beam forming method based on cross array transmission and circular array reception |
| CN107976485A (en) * | 2016-10-25 | 2018-05-01 | 费希尔控制产品国际有限公司 | acoustic emission sensor with integrated acoustic generator |
| CN109238440B (en) * | 2018-07-18 | 2020-05-01 | 浙江大学 | Acoustic covering layer insertion loss measurement method based on optimal space-time focusing technology |
| CN109238440A (en) * | 2018-07-18 | 2019-01-18 | 浙江大学 | The acoustic stimulation insertion loss measurement method of focusing technology when based on optimal sky |
| CN109238441A (en) * | 2018-07-23 | 2019-01-18 | 浙江大学 | It is a kind of based on it is optimal empty when focusing technology acoustic stimulation echo reduce measurement method |
| CN109238441B (en) * | 2018-07-23 | 2020-06-09 | 浙江大学 | Acoustic covering layer echo reduction measurement method based on optimal space-time focusing technology |
| CN109696238A (en) * | 2018-12-03 | 2019-04-30 | 浙江大学 | Underwater sound passive material insertion loss method for automatic measurement applied to pressure noise elimination water pot |
| CN109490425B (en) * | 2018-12-18 | 2020-05-19 | 浙江大学 | Passive material low-frequency reflection coefficient measuring method based on Green function reconstruction technology |
| CN109490425A (en) * | 2018-12-18 | 2019-03-19 | 浙江大学 | A kind of passive material bass reflex coefficient measuring method based on Green's function reconfiguration technique |
| CN110609085A (en) * | 2019-08-12 | 2019-12-24 | 中国船舶工业系统工程研究院 | Acoustic metamaterial acoustic performance measuring method based on vector hydrophone |
| CN110609085B (en) * | 2019-08-12 | 2022-06-10 | 中国船舶工业系统工程研究院 | Acoustic metamaterial acoustic performance measuring method based on vector hydrophone |
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