At present, dispersion curves are usually extracted through temporal-spatial analysis methods. To obtain more dispersion information relating to waveguides, the F-K transform is introduced in this paper. Based on Normal Mode theory, the feasibility analysis of the F-K transform employed in dispersion extraction has been provided with deduction and numerical simulation at first. Then, an anechoic tank measurement based on scale model has been carried out so as to demonstrate the research mentioned above, while at the same time the validity of the scale model applied to sound propagation has also been proved by normal mode theory. As for the accuracy and efficiency of measurement, they are further verified by the agreement between the numerical simulation and the analysis results of the measured data.
{"title":"The study of Normal Modes dispersion extraction based on F-K transform","authors":"Zhu Han-hao, Zheng Hong, Tang Yun-Feng, Piao Sheng-chun, Zhang Hai-gang","doi":"10.1109/COA.2016.7535731","DOIUrl":"https://doi.org/10.1109/COA.2016.7535731","url":null,"abstract":"At present, dispersion curves are usually extracted through temporal-spatial analysis methods. To obtain more dispersion information relating to waveguides, the F-K transform is introduced in this paper. Based on Normal Mode theory, the feasibility analysis of the F-K transform employed in dispersion extraction has been provided with deduction and numerical simulation at first. Then, an anechoic tank measurement based on scale model has been carried out so as to demonstrate the research mentioned above, while at the same time the validity of the scale model applied to sound propagation has also been proved by normal mode theory. As for the accuracy and efficiency of measurement, they are further verified by the agreement between the numerical simulation and the analysis results of the measured data.","PeriodicalId":155481,"journal":{"name":"2016 IEEE/OES China Ocean Acoustics (COA)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133030462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/COA.2016.7535656
Zhou Tianfang, Lan Yu, Lu Wei
The bender disc transducer is a kind of low frequency sound source which is widely used in the sonobuoy and disposable underwater acoustic countermeasure equipment. It has the characteristics of low frequency, small size, simple structure and is light in weight. Traditional bender disc transducers with a cavity structure are not suitable in deep water resistance. In order to solve this problem, a free flooded structure is used in the bender disc transducer-which has a hole opening around the ring cavity structure without changing the external volume of the transducer. The water can thus enter the transducer, which greatly improves traditional bender disc transducer performance in deep water resistance. The acoustic properties of the deep water bender disc transducer are analyzed by using ANSYS finite element software The influences of its structural dimensions on the transducer resonant frequency and on the maximum transmitting voltage response are calculated. On the basis of the analysis, the structural parameters of the prototype transducer are determined and the performances of a virtual transducer are simulated and calculated. Finally, according to the simulation results of the software, the bender disc transducer is processed and manufactured. In conclusion its properties are tested. By the prototype performance test of the bender disk transducer, it is known that the resonant frequency is 5590Hz in air; the resonance frequency is 2000Hz in water; the radial maximum transmitting voltage response level(TVR} is 113.9dB (//μPa-m); and, the -3dB bandwidth of the transmitting voltage response curve can cover 1.9kHz to 2.2kHz. The axial maximum transmitting voltage response level is 115.8dB (//μPa-m); and, the -3dB bandwidth of the transmitting voltage response curve can cover 1.9kHz to 204kHz.
{"title":"A study of deepwater bender disk transducer","authors":"Zhou Tianfang, Lan Yu, Lu Wei","doi":"10.1109/COA.2016.7535656","DOIUrl":"https://doi.org/10.1109/COA.2016.7535656","url":null,"abstract":"The bender disc transducer is a kind of low frequency sound source which is widely used in the sonobuoy and disposable underwater acoustic countermeasure equipment. It has the characteristics of low frequency, small size, simple structure and is light in weight. Traditional bender disc transducers with a cavity structure are not suitable in deep water resistance. In order to solve this problem, a free flooded structure is used in the bender disc transducer-which has a hole opening around the ring cavity structure without changing the external volume of the transducer. The water can thus enter the transducer, which greatly improves traditional bender disc transducer performance in deep water resistance. The acoustic properties of the deep water bender disc transducer are analyzed by using ANSYS finite element software The influences of its structural dimensions on the transducer resonant frequency and on the maximum transmitting voltage response are calculated. On the basis of the analysis, the structural parameters of the prototype transducer are determined and the performances of a virtual transducer are simulated and calculated. Finally, according to the simulation results of the software, the bender disc transducer is processed and manufactured. In conclusion its properties are tested. By the prototype performance test of the bender disk transducer, it is known that the resonant frequency is 5590Hz in air; the resonance frequency is 2000Hz in water; the radial maximum transmitting voltage response level(TVR} is 113.9dB (//μPa-m); and, the -3dB bandwidth of the transmitting voltage response curve can cover 1.9kHz to 2.2kHz. The axial maximum transmitting voltage response level is 115.8dB (//μPa-m); and, the -3dB bandwidth of the transmitting voltage response curve can cover 1.9kHz to 204kHz.","PeriodicalId":155481,"journal":{"name":"2016 IEEE/OES China Ocean Acoustics (COA)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122048112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/COA.2016.7535835
Zhang Wen, Zeng Xinwu, Gong Changchao, Zhao Yun
This paper deal with the precision of underwater acoustic source localization using five-element plane cross array observation platform. The influence of three kinds of errors, namely the time delay estimation error, the array size installation error, and the sound velocity measurement error, on the localization precision, which includes direction and distance precision, are analyzed and simulated.
{"title":"Precision analysis of underwater acoustic source localization using five-element plane cross array","authors":"Zhang Wen, Zeng Xinwu, Gong Changchao, Zhao Yun","doi":"10.1109/COA.2016.7535835","DOIUrl":"https://doi.org/10.1109/COA.2016.7535835","url":null,"abstract":"This paper deal with the precision of underwater acoustic source localization using five-element plane cross array observation platform. The influence of three kinds of errors, namely the time delay estimation error, the array size installation error, and the sound velocity measurement error, on the localization precision, which includes direction and distance precision, are analyzed and simulated.","PeriodicalId":155481,"journal":{"name":"2016 IEEE/OES China Ocean Acoustics (COA)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128368842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.1109/COA.2016.7535801
Li Zhi, Cheng Hongjuan, Z. Hu, W. Wenzhi, Zhao Tianji, T. Le
Acoustic intensity is one of the most important quantities in underwater acoustics. The conventional way of obtaining the acoustic intensity is by using two microphones as an intensity probe. However, the finite difference approximation will bring errors to the intensity calculation. Moreover, few publications mention instrumentation for measuring underwater acoustic intensity, in spite of intensity measurements being more meaningful for underwater usage. The instrumentation for measuring underwater acoustic intensity is presented in this paper: the intensity probe is a pressure-acceleration based vector hydrophone from which the particle velocity can be obtained directly. Therefore, the errors due to finite difference approximation will be eliminated by using the vector hydrophone. To test the instrumentation, the acoustic intensity is measured in a standing wave tube. To measure the self-noise of the intensity probe, a facility called Self-Noise Evaluation System is also presented in this paper.
{"title":"Instrumentation for underwater acoustic intensity measurement","authors":"Li Zhi, Cheng Hongjuan, Z. Hu, W. Wenzhi, Zhao Tianji, T. Le","doi":"10.1109/COA.2016.7535801","DOIUrl":"https://doi.org/10.1109/COA.2016.7535801","url":null,"abstract":"Acoustic intensity is one of the most important quantities in underwater acoustics. The conventional way of obtaining the acoustic intensity is by using two microphones as an intensity probe. However, the finite difference approximation will bring errors to the intensity calculation. Moreover, few publications mention instrumentation for measuring underwater acoustic intensity, in spite of intensity measurements being more meaningful for underwater usage. The instrumentation for measuring underwater acoustic intensity is presented in this paper: the intensity probe is a pressure-acceleration based vector hydrophone from which the particle velocity can be obtained directly. Therefore, the errors due to finite difference approximation will be eliminated by using the vector hydrophone. To test the instrumentation, the acoustic intensity is measured in a standing wave tube. To measure the self-noise of the intensity probe, a facility called Self-Noise Evaluation System is also presented in this paper.","PeriodicalId":155481,"journal":{"name":"2016 IEEE/OES China Ocean Acoustics (COA)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127527816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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