Abstract. The performance of bandwidth and transmitting voltage response to the piezoelectric dual-excited underwater acoustic transducer are studied by FEM software ANSYS in the paper. At first, the mechanism of the dual-excited transducer is analyzed, once this is done, The FEM models with different axial dimension of the piezoelectric stack and the mid mass, Al and steel are specified for the material of mid mass respectively. the calculated curves are contrasted, the results were found that the appropriate proportion of the mid-mass to the stack will broaden the bandwidth and enhance the transmitting voltage response, the increase of the thickness of the mid-mass will reduce the transmitting voltage response, and the bandwidth can be expanded to 13kHz, the resonance frequency has shifted to a higher value, it ranges from 34kHz to 46kHz. The results show that one octave bandwidth could be achieved and provide support for the next production and experiment of the broadband underwater acoustic transducer.
Abstract. To overcome the non-uniqueness of solution at eigenfrequencies in the boundary integral equation method for structural acoustic radiation, wave superposition method is introduced to study the acoustics characteristics including acoustic field reconstruction and sound power calculation. The numerical method is implemented by using the acoustic field from a series of virtual sources which are collocated near the boundary surface to replace the acoustic field of the radiator, namely the principle of equivalent. How to collocate these equivalent sources is not indicated definitely. Once wave superposition method is applied to sound power calculation, it is necessary to evaluate its accuracy and impact factors. In the paper, the basic principle of wave superposition method is described, and then the integral equation is discretized. Also, the impact factors including element numbers, frequency limitation, and distance between virtual source and integral surface are analyzed in the process of calculate the acoustic radiation from the simply supported thin plate under concentrated force. The extensive measures of acoustic field at the thin plate are compared with results obtain using different numerical methods. The results show that: (a) The agreement between the results from the above numerical methods is excellent. The wave superposition method requires fewer elements and hence is faster. But the extensive numerical modeling suggests that as long as 1 ka ≤ the volume velocity matching yields more than adequate accuracy. (b) The equivalent sources should be collocated inside the radiator. And the accuracy of a given Gauss integration formula will decrease as the source approaches the boundary surface. (c) The numerical method is applicable to the acoustic radiation of structure with complicated shape. (d) The method described in this paper can be used to perform effectively sound power calculation, and its application range can be extended on the basis of these conclusions.
The single array element of cymbal transducer has a low transmitting power, poor directivity and narrow bandwidth, which however can be improved, even overcome by array forming. First of all, 9 cymbal transducer array elements were designed and made on the basis of the research results obtained in the early stage, and were assembled into a 3x3 array by using a set of stable and reliable array forming techniques developed from the research. The array was shaped by casting with organic silica-gel and then getting cured. The array was tested in air for resonance frequency and equivalent circuit parameters demonstrating the stability of array forming techniques. The array and a single array element were also tested in anechoic water-tank for transmitting, receiving and directivity performances, and the result indicates that, the array forming by elements can strengthen the transmitting power and improve the directivity effect, but may reduce the free-field receiving sensitivity. The research has a great significance to the development of a new super multi-element cymbal array.
Suspension system of a co-vibrating vector hydrophone need be designed carefully to reach the requirement of underwater acoustic measurement. Condition of vibration sensing of co-vibrating vector hydrophone is researched separately based on acoustic theory and mechanical vibration theory. A co-vibrating vector hydrophone with central fixed structure had been analyzed. The simplified model and equivalent circuit model of the proposed design were built for the analysis. The voltage response of the hydrophone to acoustic particle velocity is derived, and improvement of voltage sensitivity based on cymbal transducer is performed. Simulation result shows the design of vector hydrophone with central fixed structure can satisfied the requirements of acoustic measurement, and cymbal transducer can improve the response voltage sensitivity further.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.