Affiliation:
1. Acoustic Science and Technology Laboratory, Harbin Engineering University , Harbin, 150001, China
Abstract
Type IV flextensional transducers do not have broadband characteristics due to the deep valley between their first- and second-order response curves arising from the sound pressure cancellation produced by the vibration in different areas of the shell. In this paper, the cause of the deep valley is examined by analyzing the equivalent radiated sound field of the transducer. Simplifying the three-dimensional vibration equation to a two-dimensional equation shows that the vibration state of the shell is related to the positive and negative curvature. Therefore, a variable-shell flextensional transducer with a negative curvature is proposed, which changes the second-order vibration of the transducer by introducing a negative curvature structure. The transducer avoids acoustic pressure cancellation, achieves broadband characteristics, and has continuous high efficiency in the frequency band. After optimization, a prototype of the transducer is fabricated and a pool test is completed. The test results show that the transducer realizes the coupling of the first three vibration mode, forming a broad band with an in-band fluctuation of less than 8 dB at 1200–5600 Hz, and the efficiencies of the first to third resonance peaks are 30.2%, 16.6%, and 9.4%, respectively.
Funder
National Nature Science Foundation of China
Publisher
Acoustical Society of America (ASA)
Subject
Acoustics and Ultrasonics,Arts and Humanities (miscellaneous)
Reference20 articles.
1. W. J. Toulis, “Flexural-extensional electromechanical transducer,” U.S. Patent 3,277,433 (20 September 1966).
2. Advances in flextensional transducer design,1979
3. Frequency fine-tuning in Class IV flextensional transducers;Appl. Acoust.,2007
4. Directional flextensional transducer;J. Acoust. Soc. Am.,1989
5. Design of low-frequency broadband flextensional transducers based on combined particle swarm optimization and finite element method;Smart Mater. Struct.,2021
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献