Cymbal-Based Piezocomposite Smart Material for Active Echo Control of Underwater target
A low frequency broadband submarine smart material based on planar Cymbal transducers array was built and tested.Each Cymbal transducers consist of a piezoelectric ceramics disk (PZT-4,1mm thick) sandwiched between two brass end caps.The caps contain a shallow cavity on their inner surface.The presence of the cavities allows the caps to be used as a mechanical transformer,which transforms the high impedance,small extensional motion of the ceramic into low impedance,large flexural motion of the shell.This structure is a small Class V flextensional transducer.Compared to the traditional flextensional transducers,which have a complicated design,are usually assembled by hand and expensive,the fabrication process of the Cymbal is very simple,easy and inexpensive to mass-produce.The performances of three diameters Cymbal transducer were analyzed using the finite element method.The performance of three different Cymbal transducer-based underwater smart material designs are compared.One smart material design is an 9 round array of Cymbal transducer units,and the other two smart material design is an 9 rectangular array of Cymbal transducer units.All of the smart material as used to drive a stiff cover plate in a panel configuration.The radiation surface of the first smart material array cymbal actuator is a (O)100 mm round face.The other two smart materials have radiating area of 110mm× 110mm and a thickness of less than 20 mm.The measured transmitting voltage response (TVR) of smart material was above 130 dB re lμPa/V@1m and fiat over the frequency range of 3-15 kHz.It was shown that the smart material built of an array of Cymbal transducers are thin,low frequency,broadband and can be used as a high power submarine actuator with a working frequency below 10kHz.The TVR of the thin panel actuator was 20dB higher than 1-3 piezocomposite material which with same size.This actuator act as active sound absorption devices can attenuating acoustic reflection of underwater target effectively.
Piezocomposites smart material cymbal transducer unit
Tang Jun Wang Tongqing
Fluid and Acoustical Engineering Laboratory, Beijing University of Aeronautics and Astronautics, Beijing 100191,China
国际会议
上海
英文
8-8
2012-10-19（万方平台首次上网日期，不代表论文的发表时间）