A kind of wide-beam broad-band longitudinal vibration transducer with a baffle plate
Author(s): TANG Shao-bo, ZHAO Rong-rong, TIAN Hui, OUYANG Xun, ZHAO Hui, Shanghai Marine Electronic Equipment Research Institute, Science and Technology on Underwater Acoustic Antagonizing Laboratory
Pages: 184-188
Year: 2014 Issue: 2
Journal: Technical Acoustics
Keyword: broad-band; wide-beam; baffleplate; longitudinal transducer;
Abstract: In this paper, a kind of wide-beam broad-band longitudinal vibration transducers with a baffle plate is introduced. By the effective coupling of the longitudinal mode caused by the whole transducer and the flexural mode caused by the head mass, the transducer shows a broad-band performance. Furthermore, the conception of utilizing baffle plate boundary structure to realize the wide-beam of the transducer is put forward. On the basis of FEM software, the transducer electro-acoustic capability is analyzed. The FEM analysis result indicates that the band-width is effectively extended by using the two modes coupling method and the directivity of the transducer can be controlled by adjusting the distance between the baffle plate and the radiating head mass, so that it shows a wide-beam performance. The transducer is manufactured and measured in different conditions. From the experiment result, the fluctuation of the transmitting voltage response of the transducer in the operation frequency band does not exceed 3 dB. At the frequencies of 11kHz, 12kHz, 13kHz, and 14kHz, the-3dB beam-width of the transducer reaches 130~160 degree.
Pages: 184-188
Year: 2014 Issue: 2
Journal: Technical Acoustics
Keyword: broad-band; wide-beam; baffleplate; longitudinal transducer;
Abstract: In this paper, a kind of wide-beam broad-band longitudinal vibration transducers with a baffle plate is introduced. By the effective coupling of the longitudinal mode caused by the whole transducer and the flexural mode caused by the head mass, the transducer shows a broad-band performance. Furthermore, the conception of utilizing baffle plate boundary structure to realize the wide-beam of the transducer is put forward. On the basis of FEM software, the transducer electro-acoustic capability is analyzed. The FEM analysis result indicates that the band-width is effectively extended by using the two modes coupling method and the directivity of the transducer can be controlled by adjusting the distance between the baffle plate and the radiating head mass, so that it shows a wide-beam performance. The transducer is manufactured and measured in different conditions. From the experiment result, the fluctuation of the transmitting voltage response of the transducer in the operation frequency band does not exceed 3 dB. At the frequencies of 11kHz, 12kHz, 13kHz, and 14kHz, the-3dB beam-width of the transducer reaches 130~160 degree.
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