| 刘望生,俞宏沛,周利生.具有连续纵向激励模态宽带水声换能器研究[J].,2007,26(5):257-261 |
| 具有连续纵向激励模态宽带水声换能器研究 |
| Broadband underwater transducer with continuous longitudinal excited modes |
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| 中文摘要: |
| 分析了连续纵向激励模态拓宽频带的机理。采用单侧激励,可同时激励奇次模态和偶次模态,利用有限元方法研究了这些模态在水中随几何尺寸变化的规律,通过优化设计制作了接近两个倍频程的宽带换能器样品,其工作带宽为12kHz～44kHz,频带内的起伏为±4.3dB。为进一步减少带宽内响应起伏的大小,通过对模态节点间增加质量钢块以及对后盖板采用机械阻抗匹配腔的方式,制作了工作带宽为12kHz～34kHz,频带内的起伏为±3.7dB的宽带换能器样品。 |
| 英文摘要: |
| The band widening theory of continuous longitudinal excited modes is an- alyzed.Both odd modes and even modes can be excited simultaneously by one-sided exciting.Relation between modes and their geometrical sizes in water are studied using FEM(finite element method).A nearly two octaves transducer is designed by optimiz- ing its geometrical size,with bandwidth from 12kHz to 44kHz and the TVR fluctuation within bandwidth less than±4.3dB.In order to reduce the fluctuation within the band- width,a broadband transducer with bandwidth 12kHz～34kHz is designed by adding a steel mass between some mode nodes and by adopting a mechanical impedance matching cavity in the back mass,its fluctuation within the bandwidth being now±3.7dB. |
| DOI：10.11684/j.issn.1000-310X.2007.05.001 |
| 中文关键词: 奇次模态 偶次模态 纵向激励 宽带 |
| 英文关键词: Odd modes Even modes Longitudinal excited Broadband |
| 基金项目: |
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