一种镶拼圆环换能器宽频带应用研究  

Application of Broad Bandwidth to Mosaic Transducer

作　　者：宋哲[1] 严由嵘 SONG Zhe;YAN You-rong(The 705th Research Institute,China Shipbuilding Industry Corporation,Xi’an 710077,China;Science and Technology on Underwater Information and Control Laboratory,Xi’an 710077,China)

机构地区：[1]中国船舶重工集团公司第705研究所,陕西西安710077 [2]水下信息与控制重点实验室,陕西西安710077

出　　处：《水下无人系统学报》2018年第5期498-502,共5页Journal of Unmanned Undersea Systems

摘　　要：为了实现小口径无人水下航行器(UUV)的低频声发射,进一步降低发射换能器在航行器中的体积、质量占比、拓宽换能器可用频带,研究了一种适用于小型UUV的薄壁镶拼圆环换能器。考虑小型UUV对换能器尺寸、质量的限制,通过理论公式与有限元软件ANSYS相结合的方法,分析了镶拼圆环高度参数变化对换能器电声性能的影响;合理设计了圆环高度,实现了圆环径向呼吸振动模态与高度方向弯曲振动模态耦合,达到了拓宽频带的目的。采用薄壁设计以降低质量及空间占用,并通过模态分析阐述了该换能器在谐振频率以下频带内的振动形式及声性能特点。根据仿真优化结果,制作了换能器样机。经测试,换能器在5.5～33 kHz工作频段内,发送电压响应带内起伏约为±4 dB,仿真与实际测试结果基本吻合。带内声源级大于173 dB;低频段500 Hz～1 kHz频带内声源级大于144 dB,具备一定的低频声发射性能。文中工作可为实现小口径UUV换能器的低频、宽频带声发射提供参考。To realize low-frequency acoustic emission of small caliber underwater unmanned vehicle(UUV),further reduce the volume and mass proportion of a transducer in the UUV,and widen available frequency band of the transducer,a kind of thin-walled mosaic cylindrical transducer for the UUV was designed.Considering the limitation of the UUV on the transducer's size and mass,the influence of height parameter of the mosaic circular ring on the electroacoustic performance of the transducer was analyzed by combination of the theoretical formula with the finite element software ANSYS.The reasonable design of the ring height can realize the coupling of the radial breathing vibration modal of the circular ring and the bending vibration modal in height direction to widen the frequency band.Thin wall design was adopted to reduce the mass and space occupancy.The vibration form and acoustic performance of the transducer in the frequency band below resonant frequency were analyzed through modal analysis.According to the simulated optimized results,a prototype of the transducer was fabricated.Tests show that in the operating frequency band from 5.5 to 33 kHz,the in-band transmitting voltage response fluctuates between-4 dB and+4 dB approximately,which is basically consistent with the simulation results.The in-band sound source level is greater than 173 dB,while in the lower frequency band from 500 Hz to 1 kHz the sound source level is higher than 144 dB,indicating a certain low-frequency acoustic emission performance.This work may provide a reference for realizing low-frequency and wide-band acoustic emission of small caliber UUV transducer.

关 键 词：水下无人航行器 镶拼圆环换能器 宽频带 

分 类 号：TJ6[兵器科学与技术—武器系统与运用工程] TB556[理学—物理]