摘要
提出了一种纵向换能器与Ⅳ型弯张换能器相结合的复合型换能器,推导了换能器的等效电路,根据等效电路分析了纵向换能器和弯张换能器之间的耦合作用;应用有限元方法进行了结构优化,使换能器能够发射较高频率声波的同时兼顾低频发射。研制了宽带复合型换能器实验样机,对在声管中所建立的驻波声场特性进行了实验研究,并成功利用该脉冲声管系统进行了声学材料样品的吸声系数测试。通过测试,该换能器可以满足宽频带声学材料测试要求,适用的频率范围为1.4kHz～23kHz。
A wideband transducer for sound tube system is presented in this paper,which combines longitudinal transducer and ClassⅣflexural transducer to improve the performance at low frequency and broaden the working band.The equivalent electrical circuit is obtained by which the coupling between longitudinal transducer and flexural transducer is analyzed.A prototype is fabricated after analyzing the electro-acoustic performances by Finite Element Method.The standing wave in the sound tube stimulated by this transducer has been studied and the absorbing coefficients of two samples of acoustic materials are measured using this sound tube,which shows that the transducer can meet the requirements of measuring acoustic materials,especially with the wide working band ranging from 1.4 kHz to 23 kHz.
出处
《声学学报》
EI
CSCD
北大核心
2011年第4期363-368,共6页
Acta Acustica
