文章摘要
李娜,贺西平.矩形板辐射体弯曲振动的轴向声场计算[J].声学技术,2020,39(6):655~659
矩形板辐射体弯曲振动的轴向声场计算
Calculation of the axial acoustic field of bending vibration of rectangular plate radiator
投稿时间:2020-04-12  修订日期:2020-09-10
DOI:10.16300/j.cnki.1000-3630.2020.06.001
中文关键词: 矩形平板辐射体  阶梯矩形板辐射体  轴向声压  轴向距离  输入功率
英文关键词: flat rectangular plate radiator  stepped rectangular plate radiator  axial pressure  axial distance  input power
基金项目:国家自然科学基金资助项目(11774211)、宁夏医科大学校级项目(XT2020004)
作者单位E-mail
李娜 陕西师范大学物理学与信息技术学院, 陕西西安 710119
宁夏医科大学理学院, 宁夏银川 750004 
 
贺西平 陕西师范大学物理学与信息技术学院, 陕西西安 710119 Hexiping@snnu.edu.cn 
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中文摘要:
      文章利用数值计算结合有限元方法,推导了一种计算自由边界条件下弯曲振动矩形板辐射体近远场轴向声压的方法。以算例中的矩形平板辐射体和阶梯矩形板辐射体为例,分别计算了其轴向声压并进一步进行了实测。最后,测试了声压与施加在激励换能器上的输入功率之间的关系。结果表明:在辐射体近场区域内,轴向声压随距离的增大有较大的起伏,近场多次出现声压极大值与极小值;在远场区域声压随距离的增加而缓慢衰减。输入功率不同时,辐射体轴向声压随距离变化的趋势相同,进一步说明所述计算方法的正确性。
英文摘要:
      In this paper, the theoretical method of calculating the axial radiation sound pressure of rectangular plate bending vibration under free boundary condition is deduced by using the numerical calculation and finite element method. This method can not only calculate the axial radiation pressure for a single flat rectangular plate radiator, but also for the stepped rectangular plate radiator. Taking the single flat rectangular plate radiator and a stepped one as examples, the variation of the axial pressure with the axial distance is calculated and tested. In addition, the relationship between the axial pressure and the input power applied to the transducer is also tested. It shows that in the near field of the radiator, the axial pressure fluctuates significantly with the increase of distance, and the maximum and minimum values of the sound pressure appear repeatedly; in the far field of the radiator, the sound pressure decreases slowly with the increase of distance; for different input powers, the variation trend of the axial pressure with the distance is the same, which further proves the correctness of the calculation method described in this paper.
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