矩形横截面耦合振动复合变幅杆的设计

The design of large-dimension rectangular horns

本文研究由一部分变截面杆和一部分定截面杆构成的大尺寸矩形横截面复合变幅杆。文章中引进了变幅杆各轴向的等效弹性常数，并推出了具体表达式，利用表观弹性法探讨了大尺寸矩形变幅杆的耦合振动，得出了变幅杆的共振条件，即频率方程。实验表明，与一维理论的计算结果相比，利用耦合振动理论得出的变幅杆的共振频率更加接近于实测值。

In this paper, the design of large-dimension rectangular horns consisted of twosections was studied, the cross section of one section keeps constant,the other varies according to the law of exponential, conical and catenoidal curves. By introducing. the apparent elasticity constants, we analyzed the coupled vibration of this kind of horns, denyed out the frequency equation. The measured results of the, resonant frequency of horns show that the calculated results of frequency by coupled vibration theory are neater to the measured ones than those by one-dimentioal vibration theory.