圆形波导杆中两种情况下声信号的传播特性

Propagation Characteristics of Acoustic Signal in the Circle Waveguide Rod of Two Conditions

选取了7种不同直径的圆钢波导杆,分别在波导杆的端面圆心和圆周表面上进行断铅声信号实验。重点分析了直径为10 mm波导杆在长度为2.5 m、1.0 m时的实验数据,分析了波导杆直径和长度的变化对其所传递声信号的纵波分离、幅值、上升时间、持续时间及信号强度的影响。总结了7种不同直径的波导杆在不同长度下声信号的纵波分离和幅值的变化特点,提出了在实际应用中波导杆直径和长度的选取原则。分析了波导杆传递的信号时域图,计算了声信号在波导杆传播中的纵波和横波速度,提出了解决因声速变化而引起信号源定位误差的措施。

The steel waveguide rods with 7 different diameters were investigated.The lead-break signals were collected in the center of the end surface and circumferential surface separately.The signals were analyzed for the rods of 10 mm diameter with 2.5 m and 1.0 m length.The effects of signal separation of longitudinal wave,amplitude,rise time,duration and signal strength were analyzed.The features of the rods for the separation of longitudinal wave and their amplitudes of 7 different diameters with different lengths were summarized.A principle of selecting the diameter and length was proposed.A time-domain map of the signals transferred by the waveguide rod was analyzed.The speed of the longitudinal waves and transverse waves of acoustic signals propagating in the waveguide rod was calculated.A method to avoid the signal positioning error caused by the changes of signal speeds was proposed.