阻尼比求解的半功率带宽法和时域衰减法对比研究

Comparative Study of Half-power Bandwidth Method and Time-domain Attenuation Method for Damping Ratio Solution

准确测量阻尼比对振动控制具有重要意义,半功率带宽法和时域衰减法是最常用的阻尼比求解方法。基于锤击试验对2种阻尼比求解方法进行比较,分析各自的特点,结果表明:时域衰减法具有较高精确度;分辨率越高,二者的计算精度越高,结果也越一致;半功率带宽法的计算精度与共振峰位置有关,共振频率较低时,误差较大。研究结果为工程应用提供有效参考。

Accurate measurement of damping ratio is of great importance to vibration control.Half-power bandwidth method and time-domain attenuation method are the most commonly used for solving damping ratio.Based on hammering test,this paper compares the two methods to solve the damping ratio,and analyzes their respective characteristics.The results show that the timedomain attenuation method has higher accuracy;the higher the resolution,the higher the accuracy of the two methods,the more consistent the results are;the accuracy of the half-power bandwidth method is related to the position of the resonance peak,and the error is larger when the resonance frequency is low.The research results provide an effective reference for engineering application.