传递函数在振动检测中的应用研究

Application study of transfer function in vibrating detection

振动试验系统是振动与冲击环境试验的主要设备,对整个试验系统进行模态参数识别是开展振动控制技术研究的必要环节。通过建立振动试验系统的动力学-电学耦合模型和动力学模型,推导出了传递函数的数学计算模型,并通过对传递函数进行傅里叶变换分析识别出振动系统的模态参数。为了验证方法的准确性和有效性,通过获取振动系统的实测传递函数来识别系统的工作模态参数,并与理论计算值进行比对。试验结果与理论计算结果具有一致性。

The testing system of vibration is the mainly equipment for vibration and shock environmental test and its model parameters identification are necessary procedures for conducting study on vibration control technology.Based on a dynamic-electrical couplied model and dynamics model of testing system,a mathematical model of transfer function,which used for indentifying model parameters of vibration system by Fourier transform,was deduced.In order to verifying the accuracy and effectiveness of this method,this article was compared the measured value,which indentified by measured transfer function curve,with the theoretical calculation value.The result is consistency.