振动信号频域积分的滤波修正算法

Filtering modification of vibration signal integration algorism

机械故障诊断中,通过振动信号的软件积分可以实现振动加速度、速度信号向位移信号的转换。为了消除信号中噪声对软件积分结果的影响,分析了软件积分在振动信号积分中趋势项产生的原因,提出了基于传感器低频滤波与阀值滤波修正的频域积分算法。方法简单实用,消除了软件积分结果中的摆动趋势。数值仿真结果与实测结果表明,方法抗噪声能力强,具有很好的精度和通用性,目前已经应用于旋转机械状态监测与故障诊断系统中,为判断机组运行状态提供了很好的依据。

Vibration signal of acceleration and velocity can be transferred into vibration signal of displacement with software integration algorithm in machinery fault diagnosis. In order to eliminate the affection of noise in software integration,the reasons causing trend term of integration results are analyzed and a frequency domain integration algorithm based on transducer low frequency filtering and threshold filtering is introduced. It is a simple and effective method,can remove swinging trend term of the integra- tion results. Numerical simulation results and test results show that this method has good precision for the vibration analysis and it has been used in the on-line condition monitoring and fault diagnosis system for the rotating machinery,and provided accurate data and information for estimating the running condition.