基于EMD分解的测量误差分离方法研究

Measurement error separation method based on EMD

振动测试可以通过位移信号一次求导、二次求导得到振动信号的速度、加速度。针对位移信号求导过程存在使原始信号中误差放大的问题,该文将EMD经验模态分解方法应用到振动测试中,有效地从位移信号中分离出系统误差和随机误差,减小求导后速度、加速度信号中的误差信号,并通过仿真和实验验证该方法的有效性。

Vibration speed and acceleration can be obtained from the first and second derivatives of displacement signal respectively. However, there is a problem of error enlargement in the derivation of displacement signal. This paper applied EMD decomposition method to vibration test, which can separate system and random errors from the displacement signal effectively. Simulation results and experimental results verified the effectiveness of this method.