基于EMD分解的測量誤差分離方法研究
摘 要：振動測試可以通過位移信號一次求導、二次求導得到振動信號的速度、加速度。針對位移信號求導過程存在使原始信號中誤差放大的問題，該文將EMD經驗模態分解方法應用到振動測試中，有效地從位移信號中分離出系統誤差和隨機誤差，減小求導后速度、加速度信號中的誤差信號，并通過仿真和實驗驗證該方法的有效性。
關鍵詞：經驗模態分解；振動測試；測量誤差；誤差分離
中圖分類號：O241.1；TM930.115；TB53；O241.1 文獻標志碼：A 文章編號：1674-5124（2013）05-0011-05
Measurement error separation method based on EMD
WANG Wei1， CHEN Hai-long1， LIU Yu-peng2
（1. Ordnance Engineering College，Shijiazhuang 050003，China；
2. Shenyang Military Representative Office in 127 Factory，Qiqihar 161000，China）
Abstract: 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.
Key words: EMD； vibration test； measurement error； error separation
