基于EMD分解的測(cè)量誤差分離方法研究
摘 要：振動(dòng)測(cè)試可以通過(guò)位移信號(hào)一次求導(dǎo)、二次求導(dǎo)得到振動(dòng)信號(hào)的速度、加速度。針對(duì)位移信號(hào)求導(dǎo)過(guò)程存在使原始信號(hào)中誤差放大的問(wèn)題，該文將EMD經(jīng)驗(yàn)?zāi)B(tài)分解方法應(yīng)用到振動(dòng)測(cè)試中，有效地從位移信號(hào)中分離出系統(tǒng)誤差和隨機(jī)誤差，減小求導(dǎo)后速度、加速度信號(hào)中的誤差信號(hào)，并通過(guò)仿真和實(shí)驗(yàn)驗(yàn)證該方法的有效性。
關(guān)鍵詞：經(jīng)驗(yàn)?zāi)B(tài)分解；振動(dòng)測(cè)試；測(cè)量誤差；誤差分離
中圖分類(lèi)號(hào)：O241.1；TM930.115；TB53；O241.1 文獻(xiàn)標(biāo)志碼：A 文章編號(hào)：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
