(中南工業(yè)大學(xué)機(jī)電工程學(xué)院， 長(zhǎng)沙 410083)
摘 要: 對(duì)轉(zhuǎn)子系統(tǒng)振動(dòng)的線性化建模與分析，在非線性因素較為突出時(shí)，不僅導(dǎo)致定量上的誤差；更重要的是，將忽略真實(shí)轉(zhuǎn)子系統(tǒng)豐富的非線性振動(dòng)現(xiàn)象，這對(duì)于機(jī)械故障分析與診斷是非常不利的。針對(duì)上述情況，提出了一種轉(zhuǎn)子系統(tǒng)非線性振動(dòng)的辨識(shí)建模方法，該方法僅需利用不平衡激勵(lì)的周期位移響應(yīng)，無(wú)需人工激振，數(shù)學(xué)處理、編程較為簡(jiǎn)單，便于實(shí)施。實(shí)驗(yàn)結(jié)果表明，該辨識(shí)建模方法是行之有效的。
關(guān)鍵字: 轉(zhuǎn)子 系統(tǒng)辨識(shí) 機(jī)械故障診斷 非線性振動(dòng)
（College of Mechanical and Electrical Engineering,Central South University of Technology, Changsha 410083）
Abstract:Linear mathematical models for vibrations of rotor systems may lead to not only quantitative errors but also the neglect of rich nonlinear dynamic behaviour of real rotor systems, which is unfavourable to mechanical fault analysis and diagnosis when the nonlinearities of the systems to be investigated exist evidently．A new technique for identifying and modeling rotor systems has been presented in this paper. It uses only displacement data of steady-state periodic responses imbalance-excited, and does not require any specially designed excitation. Moreover, mathematical operations and programming for it are relatively simple. The present technique is proved to be effective through mathematically modeling a real rotor.
Key words: rotor system identification mechanical fault diagnosis nonlinear vibration
