本文選題：多輪盤轉(zhuǎn)子系統(tǒng)　切入點(diǎn)：扭矩激勵(lì)　出處：《太原理工大學(xué)》2013年博士論文

【摘要】：多輪盤轉(zhuǎn)子系統(tǒng)的結(jié)構(gòu)比較復(fù)雜,在運(yùn)行過(guò)程中,可能由于外加扭矩激勵(lì)、初始軸彎曲等因素的影響,導(dǎo)致整個(gè)轉(zhuǎn)子系統(tǒng)出現(xiàn)故障。目前,多位學(xué)者已開展了相關(guān)研究。然而,這些研究還有待深入。本文在此基礎(chǔ)上,做了以下幾方面的研究： (1)在傳統(tǒng)扭矩激勵(lì)表達(dá)式的基礎(chǔ)上,對(duì)其進(jìn)行了改進(jìn)。分別對(duì)扭矩激勵(lì)表達(dá)式改進(jìn)前后仿真和試驗(yàn)結(jié)果進(jìn)行了對(duì)比分析,結(jié)果表明：改進(jìn)后扭矩激勵(lì)表達(dá)式能更準(zhǔn)確的反應(yīng)實(shí)際轉(zhuǎn)子系統(tǒng)扭矩激勵(lì)的加載。 (2)在改進(jìn)扭矩激勵(lì)表達(dá)的基礎(chǔ)上,考慮了非線性油膜力和彈性支承對(duì)多跨多輪盤轉(zhuǎn)子系統(tǒng)的影響,建立了基于扭矩激勵(lì)的多跨多輪盤轉(zhuǎn)子系統(tǒng)模型及動(dòng)力學(xué)方程,通過(guò)仿真和試驗(yàn)的方法分別研究了不同性質(zhì)(線性、暫態(tài))扭矩激勵(lì)對(duì)多跨多輪盤轉(zhuǎn)子系統(tǒng)各跨轉(zhuǎn)子彎振的影響。結(jié)果表明：在不同性質(zhì)扭矩激勵(lì)(線性、暫態(tài))的作用下,多跨多輪盤轉(zhuǎn)子系統(tǒng)各跨轉(zhuǎn)子振動(dòng)幅值均未出現(xiàn)變化,而振動(dòng)平衡位置出現(xiàn)向下偏移現(xiàn)象,并且各跨轉(zhuǎn)子X向偏移量要明顯小于Y向。 (3)在改進(jìn)扭矩激勵(lì)表達(dá)的基礎(chǔ)上,考慮了彈性聯(lián)軸器對(duì)多跨多輪盤轉(zhuǎn)子系統(tǒng)的影響,建立了多跨多輪盤轉(zhuǎn)子系統(tǒng)扭矩激勵(lì)傳遞模型,推導(dǎo)了軸承負(fù)荷對(duì)扭矩激勵(lì)的敏感度矩陣。通過(guò)仿真和試驗(yàn)的方法分別研究了多跨多輪盤轉(zhuǎn)子系統(tǒng)不同性質(zhì)(線性、暫態(tài))扭矩激勵(lì)的傳遞特性。結(jié)果表明：多跨多輪盤轉(zhuǎn)子系統(tǒng)不同性質(zhì)(線性、暫態(tài))扭矩激勵(lì)在X向和Y向的傳遞特性均不同,在同一扭矩激勵(lì)作用下,多輪盤轉(zhuǎn)子系統(tǒng)各支承X向和Y向軸承負(fù)荷對(duì)扭矩激勵(lì)的敏感性響應(yīng)不同。 (4)考慮了初始軸彎曲故障對(duì)多輪盤轉(zhuǎn)子系統(tǒng)的影響,建立了具有初始軸彎曲的多輪盤轉(zhuǎn)子系統(tǒng)模型及動(dòng)力學(xué)方程,仿真分析了初始彎曲量、偏心距及阻尼比對(duì)多輪盤轉(zhuǎn)子系統(tǒng)彎振的影響。通過(guò)小波和非線性流行方法實(shí)現(xiàn)了初始軸彎曲故障試驗(yàn)信號(hào)的特征提取及信號(hào)辨識(shí)。將仿真分析結(jié)果與提取的初始軸彎曲故障信號(hào)進(jìn)行對(duì)比分析,并提出了具有初始軸彎曲的轉(zhuǎn)子系統(tǒng)試驗(yàn)修正方程。 (5)在小波降噪和數(shù)學(xué)形態(tài)學(xué)降噪的基礎(chǔ)上,提出了小波形態(tài)濾波法。分別采用形態(tài)學(xué)降噪和小波形態(tài)濾波法對(duì)仿真信號(hào)和軸承負(fù)荷試驗(yàn)信號(hào)進(jìn)行了降噪處理,降噪結(jié)果很好地驗(yàn)證了小波形態(tài)濾波法對(duì)軸承負(fù)荷信號(hào)降噪的有效性。 通過(guò)本文的研究,可以更為清晰地明白扭矩激勵(lì)對(duì)多跨多輪盤轉(zhuǎn)子系統(tǒng)的影響,更為清楚地認(rèn)識(shí)到扭矩激勵(lì)傳遞、初始軸彎曲故障信號(hào)以及軸承負(fù)荷信號(hào)的特點(diǎn),為抑制扭矩激勵(lì)干擾、轉(zhuǎn)子系統(tǒng)典型故障診斷、提高轉(zhuǎn)子系統(tǒng)試驗(yàn)信號(hào)采集效率奠定了堅(jiān)實(shí)的基礎(chǔ)。
[Abstract]:The structure of multi-disk rotor system is complex. During operation, the whole rotor system may fail due to external torque excitation, initial shaft bending and other factors. At present, many scholars have carried out related research. On the basis of this, this paper has done the following research:. 1) on the basis of the traditional expression of torque excitation, the simulation and test results before and after the improvement of the expression of torque excitation are compared and analyzed. The results show that the improved expression of torque excitation can more accurately reflect the loading of actual rotor system torque excitation. On the basis of improving the expression of torque excitation, the influence of nonlinear oil film force and elastic support on multi-span and multi-disc rotor system is considered, and the model and dynamic equation of multi-span multi-disc rotor system based on torque excitation are established. The effects of different characteristics (linear, transient) torque excitation on the bending vibration of multi-span multi-disk rotor system are studied by simulation and experimental methods. The results show that under different characteristics of torque excitation (linear, transient), The vibration amplitude of each span rotor of multi-span and multi-disk rotor system has not changed, but the vibration balance position has the phenomenon of downward migration, and the X direction deviation of each span rotor is obviously smaller than that of Y direction. On the basis of improving the expression of torque excitation, the effect of elastic coupling on multi-span and multi-disk rotor system is considered, and the torque excitation transfer model of multi-span multi-disc rotor system is established. The sensitivity matrix of bearing load to torque excitation is derived. The different properties of multi-span multi-disk rotor system are studied by simulation and experiment. The results show that different properties (linear and transient) of multi-span multi-disk rotor system are different in X direction and Y direction. The sensitivity of bearing load to torque excitation is different in multi-wheel rotor system. Considering the effect of the initial shaft bending fault on the multi-disk rotor system, the model and dynamic equation of the multi-disk rotor system with initial shaft bending are established, and the initial bending amount is simulated and analyzed. The influence of eccentricity and damping ratio on bending vibration of multi-wheel rotor system is studied. The characteristic extraction and signal identification of the initial shaft bending fault test signal are realized by wavelet and nonlinear popular method. The bending fault signals of the initial axis are compared and analyzed. The experimental correction equation of rotor system with initial shaft bending is proposed. 5) on the basis of wavelet denoising and mathematical morphological de-noising, the wavelet morphological filtering method is proposed. The simulation signal and bearing load test signal are de-noised by morphological de-noising method and wavelet morphological filtering method, respectively. The denoising results show that the wavelet morphological filtering method is effective for bearing load signal de-noising. Through the research in this paper, the influence of torque excitation on multi-span and multi-disc rotor system can be clearly understood, and the characteristics of torque excitation transmission, initial shaft bending fault signal and bearing load signal can be more clearly realized. It lays a solid foundation for suppressing the disturbance of torque excitation, diagnosing typical faults of rotor system and improving the efficiency of signal collection in rotor system test.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2013
【分類號(hào)】：TH113;TH165.3

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