【摘要】：為了更加精確地預(yù)測航空發(fā)動(dòng)機(jī)高速柔性轉(zhuǎn)子系統(tǒng)振動(dòng)響應(yīng),為整機(jī)振動(dòng)抑制提供技術(shù)支撐,以實(shí)際航空發(fā)動(dòng)機(jī)轉(zhuǎn)子系統(tǒng)為對象,對其主體結(jié)構(gòu)特征及其連接結(jié)構(gòu)所引起的彎曲剛度非線性特征進(jìn)行了論述,在此之上建立了其動(dòng)力學(xué)模型。針對這種具有局部非線性剛度的復(fù)雜轉(zhuǎn)子系統(tǒng)動(dòng)力學(xué)模型,結(jié)合FFT和Broyden迭代方法發(fā)展了一種數(shù)值諧波平衡法,通過頻域方程中的自由度縮減,降低了方程規(guī)模,大幅度提高了求解效率。將該方法應(yīng)用于試驗(yàn)轉(zhuǎn)子的動(dòng)力特性求解,結(jié)果表明:本文方法相比經(jīng)典數(shù)值積分方法可以節(jié)省10倍以上時(shí)間。采用此方法對渦扇發(fā)動(dòng)機(jī)低壓轉(zhuǎn)子系統(tǒng)在局部非線性剛度下的動(dòng)力響應(yīng)規(guī)律進(jìn)行了分析,論證了論文方法的工程適用性。
[Abstract]:In order to predict the vibration response of high-speed flexible aero-engine rotor system more accurately and provide technical support for the whole engine vibration suppression, the actual aero-engine rotor system is taken as the object. The characteristics of the main body structure and the nonlinear characteristics of the bending stiffness caused by the connection structure are discussed, and the dynamic model is established. Aiming at the dynamic model of a complex rotor system with local nonlinear stiffness, a numerical harmonic balance method is developed in combination with FFT and Broyden iterative methods. By reducing the degree of freedom in the frequency domain equation, the scale of the equation is reduced. The efficiency of solution is greatly improved. The method is applied to solve the dynamic characteristics of experimental rotor. The results show that the proposed method can save more than 10 times more time than the classical numerical integration method. This method is used to analyze the dynamic response of the low-pressure rotor system of turbofan engine under the local nonlinear stiffness, and the engineering applicability of the method is demonstrated.
【作者單位】： 北京航空航天大學(xué)能源與動(dòng)力工程學(xué)院;先進(jìn)航空發(fā)動(dòng)機(jī)協(xié)同創(chuàng)新中心;
【分類號】：V231.96
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本文編號：2139500