具有局部非线性刚度的复杂转子系统动力学模型及振动特性分析
发布时间：2018-07-23 13:05
【摘要】：为了更加精确地预测航空发动机高速柔性转子系统振动响应,为整机振动抑制提供技术支撑,以实际航空发动机转子系统为对象,对其主体结构特征及其连接结构所引起的弯曲刚度非线性特征进行了论述,在此之上建立了其动力学模型。针对这种具有局部非线性刚度的复杂转子系统动力学模型,结合FFT和Broyden迭代方法发展了一种数值谐波平衡法,通过频域方程中的自由度缩减,降低了方程规模,大幅度提高了求解效率。将该方法应用于试验转子的动力特性求解,结果表明:本文方法相比经典数值积分方法可以节省10倍以上时间。采用此方法对涡扇发动机低压转子系统在局部非线性刚度下的动力响应规律进行了分析,论证了论文方法的工程适用性。
[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.
【作者单位】： 北京航空航天大学能源与动力工程学院;先进航空发动机协同创新中心;
【分类号】：V231.96
，
本文编号：2139500
[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.
【作者单位】： 北京航空航天大学能源与动力工程学院;先进航空发动机协同创新中心;
【分类号】：V231.96
，
本文编号：2139500
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