含轴承间隙的转子非对称支承等效力学特性模拟分析方法

轴承间隙与支承非对称广泛存在于旋转机械系统中，是转子振动跳跃、偏移、反进动等复杂振动特性产生的主要影响因素。工程中对两者耦合影响下的复杂振动机理阐释不清，相关的等效力学模拟方法也各有局限。为此提出一种含轴承间隙的非对称支承结构等效力学特性模拟分析方法。通过支承结构的周向分解，解决了现有等效力学模拟方法难以同时模拟轴承间隙与支承非对称的问题。通过对典型发动机转子系统的分析对所提方法有效性进行了验证。结果显示轴承间隙与支承非对称共存时，系统会同时表现频率分离，振动跳跃与偏移现象，并且轴承间隙与支承非对称的影响相互耦合。所提模拟方法为工程中此类复杂振动问题产生机理的深入分析奠定了基础。

Simulation Analysis Method for Equivalent Mechanical Characteristics of Rotor Asymmetric Supports with Bearing Clearance

The asymmetry of bearing clearance and bearing support exists widely in rotating systems. They are the main influence factors of complex vibration characteristics such as rotor vibration jumping, deviation and backward whirling. In engineering, the complex vibration under their coupling influence is not clear, and the relevant equivalent simulation methods are also imperfect. Therefore, a simulation method for equivalent mechanical properties of asymmetric support structures with bearing clearance is proposed. The problem of the existing method, which is difficult to simulate the asymmetry of bearing clearance and support simultaneously, is solved by the circumferential decomposition of the support structure. The effectiveness of the proposed method was verified by the analysis of a typical engine rotor system. The results showed that when the bearing clearance and the support coexist asymmetrically, frequency separation, vibration jumping and deviation appeared, and the influences of bearing clearance and the support were coupled to each other. The proposed simulation method lays a foundation for the in-depth analysis of the mechanism of such complex vibration problems in engineering.