双转子结构广泛应用于现代航空发动机中。为了提高推重比,常将高压转子的后支点设计成轴间轴承(或称中介轴承)形式。常将转子设计成柔性转子,即在工作范围内,转子要越过一阶、二阶甚至三阶临界转速。这就使得发动机转子成为耦合很强的双转子系统,传统的单转子理论不能完全描述其振动特性。建立采用中介轴承的双转子模型,考虑支承刚度和阻尼的影响,运用解析方法分析双转子的振动特性,以揭示双转子的振动规律,解释实际运行中出现的现象。 Double rotor structure is widely used in modern aircraft engines. In order to improve the thrust-to-weight ratio, often the high-pressure rotor rear fulcrum designed as shaft bearing (or intermediate bearing) form. Often the rotor is designed as a flexible rotor, that is, in the working range, the rotor to go beyond the first, second and even third-order critical speed. This makes the engine rotor become a strongly coupled two-rotor system. The traditional single-rotor theory can not fully describe its vibration characteristics. The dual-rotor model with intermediate bearing is established. Considering the influence of supporting stiffness and damping, the analytical method is used to analyze the vibration characteristics of dual-rotor to reveal the vibration law of dual-rotor and explain the phenomena in actual operation.