燃气轮机拉杆转子动力学建模及临界转速计算

重型燃气轮机通常采用拉杆转子结构，此类转子-支撑系统的临界转速的分析计算与整体结构转子不同.以Riccati传递矩阵法为框架，对某燃气轮机中心拉杆转子结构进行分析并离散，考虑轴承支撑以及端面齿啮合对转子动力学特性的影响，建立转子 支撑系统的动力学计算模型.利用该模型对临界转速以及相应的振型进行计算，并通过与试验台实测结果的对比，验证了计算模型和方法的正确性，该方法可应用于类似结构转子动力学特性的分析研究.

Dynamic Modeling and Critical Speed Calculation of Gas Turbine Rod Fastening Rotor

Rod fastening rotor is usually used in heavy duty gas turbine rotor-support system, of which critical speed calculation differs from that of the integral rotor. In the framework of Riccati transfer matrix method, discretization of central tie-rod fastening rotor structure with detailed analysis was conducted. Taking into account the impacts which are brought by bearing support and meshing face tooth on dynamic characteristics of rotor system, a computation model of rotor-support system was further established. In this way, critical speeds and the corresponding modes were obtained.The calculated result shows a good agreement with the test measurement result, which implies that the method is accurate and computation model is reliable. This approach can also be applied to analyze dynamic characteristics of rotors with homogenous structure.