分布式拉杆转子扭转振动系统动力学特性分析

为了更好的提高能源利用率,以新兴、高效的分布式拉杆转子系统为代表的燃气轮机与蒸汽轮机联合发电技术在电力部门得到快速发展.本文主要研究了分布式拉杆转子系统扭转振动的非线性动力学特性,通过等效简化等方法建立了分布式拉杆转子系统扭转振动方程.利用平均法获得动力学方程解析解和系统扭转振动幅频曲线,进一步研究了其周期解的稳定特性,并发现系统阻尼,立方刚度和外激频率等参数对其影响规律.本文的分析结果对燃气轮机转子系统动力学设计具有一定的指导意义.

Analysis of characteristics of the torsional vibration of the distributed rod fastening rotor system

In order to improve efficiency, the gas and steam turbine cycle technology, represented by newly distributed rod fastening rotor system, gets fast development in electrical production departments. In this paper, nonlinear characteristics of the distributed rod fastening system are studied by a novel torsional vibration model. By using equivalent and simplification method, torsional vibration model of the distributed rod fastening rotor system are established. Based on the average method, analytical solutions and the amplitude frequency curves of the dynamic system are obtained. Further, the stability of periodic solutions of the dynamic system is studied, and impacts of the external excitation, damping and cubic stiffness are investigated respectively. Analysis results of the dynamic system have a guiding significance to design.