Investigation of the dynamic characteristics of a dual rotor system and its start-up simulation based on finite element method
Zhong-xiu Fei, Shui-guang Tong, Chao Wei
Institute of Chemical Machinery Engineering, Zhejiang University, Hangzhou 310027, China; Mechanical Design Institute, Zhejiang University, Hangzhou 310027, China; Institute of Thermal Engineering and Power Systems, Zhejiang University, Hangzhou 310027, China
Abstract Recently, the finite element method (FEM) has been commonly applied in the engineering analysis of rotor dynamics. Gyroscopic moments, rotary inertia, transverse shear deformation and gravity can be included in computational models of rotor-bearing systems. In this paper, a finite element model and its solution method are presented for the calculation of the dynamics of dual rotor systems. A typical structure with two rotor shafts is discussed and the procedure for obtaining the coupling motion equations of the subsystems is illustrated. A computer program is developed to solve critical speeds and to simulate the transient motion. The influence of gyroscopic moments on co-rotation and counter-rotation is analyzed, and the effect of the speed ratio on critical speed is studied. The dynamic characteristics under different conditions of increasing speed during start-up are demonstrated by comparison with transient nodal displacements. The presented model provides a complete foundation for further investigation of the dynamics of dual rotor systems.
Zhong-xiu Fei, Shui-guang Tong, Chao Wei. Investigation of the dynamic characteristics of a dual rotor system and its start-up simulation based on finite element method. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2013, 14(4): 268-280.
