INFLUENCE OF CENTRIFUGAL STIFFENING ON A ROTOR SYSTEM WITH A FLEXIBLE DIAPHRAGM COUPLING
In this paper, an investigation to estimate the influence of rotational speed on the flexible coupling rotor using a time invariant model has been carried out. A rigid hollow shaft with a flexible diaphragm coupling as a rotor system is studied for its dynamic behavior by deriving a finite element rotor model. To estimate stiffness parameters of flexible coupling to include in the finite element model, a solid modeling of the coupling has been generated and a quasi-static analysis has been carried out at different speeds using ABAQUS software. The estimated stiffness in all six degrees of freedom has been lumped as a stiffness matrix for the coupling in the time invariant rotor model. Eigen analysis performed on the discretized flexible coupling rotor model clearly indicates that the bending critical speeds of the model vary depending on angular velocity due to centrifugal stiffening and gyroscopic couple. For speeds up to 20,000 rpm, the increase in the first critical of the flexible rotor is 15％. Critical speed obtained is verified with simplified analytical calculation. Also a limited experiment has been done to validate the stiffness value input in the FEM model.
fezible coupling rotor centrifugal stiffening
S.Ganesan C.Padmanabhan
Machine Design Section, Department of Mechanical Engineering, Indian Institute of Technology, Madras, Chennai, India
国际会议
The Fifth International Conference on VETOMAC-V(第五届振动工程及机械技术国际会议)
武汉
英文
69-75
2009-08-27（万方平台首次上网日期，不代表论文的发表时间）