A novel concept of components system stiffness and stiffness model application for VSV adjustment mechanism

Abstract

In actual engineering practice of the variable stator vane (VSV) adjustment mechanism, it has been found that the deformation beyond design conditions of the kinematic chain formed from the linkage ring to the blades influences the motion accuracy of the mechanism the most. In this paper, the static stiffness model of the components system, formed from the linkage ring to the blades, is developed and then a motion compensation method based on the stiffness model is proposed. The correctness of the stiffness model is verified by the FEA method. With the model, influence factors such as blade quantity on the stiffness are characterized. In order to investigate the engineering applicability of the stiffness model, the motion compensation model is applied to the dynamic analysis and contrasts with the experimental results of two test benches designed based on the real VSV mechanisms. As a result, the validity of the stiffness model and the value of the proposed method are both well affirmed.