New Contact Force Model and Experiment of Revolute Joints with Clearance in the Variable Stator Vane Mechanism

doi:10.3901/JME.2025.01.001

Abstract

Abstract: A new continuous contact force model considering conformal contact is proposed to address the issue of inaccurate calculation of dynamic contact force for revolute joints with small clearance in the variable stator vane (VSV) mechanism of aero engines. Firstly, the elastic contact force model is modified based on the improved Winkler contact theory. On this basis, a new continuous contact force model for small clearance revolute joints is proposed by incorporating the damping dissipation term from the Flores model, which has a wide range of applicability for the restitution coefficient. Then, the applicability of the proposed contact force model is analyzed under different contact lengths, restitution coefficients, clearance values and initial collision velocities, and compared with traditional contact force models such as L-N model. Finally, the proposed contact force model is applied to the dynamic calculation of the clearance revolute joint of the VSV mechanism. A VSV mechanism principle-level experimental platform is designed for experimental verification. The results indicate that the dynamic numerical calculation based on the new model can accurately reflect the contact characteristics of the clearance joint and the dynamic response of the mechanism, verifying the effectiveness of the proposed contact model.

Key words: revolute joints with clearance, conformal contact, contact force model, aero engines, VSV mechanism

CLC Number:

TH113

ZHANG Hongwei, LUO Zhong, XU Chunyang, CHANG Jing, YAO Sibo. New Contact Force Model and Experiment of Revolute Joints with Clearance in the Variable Stator Vane Mechanism[J]. Journal of Mechanical Engineering, 2025, 61(1): 1-12.

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