Research on parametric modelling method of aero-engine guide vane adjustment mechanism of variable geometry turbine reflecting dimensional uncertainty

Aiming at the problem of low control accuracy of aero-engine kinematics, the multidisciplinary coupled dynamics simulation method and reliability modelling method are studied. In this paper, based on the ADAMS software platform, the parametric modelling is proposed for aero-engine guide vane adjustment mechanism of variable geometry turbine, and the parametric model is simulated. The equation of motion for the mechanism is established based on MATLAB and is theoretically analyzed and verified. The result is consistent with the theoretical analysis result, which verifies the correctness of the mathematical model and the simulation model. The dimensional uncertainty caused by machining errors and the effect of component deformation caused by external loads on the vane motion accuracy are considered in this paper. Through the simulation analysis, the key factors affecting the vane motion accuracy can be identified, providing guidance for the establishment of the reliability model. Finally, the reliability of the vane rotation angle is calculated by Monte Carlo method. The method proposed in this paper can be used to improve the reliability design and optimize the structure of the guide vane adjustment mechanism of variable geometry turbine.