Research On Analysis And Optimization Method Of Axial Nonlinear Characteristics Of Clutch Wave Plate

The driven disc assembly of automobile clutch is an important part of clutch,which has the function of smooth engagement and attenuation of torsional vibration.As an axial elastic part of clutch driven disc assembly,the wave plate plays a key role in the function of clutch.At present,the design of wave plate is mainly based on the reverse development method of repeatedly modifying parameters-tests,which leads to the long cycle and poor versatility of wave plate research and development.In this thesis,the axial non-linearity of wave plate is analyzed in detail,and the optimization method of this characteristic is studied.The main work of this thesis is as follows:1)The composition and structure of clutch,working principle and experiment verification method of wave plate are introduced.The effect of wave plate on clutch engagement and disengagement performance is analyzed through bench experiment,and the forward development process of wave plate is sorted out.2)Based on the variable width cantilever plate,the axial nonlinearity of the wave plate is analyzed theoretically,and the relationship between the axial load and the axial displacement of the wave plate is deduced.The finite element model of wave plate under axial compression is established by using the finite element method.The error sources of the deviation between the simulation and the measured results are analyzed,and the finite element model setting error and the geometric error of the object are corrected to refine the finite element model.The calculated curve is in good agreement with the experimental curve.3)Based on the refined finite element model,the sensitivity of structural parameters to evaluation index is analyzed by single factor test design and orthogonal test design.By synthesizing sensitivity ranking,the main structural parameters of the wave plate are identified as design variables for optimizing the axial non-linear characteristics of the wave plate.A simplified heat transfer model of wave plate-friction plate was established.The effects of temperature on the axial non-linearity of wave plate and the torque transfer characteristics of clutch were studied.4)The optimum design method of wave plate structure parameters is established.This method constructs an surrogate model which takes the main structural parameters of the wave plate as design variables and the chi-square distance between the design curve of axial force and displacement and the target curve as response.The accuracy of the predicted chi-square distance of the model is tested by several intermediate data points,and the relative error between the predicted chi-square distance and the calculated value of the finite element model is not more than 5%.Differential evolution algorithm is used to solve the surrogate model,and the optimal combination of the main structural parameters is obtained,which makes the chi-square distance order of magnitude only 10^-3 mm.The research in this thesis can provide an effective method for analyzing the axial non-linearity of wave plate and guiding the forward design of wave plate structure parameters.It is of great significance to improve the efficiency of wave plate development.