Structural Optimization And Simulation Analysis Of Diaphragm Spring Clutch

Clutch is a key component to ensure the smoothness of starting and shifting of various types of vehicles.Its main function is to realize the transmission of power and the real-time cutting off of automobiles.Due to its strong stability and simple structure,the diaphragm spring gradually replaces the traditional form of helical spring clutch and has been widely used in the automotive industry.Diaphragm spring is an important component of the clutch.The mechanical performance of the diaphragm spring has an important influence on the performance of the entire clutch.Therefore,the optimization design of diaphragm spring performance has gradually become a research hotspot in the automotive field.At present,although there has been no small progress in the field of multi-objective optimization research of diaphragm springs,the main research fields of domestic and foreign scholars are mainly focused on the single objective optimization of diaphragm springs.Because the optimal design of the diaphragm spring is a typical multi-objective optimization problem,different optimization objectives include different physical meanings.At the same time,the complexity and the mutual competition between them greatly increase the difficulty of obtaining the optimal design.In this dissertation,the double-objective optimization design of the diaphragm spring based on genetic algorithm and fmincon function is done.Based on this,the current objective function is obtained through the current combination.Finally,combined with optimized parameter modeling and finite element simulation analysis,the correctness of the optimized design was verified.(1)Combining with the structural characteristics of the clutch,a systematic analysis of the diaphragm springs for different working processes is carried out,including the theoretical analysis of the loading mode,deformation,and working position of the diaphragm spring,and the corresponding mathematical calculations to analyze the characteristic curves.The influence of the change of the main structural parameter on the characteristic curve was studied,and the mechanical model of the diaphragm spring was constructed.(2)Construct a mathematical model of diaphragm spring based on multi-objective optimization.Select the spring compression force with the smallest average value of the change within the wear limit range as the first optimization target;select the minimum value of the separation force acting on the release bearing device by the driver during the separation stroke as the second optimization target.The fmincon function and the genetic algorithm are used to solve the established mathematical model respectively to obtain two basic parameter values.Through the analysis and comparison,it is better to use a genetic algorithm to synthesize the optimization results.After analysis and optimization,it can be seen that the geometry of the diaphragm spring is reduced,and the value of the compression force after wear is slightly decreased.However,the characteristic curve is obviously better than the optimization before the optimization in the wear limit range,which indicates the stability of the compression force.Sex has been improved to some extent.(3)In this paper,modeling software is used to calculate the three-dimensional model of the diaphragm spring by calculating the optimized parameter values.And in the Workbench,the studied objects are simulated and analyzed.According to the simulation results,the root of the separation finger is the site where this study object is subjected to the greatest stress.When the stress exceeds the safety value,the fracture phenomenon occurs.The maximum yield strength of a diaphragm spring calculated and verified as a material of 60Si2 MnA high-grade steel is higher than the maximum stress,confirming the correctness of the optimized design parameters.(4)Using the frequency of the engine's rotation speed as a reference value,analyze and study the natural frequency values of the 1st to 12 th order diaphragm springs.The rigid modes are 1 to 6 steps,and the natural frequencies of 7 to 12 steps are all greater than the reference value to ensure that the diaphragm spring does not resonate with the engine and its matching with the engine work is verified.