| As an important part of the vehicle suspension system,the damping characteristics of the shock absorber have a great relationship with the vehicle's handling stability and ride comfort.In order to match the driving feeling orientation of the vehicle,the damping characteristics of the shock absorber need to be repeatedly designed and adjusted.In the traditional development process of shock absorbers,many times of design and adjustment are needed.This method has a long development cycle,low efficiency and high cost,and the failure of shock absorbers often occurs due to design reasons.therefore,computer simulation technology has become an important means to improve the development level of shock absorber.In this paper,the computer-aided method of shock absorber design and development is studied,and the dynamic process of internal flow field of shock absorber is analyzed.Based on the vibration damper of A55 project,the main work of this paper is as follows:Firstly,based on the principle of elasticity,The calculation model of valve plate deformation is established,and the working process of the shock absorber is analyzed.The movement stroke of the shock absorber is divided into recovery stroke,compression stroke and working conditions before and after opening the valve.The physical parameter mathematical model of the shock absorber is established by combining the calculation model of valve plate deformation and the principle of hydrodynamics,and programmed by MATLAB The speed characteristic curve and the indicated power curve of the shock absorber are obtained;Secondly,according to the solid parameters,the solid and fluid three-dimensional models of the shock absorber are established respectively,and the fluid solid coupling simulation analysis is carried out by using ANSYS CFX software.According to the characteristics of oil flow in recovery stroke and compression stroke,the simulation analysis is carried out respectively.Under the condition of inlet velocity load,the oil pressure field,velocity field and the deformation and stress of the valve plate of the shock absorber are calculated and analyzed by using the sliding grid technique.According to the simulation results,the speed characteristic curve and the indicator curve of the damper are drawn;Thirdly,according to the shock absorber test standard QC/T545,perform a bench test on a certain type of shock absorber.Through the bench test,the speed characteristic curve and indicator power curve of the shock absorber at different test speeds were obtained as the verification standard for the calculation results of the computer simulation method,and the bench test results are compared with the simulation results to verify the analysis model.Finally,the method of shock absorber design and performance analysis is applied in an example.The structural parameters of the valve system are designed and verified by taking the damping characteristics of the shock absorber of a certain vehicle type as the design target to match the performance of the vehicle.Through the above research,the key problems in the damper simulation,such as the calculation of valve deformation and deflection,the application of FSC sliding grid technology,and the description of damper stroke parameters,are solved.The FSC simulation and mathematical model simulation methods of the damper are explored,and the calculation results are consistent with the bench test results,which meet the actual engineering requirements.According to the characteristics of the two simulation methods,a set of effective calculation and design analysis method of shock absorber is formed.By using this method,the design period of shock absorber can be effectively shortened,and the failure forms such as abnormal closure noise and valve disc fracture can be avoided as far as possible in the design stage,so as to reduce the workload and design cost. |
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