| Drum washing machine produces large vibration and noise during high-speed dehydration,which is a difficult problem restricting its development.The drum washing machine on the market mainly uses traditional shock absorbers,which have simple structure,non-adjustable damping,and cannot achieve the best shock absorption effect.In order to solve this problem,a high-efficiency shock absorber needs to be designed,which can adjust the damping and adapt to different working conditions.This paper aims to design a semi-active variable damping shock absorber,using magnetorheological elastomer as the core material,design a reasonable mechanical structure according to the space and shock absorption requirements of the drum washing machine,and analyze its dynamic performance to verify its shock absorption effect.The main contents of this paper are as follows:(1)According to the structural characteristics and working principle of the drum washing machine,analyze the influence of eccentric mass on the vibration of the drum washing machine,and through the analysis of the working principle of the traditional damper,combined with the shear mode of magnetorheological elastomer,determine the size parameters of the involved materials,and design the structure of the damper.(2)The magnetic circuit of MRE damper is analyzed and calculated by using magnetic circuit Ohm’s law,and ANSYS Maxwell software is used to verify the accuracy and rationality of the magnetic circuit.The dynamic simulation model of the designed damper structure is built by using Simulink to test the dynamic performance and determine the damping effect.(3)Taking energy as the starting point to describe the motion of the suspension system in space position,establishing a six-degree-of-freedom mathematical model of drum washing machine by using Lagrange equation,and performing numerical simulation on the mathematical model based on Runge-Kutta algorithm,obtaining the dynamic response of suspension system under various working conditions,and verifying the accuracy of this dynamic model.(4)Taking drum washing machine mother as reference,using CREO to draw each part of drum washing machine,and assembling and simplifying it,importing three-dimensional model into ADAMS,establishing virtual prototype of drum washing machine,setting relevant parameters,simulating and analyzing its dynamic characteristics under dehydration condition.Start simulation under different conditions,verify feasibility of damper design scheme based on magnetorheological elastomer according to results.(5)Aiming at complex system of drum washing machine,a test measurement platform is built.Three-axis acceleration sensor is used to detect dynamic characteristics during dehydration.Contrast experiment method is used to test traditional damper and MRE damper respectively.Through contrast analysis of experimental results,feasibility of theoretical model is verified,and actual damping effect of drum washing machine after using MRE damper is obtained. |
