Dynamic Characteristic Analysis And Parameter Optimization Of Drum Washing Machine

Washing machine is indispensable for life,and the drum washing machine because of its more advanced functional experience and more in line with the requirements of clothing delivery,the washing machine market proportion has been rising,but the vibration and noise generated in the process of its operation will greatly reduce the product performance and user experience.Aiming at the vibration and noise reduction of a kind of automatic drum washing machine,this paper studies the influence of system parameters on the dynamic performance of the whole machine under the condition of high speed dewatering through dynamic theoretical modeling and virtual prototype simulation calculation,and reduces the vibration amplitude by optimizing the parameters,which is the basis for the design of product upgrading and reconstruction.Firstly,according to the structural characteristics and working principle of the drum washing machine,the dynamic model of the three-degree-of-freedom suspension system of the drum washing machine is given.The maximum amplitude of the centroid displacement along the X-axis and z-axis is 5.3 mm and 3.0 mm respectively by using the mathematical software MATLAB.Moreover,the stiffness coefficient has a great influence on the center of displacement amplitude of the system.The maximum displacement amplitude is directly proportional to the eccentric mass of clothing.Moreover,when the displacement amplitude is 1.5-2.0 kg,the Z-direction displacement amplitude increases sharply and is larger than the X-direction displacement amplitude.Secondly,the finite element software ANSYS was used for the modal calculation and analysis of the drum washing machine(box body and external drum).The first natural frequency of the box body was 21.4 Hz,lower than the dehydration working frequency of the drum washing machine(23.3 Hz).Structural resonance phenomenon was easy to occur during the dehydration acceleration.The first natural frequency of the external drum has reached 50.637 Hz,which will not produce resonance phenomenon when it is larger than the working frequency of the washing machine.By comparing the results of test mode and calculation mode,the relative error of each natural frequency is maintained within 4.7%,which verifies the accuracy of the finite element model.Again,the platen washing machine was established based on kinematic software ADAMS/View the virtual prototype model of rigid body,and to establish a flexible body and the external file to get the coupled model,the simulation analysis of the prototype model dehydration conditions movement characteristics,get along the X axis and Z axis of maximum displacement amplitude is 5.0 mm and 3.2 mm respectively,comparing the results of numerical analysis,get two integral calculation error is not more than 6%,a basic model.Finally,through the ADAMS/Insight module platen washing machine parametric model is established,the parameters of system parameter optimization,the sensitivity is larger final system center of mass root-mean-square amplitude was reduced by 30%,the biggest spring stiffness coefficient decreases 20%,eccentric mass decreases 12.5%,quality of upper and lower weight increased by 2.5%and 5%respectively,the optimized system center of mass along the X axis maximum amplitude decrease 30%,maximum amplitude along the Z axis displacement was reduced by 25%.In the design of the upgrading and reconstruction of the drum washing machine under the condition of dehydration,it should be noted that the stiffness coefficient of hanging spring should not be too large,and the larger the weight and eccentric mass of the system,the greater the vibration of the system under the condition of dehydration,so the balance of the system and eccentric mass should be reduced as far as possible.