To control vibrations of the spin-drying process of a horizontal axis washing machine during the transient stage, a planner model is built for a horizontal axis washing machine with MR dampers; Numerical simulations considering an acceleration process following an exponential curve is considered, the relation between the maximum vibration amplitude and the time constant of the exponential curve is studied; The average value of the maximum vibration amplitude under several different rotation speeds is calculated, and variations of the average value along with the increase of the mass of the clothes and control current of the MR damper are analyzed, the result shows that the control current of the MR damper has little influence on the optimal time constant, and for clothes with mass between 1 to 9 kilograms, the time constant can be set at 0.7 to achieve a good comprehensive control result. Besides, a simple control strategy of the MR damper considering vibration suppression at the transient stage and vibration isolation at the steady stage is proposed, the short time frontier transform is employed for tracing the vibration frequency of tub, once the frequency grows bigger than a preset value, the control current of the MR turns from the maximum value to the minimum one for vibration isolation, at last, the control effect is proved by numerical simulations.
CHEN Haiwei ZHANG Qiuju.
Vibration Analysis and Control of the Spin-Drying Process of a Horizontal Axis Washing Machine during the Transient Stage [J]. Journal of Vibration and Shock, 2013, 32(15): 47-53
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