Vibration and noise reduction effect of new type non-Newtonian fluid damper on drum washing machine

SONG Yuanjin1,2, ZHUANG Zhong2, CHENG Zhijun2, JIANG Weibin2, WANG Xianping2, FANG Qianfeng2

Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (15) : 311-322.

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (15) : 311-322.

Vibration and noise reduction effect of new type non-Newtonian fluid damper on drum washing machine

  • SONG Yuanjin1,2, ZHUANG Zhong2, CHENG Zhijun2, JIANG Weibin2, WANG Xianping2, FANG Qianfeng2
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Abstract

Typically used in drum washing machines, the friction damper has an insufficient damping effect at low load and high-frequency dewatering, which causes the washing machine shell to vibrate severely. In order to address this problem, a novel type of non-Newtonian fluid variable damping damper is proposed in this paper. Based on the non-Newtonian fluid shear thinning properties and the one-dimensional viscous flow equations in the damper holes, the vibration suppression effect and the physical mechanism of the washing machine during its operation were investigated. The non-Newtonian fluid has apparent shear thinning characteristics when compared to the conventional solid-state friction damper, which significantly reduces the output damping force of the non-Newtonian fluid variable-damping damper and fixes the drawback of the conventional damper that the apparent elastic coefficient rises at high frequencies. A systematic investigation of the vibration damping effect of dampers with various structural parameters on the low load eccentric operation of a washing machine shows that a smaller gap height is more advantageous for the dissipation of vibration energy and that appropriately increasing the viscosity of the non-Newtonian fluid or the number of piston heads can enhance the vibration suppression effect while also being beneficial for noise reduction. The results demonstrate that the variable damping damper can produce a good vibration damping effect for the entire washing process of the washing machine, especially for the high-frequency drying process, and the acceleration attenuation ratio can reach up to 83.49%, the energy attenuation is up to 98.44%, and the noise reduction is up to 10.38dB. This can be achieved through reasonable damping structure design and non-Newtonian fluid proportioning.

Key words

vibration damping / non-Newtonian fluid / variable damping / noise reduction

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SONG Yuanjin1,2, ZHUANG Zhong2, CHENG Zhijun2, JIANG Weibin2, WANG Xianping2, FANG Qianfeng2. Vibration and noise reduction effect of new type non-Newtonian fluid damper on drum washing machine[J]. Journal of Vibration and Shock, 2024, 43(15): 311-322

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