Dissertation > Industrial Technology > General industrial technology > Acoustic engineering > Vibration, noise and its control > Vibration and noise control and its use

Study on the Noise Control of Rolling Washing Machine

Author XuChao
Tutor ZuoYanYan
School Jiangsu University
Course Environmental Engineering
Keywords rolling washing machine vibration and noise modal analysis finite element method (FEM) harmonic response analysis aerodynamic noise
Type Master's thesis
Year 2007
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As a source of pollution, noise has attracted people much more attention when people were more and more care of environment protection. Most people’s requirement for washing machine is not only washing clothes, but also hope that they can work with little noise and vibration. The noise and vibration of some rolling washing machine is severe, so we make some measurement and analysis to decrease the noise and vibration on it.At first, according to the national standards of GB/T4288-2003《household electric washing machines》, noise and vibration of the automatic rolling washing machine were tested, its sound power level was measured when the washing machine was working on dehydrating, its noise and vibration spectra were obtained, and its main sources of noise and vibration were identified. In addition, According to the test standards of GB/T10069《The testing method and limit value of rolling electrical motor》, the noise of the electrical motor, which is used in the rolling washing machine, was measured also. The main factors that affected the noise of the electrical motor were analyzed. Based on the works above, some advices were presented in order to decrease its noise.In order to obtain the intrinsic characteristic of the rolling washing machine cabinet, an experimental modal analysis on the rolling washing machine cabinet was performed. Then the modal parameters were identified. At the same time, a finite element model of the cabinet was established by finite element analysis software ANSYS to analyze the modal calculation. The results from test and calculation are in good agreement each other, which indicate that the finite element model established is correct.Based on the modal analysis results above, some simulating improvements on the cabinet were conducted. The vibration response analysis was performed by establishing finite element model, increasing its rigidity was proved an effective measurement for decreasing the cabinet vibration. At last, a simulating analysis of aerodynamic noise around the string and the end cover of the electrical motor were conducted by the computational fluid dynamics software FLUENT. Based on the computational results above, some suggestions were expounded to diminish the aerodynamic noise.

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