Modal Analysis Of Vibration Of Rolling Washing Machine

The vibration and noise for rolling washing machine are important factors to influence the working performances. The vibration of the washing machine could not only result in strong noise, but also influence the working life of mechanic and electric parts. Due to the structure properties, such as various parts in the washing machine and the cloth imbalance occurred in the running process at random, the vibration is inevitable in the working process of the washing machine. The vibration of the washing machine belongs to a complex nonlinear vibration because of the elastic pensile structure with the complicated connection. Therefore it is necessary to explore an effective method to analyze and control the vibration of rolling washing machine in view of the optimum design.This paper investigates the modal analysis and dynamic response on the super capacity rolling washing machine of Little Swan through the finite element method. The related information such as natural frequency and vibration mode of the model can be obtained by the modal analysis. The curve between the vibration value and time on any spot of the model can be obtained by the dynamic response. The model is justified in comparison with the modal experiment, and shows the vibration characteristics of the washing machine. The vibration can be forecast, and the design can be optimized for the washing machine structure by the model. Some works have been done in this paper.1. The finite element ANSYS software is applied to the modal analysis according to the actual vibration circumstances. The vibration law of the washing machine trunk is systematically investigated. The modal is calculated by Lanczos method using finite element software. The natural frequency and vibration mode of the washing machine trunk can be obtained. The natural frequency range is determined for the actual structure system. It provides the basis for the study of structure optimization and dynamic response of the washing machine. The research results show that the vibration modes mainly display the second bending mode along Y direction, the second bending mode along Z direction, and the second bending mode along the cater corner direction of the side board correspond to the different modal mode.2. The dynamic response at any point at certain instance can be obtained through transient dynamic analysis using the finite element model. The curve vs time at the measuring point can be obtained by transient dynamic response analysis, and the response peak value can be obtained. The vibration circumstances can be forecast. The transient dynamic analysis of the washing machine trunk is obtained under different revolution 750, 800, 900, 1000r/min. The research results show that the vibration value becomes larger at center point of the side board under the revolution 750 and 1000 r/min, the vibration value becomes larger at corner point of the side board under the revolution 800 r/min, and the washing machine display good stable characteristics under the revolution 900 r/min. The research work presents an effective way for the structure design and improvement of the washing machine.3. The research work presents the structure design and improvement of the washing machine in view of reducing the vibration. The modal analysis technology is applied to analyze the vibration before and after the structure improvement of the washing machine trunk using finite element software. The different natural frequency and vibration mode at certain frequency range can be forecast by the modal analysis. The research work provides a base for the appropriate design of the washing machine trunk through the dynamic characteristics evaluation before and after the structure improvement. The research results show that the washing machine after the structure improvement have good dynamic performances with the vibration value obviously reducing. The vibration parameters meet the design demand.4. The vibration of the washing machine is measured by the modal test method. The calculated modal parameters using the finite element method is compared to the experimental values. The research results show the modal analysis is close to measuring results. The research work provides an effective method to analyze the vibration of rolling washing machine. It is suitable for structure optimum design to reduce the vibration of rolling washing machine.