| The subject of this paper is from the project"The study of key common technologies of design and detection for gears"(No.2006BAF01B01-03) in the National Science & Technology Pillar Program during the Eleventh Five-year Plan Period of China and the project"The analysis software of vibration and noise for gearbox", commissioned by the 703 Institute of China Shipbuilding Industry Corporation.It is all known that noise produced by structure vibration is the main origin of gearbox noises. Studying the characteristics of the dynamic response and sound radiation during design stage of gear system, formulating rational noise reduction method have become an important task of gear system design. In this respect, it has important theoretical significance and engineering values to do numerical simulation and experimental research on vibration and noise of gear system with the method of FEM and BEM. The main researches are as follows:①Composition of the internal dynamic excitation of gear system. The varying stiffness excitations, shock excitations of tooth mesh and transmission errors are calculated by using the self-developed software. Then considering the contact ratio of gear pair, the composition method of the internal dynamic excitation of gear system is studied.②Analysis of the dynamic response and forecast of vibration severity and structural-borne noise of gear system. Establish the gear-shaft-bearing-housing coupled finite element model, analyze the natural frequency and dynamic response under internal dynamic excitation, and forecast the vibration severity and structural-borne noise of the gear system.③Analysis of shock resistance properties on gear system. Establish the shock dynamic finite element model to analyze the shock resistance properties of gear system under the external shock spectrum and the internal dynamic excitation.④Air-borne noise forecast for gear system. Establish acoustics simulation model of housing and transform the surface vibration response on the outside nodes of housing from time domain to frequency domain. Taking the response to acoustics simulation model as boundary conditions, the acoustic parameters and the air-borne noise of gear system can be calculated by using BEM.⑤Software development for vibration and noise analysis of gear system. Develop a three-dimensional auto-modeling program and three-dimensional contact finite element analysis program which can be used to analyze the varying stiffness of gear mesh; develop a three-dimensional shock/dynamic contact analysis program to calculate the shock excitations of gears; and develop the composition program of internal dynamic excitations.Then, the secondary development of vibration and noise of gear system based on ANSYS is carried out.⑥Experimental study on vibration and noise of gear system. Through the experimental modal analysis of gear system, and the test of vibration response and air pressure, the natural frequencies, vibration severity, structural-borne noise and air-borne noise are obtained. Then compare them with the numerical results gotten before. The two results show good agreement.
|
PDF Full Text Request