Research On Gearbox Vibration And Noise Control Method Based On Local Feature Optimization

Due to the advantage of high transmission efficient, strong load capacity, precise transmission ratio, operation reliability as well as compact structure, gearbox transmission system has become one of the most widely used transmission systems. However, since the vibration and noise characteristics of the gearbox system have great impact on the working performance of the whole mechanical system, great vibration will accelerate the failure of as well as shorten the service life of the machine and may even cause great economic loss and personnel injuries, the research on the control of the vibration and noise of the gearbox transmission system has significantly important value to improve the working performance of the gear transmission system.The vibration and noise characteristics of the gearbox are directly related to the source of the noise, the radiation area of the gearbox as well as the transmission path. During the structural design,There may be local modes that can not Meet the requirements and there is not a method that can quickly suppress the local mode and without affecting the whole structure mode, in order to solve this problem, based on the researches on the vibration source, the radiation areas as well as the transmission path, a gearbox structure optimization method based on the modal characteristic is proposed in this paper and the local structures of the gear and the gearbox are optimized. The vibration and noise characteristics of the gearbox before and after optimize are also compared in this paper to validate the effectiveness of the method as well as the analysis on the influence of the damping placed on the transmission path or the radiation area on the gear radiation noise. This paper is organized as follows:â‘ Great vibration and radiation noise may occur when the modal frequency of the gearbox is close to the excitation frequency. So, in order to solve this problem, a gearbox structure optimization method based on the modal characteristic is formulated in this paper, the FEA method is adopted to obtain the modal frequencies and vibration modes of the gearbox and the modal experiment is conducted to validate the correctness of the calculation method; local structures of the gearbox is optimized based on the local structure optimize method and the pre and after analysis result verified the effectiveness of the optimize method based on the modal characteristics;â‘¡Gear transmission dynamic model is established to obtain the inner dynamic excitation of the gearbox; gearbox transient calculation model is built to obtain the pre and after dynamic response characteristics of the gearbox; the result indicates that the after optimize gearbox can effectively restrain the vibration level of the gearbox and furthermore validate the effectiveness of the optimize method;â‘¢Gearbox acoustic calculation model is established based on the transient calculation results and the radiation noise characteristics of the gearbox pre and after optimize is achieved; the results indicates that the after optimize gearbox can effectively restrain the radiation noise level of the gearbox and validate the effectiveness of the optimize method based on the modal characteristics on the control of the gearbox noise;â‘£Gearbox transient calculation model with isolation and damping material is established to obtain the dynamic vibration characteristic of the gearbox pre and after optimize; gearbox acoustic calculation model is established based on the dynamic response results and the radiation noise of the gearboxes with isolation material as well as damping material are obtained separately.