Analysis Of Nonlinear Vibration Of The Low Noise Vibratory Digging System With Multiple Movement Pair Clearances

As we known, super low noise breaking technology has special engineering background and prospects. In this dissertation, we elaborate the uncertainty and problems in the research process, especially when clearance exist in the system, a series of problems such as vibration, noise and wear will come. As a result, we focus on the solution to these problems in this paper.At first, we simplify the work part of the super low noise vibratory digging system, analyze the kinetics and dynamics properties of the work part, then establish the vibration equations of the overall system. The detailed researches of the thesis are as follows:1. Planar motion analysis and dynamic analysis of each part of the ideal system which doesn't have clearance are conducted, then the displacement, angular velocity and angular acceleration of each part are calculated. D'Alembert principle is applied to list the kinetics equations of each part, they compose an equation set. At last the stress and torque are obtained by complete pivot Gaussian elimination. All these works present initial data and comparisons for subsequent model analysis with clearance.2. There are inevitable mechanism with clearances at turning pairs, theirs existence has certain effects on the working parts of the system. So we study the Nonlinear dynamics properties of the system with single clearance and multiple clearances respectively.3. We focus on the whole system and study the nonlinear vibration phenomenon by the numerical analysis method. Nonlinear vibration equations of systems of single clearance and multiple clearances are calculated respectively, displacement and angular curves as well as amplitude-versus-frequency curve are obtained. We also analyze the affection of the system vibration response by changing the clearance and friction coefficient of the motion gap.By numerical analysis, of the two factors, motion subsidiary clearance and the crank intersection angle have huge influence on the organization. What's more, the frictional coefficient of the clearances is more important. We consider that our work offers theoretical reference for subsequent research and optimums design of the system.