Study On Dynamics Of Rolling Bearing By ANSYS/LS-DYNA

Rolling bearing is an important part of the drive system. The dynamics of the rolling bearing directly affect the life of the bearing and rotary precision, and thus indirectly affect the transmission system's accuracy?the reliability of indicators and the vibration noise. Therefore, in order to improve the precision of rolling bearing at work, to reduce the vibration noise of rolling bearing, to learn about the vibration characteristics of rolling bearing's fault, the simulation of rolling bearing dynamics,the study of rolling bearing in different structural parameters, geometric parameters and working parameters'dynamics and the failure of the rolling bearing vibration characteristics?the dynamics of the rolling bearing in the drive system has a very important significance.This article is based on the Changjiang Scholars and Innovative Research Team Project (IRT0816) and "high-end CNC machine tools and basic manufacturing equipment technology major projects" (2010ZX04014 014), The study is mainly based on ANSYS/LS-DYNA, using a multi-body contact dynamics method to simulate and analysis the simulation characteristics of the rolling bearing when it under the specific structural parameters, geometric parameters and working parameters. the major research is the each member in the displacement, velocity, acceleration, stress, contact force and the load distribution's variation. On the basis of prior, research failure vibration characteristics of the rolling bearing, Based on the main failure mode of rolling bearing (pitting), establish the finite element model of the rolling bearing with pitting failure in ANSYS, to further study of the rolling bearing's malfunction vibration characteristics, analysis of the stress concentration caused by pitting malfunction, the contact force and the vibration's changes. At last, use the method of envelope spectrum analysis for bearing fault diagnosis The study provides a theoretical basis for the rolling bearing's design and selection. The main contents of this paper are as follows:(1) Research the radial clearance's variation of rolling bearing, Study the influence of various parameters on the rolling bearing radial clearance, analyze the interference fit, the speed, the work load, the temperature, and the material of the linear expansion coefficient's influence on the rolling bearing radial clearance, which made a basic theory on how to select the rolling bearing's original radial clearance, and based on the derivation of the theory, design a fast solution on rolling bearing's original radial clearance with the Matlab GUI.(2) Set up the three-dimensional finite element model of rolling bearing based on the geometric relationship in ANSYS, combining with the project background working condition parameters of the load and speed. Make the dynamic simulation of rolling bearing comes true in ANSYS/LS-DYNA. Then use the LS-PrePost software to analyze and verify the correctness of the simulation results.(3) Based on ANSYS/LS-DYNA, Research the bearing structural parameters, the geometric parameters and working parameter's influence rule on the rolling bearing's dynamic characteristics.Find out the node's change rule in the displacement?speed acceleration?stress?contact force and the load distribution. Analysis of the influence rule of various parameters on the rolling bearing, provide a reliable theoretical basis for the rolling bearing's design and selection.(4) From the single bearing research to a transmission system with more bearings,, research bearing dynamics of multi-body contact system based on ANSYS/LS-DYNA, By applying Speed and torque, research the bearing's dynamic characteristics for further study.(5) Establish the finite element model of rolling bearing with pitting fault in the ANSYS, research the rolling bearing's fault vibration characteristics. Analysis of stress and strain change rule of fault bearing, compared with the normal rolling bearing's simulation results, analyze the influence of the fault on rolling bearing, and using the method of envelope spectrum analysis for bearing fault diagnosis.