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Research on Mechanical Performance and Dynamic Characteristics of Linear Motion Guide

Author: YangLei
Tutor: HuangQiBai
School: Huazhong University of Science and Technology
Course: Mechanical Design and Theory
Keywords: Linear Motion Guide Finite Element Method (FEM) Stress Analysis Modal Analysis Modal Test
CLC: TG502.3
Type: Master's thesis
Year: 2009
Downloads: 159
Quote: 2
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Abstract


Linear motion guide, as precision linear-oriented components, is an important function part in mechanical transmission. Linear motion guide is the key part in many automation equipments, especially in numerical control machine. The study on the stress distribution and mode shapes of linear motion guide is valuable to improve the vibration characteristics and structural optimization of it, and also is significant to enhance the accuracy of linear motion guide.Firstly, a FEA model of linear motion guide was established for contact stress analysis and analyzed by the finite element software MSC.NASTRAN. Then the stress-strain distributions of different loads were obtained. The result showed the position where the maximum stress occurred on the linear motion guide, and provided theoretical basis for structural optimization.Secondly, a FEA model which was simplified from geometric model was established for modal analysis. Then the modal frequencies and mode shapes in two boundary conditions including unrestrained and fixed guide way were acquired using the theoretic modal analysis. In the experimental modal analysis, the unrestrained boundary condition was simulated through two-point suspension method, and the other boundary condition was simulated by fixing the guide to the base whose stiffness is large. The modal frequencies and mode shapes were acquired by hammering method. The results of two methods were compared, which validated the validity of the finite element model.The achievement of thesis provides the FEA model for the research of linear motion guide. Stress analysis and modal analysis offer theoretical bases for structural optimization.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > General issues > Machine tool design, manufacture and maintenance > Machine tool structure
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