Simulation study on scissor-like element vibrations

Pao Yue-kong Library Electronic Theses Database

Simulation study on scissor-like element vibrations

 

Author: Xue, Baochuan
Title: Simulation study on scissor-like element vibrations
Degree: M.Sc.
Year: 2013
Subject: Vibration.
Vibration -- Mathematical models.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Mechanical Engineering
Pages: xi, 71 leaves : ill. (chiefly col.) ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2576818
URI: http://theses.lib.polyu.edu.hk/handle/200/6907
Abstract: This dissertation is mainly to model a scissor-like platform and to analyze the scissor-like element (SLE) for its performance in vibration isolation under different input force signals, focusing on how the suspension parameters influence vibration transmission in an inherent nonlinear manner. The existing research results have rarely investigated the vibration performance of the SLE's lift structure, and particularly fewer studies have explored the potential nonlinear vibration isolation performance of this kind of structures. Therefore, both simulation and theoretical analyses are carried out in this study to fulfill this objective. This dissertation is focused more on the derivation of a mathematical model of the mechanism and simulation analysis of the vibration transmission performance. Based on the dynamic characteristics identified from existing experimental results, a model of the scissor lift is developed. It is applied to investigate the effect of scissor structure stability on the imported force signal of the lift, to understand the mechanisms, and to analyze the structure isolation performance. Firstly, one-stage SLE is analyzed in both static and dynamic conditions, and then two-stage SLE is analyzed using the simultaneous constraint method. Then the model is created in the SolidWorks software, and is converted to the ADAMS environment according to the data interface the software provides. The next step is to add the constraint forces and drivers based on real motion. To achieve the vibration isolation performance, extensive simulations are carried out with necessary discussions and theoretical analysis. With MATLAB, we can easily obtain the detailed data under different cases, under which different springs and damping coefficients will be investigated for the analysis of vibration isolation performance. After comparisons and theoretical analysis, the effect of stiffness and damping coefficients on the vibration isolation is demonstrated, which provides a useful insight into the real analysis and design of nonlinear vibration isolators. It also shows its significance in enhancing the safety and stability of the SLE lift structures in practical applications.

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