| 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: | Department of Mechanical Engineering |
| Pages: | xi, 71 leaves : ill. (chiefly col.) ; 30 cm. |
| Language: | English |
| 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. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b25768189.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 1.8 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/6907