Author: Wu, Zhijing
Title: New-type vibration isolation structure design and performance analysis
Advisors: Jing, Xingjian (ME)
Huang, Wenhu (ME)
Li, Fengming (ME)
Wong, Wai On (ME)
Degree: Ph.D.
Year: 2016
Subject: Vibration.
Vibration -- Control.
Structural control (Engineering)
Hong Kong Polytechnic University -- Dissertations
Department: Department of Mechanical Engineering
Pages: vii, 173 pages : color illustrations
Language: English
Abstract: Vibration isolation has been a hot topic in engineering for many years. Many vibration control technologies including active vibration control, passive and semi-active vibration control are being used in practice to realize good vibration isolation performance of structures and mechanisms. Passive vibration control has the advantages of simple construction, low cost, easy maintenance and the absence of a need for external power. This thesis proposes and analyzes a new, passive vibration isolator design. Two kinds of passive control techniques used in the isolation structures adopted: (i) periodic structures (phononic crystal) which possess band-gap properties and (ii) nonlinear mechanisms with nonlinear stiffness characteristics. The band-gap property is a very significant characteristic of periodic structures in view of its structural and/or material periodicities. The elastic waves that can propagate in the structure in some frequency ranges are referred to as the pass band. However, sound and vibration propagation is forbidden for certain other frequency ranges, called stop bands. This property endows periodic structures with the potential to control wave propagation, thus helping to realize passive vibration isolation control. In this study, the spectral element method (SEM) is adopted for dynamic modeling of periodic structures. The interpolation function used in SEM is based on an Eigen function of the equation of motion that can provide exact solutions in the frequency domain. If the structure has uniform geometry and material properties, it can be considered as only one spectral element, which means that the element number and the degree of freedom (DOF) can be reduced significantly. High solution accuracy in the frequency domain and assuring the minimum DOF are the two main benefits derivable from SEM during a periodic structure analysis.
Rights: All rights reserved
Access: open access

Files in This Item:
File Description SizeFormat 
b29255946.pdfFor All Users3.34 MBAdobe PDFView/Open

Copyright Undertaking

As a bona fide Library user, I declare that:

  1. I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
  2. 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.
  3. 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.

Show full item record

Please use this identifier to cite or link to this item: