National Taiwan Ocean University Institutional Repository:Item 987654321/23771
English  |  正體中文  |  简体中文  |  Items with full text/Total items : 28588/40619
Visitors : 4189858      Online Users : 45
RC Version 4.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Adv. Search

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

Title: Simultaneously estimating the time-dependent damping and stiffness coefficients with the aid of vibrational data
Authors: Chein-Shan Liu;Jiang-Ren Chang;Kai-Huey Chang;Yung-Wei Chen
Contributors: NTOU:Department of Mechanical and Mechatronic Engineering
Keywords: Inverse vibration problem;Time-dependent damping and stiffness coefficients;Integrating factor;Lie-group estimation method
Date: 2008
Issue Date: 2011-10-20T08:08:12Z
Publisher: CMC: Computers Materials and Continua
Abstract: Abstract:For the inverse vibration problem a mathematical method is required to determine unknown parameters from the measurement of vibration data. When both damping and stiffness functions are identified, it is a rather difficult problem. In this paper we will propose a feasible method to simultaneously estimate both the time-dependent damping and stiffness coefficients through three mathematical transformations. First, the second-order equation of motion is transformed into a self-adjoint first-order system by using the concept of integrating factor. Then, we transform these two ODEs into two hyperbolic type PDEs. Finally, we apply a one-step group preserving scheme for the semi-discretizations of PDEs to obtain two uncoupled algebraic equations, of which the first one is used to estimate the damping coefficient while the second one is used to estimate the stiffness coefficient. The estimated results are acceptable for that used in vibrational engineering. We also discuss the use of velocity and acceleration data as inputs in the estimation. However, it leads to a bad result, and is not suggested for the use in estimation.
Relation: 7(2), pp.97-108
Appears in Collections:[Department of Mechanical and Mechatronic Engineering] Periodical Articles

Files in This Item:

File Description SizeFormat

All items in NTOUR are protected by copyright, with all rights reserved.


著作權政策宣告: 本網站之內容為國立臺灣海洋大學所收錄之機構典藏,無償提供學術研究與公眾教育等公益性使用,請合理使用本網站之內容,以尊重著作權人之權益。
網站維護: 海大圖資處 圖書系統組
DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback