Impact Force Identification Using the Modal Transformation Method in Collocated and Noncollocated Cases

Abdul Ghaffar, Abdul Rahman and Khoo, Shin Yee and Zubaidah, Ismail and Kong, Keen Kuan and Ong, Zhi Chao and Chong, Wen Tong and Siamak, Noroozi (2014) Impact Force Identification Using the Modal Transformation Method in Collocated and Noncollocated Cases. Journal of Mechanical Engineering and Sciences (JMES) , 6. pp. 968-974. ISSN 2289-4659 (print); 2231-8380 (online). (Published)

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Previous impact force identification has focused on collocated cases because noncollocated cases tend to be ill-posed. Considering the impact location is inaccessible, impact force identification using remote responses away from the impact location must be developed. This study initiates an effort to examine impact force identification for non-collocated case. A methodology utilizing operating deflection shape analysis, modal analysis and the modal transformation method (MTM) is presented to identify the unknown dynamic force. The performance of this approach is examined via experimental verification. The objective of this study is to examine the effectiveness of impact force identification by using MTM for both collocated and non-collocated cases. By measuring the response and frequency response function of the test rig, the time history of the unknown force is recovered by the force identification method where the impact location is known. The proposed method is examined at Points 1 and 15, which have satisfactory and poor curve fitting results respectively. It is found that force accuracy improves when the curve fitting result is enhanced. Experimental results show that impact force identification via MTM is applicable in both collocated and noncollocated cases, only if the curve fitting results satisfactory.

Item Type: Article
Uncontrolled Keywords: Frequency response function; impact force identification; modal analysis; modal transformation method; operating deflection shape analysis
Subjects: T Technology > TJ Mechanical engineering and machinery
Faculty/Division: Faculty of Mechanical Engineering
Depositing User: Mrs. Neng Sury Sulaiman
Date Deposited: 26 Jul 2016 02:00
Last Modified: 26 Jul 2016 02:00
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