Impact Force Identification With Pseudo-Inverse Method on a Lightweight Structure for Under-Determined, Even-Determined and Over-Determined Cases

Force identification using inverse technique is important especially when direct measurement through force transducer is not possible. Considering the effects of impact excitation force on the integrity of a lightweight structure, impact force identification has become the subject of several studies...

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Main Authors:	Abdul Ghaffar, Abdul Rahman, Khoo, Shin Yee, Z., Ismail, Kong, K. K., Ong, Zhi Chao, Noroozi, Siamak, Chong, W. T.
Format:	Article
Language:	English English
Published:	Elsevier 2014
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://umpir.ump.edu.my/id/eprint/5737/ http://umpir.ump.edu.my/id/eprint/5737/ http://umpir.ump.edu.my/id/eprint/5737/ http://umpir.ump.edu.my/id/eprint/5737/1/fkm-2014-rahman-Impact_force_identification_abs_only.pdf http://umpir.ump.edu.my/id/eprint/5737/4/Impact%20Force%20Identification%20With%20Pseudo-Inverse%20Method%20on%20a%20Lightweight%20Structure%20for%20Under-Determined%2C%20Even-Determined%20and%20Over-Determined%20Cases.pdf

id	ump-5737
recordtype	eprints
spelling	ump-57372016-01-08T01:31:33Z http://umpir.ump.edu.my/id/eprint/5737/ Impact Force Identification With Pseudo-Inverse Method on a Lightweight Structure for Under-Determined, Even-Determined and Over-Determined Cases Abdul Ghaffar, Abdul Rahman Khoo, Shin Yee Z., Ismail Kong, K. K. Ong, Zhi Chao Noroozi, Siamak Chong, W. T. TJ Mechanical engineering and machinery Force identification using inverse technique is important especially when direct measurement through force transducer is not possible. Considering the effects of impact excitation force on the integrity of a lightweight structure, impact force identification has become the subject of several studies. A methodology utilising Operating Deflection Shape (ODS) analysis, Frequency Response Function (FRF) measurement and pseudo-inverse method to evaluate the dynamic force is presented. A rectangular plate with four ground supports was used as a test rig to simulate the motions of a simple vehicle body. By using the measured responses at remote points that are away from impact locations and measured FRFs of the test rig, unknown force locations and their time histories can be recovered by the proposed method. The performance of this approach in various cases such as under-determined, even-determined and over-determined cases was experimentally demonstrated. Good and bad combinations of response locations were selected based on the condition number of FRF matrix. This force identification method was examined under different response combinations and various numbers of response locations. It shows that in the over-determined case, good combination of response locations (i.e. low average of condition number of FRF matrix) and high number of response locations give the best accuracy of force identification result compared to under-determined and even-determined cases. Elsevier 2014-01 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/5737/1/fkm-2014-rahman-Impact_force_identification_abs_only.pdf application/pdf en http://umpir.ump.edu.my/id/eprint/5737/4/Impact%20Force%20Identification%20With%20Pseudo-Inverse%20Method%20on%20a%20Lightweight%20Structure%20for%20Under-Determined%2C%20Even-Determined%20and%20Over-Determined%20Cases.pdf Abdul Ghaffar, Abdul Rahman and Khoo, Shin Yee and Z., Ismail and Kong, K. K. and Ong, Zhi Chao and Noroozi, Siamak and Chong, W. T. (2014) Impact Force Identification With Pseudo-Inverse Method on a Lightweight Structure for Under-Determined, Even-Determined and Over-Determined Cases. International Journal of Impact Engineering, 63. pp. 52-62. ISSN 0734-743X http://dx.doi.org/10.1016/j.ijimpeng.2013.08.005 DOI:10.1016/j.ijimpeng.2013.08.005
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Abdul Ghaffar, Abdul Rahman Khoo, Shin Yee Z., Ismail Kong, K. K. Ong, Zhi Chao Noroozi, Siamak Chong, W. T. Impact Force Identification With Pseudo-Inverse Method on a Lightweight Structure for Under-Determined, Even-Determined and Over-Determined Cases
description	Force identification using inverse technique is important especially when direct measurement through force transducer is not possible. Considering the effects of impact excitation force on the integrity of a lightweight structure, impact force identification has become the subject of several studies. A methodology utilising Operating Deflection Shape (ODS) analysis, Frequency Response Function (FRF) measurement and pseudo-inverse method to evaluate the dynamic force is presented. A rectangular plate with four ground supports was used as a test rig to simulate the motions of a simple vehicle body. By using the measured responses at remote points that are away from impact locations and measured FRFs of the test rig, unknown force locations and their time histories can be recovered by the proposed method. The performance of this approach in various cases such as under-determined, even-determined and over-determined cases was experimentally demonstrated. Good and bad combinations of response locations were selected based on the condition number of FRF matrix. This force identification method was examined under different response combinations and various numbers of response locations. It shows that in the over-determined case, good combination of response locations (i.e. low average of condition number of FRF matrix) and high number of response locations give the best accuracy of force identification result compared to under-determined and even-determined cases.
format	Article
author	Abdul Ghaffar, Abdul Rahman Khoo, Shin Yee Z., Ismail Kong, K. K. Ong, Zhi Chao Noroozi, Siamak Chong, W. T.
author_facet	Abdul Ghaffar, Abdul Rahman Khoo, Shin Yee Z., Ismail Kong, K. K. Ong, Zhi Chao Noroozi, Siamak Chong, W. T.
author_sort	Abdul Ghaffar, Abdul Rahman
title	Impact Force Identification With Pseudo-Inverse Method on a Lightweight Structure for Under-Determined, Even-Determined and Over-Determined Cases
title_short	Impact Force Identification With Pseudo-Inverse Method on a Lightweight Structure for Under-Determined, Even-Determined and Over-Determined Cases
title_full	Impact Force Identification With Pseudo-Inverse Method on a Lightweight Structure for Under-Determined, Even-Determined and Over-Determined Cases
title_fullStr	Impact Force Identification With Pseudo-Inverse Method on a Lightweight Structure for Under-Determined, Even-Determined and Over-Determined Cases
title_full_unstemmed	Impact Force Identification With Pseudo-Inverse Method on a Lightweight Structure for Under-Determined, Even-Determined and Over-Determined Cases
title_sort	impact force identification with pseudo-inverse method on a lightweight structure for under-determined, even-determined and over-determined cases
publisher	Elsevier
publishDate	2014
url	http://umpir.ump.edu.my/id/eprint/5737/ http://umpir.ump.edu.my/id/eprint/5737/ http://umpir.ump.edu.my/id/eprint/5737/ http://umpir.ump.edu.my/id/eprint/5737/1/fkm-2014-rahman-Impact_force_identification_abs_only.pdf http://umpir.ump.edu.my/id/eprint/5737/4/Impact%20Force%20Identification%20With%20Pseudo-Inverse%20Method%20on%20a%20Lightweight%20Structure%20for%20Under-Determined%2C%20Even-Determined%20and%20Over-Determined%20Cases.pdf
first_indexed	2023-09-18T22:01:07Z
last_indexed	2023-09-18T22:01:07Z
_version_	1777414404845862912

Impact Force Identification With Pseudo-Inverse Method on a Lightweight Structure for Under-Determined, Even-Determined and Over-Determined Cases

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