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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| Format: | Article |
| Language: | English English |
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Elsevier
2014
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| Online Access: | 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 |
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| 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 |
| collection | UMP |
| 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. |
| first_indexed | 2024-03-06T11:45:14Z |
| format | Article |
| id | UMPir5737 |
| institution | Universiti Malaysia Pahang |
| language | English English |
| last_indexed | 2024-03-06T11:45:14Z |
| publishDate | 2014 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | UMPir57372016-01-08T01:31:33Z 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. (Published) http://dx.doi.org/10.1016/j.ijimpeng.2013.08.005 DOI:10.1016/j.ijimpeng.2013.08.005 |
| 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 |
| title | 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_short | 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 |
| topic | TJ Mechanical engineering and machinery |
| url | 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 |
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