Importance of Selecting a Suitable Analysis Frequency Range in Impact Force Identification for Automobile Test Rig

Abstract:

In this study, the effectiveness of selecting a suitable analysis frequency range in impact force identification is highlighted. A methodology that utilizesOperating Deflection Shape (ODS) analysis, Modal Analysis (MA) and Modal Transformation Method (MTM) to evaluate the dynamic force in three cases of analysis frequency ranges was presented. These three cases are the over-estimated, even-estimated, and under-estimated cases, which consist of higher, similar andlower analysis frequency range respectively, compared to the actual excitation frequency range. The performance of this approach was demonstrated via experiment. A Perspex plate with four ground supports was used as the automobile test rig. By measuring the acceleration response and Frequency Response Function (FRF) of the test rig, the time history of unknown force was recovered by the proposed method where the impact location was known in advance. It showed that the force identification result for even-estimated case falls within acceptable range while the force identification result for over-estimated and under-estimated cases isnot acceptable

• Periodical: Applied Mechanics and Materials (Volume 663)
• Pages: 88-92
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.663.88
• Online since: October 2014
• Authors: Khoo Shin Yee, Ong Zhi Chao, Kong Keen Kuan, Zubaidah Ismail, Chong Wen Tong, Siamak Noroozi, Abdul Ghaffar Abdul Rahman
• Keywords: Impact Force Identification, Modal Analysis, Modal Transformation Method

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