Estimating Rotational Frequency Response Function Using Mode Expansion and Frequency Response Function Synthesis Method

Authors

  • W.I.I. Wan Iskandar Mirza Structural Dynamics Analysis & Validation (SDAV), Faculty of Mechanical Engineering, Univesiti Teknologi MARA (UiTM), 40450 Shah Alam, Selangor, Malaysia
  • M.N. Abdul Rani Structural Dynamics Analysis & Validation (SDAV), Faculty of Mechanical Engineering, Univesiti Teknologi MARA (UiTM), 40450 Shah Alam, Selangor, Malaysia
  • M.A. Yunus Structural Dynamics Analysis & Validation (SDAV), Faculty of Mechanical Engineering, Univesiti Teknologi MARA (UiTM), 40450 Shah Alam, Selangor, Malaysia
  • D. Stancioiu Mechanical Engineering and Materials Research Centre, Liverpool John Moores University, Liverpool L3 3AF, UK
  • V. Shripathi #5AC, 961, Service Rd, 1st Block, Bank Avenue Colony, Horamavu, Bengaluru, 560043, India

DOI:

https://doi.org/10.15282/ijame.18.2.2021.11.0667

Keywords:

Rotational FRF, Mode expansion, SEREP, FRF synthesis

Abstract

The rotational frequency response function (RFRF) plays a crucial role in increasing the accuracy of the calculated results of the frequency-based substructuring method. However, RFRFs are often omitted due to the difficulties in the measurement process and limitations of the equipment. This paper presents a scheme of estimating the rotational FRF of an irregular plate structure using the FE model reduction and expansion method. The reduced FE model was introduced using the improved reduction system (IRS) and expanded to the experimental modal model (EMA model) using the system reduction and the expansion (SEREP) method. The FRF expanded method was then employed to derive the translational and rotational FRFs from the expanded EMA model. The accuracy of the expanded FRFs was evaluated with the EMA model of the irregular plate. It was found that the translational and rotational FRFs estimated from the proposed scheme were in good agreement with the EMA counterparts. Furthermore, the patterns of the estimated RFRFs were well correlated with the EMA RFRFs. This work shows that the proposed scheme may offer an attractive alternative way of accurately determining the RFRs of complex structures or structural components.

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Published

2021-06-17

How to Cite

Wan Iskandar Mirza, W., Abdul Rani, M. N. B., Yunus, M., Stancioiu, D., & Shripathi, V. (2021). Estimating Rotational Frequency Response Function Using Mode Expansion and Frequency Response Function Synthesis Method. International Journal of Automotive and Mechanical Engineering, 18(2), 8738 –. https://doi.org/10.15282/ijame.18.2.2021.11.0667

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Articles