Open AccessUsing Updated and Expanded Data to Estimate the Unmeasured Rotational Data of a Bolted Structure
Author(s) -
I.I. Wan Iskandar Mirza,
Andreas Kyprianou,
Muhamad Norhisham Bin Abdul Rani,
M. A. Yunus,
Rina Febrina
Publication year - 2022
Publication title -
international journal of automotive and mechanical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.311
H-Index - 25
eISSN - 2229-8649
pISSN - 2180-1606
DOI - 10.15282/ijame.19.1.2022.10.0729
Subject(s) - frequency response , modal , finite element method , rotational speed , test data , experimental data , modal analysis , mode (computer interface) , rotation around a fixed axis , structural engineering , engineering , acoustics , computer science , mathematics , physics , materials science , mechanical engineering , statistics , software engineering , electrical engineering , operating system , polymer chemistry
For frequency-based substructuring (FBS) to be accurate, translational and rotational data must be available at the connection points between substructures. However, obtaining rotational FRFs from experimental modal analyses is very difficult in practice. In this paper, an alternative method for estimating rotational FRFs is proposed using an approximated simplified finite element model (ASFE), modal updating, and mode expansion. The proposed approach was demonstrated on an assembled structure consisting of an irregular plate (test model) and a simple beam (FE model). The SEREP method was used to augment the translational and rotational FRFs to the updated ASFE mode shapes. The expanded rotational FRF of the test model was validated with the measured rotational FRF obtained from a piezoelectric direct rotational accelerometer. The results showed that the proposed approach for FBS correctly predicted the experimental FRF of the assembled structure with 90% accuracy. The FBS method is no longer dependent on the experimental rotational FRF, which is very difficult to measure with the methodology presented here.