Free vibrational analysis of rectangular ducts with different joint conditions

Jade, Nagaraja and B, Venkatesham (2018) Free vibrational analysis of rectangular ducts with different joint conditions. Journal of Theoretical and Applied Mechanics, 56 (4). pp. 1069-1081. ISSN 1429-2955

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Rectangular ducts are fabricated using thin sheets of a metal with different joint conditions. Due to the presence of these joints, ducts deviate from their assumptive ideal shapes. The objective of the present work is to study the effect of different joint conditions and wall thickness on dynamic characteristics of the ducts. Experimental Modal Analysis (EMA) is performed on three rectangular ducts of different joint types. Numerical Modal Analysis (NMA) is also performed by considering that the ducts are of ideal rectangular shape (without joint condition). Correlation analysis is performed between EMA and NMA in terms of Modal Assurance Criteria (MAC), Relative Frequency Difference (RFD) plots and auto-MAC. It is observed that natural frequencies are in good agreement but there is a discrepancy in mode shapes.

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IITH Creators:
IITH CreatorsORCiD
B, Venkatesham
Item Type: Article
Uncontrolled Keywords: rectangular duct, duct joint, experimental modal analysis, modal assurance criteria
Subjects: Others > Mechanics
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: Team Library
Date Deposited: 06 Nov 2018 06:12
Last Modified: 06 Nov 2018 06:12
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