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Impact of mode shapes on experimental loss factor estimation in automotive joints

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conference contribution
posted on 30.06.2021, 10:42 by Shaan SanjeevShaan Sanjeev, Daniel O'BoyDaniel O'Boy, Paul CunninghamPaul Cunningham, Steve Fisher
This paper presents the experimental work carried out on single-lap joints fastened together with bolts and nuts to investigate the contribution of mode shapes, and the effect that bolt sizes has in dissipating energy in built-up structures. Five different bolt sizes are chosen to assemble five single-bolted single-lap joints using aluminum plates. An analogous monolithic solid piece carved from the same aluminum material is used to determine the material damping and compare it against the damping from bolted joints. The dynamic response of all structures is captured under free-free boundary conditions, and the common modes are analyzed to understand the contribution and primary source of damping in the same range of the sampling frequency. This investigation has revealed that the source of damping in the joints is heavily linked to the mode shapes of the structure and structural damping (also referred to as material damping) contributes more during specific mode shapes compared to the joint damping itself. The findings allow a more accurate implementation of energy loss in automotive structures which contain bolted joints, allowing an implementation of both material and joint loss factor, respectively.

Funding

Engineering and Physical Sciences Research Council (EPSRC)

Jaguar Land Rover (JLR) Limited

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

Published in

SAE Technical Papers

Source

Noise and Vibration Conference and Exhibition, SAE International, 2021

Publisher

SAE International

Version

AM (Accepted Manuscript)

Rights holder

© SAE International

Publisher statement

This paper was accepted for publication in the SAE Technical Papers and the definitive published version is available at https://doi.org/10.4271/2021-01-1110

Acceptance date

30/06/2021

Publication date

2021-08-31

Copyright date

2021

ISSN

0148-7191

eISSN

2688-3627

Book series

Technical Paper 2021-01-1110

Language

en

Location

Grand Rapids, Michigan, USA

Event dates

7th September 2021 - 10th September 2021

Depositor

Dr Dan O'Boy. Deposit date: 30 June 2021

Article number

2021-01-1110

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