Dynamic model updating of body-in-white structure using sensitivity analysis

A large and complex structure such as vehicle body-in-white (BIW) structure consists of several major components made from thin metal sheets that are joined together by several types of mechanical joint such as spot welds and bolted joints. Meanwhile, a finite element model of a structure is built t...

Full description

Saved in:

Bibliographic Details
Main Author:	Noor Am Zura, Abdullah
Format:	Thesis
Language:	English
Published:	2017
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://umpir.ump.edu.my/id/eprint/19775/19/Dynamic%20model%20updating%20of%20body-in-white%20structure%20using%20sensitivity%20analysis.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-ump-ir.19775
record_format	uketd_dc
spelling	my-ump-ir.197752022-01-07T00:00:58Z Dynamic model updating of body-in-white structure using sensitivity analysis 2017-07 Noor Am Zura, Abdullah TJ Mechanical engineering and machinery A large and complex structure such as vehicle body-in-white (BIW) structure consists of several major components made from thin metal sheets that are joined together by several types of mechanical joint such as spot welds and bolted joints. Meanwhile, a finite element model of a structure is built to predict the behaviour of the structure before fabrication of the structure. Experimental work will be performed on the fabricated structure and the measured data are compared with the computational analysis on its finite element model counterparts. However, in case of complex structure such as BIW, the finite element prediction is not always in good agreement with the experimental results due to inaccurate approximation of boundary condition, physical properties of the structure and meshing process. This thesis intends to focus on demonstrating a method called model updating in order to reduce the discrepancies. Initially, the finite element model of BIW structure is constructed in simplified manner. The first model is constructed without including any connecting elements to represent the mechanical joint components. In the next phase of modelling, beam element (CBAR) and spring connector element (CELAS) is included in the model to represent the joint components. The modal properties of the created finite element models of BIW is obtained and compared to the modal properties measured in experimental modal analysis. Experimental work involves the application of impact hammer test for measuring the modal response. Several approaches and set up are used during experimental work which includes different experimental set up and number of sensor used in measuring response, in order to ensure that the quality of the measured response is reliable for correlation purpose. Finally, the procedure of model updating on all created BIW model is performed with the aid of sensitivity analysis in order to identify the potential parameters to be chosen as the updating parameters. Initial percentage of error in all model are below 10%. After model updating procedure is performed on all BIW models, the average percentage of error in every mode are successfully reduced to below 5%, a significant level of improvement. Among all three updating work, the updating procedure performed on BIW model with joint elements shows better error reduction. At the end, the model updating procedure with the aid of sensitivity analysis on the selected parameters has proved to be an effective tool to reduce the discrepancies between prediction and experimental data and able to localize the source of inaccurate assumptions and uncertainties. 2017-07 Thesis http://umpir.ump.edu.my/id/eprint/19775/ http://umpir.ump.edu.my/id/eprint/19775/19/Dynamic%20model%20updating%20of%20body-in-white%20structure%20using%20sensitivity%20analysis.pdf pdf en public masters Universiti Malaysia Pahang Faculty of Mechanical Engineering
institution	Universiti Malaysia Pahang Al-Sultan Abdullah
collection	UMPSA Institutional Repository
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Noor Am Zura, Abdullah Dynamic model updating of body-in-white structure using sensitivity analysis
description	A large and complex structure such as vehicle body-in-white (BIW) structure consists of several major components made from thin metal sheets that are joined together by several types of mechanical joint such as spot welds and bolted joints. Meanwhile, a finite element model of a structure is built to predict the behaviour of the structure before fabrication of the structure. Experimental work will be performed on the fabricated structure and the measured data are compared with the computational analysis on its finite element model counterparts. However, in case of complex structure such as BIW, the finite element prediction is not always in good agreement with the experimental results due to inaccurate approximation of boundary condition, physical properties of the structure and meshing process. This thesis intends to focus on demonstrating a method called model updating in order to reduce the discrepancies. Initially, the finite element model of BIW structure is constructed in simplified manner. The first model is constructed without including any connecting elements to represent the mechanical joint components. In the next phase of modelling, beam element (CBAR) and spring connector element (CELAS) is included in the model to represent the joint components. The modal properties of the created finite element models of BIW is obtained and compared to the modal properties measured in experimental modal analysis. Experimental work involves the application of impact hammer test for measuring the modal response. Several approaches and set up are used during experimental work which includes different experimental set up and number of sensor used in measuring response, in order to ensure that the quality of the measured response is reliable for correlation purpose. Finally, the procedure of model updating on all created BIW model is performed with the aid of sensitivity analysis in order to identify the potential parameters to be chosen as the updating parameters. Initial percentage of error in all model are below 10%. After model updating procedure is performed on all BIW models, the average percentage of error in every mode are successfully reduced to below 5%, a significant level of improvement. Among all three updating work, the updating procedure performed on BIW model with joint elements shows better error reduction. At the end, the model updating procedure with the aid of sensitivity analysis on the selected parameters has proved to be an effective tool to reduce the discrepancies between prediction and experimental data and able to localize the source of inaccurate assumptions and uncertainties.
format	Thesis
qualification_level	Master's degree
author	Noor Am Zura, Abdullah
author_facet	Noor Am Zura, Abdullah
author_sort	Noor Am Zura, Abdullah
title	Dynamic model updating of body-in-white structure using sensitivity analysis
title_short	Dynamic model updating of body-in-white structure using sensitivity analysis
title_full	Dynamic model updating of body-in-white structure using sensitivity analysis
title_fullStr	Dynamic model updating of body-in-white structure using sensitivity analysis
title_full_unstemmed	Dynamic model updating of body-in-white structure using sensitivity analysis
title_sort	dynamic model updating of body-in-white structure using sensitivity analysis
granting_institution	Universiti Malaysia Pahang
granting_department	Faculty of Mechanical Engineering
publishDate	2017
url	http://umpir.ump.edu.my/id/eprint/19775/19/Dynamic%20model%20updating%20of%20body-in-white%20structure%20using%20sensitivity%20analysis.pdf
_version_	1783732048753590272

Dynamic model updating of body-in-white structure using sensitivity analysis

Similar Items