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A study of dynamic characteristics for crack identification

Experimental modal analysis has become a commonly-used technique for studying the dynamical behaviour of mechanical and civil structures. During a modal test, both the applied forces and vibration responses of the structure are measured when excited in one or more locations. Based on this data, a mo...

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Main Author: Mohd Shafiq Azrul, Azmi
Format: Undergraduates Project Papers
Language:English
Published: 2013
Subjects:
TP Chemical technology
Online Access:http://umpir.ump.edu.my/id/eprint/8664/1/12.A%20study%20of%20dynamic%20characteristics%20for%20crack%20identification.pdf
http://umpir.ump.edu.my/id/eprint/8664/
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spelling my.ump.umpir.86642023-03-08T07:06:39Z http://umpir.ump.edu.my/id/eprint/8664/ A study of dynamic characteristics for crack identification Mohd Shafiq Azrul, Azmi TP Chemical technology Experimental modal analysis has become a commonly-used technique for studying the dynamical behaviour of mechanical and civil structures. During a modal test, both the applied forces and vibration responses of the structure are measured when excited in one or more locations. Based on this data, a modalmodel of the structure, that essentially contains the same information as the original vibration data, is derived by means of system identification. The objective of this project is to detect crack using dynamic characteristics. Four set of specimen were tested with three of them have a different depth of crack which is 10%, 20% and 50%. The healthy specimen was used as baseline data to compare with the crack specimen. The aim of this thesis was to use the modal testing methods as a starting point to develop more advanced modal parameteridentification techniques.The data was collected usingDasylab software with a specified block diagram. First, the data of the beam will be used to simulate in the Algorsoftware in order to determine the natural frequency and mode shape of the beam. Experiment was done and the data will analysed by using ME Scope software. From the result, mode shape and natural frequency plays an important role in supporting result analysed by usingAlgor that will be used on Me Scope software.The data of simulation results will be guidelines for interpret data from experiment of modal testing. Five modes were determined and the value of natural frequency in each mode was increased respectively. If the value of natural frequency shifted means that the specimen was having crack on it. If the shifted is too much means that the specimen having a deeper crack. Then mode shape was used in order to validate whether the specimen is having crack or not. Mode shape 5 was too significant which is first bending mode in y direction compared to the other mode. If the mode shape is a 1st bending mode in y direction, and also natural frequency was shifted, then it shows that the specimen is having a crack on it.Finally, the modal testing method proves to be an effective method for crack identification. 2013-06 Undergraduates Project Papers NonPeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/8664/1/12.A%20study%20of%20dynamic%20characteristics%20for%20crack%20identification.pdf Mohd Shafiq Azrul, Azmi (2013) A study of dynamic characteristics for crack identification. Faculty of Mechanical Engineering, Universiti Malaysia Pahang.
institution Universiti Malaysia Pahang
building UMP Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaysia Pahang
content_source UMP Institutional Repository
url_provider http://umpir.ump.edu.my/
language English
topic TP Chemical technology
spellingShingle TP Chemical technology
Mohd Shafiq Azrul, Azmi
A study of dynamic characteristics for crack identification
description Experimental modal analysis has become a commonly-used technique for studying the dynamical behaviour of mechanical and civil structures. During a modal test, both the applied forces and vibration responses of the structure are measured when excited in one or more locations. Based on this data, a modalmodel of the structure, that essentially contains the same information as the original vibration data, is derived by means of system identification. The objective of this project is to detect crack using dynamic characteristics. Four set of specimen were tested with three of them have a different depth of crack which is 10%, 20% and 50%. The healthy specimen was used as baseline data to compare with the crack specimen. The aim of this thesis was to use the modal testing methods as a starting point to develop more advanced modal parameteridentification techniques.The data was collected usingDasylab software with a specified block diagram. First, the data of the beam will be used to simulate in the Algorsoftware in order to determine the natural frequency and mode shape of the beam. Experiment was done and the data will analysed by using ME Scope software. From the result, mode shape and natural frequency plays an important role in supporting result analysed by usingAlgor that will be used on Me Scope software.The data of simulation results will be guidelines for interpret data from experiment of modal testing. Five modes were determined and the value of natural frequency in each mode was increased respectively. If the value of natural frequency shifted means that the specimen was having crack on it. If the shifted is too much means that the specimen having a deeper crack. Then mode shape was used in order to validate whether the specimen is having crack or not. Mode shape 5 was too significant which is first bending mode in y direction compared to the other mode. If the mode shape is a 1st bending mode in y direction, and also natural frequency was shifted, then it shows that the specimen is having a crack on it.Finally, the modal testing method proves to be an effective method for crack identification.
format Undergraduates Project Papers
author Mohd Shafiq Azrul, Azmi
author_facet Mohd Shafiq Azrul, Azmi
author_sort Mohd Shafiq Azrul, Azmi
title A study of dynamic characteristics for crack identification
title_short A study of dynamic characteristics for crack identification
title_full A study of dynamic characteristics for crack identification
title_fullStr A study of dynamic characteristics for crack identification
title_full_unstemmed A study of dynamic characteristics for crack identification
title_sort study of dynamic characteristics for crack identification
publishDate 2013
url http://umpir.ump.edu.my/id/eprint/8664/1/12.A%20study%20of%20dynamic%20characteristics%20for%20crack%20identification.pdf
http://umpir.ump.edu.my/id/eprint/8664/
_version_ 1761616561354833920
score 13.211869

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