Extracting mode shapes for beams through a passing auxiliary mass

This paper shows an approach to evaluate mode shapes for beams through using a passing auxiliary mass. The coupled system of an auxiliary mass passing over a beam is time-dependent, and the corresponding instantaneous frequencies (IFs) are equivalent to the mode shapes. Hence, reconstruction of the...

Full description

Saved in:
Bibliographic Details
Main Authors: Zhang, Yao, Zhao, Hai-Sheng, Lie, Seng-Tjhen
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2019
Subjects:
Online Access:https://hdl.handle.net/10356/104655
http://hdl.handle.net/10220/49505
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-104655
record_format dspace
spelling sg-ntu-dr.10356-1046552020-03-07T11:43:40Z Extracting mode shapes for beams through a passing auxiliary mass Zhang, Yao Zhao, Hai-Sheng Lie, Seng-Tjhen School of Civil and Environmental Engineering Mode Shapes Auxiliary Mass Engineering::Civil engineering This paper shows an approach to evaluate mode shapes for beams through using a passing auxiliary mass. The coupled system of an auxiliary mass passing over a beam is time-dependent, and the corresponding instantaneous frequencies (IFs) are equivalent to the mode shapes. Hence, reconstruction of the mode shapes is easy to be achieved through estimating the IFs. A simple algorithm based on ridge detection is proposed to reconstruct the mode shapes. This method is effective if the beam is light or the lumped mass is heavy. It is convenient since it requires an accelerometer mounted on the passing auxiliary mass rather than a serious of sensors mounted on the structure itself. It is also more practical because it is usually difficult to install external exciter. A lab-scale experimental validation shows that the new technique is capable of identifying the first three mode shapes accurately. 2019-08-01T04:16:04Z 2019-12-06T21:37:02Z 2019-08-01T04:16:04Z 2019-12-06T21:37:02Z 2019 Journal Article Zhang, Y., Zhao, H.-S., & Lie, S.-T. (2019). Extracting mode shapes for beams through a passing auxiliary mass. Journal of Vibration and Acoustics, 141(5), 054501-. doi:10.1115/1.4043542 1048-9002 https://hdl.handle.net/10356/104655 http://hdl.handle.net/10220/49505 10.1115/1.4043542 en Journal of Vibration and Acoustics © 2019 American Society of Mechanical Engineers. All rights reserved.
institution Nanyang Technological University
building NTU Library
country Singapore
collection DR-NTU
language English
topic Mode Shapes
Auxiliary Mass
Engineering::Civil engineering
spellingShingle Mode Shapes
Auxiliary Mass
Engineering::Civil engineering
Zhang, Yao
Zhao, Hai-Sheng
Lie, Seng-Tjhen
Extracting mode shapes for beams through a passing auxiliary mass
description This paper shows an approach to evaluate mode shapes for beams through using a passing auxiliary mass. The coupled system of an auxiliary mass passing over a beam is time-dependent, and the corresponding instantaneous frequencies (IFs) are equivalent to the mode shapes. Hence, reconstruction of the mode shapes is easy to be achieved through estimating the IFs. A simple algorithm based on ridge detection is proposed to reconstruct the mode shapes. This method is effective if the beam is light or the lumped mass is heavy. It is convenient since it requires an accelerometer mounted on the passing auxiliary mass rather than a serious of sensors mounted on the structure itself. It is also more practical because it is usually difficult to install external exciter. A lab-scale experimental validation shows that the new technique is capable of identifying the first three mode shapes accurately.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Zhang, Yao
Zhao, Hai-Sheng
Lie, Seng-Tjhen
format Article
author Zhang, Yao
Zhao, Hai-Sheng
Lie, Seng-Tjhen
author_sort Zhang, Yao
title Extracting mode shapes for beams through a passing auxiliary mass
title_short Extracting mode shapes for beams through a passing auxiliary mass
title_full Extracting mode shapes for beams through a passing auxiliary mass
title_fullStr Extracting mode shapes for beams through a passing auxiliary mass
title_full_unstemmed Extracting mode shapes for beams through a passing auxiliary mass
title_sort extracting mode shapes for beams through a passing auxiliary mass
publishDate 2019
url https://hdl.handle.net/10356/104655
http://hdl.handle.net/10220/49505
_version_ 1681036760208900096