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Design and test of an adjustable quasi-zero stiffness device and its use to suspend masses on a multi-modal structure

Alexander Shaw Orcid Logo, G. Gatti, P.J.P. Gonçalves, B. Tang, M.J. Brennan

Mechanical Systems and Signal Processing, Volume: 152, Start page: 107354

Swansea University Author: Alexander Shaw Orcid Logo

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DOI (Published version): 10.1016/j.ymssp.2020.107354

Abstract

In some applications, such as ground vibration testing in the aerospace industry, it is of interest to observe the modal behaviour of a slender structure while it is statically loaded. One way of statically loading such a structure is to suspend masses using very soft springs. If the springs are lin...

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Published in: Mechanical Systems and Signal Processing
ISSN: 0888-3270
Published: Elsevier BV 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa55861
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spelling 2021-02-15T15:48:03.4531571 v2 55861 2020-12-10 Design and test of an adjustable quasi-zero stiffness device and its use to suspend masses on a multi-modal structure 10cb5f545bc146fba9a542a1d85f2dea 0000-0002-7521-827X Alexander Shaw Alexander Shaw true false 2020-12-10 AERO In some applications, such as ground vibration testing in the aerospace industry, it is of interest to observe the modal behaviour of a slender structure while it is statically loaded. One way of statically loading such a structure is to suspend masses using very soft springs. If the springs are linear, then this results in an extremely large static deflection of the springs. This problem could be overcome by dynamically isolating the masses using quasi-zero stiffness (QZS) springs. This paper describes the design, construction and experimental testing of a device that can exhibit QZS. A novel design is proposed that allows the stiffness and the symmetry of the device to be adjusted independently using separate adjustment mechanisms. Quasi-static and dynamic testing of the device show that it can be adjusted to have an extremely low stiffness within the limits of measurement. The main trend of the force-displacement curve shows that it has a cubic stiffness characteristic, and that friction is responsible for its hysteretic behaviour. Dynamic testing shows that the device locks-up due to friction at low frequencies, but at high frequencies the device acts as an efficient linear isolator. An experiment was also performed where a mass was suspended on a multi-modal beam structure via the QZS device. It was shown that a static load could be applied to the beam without the attached mass appreciably affecting the dynamic response of the beam, even though the suspended mass was about 12% of that of the host structure. Journal Article Mechanical Systems and Signal Processing 152 107354 Elsevier BV 0888-3270 Quasi-zero stiffness, High-static-low-dynamic-stiffness, Nonlinear vibration, Vibration absorber 1 5 2021 2021-05-01 10.1016/j.ymssp.2020.107354 COLLEGE NANME Aerospace Engineering COLLEGE CODE AERO Swansea University 2021-02-15T15:48:03.4531571 2020-12-10T09:48:44.9825500 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering Alexander Shaw 0000-0002-7521-827X 1 G. Gatti 2 P.J.P. Gonçalves 3 B. Tang 4 M.J. Brennan 5 55861__18889__3609a646eef348109bc5a9d2a82b5287.pdf 55861.pdf 2020-12-15T12:02:36.1234619 Output 1733322 application/pdf Accepted Manuscript true 2021-12-05T00:00:00.0000000 ©2020 All rights reserved. All article content, except where otherwise noted, is licensed under a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND) true eng http://creativecommons.org/licenses/by-nc-nd/4.0/
title Design and test of an adjustable quasi-zero stiffness device and its use to suspend masses on a multi-modal structure
spellingShingle Design and test of an adjustable quasi-zero stiffness device and its use to suspend masses on a multi-modal structure
Alexander Shaw
title_short Design and test of an adjustable quasi-zero stiffness device and its use to suspend masses on a multi-modal structure
title_full Design and test of an adjustable quasi-zero stiffness device and its use to suspend masses on a multi-modal structure
title_fullStr Design and test of an adjustable quasi-zero stiffness device and its use to suspend masses on a multi-modal structure
title_full_unstemmed Design and test of an adjustable quasi-zero stiffness device and its use to suspend masses on a multi-modal structure
title_sort Design and test of an adjustable quasi-zero stiffness device and its use to suspend masses on a multi-modal structure
author_id_str_mv 10cb5f545bc146fba9a542a1d85f2dea
author_id_fullname_str_mv 10cb5f545bc146fba9a542a1d85f2dea_***_Alexander Shaw
author Alexander Shaw
author2 Alexander Shaw
G. Gatti
P.J.P. Gonçalves
B. Tang
M.J. Brennan
format Journal article
container_title Mechanical Systems and Signal Processing
container_volume 152
container_start_page 107354
publishDate 2021
institution Swansea University
issn 0888-3270
doi_str_mv 10.1016/j.ymssp.2020.107354
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering
document_store_str 1
active_str 0
description In some applications, such as ground vibration testing in the aerospace industry, it is of interest to observe the modal behaviour of a slender structure while it is statically loaded. One way of statically loading such a structure is to suspend masses using very soft springs. If the springs are linear, then this results in an extremely large static deflection of the springs. This problem could be overcome by dynamically isolating the masses using quasi-zero stiffness (QZS) springs. This paper describes the design, construction and experimental testing of a device that can exhibit QZS. A novel design is proposed that allows the stiffness and the symmetry of the device to be adjusted independently using separate adjustment mechanisms. Quasi-static and dynamic testing of the device show that it can be adjusted to have an extremely low stiffness within the limits of measurement. The main trend of the force-displacement curve shows that it has a cubic stiffness characteristic, and that friction is responsible for its hysteretic behaviour. Dynamic testing shows that the device locks-up due to friction at low frequencies, but at high frequencies the device acts as an efficient linear isolator. An experiment was also performed where a mass was suspended on a multi-modal beam structure via the QZS device. It was shown that a static load could be applied to the beam without the attached mass appreciably affecting the dynamic response of the beam, even though the suspended mass was about 12% of that of the host structure.
published_date 2021-05-01T04:10:22Z
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score 11.016235

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