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Bidirectional torsional negative stiffness mechanism for energy balancing systems

Jiaying Zhang Orcid Logo, Alexander Shaw Orcid Logo, Mohammadreza Amoozgar, Michael Friswell, Benjamin K.S. Woods

Mechanism and Machine Theory, Volume: 131, Pages: 261 - 277

Swansea University Authors: Jiaying Zhang Orcid Logo, Alexander Shaw Orcid Logo, Mohammadreza Amoozgar, Michael Friswell

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DOI (Published version): 10.1016/j.mechmachtheory.2018.10.003

Abstract

A new concept of an integrated bidirectional torsional negative stiffness mechanism is introduced which allows for passive energy balancing of mechanical systems by reducing actuation requirements and improving energy efficiency. This novel design is a modular device, is bidirectional and is easily...

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Published in: Mechanism and Machine Theory
ISSN: 0094-114X
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa44946
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first_indexed 2018-10-18T13:20:32Z
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spelling 2018-11-26T12:36:11.3377018 v2 44946 2018-10-18 Bidirectional torsional negative stiffness mechanism for energy balancing systems 12b61893c794b14f11cf0a84cb947d0e 0000-0001-7308-5090 Jiaying Zhang Jiaying Zhang true false 10cb5f545bc146fba9a542a1d85f2dea 0000-0002-7521-827X Alexander Shaw Alexander Shaw true false 56910e9937b39a1a96d6252845c385d3 Mohammadreza Amoozgar Mohammadreza Amoozgar true false 5894777b8f9c6e64bde3568d68078d40 Michael Friswell Michael Friswell true false 2018-10-18 EEN A new concept of an integrated bidirectional torsional negative stiffness mechanism is introduced which allows for passive energy balancing of mechanical systems by reducing actuation requirements and improving energy efficiency. This novel design is a modular device, is bidirectional and is easily integrated and customised for different applications. The energy balance concept is achieved by employing a negative stiffness system to couple with a positive stiffness system of the mechanical system to create a zero stiffness system which can be driven with lower energy requirements. The bidirectional torsional negative stiffness mechanism proposed here uses a series of pre-compressed springs around a bidirectional torque shaft to convert decreasing force in the springs into increasing torque output through geometric reconfiguration to generate the negative stiffness characteristic. The kinematics of the negative stiffness mechanism were derived and a physical model was assembled from LEGO® components for validation. An analytical model was developed for prediction and the numerical results showed that a satisfactory performance can be generated to match the torque requirements. An experimental demonstrator was then built and tested to verify the predictions from the analysis. To show the impact of the energy balancing concept on actuator efficiency, a representative case study is made of a tendon-driven morphing active camber mechanism. The performance of the optimised bidirectional negative stiffness device is investigated to shows an improvement by the kinematics tailoring. Journal Article Mechanism and Machine Theory 131 261 277 0094-114X Negative stiffness mechanism, Bidirectional torsional, Kinematics tailoring, Energy balancing, Actuator efficiency 31 12 2019 2019-12-31 10.1016/j.mechmachtheory.2018.10.003 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2018-11-26T12:36:11.3377018 2018-10-18T09:17:08.4770286 Jiaying Zhang 0000-0001-7308-5090 1 Alexander Shaw 0000-0002-7521-827X 2 Mohammadreza Amoozgar 3 Michael Friswell 4 Benjamin K.S. Woods 5 0044946-18102018125520.pdf zhang2018(10)v2.pdf 2018-10-18T12:55:20.2800000 Output 2864278 application/pdf Accepted Manuscript true 2019-10-12T00:00:00.0000000 true eng
title Bidirectional torsional negative stiffness mechanism for energy balancing systems
spellingShingle Bidirectional torsional negative stiffness mechanism for energy balancing systems
Jiaying Zhang
Alexander Shaw
Mohammadreza Amoozgar
Michael Friswell
title_short Bidirectional torsional negative stiffness mechanism for energy balancing systems
title_full Bidirectional torsional negative stiffness mechanism for energy balancing systems
title_fullStr Bidirectional torsional negative stiffness mechanism for energy balancing systems
title_full_unstemmed Bidirectional torsional negative stiffness mechanism for energy balancing systems
title_sort Bidirectional torsional negative stiffness mechanism for energy balancing systems
author_id_str_mv 12b61893c794b14f11cf0a84cb947d0e
10cb5f545bc146fba9a542a1d85f2dea
56910e9937b39a1a96d6252845c385d3
5894777b8f9c6e64bde3568d68078d40
author_id_fullname_str_mv 12b61893c794b14f11cf0a84cb947d0e_***_Jiaying Zhang
10cb5f545bc146fba9a542a1d85f2dea_***_Alexander Shaw
56910e9937b39a1a96d6252845c385d3_***_Mohammadreza Amoozgar
5894777b8f9c6e64bde3568d68078d40_***_Michael Friswell
author Jiaying Zhang
Alexander Shaw
Mohammadreza Amoozgar
Michael Friswell
author2 Jiaying Zhang
Alexander Shaw
Mohammadreza Amoozgar
Michael Friswell
Benjamin K.S. Woods
format Journal article
container_title Mechanism and Machine Theory
container_volume 131
container_start_page 261
publishDate 2019
institution Swansea University
issn 0094-114X
doi_str_mv 10.1016/j.mechmachtheory.2018.10.003
document_store_str 1
active_str 0
description A new concept of an integrated bidirectional torsional negative stiffness mechanism is introduced which allows for passive energy balancing of mechanical systems by reducing actuation requirements and improving energy efficiency. This novel design is a modular device, is bidirectional and is easily integrated and customised for different applications. The energy balance concept is achieved by employing a negative stiffness system to couple with a positive stiffness system of the mechanical system to create a zero stiffness system which can be driven with lower energy requirements. The bidirectional torsional negative stiffness mechanism proposed here uses a series of pre-compressed springs around a bidirectional torque shaft to convert decreasing force in the springs into increasing torque output through geometric reconfiguration to generate the negative stiffness characteristic. The kinematics of the negative stiffness mechanism were derived and a physical model was assembled from LEGO® components for validation. An analytical model was developed for prediction and the numerical results showed that a satisfactory performance can be generated to match the torque requirements. An experimental demonstrator was then built and tested to verify the predictions from the analysis. To show the impact of the energy balancing concept on actuator efficiency, a representative case study is made of a tendon-driven morphing active camber mechanism. The performance of the optimised bidirectional negative stiffness device is investigated to shows an improvement by the kinematics tailoring.
published_date 2019-12-31T03:56:27Z
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score 11.013731

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