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Bidirectional Spiral Pulley Negative Stiffness Mechanism for Passive Energy Balancing / Jiaying Zhang; Alexander Shaw; Mohammadreza Amoozgar; Michael Friswell; Benjamin K. S. Woods

Journal of Mechanisms and Robotics, Volume: 11, Issue: 5, Start page: 054502

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

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DOI (Published version): 10.1115/1.4043818

Abstract

The energy balancing concept seeks to reduce actuation requirements for a morphing structure by strategically locating negative stiffness devices to tailor the required deployment forces and moments. One such device is the spiral pulley negative stiffness mechanism. This uses a cable connected with...

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Published in: Journal of Mechanisms and Robotics
ISSN: 1942-4302 1942-4310
Published: ASME International 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa51312
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Abstract: The energy balancing concept seeks to reduce actuation requirements for a morphing structure by strategically locating negative stiffness devices to tailor the required deployment forces and moments. One such device is the spiral pulley negative stiffness mechanism. This uses a cable connected with a pre-tension spring to convert the decreasing spring force into the increasing balanced torque. The kinematics of the spiral pulley is first developed for bidirectional actuation, and its geometry is then optimized by employing an energy conversion efficiency function. The performance of the optimized bidirectional spiral pulley is then evaluated through the net torque, the total required energy, and energy conversion efficiency. Then, an additional test rig tests the bidirectional negative stiffness property and compares the characteristics with the corresponding analytical result. Exploiting the negative stiffness mechanism is of significant interest not only in the field of morphing aircraft but also in many other energy and power reduction applications.
Keywords: Pulleys, Stiffness, Torque, Rotation, Springs, Cables, Kinematics
College: College of Engineering
Issue: 5
Start Page: 054502