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Passive energy balancing design for a linear actuated morphing wingtip structure / Jiaying Zhang; Chen Wang; Alexander Shaw; Mohammadreza Amoozgar; Michael Friswell

Aerospace Science and Technology, Volume: 107, Start page: 106279

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

  • Accepted Manuscript under embargo until: 19th October 2021

Abstract

A passive energy balancing concept for linear actuation is investigated in the current work by adopting a negative stiffness mechanism. The proposed negative stiffness mechanism uses a pre-tensioned spring to produce a passive torque and therefore to transfer the passive torque through a crankshaft...

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Published in: Aerospace Science and Technology
ISSN: 1270-9638
Published: Elsevier BV 2020
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa55484
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Abstract: A passive energy balancing concept for linear actuation is investigated in the current work by adopting a negative stiffness mechanism. The proposed negative stiffness mechanism uses a pre-tensioned spring to produce a passive torque and therefore to transfer the passive torque through a crankshaft for linear motion.The proposed passive energy balancing design is supposed to be applied in a morphing wingtip, of which the shape change comes from the elastic deformation of the morphing structure. A significant amount of linear actuation force can be required to deform the structure, and therefore it is important to reduce the required force and the consumed energy by adopting the passive energy balancing design.The kinematics of the negative stiffness mechanism is developed to satisfy the required linear motion and its geometry is then optimised to reduce the energy requirements. The performance of the optimised negative stiffness mechanism is evaluated through the net force and the total required energy, which shows the potential of the design in the morphing wingtip application.
Keywords: Negative stiffness mechanism, Kinematics tailoring, Energy balancing, Actuator efficiency, Morphing wingtip, Morphing aircraft
College: College of Engineering
Start Page: 106279