Issue 15, 2021

Impedance matching in an elastic actuator

Abstract

We optimize the performance of an elastic actuator consisting of an active core in a host which performs mechanical work on a load. The system, initially with localized elastic energy in the active component, relaxes and distributes energy to the rest of the system. Using the linearized Mooney-Rivlin hyperelastic model in a cylindrical geometry and assuming viscous relaxation, we show that the value of Young's modulus of the impedance matching host which maximizes the energy transfer from the active component to the load is the geometric mean of Young's moduli of the active component and the elastic load. This is similar to the classic results for impedance matching for maximizing the transmittance of light propagating through dielectric media.

Graphical abstract: Impedance matching in an elastic actuator

Article information

Article type
Paper
Submitted
25 Jan 2021
Accepted
17 Mar 2021
First published
18 Mar 2021

Soft Matter, 2021,17, 4191-4194

Author version available

Impedance matching in an elastic actuator

T. Guo, X. Zheng and P. Palffy-Muhoray, Soft Matter, 2021, 17, 4191 DOI: 10.1039/D1SM00132A

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