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research-article

Rotations of Pendulum when Its Pivot Oscillates Chaotically

[+] Author and Article Information
Sze-Hong Teh

Assistant Professor, Faculty of Engineering, University of Nottingham Malaysia Campus, Semenyih, Selangor, 43500, Malaysia
szehong.teh@nottingham.edu.my

Ko-Choong Woo

Associate Professor, Faculty of Engineering, University of Nottingham Malaysia Campus, Semenyih, Selangor, 43500, Malaysia
woo.ko-choong@nottingham.edu.my

Hazem Demrdash

Assistant Professor, Faculty of Engineering, University of Nottingham Malaysia Campus, Semenyih, Selangor, 43500, Malaysia
hazem.demrdash@nottingham.edu.my

1Corresponding author.

ASME doi:10.1115/1.4037595 History: Received December 23, 2016; Revised July 29, 2017

Abstract

This paper investigates the possibility of energy generation via pendulum rotations when the source of vertical excitation is chaotic in nature. The investigations are conducted using an additional height-adjustable mechanism housing a secondary spring to optimize a configuration of experimental pendulum setup. Chaotic oscillations of the pendulum pivot are made possible at certain excitation conditions due to a piecewise-linear stiffness characteristic introduced by the modification. A velocity control method is applied to maintain the rotational motion of the pendulum as it interacts with the vertical oscillator. The control input is effected by a motor, and a generator is used to quantify the energy extraction. The experimental results imply the feasibility of employing a pendulum device in a chaotic vibratory environment for energy harvesting purpose.

Copyright (c) 2017 by ASME
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