Title: Entropy generation rate in a mechanical system subjected to a damped oscillation

Authors: M. Sunar; A.Z. Sahin; B.S. Yilbas

Addresses: Mechanical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia ' Mechanical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia ' Mechanical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia

Abstract: In the present study, thermodynamic analysis of entropy generation rate pertinent to damping oscillation of a mechanical system is carried out. The entropy generation rate is simulated, incorporating various oscillation characteristics, to examine the effects of natural and damped natural frequencies, initial displacement and velocity on exergy destruction rate. It is found that natural and damped natural frequencies of oscillation have significant effect on the entropy generation rate. Results show that reducing damped natural frequency and increasing natural frequency of oscillation increase the entropy generation rate. Increasing the initial displacement increases the rate of entropy generation; however, decay rate of entropy generation becomes independent of the initial displacement with progressing time.

Keywords: oscillation damping; entropy generation; exergy analysis; mechanical oscillation; thermodynamic analysis; simulation; natural frequencies; displacement; velocity; exergy destruction rate; decay rate.

DOI: 10.1504/IJEX.2015.071557

International Journal of Exergy, 2015 Vol.17 No.4, pp.401 - 411

Received: 29 May 2014
Accepted: 26 Jun 2014
Published online: 01 Sep 2015 *

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