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Energies 2015, 8(10), 10861-10882; doi:10.3390/en81010861

Effect of Various Excitation Conditions on Vibrational Energy in a Multi-Degree-of-Freedom Torsional System with Piecewise-Type Nonlinearities

1
Division of Mechanical and Automotive Engineering, Kongju National University, Cheonan-si, Chungcheongnam-do 314-701, Korea
2
School of Mechanical Engineering, Yeungnam University, Gyeongsan-si, Gyeongsangbuk-do 712-749, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Received: 31 August 2015 / Revised: 22 September 2015 / Accepted: 23 September 2015 / Published: 29 September 2015
(This article belongs to the Collection Wind Turbines)
View Full-Text   |   Download PDF [2278 KB, uploaded 29 September 2015]   |  

Abstract

Dynamic behaviors in practical driveline systems for wind turbines or vehicles are inherently affected by multiple nonlinearities such as piecewise-type torsional springs. However, various excitation conditions with different levels of magnitudes also show strong relationships to the dynamic behaviors when system responses are examined in both frequency and time domains. This study investigated the nonlinear responses of torsional systems under various excitations by using the harmonic balance method and numerical analysis. In order to understand the effect of piecewise-type nonlinearities on vibrational energy with different excitations, the nonlinear responses were investigated with various comparisons. First, two different jumping phenomena with frequency up- and down-sweeping conditions were determined under severe excitation levels. Second, practical system analysis using the phase plane and Poincaré map was conducted in various ways. When the system responses were composed of quasi-periodic components, Poincaré map analysis clearly revealed the nonlinear dynamic characteristics and thus it is suggested to investigate complicated nonlinear dynamic responses in practical driveline systems. View Full-Text
Keywords: harmonic balance method; multi-staged clutch damper; hysteresis; Poincaré map; quasi-periodic; piecewise-type nonlinearity; firing frequency harmonic balance method; multi-staged clutch damper; hysteresis; Poincaré map; quasi-periodic; piecewise-type nonlinearity; firing frequency
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yoon, J.-Y.; Kim, B. Effect of Various Excitation Conditions on Vibrational Energy in a Multi-Degree-of-Freedom Torsional System with Piecewise-Type Nonlinearities. Energies 2015, 8, 10861-10882.

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