Analyzing free and forced vibration of flexible polyurethane foam using multiple time scales method
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- 作者：A. A. Pasha Zanoosi ; M. Haghpanahi…
- 关键词：Polyurethane foam ; Viscoelastic parameters ; Multiple time scales ; Free vibrations ; Forced vibrations
- 刊名：Journal of the Brazilian Society of Mechanical Sciences and Engineering
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：39
- 期：1
- 页码：207-217
- 全文大小：
- 刊物主题：Mechanical Engineering;
- 出版者：Springer Berlin Heidelberg
- ISSN：1806-3691
- 卷排序：39
文摘
Polyurethane foams are highly used in automotive and aerospace seats applications. In this study vibrational behavior of this foam is investigated. The dynamic of the system is cube of foam material, which is subjected to linear unidirectional motion. The foam is modelled as a single degree of freedom system. The governing equation of motion is an integro-differential equation. The novelty of the work is that multiple time scales method is used to study the approximate solution to the oscillation of the system. The motion of the system due to free and forced vibrations is identified. Primary resonances, non-resonant excitations, sub-harmonic and super harmonic cases were investigated. The response of system in each case is derived. Effects of viscoelastic parameters of foam on system behavior are then studied and the obtained results are illustrated through different figures.