讨论采用不同支撑结构的柔性梁的隔离问题

IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL
Jun-Ning Zhang  (, ), Xiao-Ye Mao  (, ), Hu Ding  (, ), Li-Qun Chen  (, )
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引用次数: 0

摘要

本研究通过分析讨论了承受不同支撑的柔性梁的应变和加速度抑制问题。作为传统的保护措施,梁安装在垂直线性弹簧上,同时并联一个线性阻尼器。这被称为线性隔离。为了提高隔离性能,在边界中采用了非线性。此外,还通过调整水平弹簧的安装长度,在非线性增强隔离的基础上建立准零隔离。为了全面、公正地讨论它们的性能,我们基于相同的参数研究了振幅、加速度、梁的势能、激励的输入功、梁的耗散功和沿梁的动态应力。比较结果表明,所有这些隔离装置都能高效地保护横梁,即使基底激励很小。虽然线性隔振和非线性增强隔振会在没有隔振的梁主共振两侧产生两个共振峰,但其最大振幅会大大减小。但对于低频激励,准零隔离性能最好,因为它能将主谐振推向高频区域。模拟结果表明,梁需要相对较软的隔振来避免冲击振动造成的损坏,包括准零隔振。一般来说,准零隔离性能最好。非线性增强型隔离装置是次优选择。本研究通过稳态响应和冲击振动显示了柔性梁的三种隔振能力。它为柔性梁的隔离提供了设计建议。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Discussion on isolation of flexible beams with various support configurations

This work discusses the strain and acceleration suppression of a flexible beam subjected to different supports analytically. As classical protection, the beam is mounted on a vertical linear spring together with a linear damper in parallel. This is called linear isolation. To enhance isolation performance, nonlinearity is employed in the boundary. In addition, quasi-zero isolation is established based on the non-linearly enhanced one by adjusting the installation length of the horizontal spring. To discuss their performance fully and fairly, the amplitude, the acceleration, the potential energy of the beam, the input work of the excitation, the dissipation work of the beam, and the dynamics stress along the beam are investigated based on the same parameters. The comparison shows that all these isolations can protect the beam with high efficiency, even when the basement excitation is tiny. Although the linear isolation and the nonlinearly enhanced one will arouse two resonance peaks on both sides of the primary resonance of the beam without isolation, the maximum amplitudes of them are reduced a lot. But for the low frequency excitation, the quasi-zero isolation has the best performance as it drives the primary resonance to the high frequency region. The simulation shows that the beam needs a relatively soft isolation to avoid the damage caused by the shock vibration, including the quasi-zero one. In general, the quasi-zero isolation shows the best performance. The nonlinearly enhanced one is the suboptimal choice. The present work shows the capacities of three isolations for a flexible beam by the steady-state response and the shock vibration. It provides design suggestions for the isolation of flexible beams.

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来源期刊
Acta Mechanica Sinica
Acta Mechanica Sinica 物理-工程:机械
CiteScore
5.60
自引率
20.00%
发文量
1807
审稿时长
4 months
期刊介绍: Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences. Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences. In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest. Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics
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