Department of Civil Engineering, University Putra Malaysia, Seri Kembangan, Malaysia.
Faculty of Environment and Technology, The University of The West England, Bristol, United Kingdom.
PLoS One. 2023 Aug 17;18(8):e0290248. doi: 10.1371/journal.pone.0290248. eCollection 2023.
Coulomb friction is considered as a mechanical approach to diminish the structural responses during the excitations. However, in case of severe oscillations supplementary mechanisms are employed besides the friction to mitigate the destructive effects of the vibrations in structures. Therefore, the main goal of this research is to develop a new Hybrid System (HS) which is a parallel combination of Viscous Damping (VD) and Coulomb friction for structures subjected to dynamic load. To achieve this goal, the effect of viscous damper is embedded in the equation of motion which is proposed by Den Hartog for a Single-Degree-of-Freedom (SDOF) Coulomb system, and has been extensively implemented for past few decades. In the considered numerical example in this study, implementing the proposed HDM in system resulted in decreasing the maximum displacement in the range of 1% to 98% for different amounts of force amplitude and viscous damping ratios. Also, applying the proposed HDM increased the time lag for about up to 24% for the frequency ratios greater than 1. The developed hybridized system in this study can be utilised as new generation of Tuned Mass Damper (TMD) to improve their energy dissipating efficiency under severe excitations.
库仑摩擦被认为是一种减小激励过程中结构响应的力学方法。然而，在严重的振动情况下，除了摩擦之外，还会采用其他补充机制来减轻结构振动的破坏性影响。因此，本研究的主要目标是开发一种新的混合系统 (HS)，它是粘性阻尼 (VD) 和库仑摩擦的并联组合，用于承受动态载荷的结构。为了实现这一目标，粘性阻尼器的效果被嵌入到由 Den Hartog 提出的单自由度 (SDOF) 库仑系统的运动方程中，该方程在过去几十年中得到了广泛的应用。在本研究中的数值示例中，在系统中实施所提出的 HDM 导致最大位移在不同的力幅值和粘性阻尼比范围内减少了 1%到 98%。此外，对于频率比大于 1 的情况，所提出的 HDM 增加了约 24%的时间滞后。本研究中开发的混合系统可以用作新一代调谐质量阻尼器 (TMD)，以在剧烈激励下提高其能量耗散效率。
