As a vibration control technique, tuned mass damper (TMD) system has been shown to be effective in reducing the human‐induced vibration of a cross‐laminated timber (CLT) floor. However, the lightweight property of such a floor means there could be off‐tuning when its mass varies. This study therefore developed a steel‐based multi‐TMD (MTMD) system and a shape memory alloy (SMA)‐based MTMD system to reduce human‐induced vibration of the CLT floor. The superelastic SMA components can give the MTMD system more resilience and thus improve the robustness. Two 3‐TMD systems in different locations and 5‐TMD systems were designed to be effective within a certain bandwidth. The results show that SMA‐based 5‐TMDs are the most effective in reducing human‐induced vibration, for example, single‐person and two‐person slow walking, fast walking and running, as they can cover a wider frequency band. By contrast, the effectiveness of the steel‐based MTMD systems was unsatisfactory owing to permanent deformation of the steel components. When the loads on the CLT floor changed, the SMA‐based 5‐TMDs exhibited high robustness and were able to maintain the response at a low level. Test results show that a high‐frequency excitation could degrade the effectiveness of the MTMD, as this is beyond the effective bandwidth. Therefore, future investigations should focus on developing strategies to enlarge the bandwidth of the MTMD.

中文翻译：

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减少交叉层压木地板的人为振动—多重质量阻尼器系统的应用

作为一种振动控制技术，调谐质量阻尼器（TMD）系统已被证明可有效减少人为引起的交叉层压木（CLT）地板振动。但是，这种地板的轻质特性意味着其质量变化时可能会出现偏差。因此，本研究开发了一种基于钢的multi-TMD（MTMD）系统和一种基于形状记忆合金（SMA）的MTMD系统，以减少人为引起的CLT地板振动。超弹性SMA组件可以使MTMD系统具有更大的弹性，从而提高耐用性。设计了两个位于不同位置的3-TMD系统和5-TMD系统，以在一定带宽内有效。结果表明，基于SMA的5-TMD在减少人为振动方面最为有效，例如单人和两人慢走，快走和跑步，因为它们可以覆盖更宽的频带。相比之下，基于钢的MTMD系统的有效性由于钢部件的永久变形而不能令人满意。当CLT地板上的负载发生变化时，基于SMA的5-TMD表现出很高的耐用性，并且能够将响应保持在较低水平。测试结果表明，高频激励可能会降低MTMD的有效性，因为这超出了有效带宽。因此，未来的研究应集中于制定策略以扩大MTMD的带宽。基于SMA的5-TMD具有很高的鲁棒性，能够将响应保持在较低水平。测试结果表明，高频激励可能会降低MTMD的有效性，因为这超出了有效带宽。因此，未来的研究应集中于制定策略以扩大MTMD的带宽。基于SMA的5-TMD具有很高的鲁棒性，能够将响应保持在较低水平。测试结果表明，高频激励可能会降低MTMD的有效性，因为这超出了有效带宽。因此，未来的研究应集中于制定策略以扩大MTMD的带宽。