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Suspension-type tuned mass dampers with varying pendulum length to dissipate energy

机译：悬挂长度可调的悬挂式调谐质量阻尼器，以耗散能量

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In this paper, an optimal energy dissipation control algorithm is applied into a semi-active suspension-type tuned mass damper (SA-STMD) to suppress excessive vibration by means of variable pendulum length. The SA-STMD mechanism consists of a mass block, a suspension rope, and a movable fulcrum that can be a short tube driven by a linear motor to vertically move along the suspension rope. As the fulcrum goes up, the pendulum length is extended, resulting in a smaller stiffness of the SA-STMD, and vice versa. Accordingly, the restoring force in the SA-STMD can be adjusted by varying the fulcrum positions. In the case where the energy dissipation ability by the original STMDs is insufficient, the movable fulcrum in the SA-STMD system can compensate the STMDs for stiffness according to the proposed optimal energy dissipation control algorithm to provide controllable restoring forces. The controllable restoring forces are designed to act as viscous dampers that can make up for the lack of energy dissipation capacity. The numerical results from the time domain and frequency domain analyses show that the proposed approach utilizing the optimal energy dissipation control algorithm to adjust the pendulum length can induce controllable restoring forces with a butterfly-shaped hysteresis loop, supplying a sufficient energy dissipation capacity to reduce responses to the unexpectedly large external vibration. Another potential benefit is cost reduction because of use of a less number of conventional viscous dampers in the STMD system. Copyright © 2016 John Wiley & Sons, Ltd.
机译：本文将一种最优的能量耗散控制算法应用于半主动悬架式调谐质量阻尼器（SA-STMD），以通过可变的摆长来抑制过度振动。 SA-STMD机构由质量块，悬挂绳和可移动支点组成，可移动支点可以是由线性马达驱动以沿悬挂绳垂直移动的短管。随着支点的上升，摆的长度会延长，从而导致SA-STMD的刚度变小，反之亦然。因此，可以通过改变支点位置来调节SA-STMD中的恢复力。在原始STMD的能量耗散能力不足的情况下，SA-STMD系统中的可动支点可以根据建议的最优能量耗散控制算法补偿STMD的刚度，以提供可控的恢复力。可控制的恢复力被设计为充当粘性阻尼器，可以弥补能量消散能力的不足。时域和频域分析的数值结果表明，所提出的利用最佳能量耗散控制算法来调整摆长的方法可以通过蝶形磁滞回线产生可控的恢复力，从而提供足够的能量耗散能力以降低响应意外的大外部振动。另一个潜在的好处是由于在STMD系统中使用了较少数量的传统粘性阻尼器，从而降低了成本。版权所有©2016 John Wiley＆Sons，Ltd.

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