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Low Temperature Influence on the Behavior of Viscoelastic Layer of the Pounding Tuned Mass Damper

机译：低温对捣定调谐质量阻尼器粘弹性层行为的影响

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摘要

In previous studies, the pounding tuned mass damper (PTMD) has been successfully demonstrated to mitigate the undesired vibration of a variety of structures at room temperature. The advantages of the PTMD over the traditional tuned mass damper (TMD) has been verified through theoretical analysis and experimental investigations. However, the PTMD relies on an impact layer made of viscoelastic material to improve its vibration control performance and robustness against detuning effect. The energy dissipation of the viscoelastic material can be affected by the changes of environmental temperature. Therefore, this paper aims to study the impact damping behavior of the viscoelastic material in the low temperature environment of the sea bed where the PTMD is expected to control vibrations of subsea pipelines. The experimental apparatus fabricated in the previous study to generate and measure the lateral impact was housed inside a refrigerator. The experimental results indicate that the pounding stiffness decreased whereas the energy dissipation increased in the low temperature environment. Moreover, an impact fatigue test was also performed in the low temperature environment and compared with the room temperature case. Experimental results from a previous study show that the viscoelastic material was damaged after 36,000 cycles of impacts in the room temperature and a cyclic hardening–softening process was observed. However, in the low temperature environment, the viscoelastic material was damaged after 50,000 cycles of impacts and the cyclic hardening–softening process was not observed. As the impact cycle grew, the pounding stiffness decreased from 53,000 N/m to 17,000 N/m and the energy dissipation increased from 46.12 J/m per cycle to 65.4 J/m per cycle.
机译：在以前的研究中，已成功证明了磅调谐质量阻尼器（PTMD）可以减轻室温下各种结构的不良振动。通过理论分析和实验研究，证明了PTMD优于传统的调谐质量阻尼器（TMD）的优势。但是，PTMD依靠由粘弹性材料制成的冲击层来提高其振动控制性能和抵抗失谐效果的鲁棒性。粘弹性材料的能量耗散会受到环境温度变化的影响。因此，本文旨在研究粘弹性材料在海底低温环境中的冲击阻尼行为，在该环境中，PTMD有望控制海底管道的振动。在先前的研究中制造的用于产生和测量横向冲击的实验设备被放置在冰箱内。实验结果表明，在低温环境下，冲击刚度降低，而能量耗散增加。此外，还在低温环境下进行了冲击疲劳试验，并与室温情况进行了比较。先前研究的实验结果表明，粘弹性材料在室温下经过36,000次循环冲击后受到破坏，并且观察到了循环硬化-软化过程。但是，在低温环境下，粘弹性材料在50,000次冲击循环后被损坏，并且未观察到循环硬化-软化过程。随着冲击周期的增加，冲击刚度从53,000 N / m降低到17,000 N / m，能量消耗从每个周期的46.12 J / m增加到每个周期的65.4 J / m。

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