Studies of the performance of particle dampers under dynamic loads

Studies of the performance of particle dampers under dynamic loads
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动载荷下颗粒阻尼器的性能研究

DOI:
10.1016/j.jsv.2010.06.027
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发表时间:
2010-12
影响因子:
4.7
通讯作者:
Sami F. Masri
Sami F. Masri
中科院分区:
工程技术2区
文献类型:
--
作者:
Lu Zheng;Lu Zheng;Lu Xilin;Lu Xilin;Sami F. Masri;Sami F. Masri

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本文系统地研究了主系统(单自由度和多自由度)上附加颗粒阻尼器(竖向和水平)在不同动荷载(自由振动、平稳随机激励和非平稳随机激励、单分量和多分量)作用下的性能,确定了最佳工作区域。由于碰撞和摩擦耗散的能量的量,以及“有效动量交换”的概念被证明是合适的“全球”措施来解释粒子阻尼器的行为中所涉及的物理。利用离散元法,可以分析竖向颗粒阻尼器的运动,并将其分为三个不同的区域,并可以解释相关的阻尼特性。适当设计的颗粒阻尼器可以有效地控制多自由度主系统的第一阶模态,但是,高阶模态受其他参数的影响更大。因此,提出了广泛的参数研究,以评估各种系统参数的影响,如:质量比,主系统阻尼,恢复系数,容器尺寸,激励振幅和组件,输入位置和阻尼器的位置。
This paper presents a systematic investigation of the performance of particle dampers (vertical and horizontal) attached to a primary system (single-degree-of-freedom (SDOF) and multi-degree-of-freedom (MDOF)) under different dynamic loads (free vibration, stationary random excitation as well as nonstationary random excitation, with single component or multi-component), and the optimum operating regions are all determined. The amount of dissipated energy due to impact and friction, and the concept of “Effective Momentum Exchange” are shown to be suitable “global” measures to interpret the physics involved in the behavior of particle dampers. Using the well-established discrete element method, the motion of vertical particle dampers can be analyzed and classified into three different regions, and the associated damping characteristics can be interpreted. The first mode of a MDOF primary system can be effectively controlled by a properly designed particle damper; however, the higher modes are more affected by other parameters. Consequently, extensive parametric studies are presented to evaluate the effects of various system parameters, such as: mass ratio, primary system damping, coefficient of restitution, container dimensions, excitation amplitude and components, input locations and damper locations.
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