Energy based optimization of viscous–friction dampers on cables
Energy based optimization of viscous–friction dampers on cables
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DOI：
10.1088/0964-1726/19/4/045025
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发表时间：
2010-04
影响因子：
4.1
通讯作者：
F. Weber;C. Boston
中科院分区：
文献类型：
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作者：
F. Weber;C. Boston
本调查优化数值粘摩擦阻尼器连接到一个电缆接近一个电缆锚的总机械电缆能量在自由振动衰减测试的最快减少。优化参数为横向阻尼器粘性部分的粘性系数和摩擦部分的摩擦力与位移幅值之比。结果表明，一个几乎纯摩擦阻尼器与可忽略不计的小粘性阻尼产生最快的电缆能量减少整个衰减。最优摩擦阻尼器的摩擦力与位移幅值之比不同于能量等效最优粘滞阻尼器。其原因是摩擦阻尼器的非线性导致能量从激励模式溢出到10%量级的更高模式，即具有附接的摩擦阻尼器的缆索以若干频率振动。这就解释了为什么能量等效方法不能得到最佳的摩擦阻尼器。仿真数据的分析表明，最佳调谐的摩擦阻尼器耗散相同的能量，每个周期，如果每个模态分量的电缆被阻尼其相应的最佳线性粘滞阻尼器。
This investigation optimizes numerically a viscous–friction damper connected to a cable close to one cable anchor for fastest reduction of the total mechanical cable energy during a free vibration decay test. The optimization parameters are the viscous coefficient of the viscous part and the ratio between the friction force and displacement amplitude of the friction part of the transverse damper. Results demonstrate that an almost pure friction damper with negligibly small viscous damping generates fastest cable energy reduction over the entire decay. The ratio between the friction force and displacement amplitude of the optimal friction damper differs from that derived from the energy equivalent optimal viscous damper. The reason for this is that the nonlinearity of the friction damper causes energy spillover from the excited to higher modes of the order of 10%, i.e. cables with attached friction dampers vibrate at several frequencies. This explains why the energy equivalent approach does not yield the optimal friction damper. Analysis of the simulation data demonstrates that the optimally tuned friction damper dissipates the same energy per cycle as if each modal component of the cable were damped by its corresponding optimal linear viscous damper.