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Hybrid vibration control of laminated composite structures using magnetostrictive and hard damping materials

机译：磁致伸缩和硬阻尼材料层压复合结构的混合振动控制

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Smart laminated composites with layers of magnetostrictive and/or piezoelectric materials have been explored for active damping applications. Active vibration control in laminated structures with low inherent damping, may lead to instability. In some other cases like flexible appendages of satellites, design considerations may impose constraints in collocated sensing and actuation in structure which would also cause degradation in system performance if only active control is used. Ideally, both structural damping and active control are desirable to achieve good dynamic performance. Of late, hard ceramic materials with hysteretic stress-strain behavior are used in passive vibration control. Because of high strain dependency of the damping in these materials, especially near the high damping regime, it is possible to enhance the amount of passive damping by active control of strain in the passive layer. Because of the layered structure in laminates, several interesting possibilities for hybrid damping exist and a few of them are proposed and explored in the present study. Smart composites with magnetostrictive (Terfenol-D) layers and strain dependent ceramic and/or ferroelectric Passive Damping(PD) layers are considered. The damping achieved in the PD layers is controlled by varying their location and/or the amount of gain in the active controller. Both frequency and time domain studies are carried out to investigate the performance of proposed hybrid damping systems. Simulations using recently developed smart beam elements are carried out on laminates with several configurations of active and passive layers. The simulation brings out the significance and the exploitation of strain dependency of passive damping on the overall damping of the hybrid system.
机译：已经探索了具有磁致伸缩和/或压电材料层的智能层压复合材料，用于有源阻尼应用。具有低固有阻尼的层压结构中的主动振动控制可能导致不稳定。在卫星的灵活附件中的其他情况下，设计考虑可能会在结构中施加在构件中的并置传感和致动中，这在仅使用有源控制时也会导致系统性能下降。理想情况下，理想的结构阻尼和主动控制都是理想的，以实现良好的动态性能。中期，具有滞后应力应变行为的硬陶瓷材料用于被动振动控制。由于在这些材料中的阻尼的高应变依赖性，特别是在高阻尼状态附近，可以通过在无源层中的应变控制来提高被动阻尼的量。由于层压板中的分层结构，存在杂种阻尼的几种有趣的可能性，并在本研究中提出和探索其中一些有趣的可能性。考虑具有磁致伸缩性（Terfenol-D）层和应变依赖性陶瓷和/或铁电无源阻尼（PD）层的智能复合材料。通过改变它们的位置和/或活性控制器中的增益量来控制在PD层中实现的阻尼。进行频率和时域研究，以研究提出的混合动力阻尼系统的性能。使用最近开发的智能梁元件的模拟在具有多个主动和无源层的层压板上进行。仿真提出了无源阻尼对混合系统总体阻尼的应变依赖性的重要性和开发。

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