Optimum placement of piezoelectric sensor/actuator for vibration control of laminated beams
Optimum placement of piezoelectric sensor/actuator for vibration control of laminated beams
复制标题
用于层合梁振动控制的压电传感器/执行器的最佳放置
作者：
Y. Kang;Hyunchul Park;W. Hwang;K. Han
对压电传感器/执行器的最佳配置进行了数值研究，并进行了实验验证。采用有限元法分析了压电陶瓷传感器/执行器层压复合梁的动力特性。在有限元建模过程中考虑了粘接层和压电陶瓷的阻尼和刚度。改变复合材料的刚度和阻尼特性的裁剪被使用。叠层复合梁的堆叠顺序为[θ 4 /0 2 /90 2] s，其中θ = 0、15、30、45、60、75和90度。附着在结构上的传感器/执行器改变了整个结构的质量、阻尼和刚度。因此，在柔性结构的振动控制中，传感器/执行器与结构之间的相互作用是非常重要的。选择模态阻尼（2ζω）作为更合适的性能指标，因为它与振动的沉降时间直接相关。结构阻尼指数（SDI）由模态阻尼定义。在SDI计算中考虑了每种振动模式的权重。传感器/执行器的最佳位置确定为SDI最大的点。数值模拟和实验结果表明，SDI取决于主机结构的外层光纤方向、传感器/执行器的位置和尺寸。
The optimum placement of a collocated piezoelectric sensor/actuator is investigated numerically and verified experimentally for vibration control of laminated composite beams. The finite element method is used for the analysis of dynamic characteristics of the laminated composite beams with the piezoceramic sensor/actuator. The damping and the stiffness of the adhesive layer and the piezoceramics are taken into account in the process of finite element modeling. Tailoring that varies the stiffness and the damping properties of the composite material is used. The stacking sequence of the laminated composite beam is [θ 4 /0 2 /90 2 ] s , where θ = 0, 15, 30, 45, 60, 75, and 90 deg. The sensor/actuator attached to a structure changes the mass, the damping, and the stiffness of the entire structure. Thus, interaction between sensor/actuator and structure is very important in the vibration control of a flexible structure. Modal damping (2ζω) is chosen as a more appropriate performance index, because it is directly related to the settling time of the vibration. The structural damping index (SDI) is defined from the modal damping. Weights for each vibrational mode are taken into account in the SDI calculation. The optimum location of the sensor/actuator is determined as the point where the SDI is maximum. Numerical simulation and experimental results show that the SDI depends on outer-layer fiber orientations of the host structure, the location, and the size of the sensor/actuator.