首页> 外文会议>21st Canadian Congress of Applied Mechanics(CANCAM 2007) >Finite Element Modeling and Vibration Control Simulation of a Slewing Nonlinear Flexible Beam Using Arrays of Sensors and Actuators
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Finite Element Modeling and Vibration Control Simulation of a Slewing Nonlinear Flexible Beam Using Arrays of Sensors and Actuators

机译:使用传感器和执行器阵列的回转非线性柔性梁的有限元建模和振动控制仿真

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摘要

The active control of flexible structures has been an active field of research for several decades, mainly due to the increased use of lightweight and lightly damped materials in flexible structures. In comparison to their rigid counterparts these structures present several advantages, such the high payload/weight ratio for power efficiency and fast maneuvering. However, due to their higher flexibility, they exhibit more pronounced vibrations. A viable solution to this problem is the use of arrays of distributed sensors and actuators, coupled with active control strategies, in order to enhance the stiffness and damping properties of the structure [1,2].In this paper, we introduce a new finite element (FE) technique and simulation design tool for static, dynamic, and control analysis of a highly flexible beam, undergoing nonlinear deformations due to fast slewing. Here, piezoelectric elements, which can be employed as discrete patches of lead zirconium titanate (PZT) or a uniform layer of polyvinylidene (PVDF), are used as actuators [3]. As sensors, Fiber Bragg Grating (FBGs) and accelerometers are considered. FBGs are novel optical sensors that are perfectly suited for distributed sensing of flexible structures, capable of providing hundreds of discrete strain (and temperature) measurements per every channel [4].
机译:主动控制柔性结构已经成为几十年来的研究热点,这主要是由于在柔性结构中越来越多地使用轻质和轻阻尼材料。与它们的刚性对应物相比,这些结构具有几个优点,例如,功率效率高,有效功率高,机动性强。但是,由于它们具有更高的柔韧性,它们表现出更明显的振动。解决此问题的可行方法是使用分布式传感器和执行器阵列,并结合主动控制策略,以增强结构的刚度和阻尼特性[1,2]。本文介绍了一种新的有限元方法。有限元(FE)技术和仿真设计工具,用于对高度柔性梁进行静态,动态和控制分析,该梁由于快速回转而遭受非线性变形。在这里,压电元件可以用作致动器[3],这些压电元件可以用作钛酸铅锆(PZT)的不连续贴片或聚偏二乙烯(PVDF)的均匀层。作为传感器,可以考虑使用光纤布拉格光栅(FBG)和加速度计。 FBG是新颖的光学传感器,非常适合柔性结构的分布式传感,能够在每个通道上提供数百个离散的应变(和温度)测量值[4]。

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