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首页> 外文会议>Conference on Active and passive smart structures and integrated systems; 20090309-12; San Diego, CA(US) >Modal Analysis and Vibration Control of Smart Hull Structure in Underwater
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Modal Analysis and Vibration Control of Smart Hull Structure in Underwater

机译：水下智能船体结构的模态分析与振动控制

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摘要

Many research works have been conducted to investigate active vibration control of underwater structure using piezoelectric materials for the possible applications in the underwater vehicles and seashore structures. Recently, advanced anisotropic piezoceramic actuator named as Macro Fiber Composite (MFC) was developed in NASA Langley Research Center. MFC actuator is consisting of rectangular piezoceramic fibers and interdigitated electrode, which can provide great flexibility, large induced strain and directional actuating force. In this paper, vibration control performance of underwater smart hull structure with MFC actuator is evaluated. As a first step, dynamic modeling of underwater hull structure is conducted by using finite element technique and then modal characteristics of hull structure are investigated. For the verification of the proposed finite element model, numerical results of modal analysis are compared with those of experimental modal test results. In order to evaluate vibration control performance, linear quadratic Gaussian (LQG) controller is designed and experimentally implemented to the system. Control responses are evaluated in the water tank and presented in both time and frequency domain.
机译：已经进行了许多研究工作来研究使用压电材料的水下结构的主动振动控制，以用于水下车辆和海岸结构中。最近，在NASA兰利研究中心开发了名为各向异性纤维复合材料（MFC）的先进的各向异性压电陶瓷执行器。 MFC执行器由矩形压电陶瓷纤维和指状电极组成，可提供很大的柔韧性，较大的感应应变和方向致动力。本文评估了带有MFC执行器的水下智能船体结构的振动控制性能。第一步，采用有限元技术对水下船体结构进行动态建模，然后研究船体结构的模态特性。为了验证所提出的有限元模型，将模态分析的数值结果与实验模态测试结果进行了比较。为了评估振动控制性能，设计了线性二次高斯（LQG）控制器，并对该系统进行了实验性实现。在水箱中评估控制响应，并在时域和频域中进行显示。

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