Optimum Design of Compact Integrated Smart Hybrid Composites

研究了压电陶瓷和电流变液作动器在复合材料CFRP梁振动控制中的应用。主要研究结果如下：（1）研究了电流变液和压电陶瓷驱动器对混合智能复合材料梁的振动控制。制备了一种电流变液与粘贴压电陶瓷复合的碳纤维增强塑料（CFRP）梁，并对其进行了正弦激励试验。针对电流变液作动器的强非线性，难以应用线性控制理论进行最优控制的问题，分别采用电流变液和压电陶瓷作动器的四种反馈控制策略来抑制悬臂梁自由端的挠度。当两种执行器同时工作时，讨论了两种执行器控制策略的最优组合。(2)对研究（1）中所用的同一混杂智能复合材料梁进行了振动模糊控制研究。研究了玻璃钢悬臂梁在正弦外力激励下的振动问题。由于前面研究（1）中所述的原因，形成了包含两个执行器的受控元件的模糊模型。采用混合神经模糊系统辨识模糊模型参数。基于模糊模型，应用现代控制理论设计了复合材料梁振动抑制模糊控制器。通过仿真和实验验证了模糊控制器在振动控制系统中的应用效果。

The application of piezoceramics and electro-rheological fluids (ERF) actuators to vibration control of a composite CFRP beam was investigated. The results obtained are summarized as follows ;(1) Vibration control of a hybrid smart composite beam actuated by both electro-rheological fluids (abbreviated to ERF) and piezoceramic actuators was investigated. A carbon fiber reinforced plastics (CFRP) beam including interleaved ERF and bonded piezoceramics was prepared and tested under sinusoidal external excitations. Four kinds of feedback control strategies for both ERF and piezoceramic actuators were adopted to suppress the deflection at the free end of the cantilevered composite beam, because application of linear control theory to working out optimum control strategy was difficult owing to intense nonlinearity in ERF actuator. The optimum combination of these control strategies for two types of actuators was discussed when the two actuators operated simultaneously.(2) Fuzzy control of vibration was investigated for the same hybrid smart composite beam as used in the research (1). GFRP cantilevered beam was oscillated under the forced sinusoidal external excitation. Fuzzy model of controlled element containing two actuators was formed due to the reason desvribed in the previous study (1). Parameters of fuzzy model were identified by using a hybrid neuro-fuzzy system. Fuzzy controller for vibration suppression of the composite beam was designed based on the fuzzy model by using the modern control theory. The effect of vibration control system with a fuzzy controller was verified by simulation and experiment.