Optimum Design of Compact Integrated Smart Hybrid Composites

研究了压电陶瓷和电流变液（ERF）作动器在复合碳纤维布梁振动控制中的应用。所得结果总结如下：(1)研究了由电流变液（ERF）和压电陶瓷驱动的混合智能复合梁的振动控制。制备了一种碳纤维增强塑料（CFRP）梁，并在正弦外激励下对其进行了测试。为了抑制悬臂组合梁自由端挠度，采用了四种反馈控制策略，分别针对电激振器和压电陶瓷作动器，解决了用线性控制理论求解最优控制策略的难题。讨论了两种作动器同时工作时控制策略的最佳组合。(2)研究了与(1)相同的混合智能组合梁的振动模糊控制。GFRP悬臂梁在强制正弦外激励下振荡。由于前文(1)所述的原因，形成了包含两个执行器的被控元件的模糊模型。采用神经-模糊混合系统对模糊模型参数进行辨识。在模糊模型的基础上，运用现代控制理论设计了组合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振动控制系统的效果。

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.