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扁壳结构的弯曲与扭转振动控制对该类结构的应用具有重要意义。本文采用不影响壳体结构的粗压电纤维复合材料(MFC)作动器对其弯曲与扭转振动进行主动控制。建立局部表面粘贴MFC作动器的开口圆柱扁壳的动力学解析模型,得到了作动力和作动力矩的解析表达式,分析了扁壳结构上MFC作动器在弯曲与扭转振动控制中的作动机理。针对一开口碳纤维圆柱扁壳,设计了模糊PD控制器,开展了定频与随机激励下壳体弯曲与扭转振动控制试验,并与传统PD控制试验效果进行了对比。结果表明:MFC作动器在壳体弯曲和扭转振动控制方面作动能力突出;模糊PD控制器的控制效果优于传统PD控制器的控制效果。
The bending and torsional vibration control of the flat shell structure is of great significance for the application of such structures. In this paper, the bending and torsional vibration are actively controlled by the coarse piezoelectric fiber composite actuator (MFC) that does not affect the shell structure. The dynamic analytical model of the open cylindrical shell with the local surface-mounted MFC actuator was established. The analytic expression of the power and the moment of action was obtained. The influence of the MFC actuator on the bending and torsional vibration control of the flat-shell structure was analyzed Actuation mechanism. For an open cylindrical carbon fiber cylinder, a fuzzy PD controller is designed. The bending and torsional vibration control tests of the shell under constant frequency and random excitation are carried out. The results are compared with those of conventional PD control test. The results show that the MFC actuator has prominent ability to control bending and torsional vibration of the shell. The control effect of the fuzzy PD controller is better than that of the traditional PD controller.