黏性流体环境中压电宏纤维致动柔性结构的流固耦合振动特性及试验

柔性结构与周围流体的耦合作用机制广泛应用于仿生机器人、水下航行器、精密仪器及生命医疗等领域.具有驱动变形大、防水性好且柔韧性好的压电宏纤维(Macro fiber composite,MFC)致动器是水下柔性结构变形控制的首选.建立MFC内部致动弯矩和水动力载荷共同作用下柔性结构的流固耦合动力学模型.对粘贴MFC致动器...

Analysis and Experiment of Fluid-structure Coupled Vibration of MFC-actuated Flexible Structure Immersed in Viscous Fluids

Hydraulic system and electro-mechanical system are widely used in aerospace, industry, non-road mobile machinery and other fields. In practice, the two systems are usually used separately. The electro-mechanical drive scheme has high energy efficiency, but poor carry capacity. The hydraulic drive scheme has high power density and fast dynamic response, but low energy efficiency. Therefore, combining the advantages of the two driving scheme, based on the integration design of the hydraulic cylinder and electro-mechanical actuator, a new type hydraulic-electric hybrid linear drive system is constructed. The working principle of the system is introduced. The coupling characteristics, the force dispute phenomenon and its effects of the two non-similar driving subsystems are analyzed. On this basis, a control scheme that electro-mechanical drive unit controls the system motion and hydraulic drive unit controls force is proposed. The research results show that adopting the proposed control scheme can reduce the coupling effect of two non-similar drive subsystems. By using the proposed control scheme, considerable position control performance can be achieved with low pressure loss. The new hybrid linear drive system will provide new ideas for the further development of hydraulic system and electro-mechanical system.