中国机械工程2024，Vol.35Issue(3)：405-413,9.DOI:10.3969/j.issn.1004-132X.2024.03.003
压电纤维致动柔性结构的仿鱼体波振动特性及流场分布研究
Vibration Mimicking Fish Body Wave and Flow Distribution of Underwater Flexible Structure with Resonant Actuation of Macro Fiber Composites
摘要
Abstract
This paper utilized the unique underwater vibration properties of smart flexible struc-tures to explore the body wave motion of carangiform fish,greatly impacting the prototype design and analysis of next-generation underwater vehicles.The second-order vibration mode shape of MFC-actu-ated flexible structures was employed to mimic the fish body wave motion of carangiform fish.The multiple normalized mode shapes of the MFC-actuated flexible structures were obtained using the as-sumed mode method,and the actual underwater second-order mode shape of the MFC-actuated struc-tures was obtained experimentally.This verifies that the second mode shape of the flexible structures approximates the fish body wave of the carangiform fish.The distributions of the instantaneous veloci-ty streamlines and concentrated pressure regions were revealed using CFD.Streamlines both for the inflow and outflow of the oscillating structure surfaces were observed from the simulation.The results show that:the flow directions before and after the node on the flexible structure second-order resonant states were opposite.Meanwhile,two pairs of high and low concentrated pressure regions are always on both sides of the oscillating structures.And the distributions of the high and low pressure regions are opposite before and after the node.In summary,positive pressure gradients always exist across the flexible structures,and the forward pressure component provides suggestive thrust for the oscillating flexible structures.Meanwhile,the lateral forces before and after the node induced by the pressure are in the opposite direction and are partially canceled out.Consequently,the lateral stability of the oscil-lating structures was enhanced.These results may benefit the design and performance improvement of underwater bionic propulsors and robotic fish.关键词
水下柔性结构/仿鱼体波振动/压电纤维/流场分布特性/计算流体动力学Key words
underwater flexible structure/vibration mimicking fish body wave/macro fiber com-posites(MFC)/flow field distribution characteristics/computational fluid dynamics(CFD)分类
信息技术与安全科学引用本文复制引用
温志伟,娄军强,陈特欢,崔玉国,魏燕定,李国平..压电纤维致动柔性结构的仿鱼体波振动特性及流场分布研究[J].中国机械工程,2024,35(3):405-413,9.基金项目
国家自然科学基金(52375103) （52375103）
浙江省自然科学基金(LGF21E050002) （LGF21E050002）
浙江省省属高校基本科研业务费专项资金(SJLY2021014) （SJLY2021014）
