• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2021, Vol. 57 ›› Issue (22): 376-385.doi: 10.3901/JME.2021.22.376

• 交叉与前沿 • 上一篇    下一篇

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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

黄珏皓1, 娄军强1,2, 杨依领1, 陈特欢1, 陈海荣1, 魏燕定2   

  1. 1. 宁波大学机械工程与力学学院 宁波 315211;
    2. 浙江大学浙江省先进制造技术重点实验室 杭州 310027
  • 收稿日期:2020-11-06 修回日期:2021-06-25 出版日期:2021-11-20 发布日期:2022-02-28
  • 通讯作者: 娄军强(通信作者),男,1986年出生,博士,副教授。主要研究方向为振动主动控制、水下仿生机器人及柔性结构流固耦合振动。E-mail:loujunqiang@nbu.edu.cn
  • 作者简介:黄珏皓,男,1996年出生,硕士研究生。主要研究方向为柔性结构流固耦合振动及振动控制。E-mail:nbumechanical115@163.com;魏燕定,男,1970年出生,博士,教授,博士研究生导师。主要研究方向为电力工业、自动化技术、机械工业。E-mail:weiyd@zju.edu.cn
  • 基金资助:
    国家自然科学基金(51975517,52075273,51805276)、浙江省自然科学基金(LY20E050007)和浙江省省属高校基本科研业务费专项资金(SJLY2021014)资助项目。

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

HUANG Juehao1, LOU Junqiang1,2, YANG Yiling1, CHEN Tehuan1, CHEN Hairong1, WEI Yanding2   

  1. 1. School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo 315211;
    2. Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province, Zhejiang University, Hangzhou 310027
  • Received:2020-11-06 Revised:2021-06-25 Online:2021-11-20 Published:2022-02-28

摘要: 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致动器的柔性结构特征截面进行计算流体动力学(Computational fluid dynamics,CFD)分析,得到不同振动特征频率下柔性结构周围流场、压力分布及所受水动力载荷,分别拟合得到MFC致动柔性结构水动力函数的实部和虚部表达式。结果表明柔性结构水动力载荷的附加质量和阻尼效应都随着振动频率的增加而减小。在等振动特征频率下,MFC致动梁结构水动力函数的实部大于匀质等截面梁的实部;在高振动频率下其水动力函数虚部同样大于匀质等截面梁。试验测试了MFC致动柔性结构的水下振动特性,试验所得MFC激励下柔性结构末端稳定振动的幅频特性和相频特性与建立的耦合动力模型相吻合,证实了所建立MFC致动柔性结构的水动力函数及流固耦合振动模型的有效性。

关键词: 水下柔性结构, 流固耦合, 水动力函数, 压电宏纤维, 动力学模型, 频响特性

Abstract: 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.

Key words: underwater flexible structure, fluid-structure coupled, hydrodynamic function, Macro fiber composite(MFC), dynamic model, frequency response

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