检索结果-南通市图书馆

The effects of caudal fin deformation on the hydrodynamics of thunniform swimming under self-propulsion

Journal of Hydrodynamics 2020年第6期32卷 1122-1137页

作者： Yi-kun Feng Yu-min Su Huan-xing Liu Yuan-yuan Su College of Shipbuilding Engineering Harbin Engineering UniversityHarbin150001China Beijing Institute of Specialized Machinery Beijing100081China Science College Harbin Engineering UniversityHarbin150001China

To investigate the effects of the caudal fin deformation on the hydrodynamic performance of the self-propelled thunniform swimming,we perform fluid-body interaction simulations for a tuna-like swimmer with thunniform *** 3-D vortices are visualized to reveal the role of the leading-edge vortex(LEV)in the thrust *** comparing the swimming velocity of the swimmer with different caudal fin flexure amplitudes fa,it is shown that the acceleration in the starting stage of the swimmer increases with the increase of fa,but its cruising velocity *** results indicate that the caudal fin deformation is beneficial to the fast start but not to the fast cruising of the *** the entire swimming process,the undulation amplitudes of the lateral velocity and the yawing angular velocity decrease as fa *** is found that the formation of an attached LEV on the caudal fin is responsible for generating the low-pressure region on the surface of the caudal fin,which contributes to the ***,the caudal fin deformation can delay the LEV shedding from the caudal fin,extending the duration of the low pressure on the caudal fin,which will cause the caudal fin to generate a drag-type force over a time period in one swimming cycle and reduce the cruising speed of the swimmer.

关键词： Computational fluid dynamics(CFD)numerical simulation self-propulsion caudal fin deformation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Using spanwise flexibility of caudal fin to improve swimming performance for small fishlike robots

引用

Journal of Hydrodynamics 2018年第5期30卷 859-871页

作者： Dan Xia Wei-shan Chen Jun-kao Liu Xiang Luo School of Mechanical Engineering Southeast UniversityNanjing 211189China State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin 150001China

This paper examines the beneficial effects of the spanwise flexibility of the caudal fin for the improvement of the swimming performance for small fishlike robots. A virtual swimmer is adopted for controlled numerical experiments by varying the spanwise flexible trajectories and the spanwise flexible size of the caudal fin while keeping the body kinematics fixed. 3-D Navier-Stokes equations are used to compute the viscous flow over the robot. Elliptical, parabolic and hyperbola trajectories are chosen to describe the spanwise flexible profile of the caudal fin. According to the sign（positive or negative） of the phase difference of the swinging motion, the spanwise flexibility can be divided into the fin surface of ＂bow＂ and the fin surface of ＂scoop＂. It is observed that for both the fin surface of ＂bow＂ and the fin surface of ＂scoop＂, the spanwise elliptical trajectory has the optimal swimming velocity, thrust, lateral force, and efficiency. With comparisons, using the flexible caudal fin with the fin surface of ＂bow＂, the lateral force and the power consumption can be reduced effectively and the swimming stability can be increased while reducing little the swimming velocity and thrust. Meanwhile, using the flexible caudal fin with the fin surface of ＂scoop＂ can greatly improve the swimming velocity, thrust, and efficiency while increasing part of the lateral force and the power consumption. Three-dimensional flow structures clearly indicate the evolution process around the swimming robot. It is suggested that the fish, the dolphin, and other aquatic animals may benefit their hydrodynamic performance by the spanwise flexibility of the caudal fin.

关键词： Spanwise flexibility caudal fin fishlike robot swimming performance flow structures

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Shape optimization of the caudal fin of the three-dimensional self-propelled swimming fish

引用

Science China(Physics,Mechanics & Astronomy) 2013年第2期56卷 328-339页

作者： XIN ZhiQiang WU ChuiJie College of Mechanics and Materials Hohai University State Key Laboratory of Structural Analysis for Industrial Equipment & School of Aeronautics and Astronautics Dalian University of Technology

Shape optimization of the caudal fin of the three-dimensional self-propelled swimming fish,to increase the swimming efficiency and the swimming speed and control the motion direction more easily,is investigated by combining optimization algorithms,unsteady computational fluid dynamics and dynamic control in this *** 3D computational fluid dynamics package contains the immersed boundary method,volume of fluid method,the adaptive multi-grid finite volume method and the control strategy of fish *** shape optimizations of various swimming speeds,the results show that the optimal caudal fins of different swimming modes are not exactly the same ***,the optimal fish of high swimming speed,whose caudal fin shape is similar to the crescent,also have higher efficiency and better maneuverability than the other optimal bionic fish at low and moderate swimming ***,the mechanisms of vorticity creation of different optimal bionic fish are studied by using boundary vorticity-flux theory,and three-dimensional wake structures of self-propelled swimming of these fish are comparatively *** study of vortex dynamics reveals the nature of efficient swimming of the 3D bionic fish with the lunate caudal fin.

关键词： 3D bionic fish caudal fin shape optimization swimming performance vortex dynamics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hydrodynamics study of dolphin’s self-yaw motion realized by spanwise flexibility of caudal fin

引用

Journal of Ocean Engineering and Science 2022年第3期7卷 213-224页

作者： Zhihan Li Dan Xia Jiabo Cao Weishan Chen Xingsong Wang School of Mechanical Engineering Southeast UniversityNanjingJiangsu 211189China State Key Laboratory of Robotics and System Harbin Institute of TechnologyHarbin 150080China

The hydrodynamic performance of the virtual underwater vehicle under self-yaw is investigated numerically in this paper,we aim to explore the fluid laws behind this plane motion achieved by the bionic flexibility,especially the spanwise flexibility of the caudal *** kinematics of the chordwise flexible body and the spanwise flexible caudal fin are explored through dynamic mesh technology and user-defined functions(UDF).The 3-D Navier-Stokes equations are applied to simulate the viscid fluid surrounding the bionic *** study focuses on quantitative problems about the fluid dynamics behind the specific motion law,including speed of movement,energy loss and working *** current results show that the self-yaw can be composed of two motions,autonomous propulsion and active *** addition,the degree of the flexible caudal fin can produce different yaw *** chordwise phase differenceФis dominant in the propulsion function,while the spanwise phase differenceδhas a more noticeable effect on the steering *** pressure distribution on the surface of the dolphin and the wake vortex generated in the flow field reasonably reveal the evolution of *** properly turns out that the dolphin can combine the spanwise flexible caudal fin and the chordwise flexible body to achieve self-yaw motion.

关键词： Self-yaw dolphin Spanwise flexibility caudal fin Numerical simulation Hydrodynamic performance

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Topology Optimization of the caudal fin of the Three-Dimensional Self-Propelled Swimming Fish

引用

Advances in Applied Mathematics and Mechanics 2014年第6期6卷 732-763页

作者： Zhiqiang Xin Chuijie Wu College of Mechanics and Materials Hohai UniversityNanjing 210098China State Key Laboratory of Structural Analysis for Industrial Equipment&School of Aeronautics and Astronautics Dalian University of TechnologyDalian 116024China

Based on the boundary vorticity-flux theory,topology optimization of the caudal fin of the three-dimensional self-propelled swimming fish is investigated by combining unsteady computational fluid dynamics with moving boundary and topology optimization algorithms in this *** objective functional of topology optimization is the function of swimming efficiency,swimming speed and motion direction *** optimal caudal fin,whose topology is different from that of the natural fish caudal fin,make the 3D bionic fish achieve higher swimming efficiency,faster swimming speed and better *** boundary vorticity-flux on the body surface of the 3D fish before and after optimization reveals the mechanism of high performance swimming of the topology optimization bionic *** comparative analysis between the swimming performance of the 3D topology optimization bionic fish and the 3D lunate tail bionic fish is also carried out,and the wake structures of two types of bionic fish show the physical nature that the swimming performance of the 3D topology optimization bionic fish is significantly better than the 3D lunate tail bionic fish.

关键词： 3D bionic fish caudal fin topology optimization swimming performance vortex dynamics.

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Locomotion Energy Consumption Model for Robotic Fish with caudal fin Propulsion

Locomotion Energy Consumption Model for Robotic Fish with Ca...

引用

第40届中国控制会议

作者： Yan Shen Tian Deng Lilin Li Kuirui Shi Kai Wang School of Computer Science Chengdu University of Information Technology

The locomotion has become one of the important contributions to total energy consumption of robotic fish. Energy consumption generated by locomotion affects the cruising capability of robotic fish seriously. In the case of keeping the cruising velocity constant, a locomotion energy consumption model is proposed based on a classic dynamic model for robotic fish propelled by caudal fin. At first, the velocity model and propulsion model are derived by exploring the dynamic model of robotic fish. Secondly, the relationship between the locomotion energy consumption and the pendular parameters of caudal fin, including the frequency, amplitude and bias is established. finally, the simulations based on the proposed model and the related experiments are executed. The results show the relative errors of the locomotion energy consumption are less than 5% under different motion parameters by comparing the simulation results with experimental ones and the proposed model is effective.

关键词： robotic fish caudal fin locomotion energy consumption modeling

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：