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Smooth cutting pattern generation technique for membrane structures using geodesic line on subplane and spline interpolation

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Journal of Central South University 2013年第11期20卷 3131-3141页

作者： SHON su-deok LEE Seung-jae LEE Kang-guk School of Architectural Engineering Korea University of Technology and Education Research Center for Building safety Kyungpook National University

Practical techniques for smooth geodesic patterning of membrane structures were *** the geodesic search,adjustment of the subplane of the extracted elements series was proposed,and various spline approximation methods were used to flatten the strip for the generation of a smooth *** search approach is very simple,and the geodesic line could be easily attained by the proposed method without the need for a difficult computation *** cutting patterning can also be generated by spline approximation without the noise in discrete nodal ***,the geodesic cutting pattern saved about 21%of the required area for the catenary model due to the reduction of the curvature of the planar pattern seam line.

关键词： membrane structures cutting pattern generation geodesic line spline interpolation triangular mesh sub-plane

GLOBAL STABILITY OF ENDEMIC EQUILIBRIUM POINT OF BASIC VIRUS INFECTION MODEL WITH APPLICATION TO HBV INFECTION

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Journal of Systems Science & Complexity 2010年第6期23卷 1221-1230页

作者： yu ZHENG Lequan MIN yu JI Yongmei su Yang KUANG Information Engineering School University of Science and Technology Beijing Beijing 100083 China. Mathematics and Physics School University of Science and Technology Beijing Beijing 100083 China. Department of Mathematics and Statistics Arizona State University Temp AZ 85287-1804 USA.

In this paper, the authors first show that if Ro ≤1, the infection free steady state is globally attractive by using approaches different from those given by Min, et a1.（2008）. Then the authors prove that if Ro 〉 1, the endemic steady state is also globally attractive. Finally, based on a patient＇s clinical HBV DNA data of anti-HBV infection with drug lamivudine, the authors establish an ABVIM. The numerical simulations of the ABVIM axe good in agreement with the clinical data.

关键词： Basic infection reproduction number clinical data simulation equilibrium point global stability HBV infection.

Theoretical study of particle and energy balance equations in locally bounded plasmas

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Plasma Science and Technology 2024年第12期26卷 89-98页

作者： Hyun-su JUN Yat Fung TSANG jae Ok YOO Navab SINGH Institute of Microelectronics(IME) Agency for ScienceTechnology and Research(A*STAR)Singapore 138634Republic of Singapore

In this study,new particle and energy balance equations have been developed to predict the electron temperature and density in locally bounded *** particle and energy balance equations assume that all plasma within a reactor is completely confined only by the reactor ***,in industrial plasma reactors for semiconductor manufacturing,the plasma is partially confined by internal reactor *** predict the effect of the open boundary area(A′_(L,eff))and ion escape velocity(u_(i))on electron temperature and density by developing new particle and energy balance ***,we found a low ion escape velocity(u_(i)/u_(B)≈0.2)and high open boundary area(A′_(L,eff)/A_(T,eff)≈0.6)to result in an approximately 38%increase in electron density and an 8%decrease in electron temperature compared to values in a fully bounded ***,we suggest that the velocity of ions passing through the open boundary should exceedω_(pi)λ_(De)under the condition E^(2)_(0)?(Φ/λ_(De))^(2).

关键词： particle balance equation energy balance equation low temperature plasmas

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

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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

Experimentation of Fish Swimming Based on Tracking Locomotion Locus

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Journal of Bionic Engineering 2008年第3期5卷 258-263页

作者： Hui Yan yu-min su Liang Yang Laboratory of Underwater Vehicle Harbin Engineering University Harbin 150001 P. R. China

There are many kinds of swimming mode in the fish world, and we investigated two of them, used by cyprinids and bulltrout. In this paper we track the locomotion locus by marks in different flow velocity from 0.2 m·s^-1 to 0.8 m·s^-1. By fit the data above we could find out the locomotion mechanism of the two kinds of fish and generate a mathematical model of fish kine- matics. The cyprinid fish has a greater oscillation period and amplitude compared with the bulltrout, and the bulltrout changes velocity mainly by controlling frequency of oscillation.

关键词： aquatic bionics bionic propulsion fish swimming analysis of locomotion tracking locus

Design,Mobility Analysis and Gait Planning of a Leech-like Soft Crawling Robot with Stretching and Bending Deformation

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Journal of Bionic Engineering 2023年第1期20卷 69-80页

作者： Manjia su Rongzhen Xie yu Qiu Yisheng Guan Biomimetic and Intelligent Robotics Lab(BIRL) School of Electromechanical EngineeringGuangdong University of TechnologyHEMCGuangzhou510006GuangdongChina

Soft climbing/crawling robots have been attracting increasing attention in the soft robotics community,and many prototypes with basic locomotion have been *** existing soft robots achieve locomotion by planar bending deformation and lack sufficient *** the mobility of soft climbing/crawling robots is still an open and challenging *** this end,we present a novel pneumatic leech-like soft robot,Leechbot,with both bending and stretching deformation for *** a morphological structure,the robot consists of a three-chambered actuator in the middle for the main motion,two chamber-net actuators that act as ankles,and two suckers at the ends for anchoring on *** peristaltic motion for locomotion is implemented by body stretching,and direction changing is achieved by body *** to the novel design and two deformation modes,the robot can make turns and transit between different surfaces;the robot,hence,has excellent *** development of the robot prototype is presented in detail in this *** control its motion,tests were carried out to determine the relationship between step length and air pressure as well as the relationship between motion speed and periodic delay time.A kinematic model was established,and the kinematic mobility and surface transitionability were *** planning based on the inflating sequence of the actuating chambers is presented for straight crawling,turn making,and transiting between surfaces and was verified by a series of experiments with the *** results show that a high mobility in soft climbing/crawling robots can be achieved by a novel design and by proper gait planning.

关键词： Biomimetic robot-Soft robot Climbing robot-Bio-inspiration-Kinematic mobility Gait planning

Evaluation on the interface characteristics,thermal conductivity,and annealing effect of a hot-forged Cu-Ti/diamond composite

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Journal of Materials Science & Technology 2020年第14期47卷 7-14页

作者： Lei Lei yu su Leandro Bolzoni Fei Yang Waikato Centre for Advanced Materials and Manufacturing School of EngineeringUniversity of WaikatoHamilton3240New Zealand

A Cu-1.5 wt.%Ti/Diamond(55 vol.%)composite was fabricated by hot forging from powder mixture of copper,titanium and diamond powders at 1050?C.A nano-thick TiC interfacial layer was formed between the diamond particle and copper matrix during forging,and it has an orientation relationship of(111)TiC//(002)Cu&[110]TiC//[110]Cuwith the copper *** analysis suggests that TiC is semicoherently bond with copper matrix,which helps reduce phonon scattering at the TiC/Cu interface and facilitates the heat transfer,further leading to the hot-forged copper/diamond composite(referred as to Cu-Ti/Dia-0)has a thermal conductivity of 410 W/m K,and this is about 74%of theoretical thermal conductivity of hot-forged copper/composite(552 W/m K).However,the formation of thin amorphous carbon layer in diamond particle(next to the interfacial TiC layer)and deformed structure in the copper matrix have adverse effect on the thermal conductivity of Cu-Ti/Dia-0 composite.800℃-annealing eliminates the discrepancy in TiC interface morphology between the diamond-{100}and-{111}facets of Cu-Ti/Dia-0 composite,but causes TiC particles coarsening and agglomerating for the Cu-Ti/Dia-2 composite and interfacial layer cracking and spallation for the Cu-Ti/Dia-1 *** addition,a large amount of graphite was formed by titanium-induced diamond graphitization in the Cu-Ti/Dia-2 *** these factors deteriorate the heat transfer behavior for the annealed Cu-Ti/Dia *** heat treatment needs to be continually investigated to improve the thermal conductivity of hot-forged CuTi/Dia composite by eliminating deformed structure in the copper matrix with limit/without impacts on the formed TiC interfacial layer.

关键词： Copper/diamond composite Hot forging Interface characteristics Thermal conductivity Heat treatment

A newly bio-inspired path planning algorithm for autonomous obstacle avoidance of UAV

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Chinese Journal of Aeronautics 2021年第9期34卷 199-209页

作者： Yaoming ZHOU yu su Anhuan XIE Lingyu KONG School of Aeronautic Science and Engineering Beihang UniversityBeijing 100191China Intelligent Robot Research Center ZHEJIANG LABZhejiang 311121China

In this paper,a bio-inspired path planning algorithm in 3 D space is *** algorithm imitates the basic mechanisms of plant growth,including phototropism,negative geotropism and *** algorithm proposed in this paper solves the dynamic obstacle avoidance path planning problem of Unmanned Aerial Vehicle(UAV)in the case of unknown environment *** with other path planning algorithms,the algorithm has the advantages of fast path planning speed and fewer route points,and can achieve the effect of low delay real-time path *** feasibility of the algorithm is verified in the Gazebo simulator based on the Robot Operating System(ROS)***,an actual UAV autonomous obstacle avoidance path planning experimental platform is built,and a UAV obstacle avoidance path planning flight test is carried out based on this actual environment.

关键词： Obstacle avoidance Path planning Plant growth ROS UAV

Numerical study of the influence of the atmospheric pressure on the thermal environment in the passenger cabin

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Building Simulation 2024年第2期17卷 253-265页

作者： Xin su yu Guo Zhengwei Long Yi Cao Tianjin Key Lab.of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin UniversityTianjin300072China Shanghai Aircraft Design and Research Institute Jinke RoadPudong DistrictShanghai201210China

The cabin air pressure remains lower than the horizontal atmospheric pressure when the airplane is in *** pressure is one of the parameters that must be taken into consideration while studying the thermal environment of an airplane *** are still no reference values for aircraft cabins despite the fact that numerous studies on low pressure heat transfer have demonstrated the connection between convective heat transfer coefficient(CHTC)and air *** this paper,a correction method for CHTC under low pressure conditions was established by using the dummy heat dissipation in the low-pressure cabin *** this basis,a thermal environment simulation model was developed,then was applied to the simulation of a seven-row aircraft cabin containing 42 passengers,and the CHTC and heat loss of dummy surface in the cabin were ***,the results of PMV calculated by using heat dissipation and air parameters at sampling points were *** results show that the modified CHTC can accurately reflect the cabin thermal environment under low pressure conditions,and the correction of CHTC can be realized by adjusting the turbulent Prandtl number,which is nonlinear correlated with the *** simulation results of the thermal environment in the seven-row cabin show that the CHTC changes by about 42%before and after *** air pressure decreases during take-off,which reduces the average CHTC of the crew surface from 5.09 W/(m^(2)·K)to 4.56 W/(m^(2)·K),but the air temperature rises by about 0.2°C as a *** deviation of PMV results calculated by using simulated heat loss data and using air parameters of measuring points in space is up to 0.5,but the latter is representative for calculating the thermal comfort level of the whole cabin.

关键词： low pressure aircraft cabin simulation heat dissipation convective heat transfer coefficient