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Effects of flight parameters for plant protection UAV on droplets deposition rate based on a 3D simulation approach

International Journal of Agricultural and Biological Engineering 2023年第1期16卷 66-72页

作者： Lifeng Xu Zhongzhu Yang Zusheng Huang Weilong ding Gerhard Buck-Sorlin College of Computer Science&Technology Zhejiang University of TechnologyHangzhou 310026China IRHS INRAEAGROCAMPUS OUESTUniversite d’AngersSFR 4207 QUASAV42 rue Georges Morel49071 BeaucouzécedexFrance

With the development of aviation agricultural technology,the number of farmers adopting the use of drones in daily agricultural activities is growing rapidly in recent decades.Among these,a large portion constitutes agricultural drones being used in pest control and crop protection practices,e.***.agriculture spraying of pesticides.Spraying pesticides with drones have proven to be faster than other traditional methods.On the downside,flight time and range of Unmanned Aerial Vehicles(UAV)are often limited.Thus,a proper arrangement of flight height and velocity will greatly improve spraying efficiency.A new strategy to optimize the flight parameters,i.***.flight height and flight velocity,for fixed-wing UAV with a 3D simulation-based approach together with an automatic optimization algorithm was proposed in this study.To find the optimal parameters for a UAV to fly and spray under certain environmental conditions,a three-dimensional model of the target crop was established first,followed by a detailed simulation of droplet spraying.As a demonstration case,a grass model was developed and used as the target plant,and a physics-based method was used to simulate realistically the movement of the droplets in the air as well as the interaction between the droplets and the plant to obtain the droplet deposition rate under the specified operating parameters.Furthermore,the standard Particle Swarm Optimization(PSO)algorithm was used to optimize the UAV operating parameters to obtain the best operating parameters.The results indicate that using the standard PSO algorithm to optimize the operating parameters of the drone could significantly improve the deposition rate and find the best operating parameters.

关键词： unmanned aerial vehicle droplet deposition 3D simulation particle swarm optimization algorithm

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3d Cohesive Finite Element Minimum Invasive Surgery simulation Based on Kelvin‑Voigt Model

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Chinese Journal of Mechanical Engineering 2022年第3期35卷 161-173页

作者： Yonghang Jiang Qinghua Song Xichun Luo Centre for Precision Manufacturing Department of Design Manufacturing&Engineering ManagementUniversity of StrathclydeGlasgow G11XJUK Key Laboratory of High Efficiency and Clean Mechanical Manufacture Ministry of EducationSchool of Mechanical EngineeringShandong UniversityJinan 250013China

Minimally invasive surgery is an important technique used for cytopathological examination.Recently,multiple studies have been conducted on a three-dimensional(3d)puncture simulation model as it can reveal the internal deformation state of the tissue at the micro level.In this study,a viscoelastic constitutive equation suitable for muscle tissue was derived.Additionally,a method was developed to define the fracture characteristics of muscle tissue material during the simulation process.The fracture of the muscle tissue in contact with the puncture needle was simulated using the cohesive zone model and a 3d puncture finite element model was established to analyze the deformation of the muscle tissue.The stress nephogram and reaction force under different parameters were compared and analyzed to study the deformation of the biological soft tissue and guide the actual operation process and reduce pain.

关键词： Minimally invasive surgery Constitutive model 3D simulation Cohesive zone model

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Numerical simulation of a combined oxidation ditch flow using 3d k-ε turbulence model

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Journal of Environmental Sciences 2005年第5期17卷 808-812页

作者： LUO Lin LI Wei-min dENG Yong-sen WANG Tao State Key Laboratory of Hydraulics Sichuan University Chengdu 610065 China College of Municipal Construction and Environmental Engineering Chongqing University Chongqing 400045 China

The standard three dimensional（3d） k-ε turbulence model was applied to simulate the flow field of a small scale combined oxidation ditch. The moving mesh approach was used to model the rotor of the ditch. Comparison of the computed and the measured data is acceptable. A vertical reverse flow zone in the ditch was found, and it played a very important role in the ditch flow behavior. The flow pattern in the ditch is discussed in detail, and approaches are suggested to improve the hydrodynamic performance in the ditch.

关键词： oxidation ditch 3D simulation turbulence flow

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3d组态技术在舞台车台控制系统中的研究与应用

3D组态技术在舞台车台控制系统中的研究与应用

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作者：杨智刚兰州理工大学

学位级别：硕士

本文以甘肃工大舞台技术工程有限公司为背景,针对当前舞台机械监控系统存在的主要问题：第一、基于二维组态技术,人机监控界面交互性差、动画呆板;第二、利用编程语言开发的监控系统价格比较昂贵且不符合中国人的操作习惯。因此,本文从... 详细信息

本文以甘肃工大舞台技术工程有限公司为背景,针对当前舞台机械监控系统存在的主要问题：第一、基于二维组态技术,人机监控界面交互性差、动画呆板;第二、利用编程语言开发的监控系统价格比较昂贵且不符合中国人的操作习惯。因此,本文从工程实际出发,开发了一套基于GENESIS64组态技术的舞台车台3d监控软件。选取国内市场上流行的工业控制计算机研华IPC-610H型工控机作为上位机;现场总线为工业以太网总线,其数据传输速度为lOMBps,保证了自行式车台之间、自行式车台与上位机之间的数据接收与发送即时且准确。监控软件主要模块包括：系统组态,数据库组态,控制策略表组态,人机界面组态。基于ICONICS GENESIS64的3d虚拟舞台车台监控系统,生成更加人性化、交互性强以及高效的人机监控界面。根据演出剧目要求,预先设置车台运行轨迹参数。然后对车台运行轨迹进行模拟仿真并修正轨迹参数,直到符合要求为止。最后生成车台运行轨迹控制策略表,对现场车台运行轨迹下达控制命令。同时根据OPC (OLE for Process Control)接口上传的位置信息、速度信息、姿态信息实时数据,在线监测车台的运行状态。无线通讯是一个极为复杂的过程。自行式车台处于强噪声干扰的环境中,其干扰源种类繁杂且幅值强大,SNR (Signal to Noise Ratio)一般在0dB以下。强噪声对自行式车台之间、自行式车台与上位机之间的数据通讯造成极为严重的影响,数据极易发生畸变、丢失等。最终导致数据精度下降,出现误操作。本文详细分析了EMd(Empirical Mode decomposition)、SVd (Singular Value decomposition)差分谱理论。将EMd-SVd联合去噪算法应用于滤波处理中,实验表明,该方法能有效地应用于强噪声干扰环境下的信号去噪。

关键词：舞台车台 3d组态技术 3D simulation EMd-SVd差分谱 OPC通讯接口

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simulation of 3d Heat and Mass Transfer in Glass and Oxide Melts Using the Inductive Skull Melting Technology

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Journal of Iron and Steel Research(International) 2012年第S1期19卷 99-105页

作者： NACKE Bernard NIEMANN Benjamin SCHLESSELMANN dirk Institute of Electrotechnology Leibniz Universitt HannoverWilhelm-Busch-Str.4Hannover D-30167Germany Auer Lighting Hildesheimer Str.35Bad Gandersheim D-37581Germany

The inductive skull melting technology has many advantages for melting of innovative materials in the field of glasses and oxides.It offers high processing temperatures and the compliance of necessary purities at the same time. Applicable materials are in particular optical glasses,which are applied for lenses,fibers or filters,because the skull melting technology allows high process temperatures and high purities of the final product.In the production of glass materials strong requirements have to be fulfilled regarding the optical characteristics,which are mainly defined and influenced by the melting of the raw material and the following refining process.An unsolved problem in the melting process of glasses and oxides using the inductive skull melting technology was in the past the unknown heat and mass transfer in the melt because temperature and melt flow measurements in the melt are practically impossible due to the high temperatures.On the other hand the temperature and velocity distribution in the melt is very important regarding the safety of the melting process,the process control for producing the required properties of the material or the further development of skull melting installations.The paper describes a new numerical model which is able to simulate the instationary 3d melt flow of glasses and oxides.The numerical model takes into account electromagnetic,convection and Marangoni forces.By this a comprehensive view of the hidden processes in the practical experiments could be obtained. By means of the new numerical model different glass and oxide melting processes were simulated and the results were compared with experimental results.The comparisons show first of all a very good agreement between experimental and numerical results at the melt surfaces.Additionally the numerical results allow to look much deeper inside the melt and show interesting new effects of the heat and mass transfer below the melt surface which were unknown before.

关键词： inductive skull melting oxide melting glass melting 3D simulation electromagnetic simulation melt flow simulation

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A 3D simulation System for Wireless Communication

A 3D Simulation System for Wireless Communication

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2012年计算机应用与系统建模国际会议

作者： Jingbo Mao Lin Wang Yan Meng The Second Artillery College Wuhan Communication Academy

The paper discussed the key techniques to build 3D simulation environment for wireless communication system based on Vega Prime and HLA. The LOd with 2d symbols and size-keeping rendering for communication entities are designed to improve the usability and intelligibility. The invisible electromagnetic wave beams are categorized by their vivid shapes and constructed by the extension of VSG, then the elaborate line-step-alpha and sine-alpha strip textures are built and rendered dynamically to represent the flowing wave. These flexible and applicable strategies are applied to integrate the complex user space environment associated with the land, sea, air, space and electronic scenarios.

关键词： 3D simulation Wireless Communication Wireless Wave Beam Vega Prime

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Three-dimensional simulation of fabrication process-dependent effects on single event effects of SiGe heterojunction bipolar transistor

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Chinese Physics B 2017年第8期26卷 542-550页

作者：张晋新贺朝会郭红霞李培郭宝龙吴宪祥 School of Aerospace Science and Technology Xidian UniversityXi'an 710126China School of Energy and Power Engineering Xi'an jiaotong UniversityXi'an 710049China Northwest Institution of Nuclear Technology Xi'an 710024China

The fabrication process dependent effects on single event effects （SEEs） are investigated in a commercial silicon- germanium heterojunction bipolar transistor （SiGe HBT） using three-dimensional （3d） TCAd simulations. The influences of device structure and doping concentration on SEEs are discussed via analysis of current transient and charge collection induced by ions strike. The results show that the SEEs representation of current transient is different from representation of the charge collection for the same process parameters. To be specific, the area of C/S junction is the key parameter that affects charge collection of SEE. Both current transient and charge collection are dependent on the doping of collector and substrate. The base doping slightly influences transient currents of base, emitter, and collector terminals. However, the SEEs of SiGe HBT are hardly affected by the doping of epitaxial base and the content of Ge.

关键词： SiGe HBT single event effects fabrication process dependence 3D simulation

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3d Computer simulations of Resin Molding

3D Computer Simulations of Resin Molding

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第十三届国际复合材料会议

作者： P.Saj ABB Corporate Research Kraków POLAND

＜正＞simulation of injection molding process of thermosetting materials is one of the very interesting areas where advanced hardware and software must be used. Such computer simulations provide useful information to detect molding problems prior to mold making, such as premature gelation, undesired weld-line locations and air traps. The computer simulations based on FEM and FVM （finite elements and finite volumes methods） help mold designers to determine gate locations, part size and they support process engineers in identifying process conditions （filling time, inlet temperature, mold wall temperature）.

关键词： curing RTM 3D simulation mould filling reactive moulding

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Study of multipacting effect in sub-harmonic buncher of SSRF linac

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Chinese Physics C 2009年第S2期33卷 86-88页

作者：张猛赵明华汪宝亮 Shanghai Institute of Applied Physics CAS Graduate University of Chinese Academy of Sciences

during the design process, multipacting effect has been taken into consideration using a 2d simulation code MultiPac and all of the corners are rounded to suppress the multipacting effect in the pill-box cavity. However, unexpected multipacting effect prevents the increase of the input power when the magnetic field of focusing coils is added after adequate conditioning and a novel method is adopted to suppress it by introducing extra coils to counteract the field. This paper focuses on the simulation of multipacting effect in different magnetic field configurations. The experimental observations and simulation results of multipacting effect are presented and details of the multipacting process are also analyzed.

关键词： sub-harmonic buncher multipacting effect 3D simulation coil compensation method

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Research on the Texture-mapping of the Three-dimensional Urban Roadway simulation of Virtual Battlefield

Research on the Texture-mapping of the Three-dimensional Urb...

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2012年计算机应用与系统建模国际会议

作者： Hou Runfeng Chu Shili Li Chenhui Shi Lei Qi Genhua Air defense Forces Command Academy

Building virtual battlefield is an important subject in military simulation. In order to get realistic appearance in building roadway of battlefield by using 3D simulation technology, it’s natural to do some complex calculations for the surface of the roadway, involving patterns with certain colours and textures. Usually, the surface of roadway with single colour can be simulated by direct colouration. The surface involving complicated patterns with colours and textures need to use texture-mapping. In this paper, it’s demonstrated that, not only the complexity of the calculation for the surface can be simplified, but also the improvement of the efficiency and quality for the 3D simulation of the roadway can be achieved, by choosing proper texture pattern and appropriate texture mapping. Thereby, a satisfactory roadway constructed with 3D simulation technology appears.

关键词： Virtual battlefield 3D simulation Roadway Texture mapping

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