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Design and experiment of a hydraulic lifting wind field test platform for crop protection UAS

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International Journal of Agricultural and Biological Engineering 2021年第4期14卷 166-174页

作者： Songchao Zhang Wei Gu Baijing Qiu Xinyu Xue Lixin Zhou Key Laboratory of Modern Agricultural Equipment and Technology Ministry of EducationJiangsu UniversityZhenjiang 212013JiangsuChina Key Laboratory of Plant Protection Engineering Ministry of Agriculture and Rural AffairsZhenjiang 212013JiangsuChina Nanjing Institutes of Agricultural Mechanization Ministry of Agriculture and Rural AffairsNanjing 210014China

As a new type of crop protection machine,the crop protection unmanned aerial system(CPUAS)is developing rapidly in *** wind field generated by the rotor has a great influence on the deposition and penetration of spraying *** purpose of this study was to develop a reliable and stable test platform that could be used for wind field test of CPUAS,and to carry out the downwash experiments on the platform to obtain the downwash distribution law of a CPUAS Z-3N(100 kg level,Nanjing Research Institute on Simulation Technique,Nanjing,China).The tests showed that the performances of the developed platform could meet the expected design *** platform operated stably and reliably during the downwash experiments of Z-3N,which indicated it could be applied for CPUASs of 100 kg level and *** vibration characteristics of the platform with different heights(2.0 m,3.0 m,5.0 m,7.0 m,10.0 m)were obtained through modal analysis,which could effectively guide avoiding the resonance for stable and reliable operation during the experiments with the tested CPUAS Z-3N.A ring-radial method was designed combined with the platform for the downwash *** experimental results showed that the downwash distribution of Z-3N was not symmetrical;the downwash wind speed decreased with the increase of the radial distance while the changing trend was not consistent as the height ***,the area with high wind speed was mainly within 3.0 m of the radial distance,and the maximum value was 11.37 m/*** study provided a new way for wind field test of CPUASs and would provide some references for better utilization of wind field during the CPUAS spraying.

关键词： crop protection unmanned aircraft system wind field test platform vibration modal aerial spraying

Designing and Implementing A Marine Propeller test platform

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Designing and Implementing A Marine Propeller Test Platform

作者： Elias Taalab 杭州电子科技大学

学位级别：硕士

Marine propellers are essential components of many watercrafts,and their performance depends on various factors such as geometry,material,speed,and pitch ***,in this study,we demonstrate the main elements and working principle of a marine *** also explain the main principle of lift and drag force and its effects on propeller's design and ***,we demonstrated how a propeller can be tested in realistic *** studying previous designs and patents of marine propeller test platforms,some limitations have been found and *** address these limitations,the main objective of this study has been set to develop a propeller test platform that can measure the thrust and torque of different propellers with high accuracy and *** setting the suitable requirements and designing the propeller test platform,we propose a new design of a marine propeller test platform that uses a swing arm mechanism to fix the propeller under water and sense its thrust force while keeping the main motor and the frame *** design allows us to get high sensitivity measurements continuously and precisely without being affected by the motor and frame *** the mentioned design,a well-balanced mechanism has been achieved with high sensitivity thrust measuring *** platform could sense small forces of about 0.001 kgf,which is essential for evaluating the performance of low-thrust ***,we achieved a power train that can deliver up to 22 k W of power to the propeller with up to 1500 rpm of rotational speed suitable for most mid-sized propellers,and that with torque consumption up to 70 N·m which allows us to test a wide range of propellers with different power and speed *** to the previously used platform,this new design can be up to 120 times faster than old test platforms when it comes to changing *** achieved propeller test platform can hold up to 2500 N of thrust force an

关键词： Marine Propeller test Rig test platform Propeller Coefficients

Scheme of Railway 5G Integrated Innovation test platform

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Chinese Railways 2023年第1期 62-70页

作者： CHAI Jinchuan ZHENG Mingda National Railway Track test Center China Academy of Railway Sciences Corporation Limited 不详

An inevitable trend has already taken shape for the application of the 5th Generation Mobile Communication Technology(5G)in the railway *** application scenarios and business types of the railway sector are complex and diverse,so it is indispensable to test and verify the railway 5G before actual *** design and creation of the railway 5G integrated innovation test platform provides engineering design,test and verification conditions for the networking,coverage and business development of 5G public networks and 5G-R in railway *** paper introduces the design of the overall architecture for the integrated railway 5G innovation test platform according to the railway network requirements,application scenarios and intelligent development trend;respectively elaborates on the design of the 5G-R core network,bearer network and wireless access along loop tracks,in combination with the characteristics of railway scenarios and the requirements of railway dispatching,operation and safety;raises further solutions on the network deployment and coverage schemes of 5G public networks so as to meet the application requirements of 5G public *** study results show that the integrated railway 5G innovation test platform scheme contains co-existence of 5G public and private networks,combines the indoor and outdoor scenarios,as well as takes into account of the dynamic and static tests so as to meet the environmental requirements for the integrated railway 5G test and application of all network functions,for which it can provide comprehensive technical support for railway 5G technology research and development,standard formulation,testing,etc.

关键词： railway communication 5G public network 5G-R integrated innovation test platform

Development of a WAMS based test platform for power system real time transient stability detection and control

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Protection and Control of Modern Power Systems 2016年第1期1卷 37-47页

作者： Jinquan Zhao Yujie Zhang Pan Zhang Xiaoming Jin Chao Fu College of Energy&Electrical Engineering Hohai UniversityNanjingChina Electric Power Research Institute CSGGuangzhouChina.

The real-time transient stability detection and emergency control technology based on wide area response has become a hot research area in power system stability *** different technologies have been proposed,but lots of problems remain to be solved before they can be applied in practice.A wide area measurement system(WAMS)based test platform is developed for transient stability detection and *** design as well as main function modules of the platform are *** addition,three generator power angle prediction methods and six response based transient instability detection technologies are *** of engineering application demonstrate that the developed test platform can provide a real-time operation environment,which can effectively compare and analyze the validity and practicability of these transient stability detection *** on the measured perturbed trajectories from actual power systems or the Real-Time Digital Simulators(RTDS),the platform can realize the assessment and visual result presentation of various responses from different transient instability detection *** test platform can be applied to different power systems and it is convenient to embed new transient instability detection *** some deficiencies and shortcomings in engineering application are pointed out and corresponding suggestions are *** conclusion,the hardware and software structure,function modulus and engineering applications are *** application in actual power systems shows that it has a good application perspective.

关键词： test platform Transient instability detection and control PMU WAMS

An In-vehicle Inertia test platform for Dynamics Control System

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An In-vehicle Inertia Test Platform for Dynamics Control Sys...

Novel control strategy for the energy recovery system of a hydraulic excavator

2010 International Conference on Computer,Mechatronics, Control and Electronic Engineering (CMCE 2010)

作者： Pan Shenghui 1 2 1 School of Mechanical and Automobile Engineering Hefei University of Technology Hefei,China Wang Qidong 1,Jiang Wuhua 1 2 Dept.of Electric Information and Control Engineering Guangxi University of Technology Liuzhou,China

To support vehicle dynamics controller development,verification and evaluation,an independent practical in-vehicle inertia test platform(ITP) has been developed to measurement and monitor vehicle dynamics *** this paper,the basic principle of the proposed inertial measurement unit is explained,the system architecture of the ITP is proposed,as well as the main functionality of software is *** a typical test result,an antilock brake system (ABS) performance assessment is provided to illustrate that a fast and accurate measurement of the vehicle longitudinal acceleration,lateral acceleration,yaw rate and roll rate can be obtained with a proposed test scheme.

关键词： inertial measurement unit test platform dynamics control system vehicle dynamics states

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International Journal of Agricultural and Biological Engineering 2024年第2期17卷 94-101页

作者： Changsheng Liu Qinghua He Qijun Tang Kai Ren Jun Gong Daqing Zhang The National Enterprise Research and Development Center Sunward Intelligence Equipment Co.Ltd.Changsha 410131China College of Mechanical and Electrical Engineering Hunan Agricultural UniversityChangsha 410128China College of Eletronical and Information Engineering Hunan UniversityChangsha 410082China

The energy saving of hydraulic excavators is always an essential *** energy recovery system can effectively recover the boom potential energy and rotational kinetic *** on the standard working cycle of hydraulic excavators,a dynamic programming(DP)control strategy for hybrid hydraulic excavators was proposed to recover the boom potential energy and rotational kinetic *** hybrid hydraulic excavator simulation model was built by Simulink *** simulation results indicated that the fuel consumption of hybrid hydraulic excavators using the DP control strategy was about 21.3%lower than that of the conventional hydraulic *** order to experimentally verify the simulation results,an experimental platform for hybrid hydraulic excavators was *** experimental results indicated that the fuel consumption of hybrid hydraulic excavators using the DP control strategy was about 18.9%lower than that of the conventional hydraulic *** paper shows that the DP control strategy applied to hybrid hydraulic excavators can recycle the boom potential energy and rotational kinetic energy,and reduce the fuel consumption of hybrid hydraulic excavators.

关键词： hybrid excavator energy recovery control strategy simulation analysis test platform

Solution of Software test of Computerized Numerical Control (CNC) Systems

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Solution of Software Test of Computerized Numerical Control ...

Parameter Selection and Performance Analysis of Mobile Terminal Models Based on Unity3D

The 2011 International Conference on Mechanical Materials and Manufacturing Engineering(ICMMME 2011)

作者： Wang Yichen Wang Yikun Institute of reliability and system engineering Beihang University Beijing Sirius Inc

Software has been used more and more widely in CNC systems, the defects caused by software among all defects of a CNC device have been higher and higher as well. How to diagnose the defects caused by software in CNC device fast and effectively is the topic of this paper. This paper talks about the features of embedded software first, and then introduces a proved method used in software test and defect diagnosis by using software system test platform. We'll use an instance to elaborate on it. We'll make a general summary of this method at the end of the paper.

关键词： computerized numerical control system software test test platform

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Computer Aided Drafting,Design and Manufacturing 2014年第3期24卷 57-64页

作者： KONG Li-feng ZHAO Hai-ying XU Guang-mei Mobile Media and Cultural Calculation Key Laboratory of Beijing Century College BUPT Information College of Beijing Union University

Mobile platform is now widely seen as a promising multimedia service with a favorable user group and market prospect. To study the influence of mobile terminal models on the quality of scene roaming, a parameter setting platform of mobile terminal models is established to select the parameter selection and performance index on different mobile platforms in this paper. This test platform is established based on model optimality principle, analyzing the performance curve of mobile terminals in different scene models and then deducing the external parameter of model establishment. Simulation results prove that the established test platform is able to analyze the parameter and performance matching list of a mobile terminal model.

关键词： mobile terminal models model parameter model optimality test platform

Implementation of Space Vector Modulated Direct Torque Controll for Electric Vehicle Dynamic Emulation

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Implementation of Space Vector Modulated Direct Torque Contr...