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Coupling Modeling for Functional Surface of Electronic Equipment

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Chinese Journal of Mechanical Engineering 2017年第3期30卷 497-499页

作者： baoyan duan Congsi WANG Wei WANG key laboratory of electronic equipment structure design of ministry of education xidian universityXi'an 710071China

High performance electromechanical equipment is widely used in various fields, such as national defense, industry and so on [ 1]. In addition, the technical level of high performance electromechanical equipment is the... 详细信息

关键词： TT Coupling Modeling for Functional Surface of Electronic Equipment

Influence and experiment of cable-net manufacturing errors on surface accuracy of mesh reflector antennas

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Chinese Journal of Aeronautics 2023年第2期36卷 363-376页

作者： Zihan SUN baoyan duan Yiqun Zhang Dongwu YANG School of Electromechanical Engineering Xidian UniversityXi'an 710071China

Cable-net structures are of substantial importance in the construction of large mesh reflector *** to the inevitable errors in their manufacturing process,the reflector surface accuracy *** study makes a comprehensive investigation of random manufacturing errors during constructing the mesh reflector antennas,and analyze its influence on reflector surface ***,the sensitivity of reflector surface accuracy with respect to the random errors of the unstressed cable length is mathematically ***,a non-button connecting method is proposed and analyzed to reduce manufacturing ***,two physical experiment models based on 2.62-meter mesh reflector antenna are ***,numerical examples and experimental tests are given to demonstrate the effectiveness of the proposed *** with the traditional method,the proposed method can effectively reduce the influence of the manufacturing errors on the reflector surface ***,the reduction in the sizes of the nodes also reduces the risk of entanglement of the mesh reflector antenna during the deployment process,and thereby improves the deployment reliability.

关键词： Error analysis Experimental tests Manufacturing methods Reflector antenna Surface accuracy

Optimal Design of Aperture Illuminations for Microwave Power Transmission with Annular Collection Areas

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Engineering 2023年第11期30卷 63-74页

作者： Xun Li baoyan duan Yiqun Zhang Yongxin Guo Shaanxi Key Laboratory of Space Solar Power Station System Xidian UniversityXi’an 710071China Department of Electrical and Computer Engineering National University of SingaporeSingapore 117576Singapore

This work presents an optimal design method of antenna aperture illumination for microwave power transmission with an annular collection *** objective is to maximize the ratio of the power radiated on the annular collection area to the total transmitted *** formulating the aperture amplitude distribution through a summation of a special set of series,the optimal design problem can be reduced to finding the maximum ratio of two real quadratic *** on the theory of matrices,the solution to the formulated optimization problem is to determine the largest characteristic value and its associated characteristic *** meet security requirements,the peak radiation levels outside the receiving area are considered to be extra constraints.A hybrid grey wolf optimizer and Nelder–Mead simplex method is developed to deal with this constrained optimization *** order to demonstrate the effectiveness of the proposed method,numerical experiments on continuous apertures are conducted;then,discrete arrays of isotropic elements are employed to validate the correctness of the optimized ***,patch arrays are adopted to further verify the validity of the proposed method.

关键词： Microwave power transmission Beam collection efficiency Ring-shaped beam Annular collection area Grey wolf optimizer Nelder-Mead simplex method

Structural design and model fabrication of cable-rib tensioned deployable parabolic cylindrical antenna

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Chinese Journal of Aeronautics 2023年第8期36卷 229-246页

作者： Shunji ZHANG baoyan duan Shuxin ZHANG Nan WANG Shaanxi Key Laboratory of Space Solar Power Station System Xi’an 710071China School of Electromechanical Engineering Xidian UniversityXi’an 710071China Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100101 China

Deployable mechanisms with light weight and high storage ratio have received considerable attention for space applications. To meet the requirements of space missions, a parabolic cylindrical deployable antenna based on cable-rib tension structures is proposed and verified by a physical prototype. The parabolic cylindrical antenna adopts simple parallel four-bar mechanisms to construct the basic deployable unit, and the cylindrical direction dimension can be easily extended by modularization, which has obvious advantages in storage ratio and area density. Considering the complexity of the entire antenna structure design, including cable networks and flexible trusses, the form-finding design optimization model of a parabolic cylindrical antenna is established using the force density sensitivity method, and then the kinematics analysis of the deployable mechanism is carried out. Finally, a single-module prototype with a deployable diameter of 4 m × 2 m was designed and fabricated. The results of the ground deployment process test and surface accuracy measurements show that the antenna has good feasibility and practicability.

关键词： Form-finding design Kinematic analysis Mechanism design Paraboliccylindrical antenna Principle prototype

Advanced Antennas Push Forward Wireless Connectivity

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Engineering 2022年第4期8卷 1-2页

作者： Kwai Man Luk baoyan duan the Royal Academy of Engineering the Chinese Academy of Engineering

Antennas are critical components for wireless *** general,antennas with a wide bandwidth,compact size,and high efficiency are required in order to achieve a high level of system performance with modern wireless communication systems,sensor networks,radio astronomy,deep space probes,and so *** importance of antennas is reflected by the numerous research articles that have been published on this topic in recent years—not only in antenna journals,but also in other related journals on sensors,vehicular technologies,microwave techniques,and terahertz *** huge number of downloads for the papers published in major antenna journals also demonstrates the attractiveness of antenna research.

关键词： antenna Antennas Push

A Reverse-Design Strategy for the Track Error of the Qi Tai Telescope Based on Pointing Accuracy

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Engineering 2022年第6期8卷 209-216页

作者： Na Li baoyan duan Xiangyang Li Bin Zheng Jiang Wu Key Laboratory of Electronic Equipment Structure Design Ministry of EducationXidian UniversityXi’an 710061China

The Qi Tai Telescope(QTT),which has a 110 m aperture,is planned to be the largest scale steerable tele-scope in the ***,the telescope’s repeated pointing accuracy error should be less than 2.5 arc seconds(arcsec);thus,the telescope structure must satisfy ultra-high precision *** this pur-suit,the present research envisages a reverse-design method for the track surface to reduce the difficulty of the telescope’s design and ***,the distribution characteristics of the test data for the track error were verified using the skewness coefficient and kurtosis coefficient *** to the distribution characteristics,the azimuth track error was simulated by a two-scale *** error of the long period and short amplitude was characterized as large-scale and described by a trigonometric function,while the short period and high amplitude error was characterized as small-scale and simulated by a fractal *** on the two-scale model,effect of the error on the pointing accuracy was ***,the relationship between the root mean square(RMS)of the track error and the RMS of the pointing accuracy error of the telescope was ***,the allowable RMS value of the track error was derived from the allowable pointing accuracy *** validate the effectiveness of the new design method,two typical radio telescopes(the Green Bank Telescope(GBT)and the Large Millimeter Telescope(LMT))were selected as experimental *** comparison,the theoretical calculated values of the pointing accuracy of the telescope were consistent with the measured values,with a maximum error of less than 10%.

关键词： Reverse design Track error Large radio telescope Two-scale model Pointing accuracy

Effect of operational condition of rotational subsystem on attitude control for space solar power station

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Chinese Journal of Aeronautics 2021年第5期34卷 289-297页

作者： Xiangfei JI baoyan duan Yiqun ZHANG Guanheng FAN Meng LI Yang YANG Shaanxi Key Laboratory of Space Solar Power Station System Xidian UniversityXi'an 710071China Key Laboratory of Electronic Equipment Structure Design Ministry of Education Xidian UniversityXi'an 710071China Qian Xuesen Laboratory of Space Technology China Academy of Space TechnologyBeijing 100094China School of Chemical Engineering Northwest UniversityXi'an 710071China

Space Solar Power Station(SSPS)is a giant spacecraft to collect space solar energy and transmit electric energy to the ground by using the wireless transmission *** a concentrated space solar power station,SSPS via the Orb-shape Membrane Energy Gathering Array(OMEGA)system is comprised of the concentrator subsystem,the photovoltaic array subsystem and the transmitting antenna *** this manuscript,the comprehensive study on the coordinate kinematic among subsystems is carried ***,kinematic analysis and dynamic analysis are ***,under the condition of ideal attitude,the influence of the moving condition of the Photovoltaic(PV)array on the overall system is ***,the control ability for the deviation attitude caused by the acceleration process of the photovoltaic array is *** simulation results demonstrate the serious influence of the angular acceleration of the photovoltaic array on the system’s attitude and the validity of the designed attitude control system.

关键词： Space solar power station SSPS-OMEGA Kinematic analysis Dynamic analysis Attitude control system

Inverse kinematics model of parallel macro-micro manipulator system

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Chinese Science Bulletin 2000年第24期45卷 2221-2226页

作者： WANG Wenli duan baoyan LIU Hong NAN Rendong PENG Bo School of Mechanical and Electronic Engineering Xidian UniversityXi’an 710071China Beijing Astronomy Observatory China Academy of SciencesBeijing 100012China

An improved design, which employs the integration of optic, mechanical and electronic technologies for the next generation large radio telescope, is presented in this note. The authors propose the concept of parallel macro-micro manipulator system from the feed support structure with a rough tuning subsystem based on a cable structure and a fine tuning subsystem based on the Stewart platform. According to the requirement of astronomical observation, the inverse kinematics model of this parallel macro-micro manipulator system is deduced. This inverse kinematics model is necessary for the computer-controlled motion of feed.

关键词： large radio telescope parallel manipulator kinematics.

On the Innovation,Design,Construction,and Experiments of OMEGA-Based SSPS Prototype:The Sun-Chasing Project

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Engineering 2024年第5期36卷 90-101页

作者： baoyan duan Yiqun Zhang Guangda Chen Ze Zhao Jianwei Mi Xun Li Lin Yang Xi Li Research Institute on Mechatronics Xidian UniversityXi’an 710071China Research Institute of Antenna Xidian UniversityXi’an 710071China

This study systematically introduces the development of the world’s first full-link and full-system ground demonstration and verification system for the OMEGA space solar power satellite(SSPS).First,the OMEGA 2.0 innovation design was ***,field-coupling theoretical models of sunlight concentration,photoelectric conversion,and transmitting antennas were established,and a systematic optimization design method was ***,a beam waveform optimization methodology considering both a high beam collection efficiency and a circular stepped beam shape was ***,a control strategy was developed to control the condenser pointing toward the sun while maintaining the transmitting antenna toward the ***,a high-efficiency heat radiator design method based on bionics and topology optimization was ***,a method for improving the rectenna array’s reception,rectification,and direct current(DC)power synthesis efficiencies is ***,high-precision measurement technology for high-accuracy beam-pointing control was ***,a smart mechanical structure was designed and ***,the developed SSPS ground demonstration and verification system has the capacity for sun tracking,a high concentration ratio,photoelectric conversion,microwave conversion and emission,microwave reception,and rectification,and thus satisfactory results were obtained.

关键词： OMEGA-SSPS Full-link and full-system Beam collection efficiency Circular stepped beam shape Smart structure Field coupling theoretical model `Beam pointing control