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Correspondence: Monopulse transmitarray antenna fed by aperture-coupled microstrip structure Correspondence
Na KOU, Shixing YU, Zhao DING, Zhengping ZHANG,nkou@gzu.edu.cn,sxyu1@gzu.edu.cn,zding@gzu.edu.cn,zpzhang@gzu.edu.cn
Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 3, Pages 502-510 doi: 10.1631/FITEE.2000547
Keywords： 孔径耦合；单脉冲天线；微带；透射阵列
Analysis on the Performance of Lightwave in the Large-core Optical Fiber Connector
Wang Yunming,Sun Xiaohan,Zhang Mingde
Strategic Study of CAE 2002, Volume 4, Issue 10, Pages 52-56
An analytical model for the large-core optical fiber connector is presented based on beam propagation method(BPM). In the case of the linear and nonlinear (including sinusoidal and cosine) vertical section of connector, affections of the coupling length and coupling angle for the connector on the insert loss and coupling efficiency are discussed when the beginning section and the ending section act as the input respectively. Optimum vertical section, length, and angle of the connector are obtained.
Keywords： beam propagation method (BPM) large-core optical fibers tapered connector insert loss
Near range millimeter wave synthetic aperture radiometer passive range measurement
Wang Benqing,Li Xingguo
Strategic Study of CAE 2010, Volume 12, Issue 3, Pages 95-99
The Particle Swarm Optimization (PSO) is an evolutionary computation, which not only can search solutions randomly and fully, but also is convenient to be carried out. Hence, the article focuses on the application of PSO to the multiple-objective coordination optimization of project, looking forward to seeking best solutions easily and quickly. After introducing the basic theory of the algorithms and its several versions, the article aims at the efficiency coefficient of quality, cost, time and resource subsystem, and set up a multiple optimization coordination model. In the following part, the article introduces how to apply PSO to solve the project coordination optimization problem in detail. The numeric example followed indicates that PSO can solve the multiple-objectives coordination optimization problem of project exactly and quickly.
Keywords： Particle Swarm Optimization (PSO) project management efficiency coefficient of coordination multiple optimization coordination model numeric example
Statistical Energy Analysis for Complicated Coupled System and Its Application in Engineering
Sheng Meiping
Strategic Study of CAE 2002, Volume 4, Issue 6, Pages 77-84
The new SEA method developed in this dissertation is the integration of virtues from the mobility analysis, classical SEA and classical theory of power flow, which fits for vibration and noise analysis of complicated coupled systems. This research provides a theoretical base for study on vibration transfer between structures and noise radiation of complicated mechanical systems, and it also offers guidance for isolation and noise control of engineering structures. Contributions of this dissertation are as follows： First, in view of the disunion of SEA parameters in classical SEA, a union definition of SEA parameters is brought forward. Secondly, some elements that influence energy transfer between mechanical structures are separated and corresponding parameters are introduced to investigate those influences separately. (1)Linking style coefficient is introduced to denote the rule of vibration energy transfer when structures are linked at one point, some points or a line. (2) Non-conservative coupling coefficient is introduced to describe the influence of isolation or damping when structures are isolated or damped. (3) Indirect coupling coefficient is introduced to research the property of vibration energy transfer when two structures are indirectly linked by other structure. Thirdly, on the basis of above, gradation analysis is put forward to simplify the vibration analysis of complicated coupled system. Then, by using theoretical achievements above, the property of vibration and noise radiation of underwater vehicle is analyzed by the developed SEA for the first time. Levels of vibration and sound power induced by two different underwater vehicles are predicted. The analysis results agree well with experiment results. Finally, based on the analysis, the direction of noise control of underwater vehicle is pointed out.
Keywords： power flow statistical energy analysis(SEA) mobility coupling
Differential coupling contributes to synchronization via a capacitor connection between chaotic circuits Regular Papers
Yu-meng XU, Zhao YAO, Aatef HOBINY, Jun MA
Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 4, Pages 571-583 doi: 10.1631/FITEE.1800499
Nonlinear oscillators and circuits can be coupled to reach synchronization and consensus. The occurrence of complete synchronization means that all oscillators can maintain the same amplitude and phase, and it is often detected between identical oscillators. However, phase synchronization means that the coupled oscillators just keep pace in oscillation even though the amplitude of each node could be different. For dimensionless dynamical systems and oscillators, the synchronization approach depends a great deal on the selection of coupling variable and type. For nonlinear circuits, a resistor is often used to bridge the connection between two or more circuits, so voltage coupling can be activated to generate feedback on the coupled circuits. In this paper, capacitor coupling is applied between two Pikovsk-Rabinovich (PR) circuits, and electric field coupling explains the potential mechanism for differential coupling. Then symmetric coupling and cross coupling are activated to detect synchronization stability, separately. It is found that resistor-based voltage coupling via a single variable can stabilize the synchronization, and the energy flow of the controller is decreased when synchronization is realized. Furthermore, by applying appropriate intensity for the coupling capacitor, synchronization is also reached and the energy flow across the coupling capacitor is helpful in regulating the dynamical behaviors of coupled circuits, which are supported by a continuous energy exchange between capacitors and the inductor. It is also confirmed that the realization of synchronization is dependent on the selection of a coupling channel. The approach and stability of complete synchronization depend on symmetric coupling, which is activated between the same variables. Cross coupling between different variables just triggers phase synchronization. The capacitor coupling can avoid energy consumption for the case with resistor coupling, and it can also enhance the energy exchange between two coupled circuits.
Keywords： Synchronization Voltage coupling Chaotic circuit Capacitor coupling
Won-Kyung Baek, Hyung-Sup Jung
Engineering 2020, Volume 6, Issue 8, Pages 927-935 doi: 10.1016/j.eng.2020.06.012
Conventional synthetic aperture radar (SAR) interferometry (InSAR) has been successfully used to precisely measure surface deformation in the line-of-sight (LOS) direction, while multiple-aperture SAR interferometry (MAI) has provided precise surface deformation in the along-track (AT) direction. Integration of the InSAR and MAI methods enables precise measurement of the two-dimensional (2D) deformation from an interferometric pair; recently, the integration of ascending and descending pairs has allowed the observation of precise three-dimensional (3D) deformation. Precise 3D deformation measurement has been applied to better understand geological events such as earthquakes and volcanic eruptions. The surface deformation related to the 2016 Kumamoto earthquake was large and complex near the fault line; hence, precise 3D deformation retrieval had not yet been attempted. The objectives of this study were to ① perform a feasibility test of precise 3D deformation retrieval in large and complex deformation areas through the integration of offset-based unwrapped and improved multiple-aperture SAR interferograms and ② observe the 3D deformation field related to the 2016 Kumamoto earthquake, even near the fault lines. Two ascending pairs and one descending the Advanced Land Observing Satellite-2 (ALOS-2) Phased Array-type L-band Synthetic Aperture Radar-2 (PALSAR-2) pair were used for the 3D deformation retrieval. Eleven in situ Global Positioning System (GPS) measurements were used to validate the 3D deformation measurement accuracy. The achieved accuracy was approximately 2.96, 3.75, and 2.86 cm in the east, north, and up directions, respectively. The results show the feasibility of precise 3D deformation measured through the integration of the improved methods, even in a case of large and complex deformation.
Keywords： Synthetic Aperture Radar (SAR) Conventional SAR interferometry (InSAR) Multiple-aperture SAR interferometry (MAI) ALOS2 PALSAR2 3D deformation retrieval 2016 Kumamoto earthquake
Multi-aperture optical imaging systems and their mathematical light field acquisition models Review Article
Qiming QI, Ruigang FU, Zhengzheng SHAO, Ping WANG, Hongqi FAN
Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 6, Pages 823-844 doi: 10.1631/FITEE.2100058
Inspired by the compound eyes of insects, many s have been proposed to improve the imaging quality, e.g., to yield a high-resolution image or an image with a large field-of-view. Previous research has reviewed existing s, but few papers emphasize the which is essential to bridge the gap between configuration design and application. In this paper, we review typical s (i.e., , , and ), and then summarize general mathematical s for different configurations. These mathematical models provide methods for calculating the key indexes of a specific , such as the field-of-view and sub-image overlap ratio. The mathematical tools simplify the quantitative design and evaluation of imaging systems for researchers.
Keywords： Multi-aperture optical imaging system Artificial compound eye Light field camera Camera array Light field acquisition model
Study on dynamics of coupled systems in high-speed trains
Zhang Weihua
Strategic Study of CAE 2015, Volume 17, Issue 4, Pages 42-52
According to the structure and technical features of high-speed railway， the high-speed train， rail line， air flow， power supply and catenary which are relevant to the high-speed train and have an effect on the dynamic behavior of the high-speed train are coupled as a unified system. The dynamic model of coupled systems in high-speed trains are created by establishing the dynamic models of high-speed train， rail line， pantograph-catenary and power supply and the coupled interaction models of wheel-rail， pantograph-catenary， liquid-solid and electro-mechanical. For the high speed train operation simulation requirements， this paper studied the train dynamics modeling and calculation method based on cyclic variable parameters method， the train-line coupled calculation method based on the slip model and the liquid-solid coupled calculation method based on the relaxation factor. the simulation of coupled systems in high-speed trains are realized. [Key words] high-speed train； service performance； train detection； tracking test； performance evolution
Keywords： high-speed train； service performance； train detection； tracking test； performance evolution
The Model of Water and Nitrogen Coupling in Winter Wheat Yield
Zhai Bingnian,Li Shengxiu
Strategic Study of CAE 2002, Volume 4, Issue 9, Pages 69-74
By using the quadratic general spinning design, pot experiments were conducted to study the comprehensive effect of the stage and rate of N fertilizer application under different status of soil moisture on winter wheat yield systematically. The results showed that the mathematical model established based on the result of experiments is significant. By analysing the mathematical model, the soil moisture, tillering and jointing stage were thought to be the remarkable factors, while the influencing sequence from large to small is： soil moisture ＞ tillering stage ＞ jointing stage ＞ milking stage ＞ seedling stage; The interaction effects exist between different factors.
Keywords： winter wheat nitrogen soil moisture water and nitrogen coupling mathematical model
A microstrip filter direct-coupled amplifier based on active coupling matrix synthesis Research Articles
Yang Gao, Fan Zhang, Yingying Qiao, Jiawei Zang, Lei Li, Xiaobang Shang,gaoyang678@outlook.com,lilei@zzu.edu.cn
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 9, Pages 1260-1269 doi: 10.1631/FITEE.2000292
Keywords： 放大器；滤波–放大器集成；微带线；耦合矩阵
Ting-ting JIN, Xiao-qiang SHE, Xiao-lan QIU, Bin LEI
Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 2, Pages 253-264 doi: 10.1631/FITEE.1700462
Classification of intertidal area in synthetic aperture radar (SAR) images is an important yet challenging issue when considering the complicatedly and dramatically changing features of tidal fluctuation. The difficulty of intertidal area classification is compounded because a high proportion of this area is frequently flooded by water, making statistical modeling methods with spatial contextual information often ineffective. Because polarimetric entropy and anisotropy play significant roles in characterizing intertidal areas, in this paper we propose a novel unsupervised contextual classification algorithm. The key point of the method is to combine the generalized extreme value (GEV) statistical model of the polarization features and the Markov random field (MRF) for contextual smoothing. A goodness-of-fit test is added to determine the significance of the components of the statistical model. The final classification results are obtained by effectively combining the results of polarimetric entropy and anisotropy. Experimental results of the polarimetric data obtained by the Chinese Gaofen-3 SAR satellite demonstrate the feasibility and superiority of the proposed classification algorithm.
Keywords： Intertidal classification Polarimetric synthetic aperture radar Finite mixture model Markov random field Generalized extreme value model
Coupled Thermo-Mechanical Simulation of Gear Preforming Based on Finite Deformation Theory
Ying Fuqiang,Pan Xiaoyong,Li Min
Strategic Study of CAE 2007, Volume 9, Issue 7, Pages 47-52
Gear preforming by cross wedge rolling is an original question for discussion, parameters such as deformation, temperature field and mechanical performance are looking forward to be researched. This paper ties the advantages of preforming by CWR and the principle of generated gear together, and the die suited for gear rolling has been designed. Based on the finite deformation theory, the coupled thermal-mechanical constitutive model of gear rolling by CWR has been established. Then FEM simulation for the forming process has been developed in MSC. SuperForm, and information gained from the simulation has been analyzed also in detail which provide references for further study of gear rolling by CWR technology.
Keywords： cross wedge rolling(CWR) gear coupled thermo-mechanical FEM
A Train-Bridge Dynamic Interaction Analysis Method and Its Experimental Validation
Nan Zhang, Yuan Tian, He Xia
Engineering 2016, Volume 2, Issue 4, Pages 528-536 doi: 10.1016/J.ENG.2016.04.012
The train-bridge dynamic interaction problem began with the development of railway technology, and requires an evaluation method for bridge design in order to ensure the safety and stability of the bridge and the running train. This problem is studied using theoretical analysis, numerical simulation, and experimental study. In the train-bridge dynamic interaction system proposed in this paper, the train vehicle model is established by the rigid-body dynamics method, the bridge model is established by the finite element method, and the wheel/rail vertical and lateral interaction are simulated by the corresponding assumption and the Kalker linear creep theory, respectively. Track irregularity, structure deformation, wind load, collision load, structural damage, foundation scouring, and earthquake action are regarded as the excitation for the system. The train-bridge dynamic interaction system is solved by inter-history iteration. A case study of the dynamic response of a CRH380BL high-speed train running through a standard-design bridge in China is discussed. The dynamic responses of the vehicle and of the bridge subsystems are obtained for speeds ranging from 200 km·h-1 to 400 km·h-1, and the vibration mechanism are analyzed.
Keywords： Train-bridge dynamic interaction Wheel/rail relationship Inter-history iteration Field measurement Experimental validation
Tian Zhiyong,Tu Xiang,Song Yonghui,Xin Wang,Li Fayun
Strategic Study of CAE 2013, Volume 15, Issue 3, Pages 80-87
The lab-scale and pilot-scale physical-chemical and biochemical combined technology tests were carried out for the treatment of refractory petrochemical dry-spun acrylic fiber wastewater in Liaohe River, in which the multi-compartment anoxic/oxic membrane bioreactor (A/O MBR) and multi-technology coordinated catalyzed ozone oxidation were used as core unit process. The results showed that the removal performance could be improved significantly by reasonable coupling of physical-chemical and biochemical technologies in the treatment of acrylic fiber wastewater, the COD, ammonium and total nitrogen removal efficiency in combined process of MBR, ozone oxidation and biological aerated filter(BAF) could reach 90 %, 95 % and 80 %, respectively, and their concentration of effluent were below 100 mg/L, 5 mg/L and 35 mg/L. In addition, due to the lack of biodegradable organic carbon source and the refractory of acrylonitrile oligomers and nitrogen-containing heterocyclic organic matter in dry-spun acrylic fiber wastewater, the ammoniation steps which converted organic nitrogen to inorganic ammonium had limited the total nitrogen removal effect of overall process.
Keywords： refractory dry-spun acrylic fiber wastewater physical-chemical biochemical combined treatment
Guo Hewei,Jiang Xinbiao,Zhao Zhumin,Chen Lixin,Zhang Xinyi,Zhou Yongmao
Strategic Study of CAE 2012, Volume 14, Issue 8, Pages 64-68
The paper set up the coupled calculation methods of criticality and burnup based on WIMS code and MCNP code, and validated the method. Through the calculation results of cells and the comparison of burnup experiments of Xi’an pulsed reactor, the validity and rationality of the coupled code were proved. The article utilized the coupled code to compute and analyze the burnup of in hospital neutron irradiator mark 1(IHNI-1) reactor at last.
Keywords： IHNI－1 reactor coupled code burnup
Title Author Date Type Operation
Correspondence: Monopulse transmitarray antenna fed by aperture-coupled microstrip structure
Na KOU, Shixing YU, Zhao DING, Zhengping ZHANG,nkou@gzu.edu.cn,sxyu1@gzu.edu.cn,zding@gzu.edu.cn,zpzhang@gzu.edu.cn
Journal Article
Analysis on the Performance of Lightwave in the Large-core Optical Fiber Connector
Wang Yunming,Sun Xiaohan,Zhang Mingde
Journal Article
Near range millimeter wave synthetic aperture radiometer passive range measurement
Wang Benqing,Li Xingguo
Journal Article
Statistical Energy Analysis for Complicated Coupled System and Its Application in Engineering
Sheng Meiping
Journal Article
Differential coupling contributes to synchronization via a capacitor connection between chaotic circuits
Yu-meng XU, Zhao YAO, Aatef HOBINY, Jun MA
Journal Article
Precise Three-Dimensional Deformation Retrieval in Large and Complex Deformation Areas via Integration of Offsets-Based Unwrapping and Improved Multiple-Aperture SAR Interferometry: Application to the 2016 Kumamoto Earthquake
Won-Kyung Baek, Hyung-Sup Jung
Journal Article
Multi-aperture optical imaging systems and their mathematical light field acquisition models
Qiming QI, Ruigang FU, Zhengzheng SHAO, Ping WANG, Hongqi FAN
Journal Article
The Model of Water and Nitrogen Coupling in Winter Wheat Yield
Zhai Bingnian,Li Shengxiu
Journal Article
A microstrip filter direct-coupled amplifier based on active coupling matrix synthesis
Yang Gao, Fan Zhang, Yingying Qiao, Jiawei Zang, Lei Li, Xiaobang Shang,gaoyang678@outlook.com,lilei@zzu.edu.cn
Journal Article
Intertidal area classification with generalized extreme value distribution and Markov random field in quad-polarimetric synthetic aperture radar imagery
Ting-ting JIN, Xiao-qiang SHE, Xiao-lan QIU, Bin LEI
Journal Article
Coupled Thermo-Mechanical Simulation of Gear Preforming Based on Finite Deformation Theory
Ying Fuqiang,Pan Xiaoyong,Li Min
Journal Article
A Train-Bridge Dynamic Interaction Analysis Method and Its Experimental Validation
Nan Zhang, Yuan Tian, He Xia
Journal Article
Research on physical-chemical and biochemical combined technology in the treatment of refractory petrochemical dry-spun acrylic fiber wastewater
Tian Zhiyong,Tu Xiang,Song Yonghui,Xin Wang,Li Fayun
Journal Article
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