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Secrecy outage performance for wireless-powered relaying systems with nonlinear energy harvesters Article
继亮 张,高峰 潘,宜原 解
Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 2, Pages 246-252 doi: 10.1631/FITEE.1601352
Si-Ping Gao, Jun-Hui Ou, Xiuyin Zhang, Yongxin Guo
Engineering 2023, Volume 30, Issue 11, Pages 32-48 doi: 10.1016/j.eng.2023.05.019
While sufficient review articles exist on inductive short-range wireless power transfer (WPT), long-haul microwave WPT (MWPT) for solar power satellites, and ambient microwave wireless energy harvesting (MWEH) in urban areas, few studies focus on the fundamental modeling and related design automation of receiver systems. This article reviews the development of MWPT and MWEH receivers, with a focus on rectenna design automation. A novel rectifier model capable of accurately modeling the rectification process under both high and low input power is presented. The model reveals the theoretical boundary of radio frequency-to-direct current (dc) power conversion efficiency and, most importantly, enables an automated system design. The automated rectenna design flow is sequential, with the minimal engagement of iterative optimization. It covers the design automation of every module (i.e., rectifiers, matching circuits, antennae, and dc–dc converters). Scaling-up of the technique to large rectenna arrays is also possible, where the challenges in array partitioning and power combining are briefly discussed. In addition, several cutting-edge rectenna techniques for MWPT and MWEH are reviewed, including the dynamic range extension technique, the harmonics-based retro-directive technique, and the simultaneous wireless information and power transfer technique, which can be good complements to the presented automated design methodology.
Keywords： Microwave wireless power transfer Microwave wireless energy harvesting Unified Rectifier model Automated rectenna design Emerging rectenna techniques
Eun-Jung YOON, Jong-Tae PARK, Chong-Gun YU
Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 2, Pages 285-296 doi: 10.1631/FITEE.1601181
Keywords： Thermoelectric energy Energy harvesting Maximum power point tracking (MPPT) control Self-powered system Sensor node
Xun Li, Baoyan Duan, Yiqun Zhang, Yongxin Guo
Engineering 2023, Volume 30, Issue 11, Pages 63-74 doi: 10.1016/j.eng.2023.07.016
This work presents an optimal design method of antenna aperture illumination for microwave power transmission with an annular collection area. The objective is to maximize the ratio of the power radiated on the annular collection area to the total transmitted power. By 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 forms. Based on the theory of matrices, the solution to the formulated optimization problem is to determine the largest characteristic value and its associated characteristic vector. To 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 problem. In 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 results. Finally, patch arrays are adopted to further verify the validity of the proposed method.
Keywords： Microwave power transmission Beam collection efficiency Ring-shaped beam Annular collection area Grey wolf optimizer Nelder–Mead simplex method
Zhuang Huiyong,Zhang Yanru,Tian Yalin,Wang Gehua
Strategic Study of CAE 2011, Volume 13, Issue 2, Pages 101-106
Based on existing biomass resources industrial application research in biomass power generation projects, the theoretical and practical experience were summarized. And the technology choice, model construction and system perfection were analyzed in order to achieve the goal of constructing and perfecting China agricultural and forestry biomass industrial collection application model.
Keywords： biomass industrial collection model
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
On Advanced Control Methods toward Power Capture and Load Mitigation in Wind Turbines
Yuan Yuan,Jiong Tang
Engineering 2017, Volume 3, Issue 4, Pages 494-503 doi: 10.1016/J.ENG.2017.04.023
This article provides a survey of recently emerged methods for wind turbine control. Multivariate control approaches to the optimization of power capture and the reduction of loads in components under time-varying turbulent wind fields have been under extensive investigation in recent years. We divide the related research activities into three categories: modeling and dynamics of wind turbines, active control of wind turbines, and passive control of wind turbines. Regarding turbine dynamics, we discuss the physical fundamentals and present the aeroelastic analysis tools. Regarding active control, we review pitch control, torque control, and yaw control strategies encompassing mathematical formulations as well as their applications toward different objectives. Our survey mostly focuses on blade pitch control, which is considered one of the key elements in facilitating load reduction while maintaining power capture performance. Regarding passive control, we review techniques such as tuned mass dampers, smart rotors, and microtabs. Possible future directions are suggested.
Keywords： Wind turbine Control approach Power optimization Load mitigation
A Breakthrough in Solving the Problem of Train Derailment —The Approach of Random Energy Analysis
Zeng Qingyuan,Xiang Jun,Lou Ping
Strategic Study of CAE 2002, Volume 4, Issue 12, Pages 9-20
The present studies at home and abroad of train derailment are summarized. The following main problems in derailment research are analyzed: train derailment can not be prevented by the normal standards mapped out by each country; the main problems are not grasped; three fundamental problems — the sole solution to the vibration equation group of train-track (or train-bridge) time-varying system is not guaranteed; the excitation source of lateral vibration of the system is not clear; the problem of random analysis of this system is not solved — still exist in calculation theory of train derailment. The approach of random energy analysis, the breakthrough in solving the problem of train derailment, is presented. Preventive measures of train derailment and the calculation method of safety coefficient against derailment are introduced. Finally, four actual instances of train derailment are calculated and the results are in conformity with the actual accidents of derailment and with car vibrations tested by derailment experiments.
Keywords： train derailment approach of random energy analysis energy increment criterion preventive measures of derailment safety coefficient against derailment
A comprehensive review of optical wireless power transfer technology Review
Syed Agha Hassnain MOHSAN, Haoze QIAN, Hussain AMJAD,Hassnainagha@zju.edu.cn
Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 6, Pages 767-800 doi: 10.1631/FITEE.2100443
Keywords： Wireless power transmission Optical wireless power transfer Distributed laser charging Laser diode Solar cell
Phase synchronization and energy balance between neurons Research Article
Ying XIE, Zhao YAO, Jun MA
Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 9, Pages 1407-1420 doi: 10.1631/FITEE.2100563
Keywords： Hamilton energy Coupling synchronization Synapse enhancement Neural circuit
Exploration for the Synthesis Route of Superior High Energy Density Materials (SHEDM)
Yu Yongzhong
Strategic Study of CAE 1999, Volume 1, Issue 2, Pages 91-94
The development of high explosives could be reviewed as TNT, RDX, and HMX as three historical stages, and now we are coming in the fourth stage which marked by the appearance of CL-20. However, the increment of energy denicty of the CL-20 is only about 10% greater than that of HMX.
For the needs of the improvement of the weapon systems in the next century, it is necessary to search and develop the superior high energy density materials, and it would be some quite new classes of substance.
Performance of nitrogen cluster, such as octaazacubane N8, was calculated by quantum chemists and demonstrated its remarkable prospects, which is represented as an example of the imaginary SHEDM. And it was emphasized that new allotropic forms of nitrogen Nn would be the most promissing substance as SHEDM. Recently N5+ was found in the MS, and it is already prepared as a salt by Christe.
Nitrogen polymer Nn, in which n is a large number and N atoms are connected by covalent bonds in a three dimentioal net structure just as a polymer, is should be paid the greatest attention and would become the most powerful SHEMD in the next century.
Keywords： HEDM nitrogen cluster nitrogen polymer
Self-Powered Active Vibration Control: Concept, Modeling, and Testing Article
Jin-Yang Li, Songye Zhu
Engineering 2022, Volume 11, Issue 4, Pages 126-137 doi: 10.1016/j.eng.2021.03.022
Despite their superior control performance, active vibration control techniques cannot be widely used in some engineering fields because of their substantial power demand in controlling large-scale structures. As an innovative solution to this problem, an unprecedented self-powered active vibration control system was established in this study. The topological design, working mechanism, and power flow of the proposed system are presented herein. The self-powering ability of the system was confirmed based on a detailed power flow analysis of vibration control processes. A self-powered actively controlled actuator was designed and applied to a scaled active vibration isolation table. The feasibility and effectiveness of the innovative system were successfully validated through a series of analytical, numerical, and experimental investigations. The setup and control strategy of the proposed system can be readily extended to diversified active vibration control applications in various engineering fields.
Keywords： Self-powered active vibration control Energy harvesting Skyhook control Power equilibrium Smart control
Zhou Fengjun
Strategic Study of CAE 2000, Volume 2, Issue 12, Pages 45-51
Based on results of radiate-hydrodynamic and TNT charge hydrodynamic blast wave calculations, the physical characteristic in close- in and distance regions of two kinds of explosions and the development of different blast wave systems are studied. Some important conclusions for protection engineering are obtained. Also, flood wave disasters due to two kind explosions are discussed and great meaning of protection engineering for flood wave are described.
Keywords： high energy density explosion chemical explosion shock wave flood wave
Remarks on Distributed Energy System
Song Zhiping
Strategic Study of CAE 2004, Volume 6, Issue 12, Pages 78-84
The emergence of distributed energy system is a matter of great significance relating to implementation of sustainable strategy. As proposed by the author, distributed energy system(DES)is defined as an electric power total system compatible with environment, sited in or in the vicinity of the consumer center area without bulk and/or remote power transmission. The DES concept allows people to build and operate energy system on total energy basis and thus facilitates demand side management as well as a more intelligent use of energy. It is considered essential for fossil fueled DES that energy is utilized in a cascade way matching the energy quality supplied and needed. DES also opens the most effective way of implementation of Combined Heat & Power as well as multi-generation. While the preferable choice of primary energy might be the clean fuel such as natural gas, but from the long-term point of view, the clean coal technology should not be excluded from the DES category. Although there is a great deal of interest in micro-turbines at the moment, combustion engines still have their tremendous potential for DES application.
Keywords： distributed energy system sustainable strategy Combined Heat & Power multi-generation
Analysis for freshwater supply mode in situ of remote islands
Jiang Haibo,Zhao Yunpeng and Cheng Zhongqing
Strategic Study of CAE 2014, Volume 16, Issue 3, Pages 99-102
This paper analyzed the main problems of remote islands on long- distance water supply from the mainland by shipping in typhoon-prone environment. The freshwater protection mode of self-sufficiency in situ was proposed. The features，complementarities，specific methods and technical means of water supply problems in situ of remote islands and reefs by two methods of rainwater harvesting and desalination by renewable energy power generation system were discussed. Research shows that the two specific fresh water supply modes of“the underground shallow lake rainwater harvesting system in coral sand beach”and“the reverse osmosis desalination systems powered directly by photovoltaic energy”have complementary and a high development potential，which are suitable for application in remote islands.
Keywords： rainwater harvesting photovoltaic power generation sea water desalination remote islands freshwater protection
Title Author Date Type Operation
Secrecy outage performance for wireless-powered relaying systems with nonlinear energy harvesters
继亮 张,高峰 潘,宜原 解
Journal Article
Scavenging Microwave Wireless Power: A Unified Model, Rectenna Design Automation, and Cutting-Edge Techniques
Si-Ping Gao, Jun-Hui Ou, Xiuyin Zhang, Yongxin Guo
Journal Article
Thermal energy harvesting circuit with maximum power point tracking control for self-powered sensor node applications
Eun-Jung YOON, Jong-Tae PARK, Chong-Gun YU
Journal Article
Optimal Design of Aperture Illuminations for Microwave Power Transmission with Annular Collection Areas
Xun Li, Baoyan Duan, Yiqun Zhang, Yongxin Guo
Journal Article
Research and experience on industrial collection and application model for agricultural and forestry biomass in China
Zhuang Huiyong,Zhang Yanru,Tian Yalin,Wang Gehua
Journal Article
Statistical Energy Analysis for Complicated Coupled System and Its Application in Engineering
Sheng Meiping
Journal Article
On Advanced Control Methods toward Power Capture and Load Mitigation in Wind Turbines
Yuan Yuan,Jiong Tang
Journal Article
A Breakthrough in Solving the Problem of Train Derailment —The Approach of Random Energy Analysis
Zeng Qingyuan,Xiang Jun,Lou Ping
Journal Article
A comprehensive review of optical wireless power transfer technology
Syed Agha Hassnain MOHSAN, Haoze QIAN, Hussain AMJAD,Hassnainagha@zju.edu.cn
Journal Article
Exploration for the Synthesis Route of Superior High Energy Density Materials (SHEDM)
Yu Yongzhong
Journal Article
Self-Powered Active Vibration Control: Concept, Modeling, and Testing
Jin-Yang Li, Songye Zhu
Journal Article
The Physical Characteristic of the High Energy Density and the Chemical Explosions and Discussion on the Effects of Flood Wave Due to Explosions
Zhou Fengjun
Journal Article
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