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A mechanical reliability study of 3-dB waveguide hybrid couplers in submillimeter and terahertz bands Research Articles
Zhongqian Niu, Bo Zhang, Daotong Li, Dongfeng Ji, Yang Liu, Yinian Feng, Tianchi Zhou, Yaohui Zhang, Yong Fan,zhangbouestc@yeah.net
Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 8, Pages 1104-1113 doi: 10.1631/FITEE.2000229
Keywords： 定向耦合器；3-dB分支波导定向耦合器；亚毫米波器件；太赫兹电路；机械可靠性
Research on Direction and Location for Danger Prediction of Coal or Rock Dynamic Disaster
Xiao Hohgfei,He Xueqiu,Feng Tao,Wang Enyuan
Strategic Study of CAE 2005, Volume 7, Issue 11, Pages 81-86
In order to use the non-touch electromagnetic emission (EME) method to better forecast or predict the danger of coal or rock dynamic disaster such as coal or gas outburst, rock or coal outburst and so on, the direction and location of dangerous areas, that is, how to ascertain the monitoring direction and position for EME, is studied. The research results show that according to the computation for the changing rules of EME signals in various directions by means of the coupling equation between EME and stress, and the EME numerical results comparisons for the designated monitored spot, the best monitoring direction and the direction with most stress or maximum dangers can be ascertained. When dynamically monitoring the EME signals in tunnel head-on in the course of tunnel excavation, the monitoring antenna should be laid at the middle height of tunnel and faced with the coal stratum direction. The outburst danger can be monitored by altering the antenna monitoring direction. The available scope of prediction distance can be determined in light of the stress concentration ascertained by numerical simulation for stress field. The EME measuring results on the spot show that it is feasible to study the direction and location of dangerous areas in predicting the danger of coal or rock dynamic disaster by means of the coupling between EME and stress.
Keywords： rock or coal dynamic disaster danger prediction direction and location deformation and fracture of coal or rock couples between EME and stress electromagnetic emission (EME)
High Sensitive Electron-Bombarded CCD for Low Light Level Imaging
Zhou Liwei,Liu Guangrong,Gao Zhiyun,Wang Zhongchun
Strategic Study of CAE 1999, Volume 1, Issue 3, Pages 56-62
The present paper reviews the recent developments of electron-bombarded charge coupled devices (EBCCD) for low-light-level imaging. The EBCCD eliminates the complicated image transfer chain associated with conventional image intensifier fibrecoupled CCD (ICCD) by integrating a thinned back-illuminated CCD directly into the vacuum of the image tube in replacement of the phosphor screen. The photoelectrons emitted from the photocathode are “proximity focusing” or “sharp focusing” directly onto the electron sensitive CCD, and the video-signal occurs. It has been shown that the EBCCD image tubes offer nearly noiseless gain, high signal to noise ratio and excellent MTF and, for this reason, are superior to conventional ICCD approaches under all light level conditions. This paper will give a detailed description on the thinned back-illuminated CCD imager design and fabrication, such as CCD chip thinning and thinned CCD backside treatment, as well as the technical parameters of different kinds of inverter type EBCCD. The performance of the proximity type EBCCD, the inverter type EBCCD and ICCD will also be compared and analyzed. Finaly, the present paper shows that these new, high performance devices of EBCCD are in an advantageous position for many applications in low-light-lev-el surveillance imaging, high energy physics and medical diagnostics.
Keywords： low-light-level imaging charge-coupled-devices electron-bombarded
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
Study on the Wavelet Packet Transform Method for Fault Diagnosis of Five Roller Orientation Clutch
Hu Binliang,Luo Yixin,Xie Ming
Strategic Study of CAE 2005, Volume 7, Issue 6, Pages 66-68
The theory and method of wavelet packet decomposition and its energy spectrum dealing with the fault of the overrunning clutch are presented in the paper. The characteristic frequency band of the fault can be identified by wavelet packet decomposition and its energy spectrum conveniently. At the same time, quantification analysis is performed. The result has shown that this method is more advantageous and of practical value than traditional Fourier analysis method.
Keywords： fault diagnosis wavelet packet energy spectrum clutch
Robust global route planning for an autonomous underwater vehicle in a stochastic environment Research Article
Jiaxin ZHANG, Meiqin LIU, Senlin ZHANG, Ronghao ZHENG
Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 11, Pages 1658-1672 doi: 10.1631/FITEE.2200026
This paper describes a route planner that enables an to selectively complete part of the predetermined tasks in the operating ocean area when the local path cost is stochastic. The problem is formulated as a variant of the . Based on the (GA), we propose the greedy strategy based GA (GGA) which includes a novel rebirth operator that maps infeasible individuals into the feasible solution space during evolution to improve the efficiency of the optimization, and use a differential evolution planner for providing the deterministic local path cost. The uncertainty of the local path cost comes from unpredictable obstacles, measurement error, and trajectory tracking error. To improve the robustness of the planner in an uncertain environment, a sampling strategy for path evaluation is designed, and the cost of a certain route is obtained by multiple sampling from the probability density functions of local paths. Monte Carlo simulations are used to verify the superiority and effectiveness of the planner. The promising simulation results show that the proposed GGA outperforms its counterparts by 4.7%–24.6% in terms of total profit, and the sampling-based GGA route planner (S-GGARP) improves the average profit by 5.5% compared to the GGA route planner (GGARP).
Keywords： Autonomous underwater vehicle Route planning Genetic algorithm Orienteering problem Stochastic path cost
Compact input-reflectionless balanced bandpass filter with flexible bandwidth using three-line coupled structure Research Article
Yahui ZHU, Jing CAI, Wei QIN, Wenwen YANG, Jianxin CHEN
Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 2, Pages 314-326 doi: 10.1631/FITEE.2200261
Keywords： Input-reflectionless filter Balanced bandpass filter (BPF) Differential mode (DM) Common mode (CM) Three-line coupled structure (TLCS)
A case study of oriented perforating technology for the multiple crack fracturing
Tang Meirong
Strategic Study of CAE 2012, Volume 14, Issue 4, Pages 105-112
It has been proved by successful experimental study and application of the new fracturing technology, which create two fracture, significantly improving contact area between fracture and low permeability reservoir, and increasing productivity as well. Normally the permeability of the low permeability block in the Changqing oil field is below 0.5 mD by low-permeable cores analysis. It is a tough task to development the oil through the general methods due to geological condition, watering well distribution and fracturing technology. Volume fracturing is proposed to increase the productivity by multiple crack fracturing since 2006 in Changqing oil field. The fracture initiated from the hole by the perforating shot, then turn the direction of the maximum level principal stress in the physical model research. Two lines of perforating shot are fired in the different depth of the oil reservoir, with an angular between the shots and the maximum level principal stress, liking letter “X”, paralleling in the distance. The oriented perforating technology for the multiple crack fracturing is presented and applied in the Changqing oil field. It is proved that multiple crack created by the downhole microseismic monitoring, productivity also increased 38.1 % compared to the adjacent by oriented perforating and multiple crack fracturing, the characteristics of the reservoir has been analyzed.
Keywords： oriented perforating fractural diverting multiple crack fracturing discharge volume increase in production
Yong Cai, Guang-Wen Chu, Yong Luo, Meng-Jun Su, Bao-Ju Wang, Bao-Chang Sun, Jian-Feng Chen
Engineering 2021, Volume 7, Issue 11, Pages 1603-1610 doi: 10.1016/j.eng.2020.03.020
Pollution involving pharmaceutical components in bodies of water is an increasingly serious environmental issue. Plasma discharge for the degradation of antibiotics is an emerging technology that may be relevant toward addressing this issue. In this work, a plasma-assisted rotating disk reactor (plasma-RDR) and a photocatalyst—namely, titanium dioxide (TiO2)—were coupled for the treatment of metronidazole (MNZ). Discharge uniformity was improved by the use of a rotating electrode in the plasma-RDR, which contributed to the utilization of ultraviolet (UV) light radiation in the presence of TiO2. The experimental results showed that the degradation efficiency of MNZ and the concentration of generated hydroxyl radicals respectively increased by 41% and 2.954 mg·L−1 as the rotational speed increased from 0 to 500 r·min−1. The synergistic effect of plasma-RDR plus TiO2 on the generation of hydroxyl radicals was evaluated. Major intermediate products were identified using three-dimensional (3D) excitation emission fluorescence matrices (EEFMs) and liquid chromatography–mass spectrometry (LC-MS), and a possible degradation pathway is proposed herein. This plasma-catalytic process has bright prospects in the field of antibiotics degradation.
Keywords： Plasma-assisted rotating disk reactor Pulsed discharge Metronidazole Degradation TiO2
The Stable Movement of Salty Water Soil and Pattern Researchof Removing the Salt
Zhou Heping,Peng Lixin,Xu Xiaobo
Strategic Study of CAE 2007, Volume 9, Issue 11, Pages 120-126
Through the research of the water-salt movement under different ground condition for the water saving irrigation in dry area, it has been found that there is the symptom of redistribution of water and salt in certain area:when the evolvement of water and salt movement occurs in vertical and horizontal direction, there is also the important symptom of sideward movement and has certain domino effect. This paper analyses the technology for treatment of the salt soil at home and abroad, and discusses the new mode of salt drainage under both the condition of water-salt directional movement and the condition of salt movement to the earth's surface. The study has the practical meaning for research and discussion on the new method of salt soil amending in dry agricultural area in China.
Keywords： water-salt directional movement new mode of salt dranage research and discussion
Zhu Huangqiu,Wu Liang,Zhou Yang,Zhang Tengchao,Deng Jianming
Strategic Study of CAE 2006, Volume 8, Issue 6, Pages 35-40
The bearingless permanent magnet synchronous motor (BPMSM) is an innovational type of motor, which has all excellence of magnetic bearings. In the paper, based on the basic working principle of BPMSM, the mathematical models of the radial forces and rotation part on BPMSM are deduced by adopting rotor magnetic field oriented control strategy. A digital vector control system according to the demand of decoupling is designed by using TMS320LF2407 DSP technique. The hardware and the software of the digital control system are developed in this paper. The experimental results have shown that the steady suspension of the rotor is realized and the speed of the rotor can be continuously adjusted within the range of 0〜3 000 r/min.
Keywords： bearingless permanent magnet synchronous motor decoupling control DSP digital control
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
Study on Cumulalive Energy Effect in Directional Fracture Controlled Blasting in Rock
Luo Yong,Shen Zhaowu
Strategic Study of CAE 2006, Volume 8, Issue 6, Pages 78-82
In order to solve the problems of stone exploitation, the mechanism of crack initiation and its expansion of directional fracture controlled blasting with linear cavity effect cutter in rock were roughly studied based on the theories of cumulative energy effect, mechanics of explosive and rock fracture mechanics, then the blasting parameters were designed and tested by model test in laboratory and field. The experimental results show that the energy from blasting can be directionally concentrated by the cumulative energy jet. The directional expansion of crack is satisfactory. Model test and field test suggest that the directional fracture controlled blasting with linear cavity effect cutter is a good means in excavating tunnels or cutting rock. It points out that the prospect of this method is promising. All these will give beneficial references to related theoretical study and field application.
Keywords： cumulative energy effect directional fracture controlled blasting model test liner fracture
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
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
Title Author Date Type Operation
A mechanical reliability study of 3-dB waveguide hybrid couplers in submillimeter and terahertz bands
Zhongqian Niu, Bo Zhang, Daotong Li, Dongfeng Ji, Yang Liu, Yinian Feng, Tianchi Zhou, Yaohui Zhang, Yong Fan,zhangbouestc@yeah.net
Journal Article
Research on Direction and Location for Danger Prediction of Coal or Rock Dynamic Disaster
Xiao Hohgfei,He Xueqiu,Feng Tao,Wang Enyuan
Journal Article
High Sensitive Electron-Bombarded CCD for Low Light Level Imaging
Zhou Liwei,Liu Guangrong,Gao Zhiyun,Wang Zhongchun
Journal Article
The burnup calculation for in-hospital neutron irradiator mark 1 reactor based on coupled code of WIMS and MCNP
Guo Hewei,Jiang Xinbiao,Zhao Zhumin,Chen Lixin,Zhang Xinyi,Zhou Yongmao
Journal Article
Study on the Wavelet Packet Transform Method for Fault Diagnosis of Five Roller Orientation Clutch
Hu Binliang,Luo Yixin,Xie Ming
Journal Article
Robust global route planning for an autonomous underwater vehicle in a stochastic environment
Jiaxin ZHANG, Meiqin LIU, Senlin ZHANG, Ronghao ZHENG
Journal Article
Compact input-reflectionless balanced bandpass filter with flexible bandwidth using three-line coupled structure
Yahui ZHU, Jing CAI, Wei QIN, Wenwen YANG, Jianxin CHEN
Journal Article
A case study of oriented perforating technology for the multiple crack fracturing
Tang Meirong
Journal Article
An Evaluation of Metronidazole Degradation in a Plasma-Assisted Rotating Disk Reactor Coupled with TiO2 in Aqueous Solution
Yong Cai, Guang-Wen Chu, Yong Luo, Meng-Jun Su, Bao-Ju Wang, Bao-Chang Sun, Jian-Feng Chen
Journal Article
The Stable Movement of Salty Water Soil and Pattern Researchof Removing the Salt
Zhou Heping,Peng Lixin,Xu Xiaobo
Journal Article
The Research on Rotor Magnetic Flux Oriented Control System for Bearingless Permanent Magnet Synchronous Motor
Zhu Huangqiu,Wu Liang,Zhou Yang,Zhang Tengchao,Deng Jianming
Journal Article
Statistical Energy Analysis for Complicated Coupled System and Its Application in Engineering
Sheng Meiping
Journal Article
Study on Cumulalive Energy Effect in Directional Fracture Controlled Blasting in Rock
Luo Yong,Shen Zhaowu
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
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