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Optimal two-impulse space interception with multiple constraints Research Articles
Li Xie, Yi-qun Zhang, Jun-yan Xu,lixie@ncepu.edu.cn,yiqunzhang@hotmail.com,junyan_Xu@sina.cn
Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 7, Pages 963-1118 doi: 10.1631/FITEE.1800763
Dai Juchuan,Wu Xinkai,Wen Li
Strategic Study of CAE 2009, Volume 11, Issue 4, Pages 91-95
In direct torque control system, the PID controller is often adopted to be the speed adjuster. When disturbances are thrown to the motor, a long time is taken to renew the motor to steady state. In this paper, new auto-disturbance-rejection controller (ADRC) is introduced into direct torque control system. Instead of PID speed adjuster, ADRC speed adjuster is designed. The speed observer is designed based on model reference adaptive system (MRAS), too. The performance difference is analyzed between PID controller and ADRC in speed sensorless direct torque control system. The simulation results show that the AC speed adjustable system has speedier response performance, stronger disturbance-rejection performance when ADRC is adopted. Moreover, according to simulation results, there is smaller warp between motor command speed and actual speed when motor parameters perturb.
Keywords： direct torque control active disturbances rejection control speed observer speed sensorless induction motor
Calculation Method of Explosively Formed Projectile Velocity
Zhao Huiying,Shen Zhaowu
Strategic Study of CAE 2007, Volume 9, Issue 8, Pages 62-65
From the theory of instantaneous expansion of detonation product and momentum conservation, this paper obtains velocity calculation model of explosively formed projectile (EFP) and the model is revised due to the influence of the ratio of charge altitude to charge diameter. This paper calculates the velocities of EFPs formed by large apex angle liner and sphere liner through the velocity calculation model and the results are consistent with the numerical simulation and experiment results. This velocity calculation model is applicable in engineering.
Keywords： explosively formed projectile (EFP) instantaneous expansion of detonation product momentum conservation EFP velocity
The Development of Technology for Pulsed X-ray Simulators
Qiu Aici
Strategic Study of CAE 2000, Volume 2, Issue 9, Pages 24-28
In this paper is given briefly a survey of situation of simulating pulsed x-ray with high current pulsed electron beam accelerator. It´s indicated that technology of high pulsed power Z-pinch has vast application prospects in the realization of ultraintensive pulsed x-ray simulator and ICF driver as a chief technological way. Also are described the progress and the current status of simulators for pulsed x-ray in China, and proposals for the future development of Z-pinch technology.
Keywords： pulsed x-ray high pulsed power technology pulsed electron beam accelerator Z-pinch ICF
Design of hydraulic resonance of pulsed water - jet
Pu Jianing,Chen Ming
Strategic Study of CAE 2009, Volume 11, Issue 2, Pages 36-42
By setting a sinusoidal pulsed flow generator and an air chamber at the head and midst of conduit respectively , and elaborately structuring conditions of water jet system , a strong hydraulic resonance can be induced and pressure amplitude at nozzle can be greatly promoted . The mathematical- physical model of the system is illuminated with characteristics finite difference equations of hydraulic transient and solved by variable time step method . The conditions of desirable resonance are searched by direct search algorithm of Matlab . The sinusoidal pulsed flow generator is composed of a constant discharge pump and a piston cylinder fluctuating sinusoidally in volume . The constant discharge is provided by an electric piston pump driven by cam mechanism , and the sinusoidal volume fluctuation of the cylinder is produced by motion of piston driven by cam or crankshaft mechanism .
Keywords： pulsed water- jet hydraulic resonance method of characteristics variable time step method Matlab direct search algorithm sinusoidal pulsed flow generator
Asurvey on complex dynamical networkswith impulsive effects Review Articles
Xiu-ping HAN, Yong-shun ZHAO, Xiao-di LI
Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 2, Pages 199-219 doi: 10.1631/FITEE.1900456
Keywords： Complex dynamical networks Synchronizing impulses Desynchronizing impulses Pinning control Time delay
Ping Sheng
Engineering 2021, Volume 7, Issue 5, Pages 552-553 doi: 10.1016/j.eng.2021.02.003
The Influence of Flow Velocity on Response Sensitivity of Smoke Detectors
Xie Qiyuan,Su Guofeng,Yuan Hongyong,Zhang Yongming
Strategic Study of CAE 2005, Volume 7, Issue 11, Pages 76-80
The objective of the work was to evaluate the performance of photoelectric and ionic smoke detectors at different flow velocities through the Fire Emulator/Detector Evaluator ( FE/DE). That was accomplished through a series of experiments at different flow velocity, with the same smoldering cottons put directly at the entrance of the FE/DE and in box, respectively. The experiment results indicate that the sensitivity of the two kinds of smoke detectors decreases sharply while the flow velocity around them increases, with the smoldering cottons in the box. However, for the smoldering cottons at the entrance of FE/DE, the sensitivity of the ionic smoke detector does not fall down as sharply as the photoelectric detector. In this case, ionic detectors show better sensitivity than the photoelectric ones. Accordingly, the ionization smoke detector is more suitable for those locations with high flow velocity.
Keywords： flow velocity smoke detectors smoke particle size distribution of particles
Ning Duan
Engineering 2018, Volume 4, Issue 3, Pages 299-299 doi: 10.1016/j.eng.2018.05.016
Several Theoretical Problems in Faster-than-Light Research
Huang Zhixun,Geng Tianming
Strategic Study of CAE 2007, Volume 9, Issue 4, Pages 6-17
In the early stage of the universe, during the hadronic era, the light velocity was larger than c, in fact was v=75c. This implies that light velocity has been decreasing in time slowly, from v down to the present value c. On the other hand, based on the measurements of 128 quasar absorption lines, the average increase in fine-structure constantαwas6×10-6 over the past 6~12Ga. Scientists think it was aroused by the light-speed variation. It would be interesting to investigate if these facts have influenced the past history of the universe. This paper also discusses some problems of faster-than-light research profoundly, such as the velocity definition of the microscopic particles, the velocity of gravitation, the interaction speed of the quantum-entangle-state(QES), and the over distance action.
Keywords： variable light velocity faster-than-light velocity of microscopic particles velocity ofgravitation interaction speed of the QES over distance action
Chen Xiaohong
Strategic Study of CAE 2013, Volume 15, Issue 11, Pages 87-91
The research did in-depth analysis on the strategic planning of the construction of "Two-Oriented Society" and ecological civilization made by the 18th CPC National Congress, elaborated the internal connections between the construction of ecological civilization and " Two-Oriented Society", described the practice and achievements of promoting the construction of ecological civilization using "Two-Oriented Society" as the main focus in the Comprehensive Coordinated Reform Trial Areas of the"Two-Oriented Society "in Chang-Zhu-Tan City Cluster. Based on this, the research pointed out structural and institutional obstacles and problems in further promoting the construction of "Two-Oriented Society" and ecological civilization. Finally,focusing on reform and innovation,the research provided suggestions to deepen the reform of the construction of "Two-Oriented Society" and ecological civilization in four aspects,such as dividend of institution,dividend of nomocracy, dividend of development and dividend of market.
Keywords： ecological civilization Two-Oriented Society reform and innovation
The Optimization of the Monopulse Antenna Based on Genetic Algorithms
Wang Hongjian,Gao Benqing,Liu Ruixiang
Strategic Study of CAE 2002, Volume 4, Issue 5, Pages 84-87
The sum and difference patterns as well as the directivity of the monopulse antenna arrays are optimized based on genetic algorithms (GA). When only the sum pattern is optimized as usual, the difference pattern and gain can not be guaranteed, so the track precision and effective distance of the antenna or missile will be impaired. However, using GA, the sum pattern, difference pattern and directivity can be optimized thoroughly for the antenna design.
Keywords： monopulse antenna array genetic algorithm pattern directivity
An Area Changeable Capacitive Micro-machined Accelerometer
Li Baoqing,Lu Deren,Wang Weiyuan
Strategic Study of CAE 2000, Volume 2, Issue 2, Pages 36-40
In this paper, a newly developed accelerometer based on the principle of area changeable capacitance is presented at the first time. The movable mass is designed as many bars connected together and suspended by elastic beams. Two comb-shaped fixed electrodes with their fingers side by side are alternately placed under the mass. The mass moves in the direction parallel with the substrate plane under the effect of acceleration. The movable mass and fixed electrodes compose a differential capacitor unit. It is concluded by theoretical analysis that the signal of the acceleration is only proportionally related to the area between movable mass and fixed electrodes but not related to the gap between them. The parasitic capacitance Cp between the mass and fixed electrodes and CB induced by boundary effect both lower the sensitivity of the accelerometer by about 20 % , and lead to a vertical effect on accelerometer that could be ignored if compared with the sensitivity. The quasi-LIGA technology with Ni as structure layer and Cu as sacrificial layer is used to fabricate the sensor chips. The fixed electrodes are fabricated on a glass substrate. A Cu sacrificial layer used to determine the gap between the mass and fixed electrodes is then electroplated with the fixed electrodes layer. Finally, the movable Ni mass is also electroplated with the Cu layer and is released after selective etch of the Cu layer. After packaging in IC ceramic die under atmosphere, the accelerometer is put on avibrator to be tested under a frequency of 25 Hz. The output signal is connected to the interface circuit with electric wires. The experimental results show that the accelerometer has typical sensitivity of 58.1 mV/ (m·s-2) and non-linearity of 4% FS in operating range of 20 m/s2. The obtained non-linearity is not ideal and the reason is discussed based on experimental conditions
Keywords： capacitance accelerometer area changeable
Research on Water Velocity in Filling up Section of Horizontal Pipe
Wang Dongmei,Zhang Shilin
Strategic Study of CAE 2005, Volume 7, Issue 2, Pages 66-68
The article divides the whole section into two sections. One is arcuate section. The other is seepage section. Water velocity distribution in circular section of pipe has been studied for a long time, and advanced theories were achieved. Based on fore theory and some tentatives, theory about distribution of water velocity in pipe of arcuate section is researched. Research of seepage section is based on seeping theory. Many experiments proved that the theory and program of this article are correct.
Keywords： arcuate section filling up bed water velocity zero shear point water-power gradient
Hu Yongjun, Wu Jian, Hu Ruishan
Strategic Study of CAE 2019, Volume 21, Issue 5, Pages 151-158 doi: 10.15302/J-SSCAE-2019.05.004
The “two mountain” theory (i.e., lucid waters and lush mountains are invaluable assets) is the core concept for ecological civilization construction in China, and it will guide the development of ecological civilization throughout the country for a long time.This paper aims to provide paths and models for ecological civilization construction and rural revitalization, thus to enrich the “two mountains” theory. The economic growth theory and the externality theory are applied to analyze the core logic for realizing the value of ecological products and the internal logic of green growth, and the basic routes for “two mountains” practices are proposed. The core logic for realizing the value of ecological products is to guide and standardize the ecologization of economic subjects in the micro level, and the main paths include collecting ecological tax and dues, building up eco-market, taking ecological compensation, and establishing a green financial market. The internal logic of regional green growth is a positive cycle of transformation, coordination, and feedback between the ecology and “space–industry–main body”, and the main paths include space planning, ecological construction, ecological beautification, ecological industry, ecologization of traditional industry, high-end industry, ecological culture,ecological system, and ecological technology. This study is hoped to provide a reference for the top-level framework and development models for national ecological civilization construction and rural revitalization.
Keywords： ecological civilization construction “two mountains” theory logic path
Title Author Date Type Operation
Optimal two-impulse space interception with multiple constraints
Li Xie, Yi-qun Zhang, Jun-yan Xu,lixie@ncepu.edu.cn,yiqunzhang@hotmail.com,junyan_Xu@sina.cn
Journal Article
Study on auto-disturbances-rejection AC adjustable speed based on speed sensorless direct torque control
Dai Juchuan,Wu Xinkai,Wen Li
Journal Article
Calculation Method of Explosively Formed Projectile Velocity
Zhao Huiying,Shen Zhaowu
Journal Article
Asurvey on complex dynamical networkswith impulsive effects
Xiu-ping HAN, Yong-shun ZHAO, Xiao-di LI
Journal Article
The Influence of Flow Velocity on Response Sensitivity of Smoke Detectors
Xie Qiyuan,Su Guofeng,Yuan Hongyong,Zhang Yongming
Journal Article
When Will Speed of Progress in Green Science and Technology Exceed that of Resource Exploitation and Pollutant Generation?
Ning Duan
Journal Article
Several Theoretical Problems in Faster-than-Light Research
Huang Zhixun,Geng Tianming
Journal Article
The practice and reflection on promoting ecological civilization construction by deepening the reform of construction of“Two-Oriented Society”
Chen Xiaohong
Journal Article
The Optimization of the Monopulse Antenna Based on Genetic Algorithms
Wang Hongjian,Gao Benqing,Liu Ruixiang
Journal Article
An Area Changeable Capacitive Micro-machined Accelerometer
Li Baoqing,Lu Deren,Wang Weiyuan
Journal Article
Research on Water Velocity in Filling up Section of Horizontal Pipe
Wang Dongmei,Zhang Shilin
Journal Article
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