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千兆赫片上互联单壁纳米碳管电分析 Article

Zamshed Iqbal CHOWDHURY,Md. Istiaque RAHAMAN,M. Shamim KAISER

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 2,   Pages 262-271 doi: 10.1631/FITEE.1500349

Abstract: 本文针对不同结构构型的单壁纳米碳管，对高质量互联中四项重要的四项电参数——阻抗，传播常量，电流密度以及信号延时进行了推导。每个参数均表现出了对其设计互联频率范围和构型的强相关性。

Keywords： 互联；碳纳米管；电流密度；传播常量；特性阻抗；片上系统    

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Characteristic of the equivalent impedance for an Article

Zhi-zhong TAN, Hong ZHU, Jihad H. ASAD, Chen XU, Hua TANG

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 12,   Pages 2070-2081 doi: 10.1631/FITEE.1700037

Abstract: Considerable progress has been made recently in the development of techniques to determine exactly two-point resistances in networks of various topologies. In particular, a general resistance formula of a non-regular × resistor network with an arbitrary boundary is determined by the recursion-transform (RT) method. However, research on the complex impedance network is more difficult than that on the resistor network, and it is a problem worthy of study since the equivalent impedance has many different properties from equivalent resistance. In this study, the equivalent impedance of a non-regular × RLC network with an arbitrary boundary is studied based on the resistance formula, and the oscillation characteristics and resonance properties of the equivalent impedance are discovered. In the RLC network, it is found that our formula leads to the occurrence of resonances at the boundary condition holding a series of specific values with an external alternating current source. This curious result suggests the possibility of practical applications of our formula to resonant circuits.

Keywords： RLC network     Resonance properties     Oscillation characteristics     Amplitude-frequency    

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A fractional-order multifunctionaln-step honeycomb RLC circuit network Article

Ling ZHOU, Zhi-zhong TAN, Qing-hua ZHANG

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 8,   Pages 1186-1196 doi: 10.1631/FITEE.1601560

Abstract: We investigate a multifunctional -step honeycomb network which has not been studied before. By adjusting the circuit parameters, such a network can be transformed into several different networks with a variety of functions, such as a regular ladder network and a triangular network. We derive two new formulae for equivalent resistance in the resistor network and equivalent impedance in the LC network, which are in the fractional-order domain. First, we simplify the complex network into a simple equivalent model. Second, using Kirchhoff’s laws, we establish a fractional difference equation. Third, we construct an equivalent transformation method to obtain a general solution for the nonlinear differential equation. In practical applications, several interesting special results are obtained. In particular, an step impedance LC network is discussed and many new characteristics of complex impedance have been found.

Keywords： Honeycomb network     Equivalent transformation     Fractional differential equation     Impedance characteristics    

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New method to determine optimum impedance of fault current limiters for symmetrical and/or asymmetrical faults in power systems None

Mahmoud MODARESI, Hamid LESANI

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 2,   Pages 297-307 doi: 10.1631/FITEE.1601689

Abstract: To select the type and value of the impedance of fault current limiters (FCLs) for power network designers, we introduce a new method to calculate the optimum value of FCL impedance depending on its position in the network. Due to the complexity of its impedance, the costs of both real and imaginary parts of FCL impedance are considered. The optimization of FCL impedance is based on a goal function that maximizes the reduction of the fault current while minimizing the costs. While the position of FCL in the network has an effect on the calculation of the optimum impedance value, the method for selecting FCL location is not the focus of this study. The proposed method for optimizing FCL impedance can be used for every network that has symmetrical and/or asymmetrical faults. We use a 14-bus IEEE network as an example to explain the process. The optimum FCL impedance used in this network is calculated by considering the vast range of costs for both real and imaginary parts of FCL impedance.

Keywords： Fault current limiter (FCL)     FCL impedance     Short circuit current     Fault current     Power system    

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Human–Robot Collaboration Framework Based on Impedance Control in Robotic Assembly Article

Xingwei Zhao,Yiming Chen,Lu Qian,Bo Tao,Han Ding

Engineering 2023, Volume 30, Issue 11,   Pages 83-92 doi: 10.1016/j.eng.2022.08.022

Abstract:

Human–robot (HR) collaboration (HRC) is an emerging research field because of the complementary advantages of humans and robots. An HRC framework for robotic assembly based on impedance control is proposed in this paper. In the HRC framework, the human is the decision maker, the robot acts as the executor, while the assembly environment provides constraints. The robot is the main executor to perform the assembly action, which has the position control, drag and drop, positive impedance control, and negative impedance control modes. To reveal the characteristics of the HRC framework, the switch condition map of different control modes and the stability analysis of the HR coupled system are discussed. In the end, HRC assembly experiments are conducted, where the HRC assembly task can be accomplished when the assembling tolerance is 0.08 mm or with the interference fit. Experiments show that the HRC assembly has the complementary advantages of humans and robots and is efficient in finishing complex assembly tasks.

Keywords： Human–robot collaboration     Impedance control     Robotic assembly    

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Fuzzy impedance control of an electro-hydraulic actuator with an extended disturbance observer Regular Papers-Research Articles

Ming-jie LI, Jian-hua WEI, Jin-hui FANG, Wen-zhuo SHI, Kai GUO

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 9,   Pages 1221-1233 doi: 10.1631/FITEE.1800155

Abstract: In this paper, we deal with both velocity control and force control of a single-rod electro-hydraulic actuator subject to external disturbances and parameter uncertainties. In some implementations, both velocity control and force control are required. Impedance control and an extended disturbance observer are combined to solve this issue. Impedance control is applied to regulate the dynamic relationship between the velocity and output force of the actuator, which can help avoid impact and keep a proper contact force on the environment or workpieces. Parameters of impedance rules are regulated by a fuzzy algorithm. An extended disturbance observer is employed to account for external disturbances and parameter uncertainties to achieve an accurate velocity tracking. A detailed model of load force dynamics is presented for the development of the extended disturbance observer. The stability of the whole system is analyzed. Experimental results demonstrate that the proposed control strategy has not only a high velocity tracking performance, but also a good force adjustment performance, and that it should be widely applied in construction and assembly.

Keywords： Fuzzy control     Impedance control     Disturbance observer     Parameter uncertainties     Electro-hydraulic actuator    

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Electrically tunable liquid crystal coplanar waveguide stepped-impedance resonator Research Articles

Xingye Fan, Ruozhou Li, Jing Yan, Yuming Fang, Ying Yu,jing.yan@njupt.edu.cn,ying_yu_001@163.com

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 9,   Pages 1270-1276 doi: 10.1631/FITEE.2000278

Abstract: A tunable stepped-impedance resonator using is demonstrated. Two resonant frequencies at 3.367 and 7.198 GHz are realized and can be continuously tuned by external applied voltages. Continuous tunable ranges of 52 and 210 MHz have been achieved at a particularly low driving voltage of 14 V, which shows good agreement with the simulation results. The voltage-induced hysteresis phenomenon is also investigated. This device also has a low insertion loss of −2.9 and −4 dB for the two resonant frequencies and the return losses are less than −21.5 dB. This work provides a new protocol to realize a tunable frequency for communication systems.

Keywords： 可调阶梯阻抗谐振器；液晶；共面波导    

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The Pendulum Characteristic of Natural Convection Gas and the Application for Sensor

Zhang Fuxue

Strategic Study of CAE 2002, Volume 4, Issue 8,   Pages 50-53

Abstract:

It is discovered that the natural convection gas has the pendulum characteristic, so the new concept of gas pendulum is presented. In this paper, the buoyancy lift of natural convection gas is analyzed in a hermetic chamber, and given the formula between the buoyancy lift and the change of temperature. The results of experiment have shown that gas pendulum can be utilized to measure the acceleration and tilt angle as same as solid pendulum and liquid pendulum.

Keywords： gas pendulum characteristic     tilt sensor     accelerometer    

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Sonic General Non-destructive Testing Technique

Chen Jimao

Strategic Study of CAE 2000, Volume 2, Issue 4,   Pages 64-69

Abstract:

This paper describes new general multi-mode non-destructive testing (NDT) of composite materials and bonded structures for detecting discontinuities (defects) , the only multi-mode one of its kinds. This technique which is based on sonic and ultrasonic testing performs five different modes of testing to detect disbond, unbond, delamination, porosity, crushed core and other defects in composite materials and bonded structures. It equally suits for applications in manufacturing, maintenance and repair of composite materials and structures which almost include them in common use now availability. Good repeatability and reliability have been found. This paper discusses the principles of the five sonic mode constitute multi-mode sonic general bondtester and demostrates the vast range of propect for general NDT from our and our internal and external comrades* much practical experinence.

Keywords： sonic general testing     general non-destructive testing (NDT)     non-destructive testing of composite materials     mechanical impedance analysis (MIA)     vibration analysis (VA)     resonance testing    

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Dynamic behavior analysis of Taizhou Bridge

Ruan Jing,Ma Rujin

Strategic Study of CAE 2010, Volume 12, Issue 8,   Pages 83-87

Abstract:

The dynamic behaviors have critical influences on the design of structure dynamics, health monitoring and maintenances. The three- pylon two-span suspension bridge does have different static and dynamic behaviors comparing with traditional one-span suspension bridge. This paper analyzes the dynamic behavior of Taizhou Bridge under construction stage and operation stage based on ANSYS. Some meaningful results have been obtained and can provide references for engineers in the further.

Keywords： three-pylon two-span suspension bridge     dynamic property     self-vibration frequency     vibration shape    

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Pressure Drop Characteristics of Flow Boiling in Microchannel With Low Aspect Ratio

Zhang Binglei,Xu Jinliang and Xiao Zejun

Strategic Study of CAE 2007, Volume 9, Issue 12,   Pages 86-93

Abstract: Pressure drops of flow boiling in a single microchannel having low aspect ratio were studied with effects of the inlet temperature，mass flux，heat flux and the inclined angle using methanol as working fluid. The present experimental data were compared with the predictions of the homogeneous flow model and separated flow model respectively. The comparison indicates that the homogeneous flow model cannot predict the twophase pressure drop well except using the twophase viscosity model of the Dukler correlation. With the existing correlations for parameter C in LockhartMartinelli correlation such as Chisholm,Lee and Lee,Mishima,Qu and Mudawar , separated flow model also failed to predict the twophase pressure drop in the microchannel of this study . The experimental data in this work show that the interaction between vapor phase and liquid phase is decreased with the increasing quality when the quality reach a certain value , accordingly there needs a correlation for C which decreased with the decreasing mass flux .A new correlation to predict the twophase flow pressure drop in microchannels was developed in the form of the LockhartMartinelli correlation .It includes the effect of the hydraulic diameter and the effect of mass flux on the twophase flow pressure drop in microchannels .The new correlation developed in this study predicted the experimental data within a mean absolute error of 16.9%.

Keywords： pressure drop characteristics；homogeneous flow model；separated flow model；microchannel；flow boiling    

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Exploring the growth and development properties of early variety of winter rapeseed

Guan Chunyun,Jin Furong,Dong Guoyun,Guan Mei,Tan Tailong

Strategic Study of CAE 2012, Volume 14, Issue 11,   Pages 4-12

Abstract:

Nineteen early mature varieties of winter rape and one spring rape variety were sowed in different plots separately at 10 d interval. The growth and development characteristics of early mature variety of winter rape were explored. Results indicate: The complete growth period of early mature variety of winter rape should be approximately 180 days. Both springness and weak response to photoperiod should be their good trait for early mature variety of winter rape. Sowing time would be in late October. And in that sowing time early flowering than normal can be prevented, and also maturity rapseed can be expect in next year' late April. Early mature variety excels in growth properties than the faintly winter varieties, which belong to medium mature rapeseed, and the former gets the seedling stage around 40 days, budding stage around 70 days, flowering stage around 40 days and ripening stage around 30 days. Days from seedling to end of flower are positively correlation with days from seedling to ripening (r≥0.90). 5 Spring rape varieties from Qinghai is weak in response to photoperiod and can be used as early mature variety of winter rape, but long elapse rosette period and flowering stage more concentrated type are much better.

Keywords： winter rapeseed     early variety     growth and development properties    

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Study on Control Characteristics of a Secondary Regulated Loading System

Zhan Xingqun,Zhang Yanhua,Zhao Keding

Strategic Study of CAE 2000, Volume 2, Issue 7,   Pages 47-54

Abstract:

Secondary regulation is novel hydraulic transmission technology which possesses many outstanding advantages, such as convenient controlling, easily composing network components just like that in an electric system, and even simpler energy recovering and regeneration than in an electric system. Researches in secondary regulation technology will have no hesitation to enlarge the application scope and enhance the product competitive power of the hydaulic system. Torque servo loading system is a typical equipment in secondary regulation research with; briniant application future. In the paper, by modeling a secondary regulated torque loading system in detail, some nature dynamic characteristics of secondary regulation technology is analyzed. Finally, a computer control system of the secondary regulated loading equipment is established and several experimental curves prove the theoretical analyzing results.

Keywords： hydrostatic driving     secondary regulation     loading     mathematical model     dynamic characteristics    

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Electrochemical characterization methods of the key materials for SOFC

Fan Liquan,Zhao Erqing and Gao Keqing

Strategic Study of CAE 2013, Volume 15, Issue 2,   Pages 50-56

Abstract:

Solid oxide fuel cells (SOFCs) are the solid-state devices for generating electricity from the chemical energy. The effect of solid oxide materials on the performance of SOFC is especially important. From the influence of materials on electrochemical performance of SOFC, this paper summarizes electrochemical characterization methods for the composition materials of SOFC briefly based on the fundamentals of electrochemistry and solid electrochemistry. Some research experience is also included in the paper, which can facilitate the further research of materials.

Keywords： solid oxide materials     direct current polarization     alternating current impedance     solid oxide fuel cell    

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The Method to Identify Dynamic Characteristics of Hydro Plant's Supporting Structure Using Machine Halting Process

Lian Jijian,Tian Huijing,Qin Liang,Zhang Yongji

Strategic Study of CAE 2006, Volume 8, Issue 4,   Pages 72-75

Abstract:

During running process, the effect of dynamic loads is quite complex. So determining dynamic characteristics of supporting structure are of great importance when making hydro plant's dynamic analysis. However, conventional testing measures often cause intensive destruction or are too complicated to implement. In order to solving above problems，this paper，basing on principle of dynamics, applies the test data to analyze the structure vibration and variability of loads during machine halting process，and further puts forward a new method to identify dynamic characteristics of hydro plants supporting structure using machine halting process. The test data comes from prototype observation in Lijiaxia's power house structure of two-row placed units. The method, combining unit test and structure test result, and fully using advantage of wavelet analysis, successfully overcomes poor factor like long variation time of loads，vibration fluctuation，etc.,when analyzing halting problem.

Keywords： supporting structure of power house     machine halting process     dynamic characteristics     wavelet analysis    

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Title Author Date Type Operation

千兆赫片上互联单壁纳米碳管电分析

Zamshed Iqbal CHOWDHURY,Md. Istiaque RAHAMAN,M. Shamim KAISER

Journal Article

Characteristic of the equivalent impedance for an

Zhi-zhong TAN, Hong ZHU, Jihad H. ASAD, Chen XU, Hua TANG

Journal Article

A fractional-order multifunctionaln-step honeycomb RLC circuit network

Ling ZHOU, Zhi-zhong TAN, Qing-hua ZHANG

Journal Article

New method to determine optimum impedance of fault current limiters for symmetrical and/or asymmetrical faults in power systems

Mahmoud MODARESI, Hamid LESANI

Journal Article

Human–Robot Collaboration Framework Based on Impedance Control in Robotic Assembly

Xingwei Zhao,Yiming Chen,Lu Qian,Bo Tao,Han Ding

Journal Article

Fuzzy impedance control of an electro-hydraulic actuator with an extended disturbance observer

Ming-jie LI, Jian-hua WEI, Jin-hui FANG, Wen-zhuo SHI, Kai GUO

Journal Article

Electrically tunable liquid crystal coplanar waveguide stepped-impedance resonator

Xingye Fan, Ruozhou Li, Jing Yan, Yuming Fang, Ying Yu,jing.yan@njupt.edu.cn,ying_yu_001@163.com

Journal Article

The Pendulum Characteristic of Natural Convection Gas and the Application for Sensor

Zhang Fuxue

Journal Article

Sonic General Non-destructive Testing Technique

Chen Jimao

Journal Article

Dynamic behavior analysis of Taizhou Bridge

Ruan Jing,Ma Rujin

Journal Article

Pressure Drop Characteristics of Flow Boiling in Microchannel With Low Aspect Ratio

Zhang Binglei,Xu Jinliang and Xiao Zejun

Journal Article

Exploring the growth and development properties of early variety of winter rapeseed

Guan Chunyun,Jin Furong,Dong Guoyun,Guan Mei,Tan Tailong

Journal Article

Study on Control Characteristics of a Secondary Regulated Loading System

Zhan Xingqun,Zhang Yanhua,Zhao Keding

Journal Article

Electrochemical characterization methods of the key materials for SOFC

Fan Liquan,Zhao Erqing and Gao Keqing

Journal Article

The Method to Identify Dynamic Characteristics of Hydro Plant's Supporting Structure Using Machine Halting Process

Lian Jijian,Tian Huijing,Qin Liang,Zhang Yongji

Journal Article