Tài liệu Điện - Điện tử
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The paper applies Bolzmann equation and gas molecular dynamics theory and analyzes the motion state of plasma internal particle and electromagnetic field distribution around antenna through modeling, It based on the cylindrical unipolar surface wave plasma antenna structure.
3/29/2020 12:30:16 PM +00:00
This paper proposes a hybrid control strategy of single-phase inverter, and it makes combination the fuzzy control technology and instantaneous feedback control technology of the current, and it solves the problem of load uncertainty and load model is difficult to established.
3/29/2020 12:30:09 PM +00:00
In this work, we evaluate the probability of falling metal structures from transmission lines. It is our objective to extract knowledge about which variables influence the mechanical behavior of the operating lines and can be used to diagnose potential falling towers.
3/29/2020 12:30:03 PM +00:00
This paper proposes a novel controllable BIST circuit. The controllable BIST circuit provides a cost-effective solution that supports a variety of March algorithms and SRAM embedded testing operation modes. It controls the test patterns with three additional input ports.
3/29/2020 12:29:57 PM +00:00
Activity handover within engineering construction projects is time consuming, takes longer than the actual activities, and therefore, can cause duration delays. This paper presents relay chain seamless handover (RCSH) technology, which is based on relay technology theory and actor-network theory.
3/29/2020 12:29:50 PM +00:00
This paper introduces a mathematical model for Pulse-Width Modulated Amplifier for DC Servo Motor. The relationship between pulse-width modulated (PWM) signal and reference rotation speed is specified, and a general model of motor represented by transfer function is also put forward.
3/29/2020 12:29:44 PM +00:00
From the pespective of relationship orientation, this paper focuses in studying how communication inluences business cooperation.
3/29/2020 12:29:38 PM +00:00
In this paper, we introduced the basic principles of energy saving generation dispatching, generated sorting table and implementation processes, implemented energy-saving generation dispatching optimal electric power industry structure and layout. From the terms of the pilot provinces, energy-saving generation dispatching pilots achieved remarkable results.
3/29/2020 12:29:32 PM +00:00
For disadvantages of the large flux and torque ripple and current waveform distortion of Direct Torque Control (BASIC-DTC), the DTC scheme for induction motor based on torque angle closed-loop control was presented and the proposed scheme was realized with three methods of torque angle closed-loop control.
3/29/2020 12:29:25 PM +00:00
For resolving the problem that power filter cannot work normally because TCR (thyristor controlled reactor) generates extra third harmonic current under asymmetrical voltage, the paper proposes the estimation method of current capacity that TCR generates extra third harmonic current under asymmetrical voltage.
3/29/2020 12:29:19 PM +00:00
In this paper, dual-rotor permanent magnet induction motor (DRPMIM) is studied to improve performance of usual induction motor(IM). Two-dimensional finite element model for DRPMIM is established by Maxwell Ansoft software, and electromagnetic characters of that was analyzed.
3/29/2020 12:29:13 PM +00:00
Non-ideal factors of transmitting signal are known as a kind of restriction to the performance of radar, especially the ability of finding the weak target. In this paper, the performance of MIMO radar in the aspect of weak target detection is researched. Firstly, the theory model of MIMO signal is presented.
3/29/2020 12:29:07 PM +00:00
Marine electromagnetic transmitter transmits large power variable frequency electromagnetic wave to the seabed so as to obtain the submarine structure and mineral resources. The mathematical model of controlled source circuit needs to be established to realize closed loop control for increasing control precision and output transient performance of the electromagnetic wave.
3/29/2020 12:29:00 PM +00:00
Precise measurement of dielectric loss angle is very important for electric capacity equipment in recent power systems. When signal-to-noise is low and fundamental frequency is fluctuating, aiming at the measuring error of dielectric loss angle based on some recent Fourier transform and wavelet transform harmonics analysis method.
3/29/2020 12:28:54 PM +00:00
Islanding detection is one of the indispensable protection detections for grid-connected inverters. The detection of islanding is the key factor that should be considered in the analysis of grid-connection security.
3/29/2020 12:28:48 PM +00:00
In order to optimize the electric energy quality of HVDC access point, a modular multilevel selective harmonic elimination pulse-width modulation (MSHE-PWM) method is proposed. On the basis of keeping the minimum action frequency of the power device, MSHE-PWM method can meet the requirement for accurately eliminating low-order harmonics in the output PWM waveform.
3/29/2020 12:28:42 PM +00:00
During the process of using traditional particle swarm optimization (PSO) to identify electric parameters, the algorithm can be easily caught in locally optimal solution, thus leading to relatively large identification result error.
3/29/2020 12:28:36 PM +00:00
To study surface denoising of lithium battery film to extract feature effectively. The best atomic function by sparse decomposition is acquired by iteration under added noise, gaussian noise, salt and pepper noise, additive and multiplicative noise.
3/29/2020 12:28:30 PM +00:00
This paper explores the influence of MOOC for the improvement of college students of electrical engineering based on the cloud platform and Moodle. MOOC-‘Massive Open Online Class’ is a new way of providing education along with the integration of network information technology and the educational teaching.
3/29/2020 12:28:23 PM +00:00
According to the bullet of cluster bombs in the separated Rotate- speed, dispensing overload, parachuteopening overload, landing overload and other parameters testing background, this paper designs a intelligent storage recording system which selects a the thin film geomagnetic sensor and photoelectric accelerometer as the sensitive unit, the intelligent storage recording system is mainly composed of the FPGA controller, FLASH memory, 12 bit high speed analog to digital converter.
3/29/2020 12:28:18 PM +00:00
This paper points out the deficiency in the current harmonic frequency estimation algorithm in power system. In order to improve the accuracy of detection and reduce the computational complexity, the study combined the ESPRIT algorithm with multistage Wiener filter (MSWF) recurrence to achieve fast estimation of harmonic frequency.
3/29/2020 12:28:11 PM +00:00
The 5G wireless communication system is a new generation mobile communication system beyond 2020. 5GNow is still in the exploration stage. There are some shortcomings in LTE and LTE-A, such as strict synchronism, latency in crowded areas, energy consumption, and challenging in IoT, etc.
3/29/2020 12:28:05 PM +00:00
Z-source inverter takes advantage of a distinctive impedance source network and modulation method of shootthrough vector, and achieves the function of buck/boost DC - AC inverter in the single stage system at the same time, which is suitable for grid-connected PV systems with large input voltage variations.
3/29/2020 12:27:59 PM +00:00
In an active magnetic bearing (AMB) system, the rotor always rotates at extremely high speed which always accompany with huge vibrations and noises. Most of the former researches associated with reducing the rotor vibrations are mainly focused on the control methods of AMB.
3/29/2020 12:27:52 PM +00:00
In this paper, considering the difficulty of widely application of agricultural low power three-phase AC motor because it is not easy to obtain the three-phase power supply, a three-phase AC frequency conversion system under the condition of agricultural 220V single-phase AC power is designed.
3/29/2020 12:27:46 PM +00:00
Transformer is the power equipment of power system core. Intelligent monitoring and operation of transformer can not only monitor the full range of the transformer, the realization of state evaluation, it should be required repair, maintenance required good, but also on the latent fault early diagnosis and prediction.
3/29/2020 12:27:39 PM +00:00
The paper first applies Newton mechanical and physical knowledge to establish shot throwing process mathematical model, calculates throwing performance is related to !,h,F,t0 ,v0 these five factors; the next, it adopts genetic algorithms to solve optimal throwing performance and these five factors best parameters.
3/29/2020 12:27:33 PM +00:00
In order to achieve further development and upgrade, five factors influencing China auto parts industry upgrading are put forward afterwards in this paper.
3/29/2020 12:27:27 PM +00:00
A kind of wireless video transmission intelligence surveillance system is developed to perform work normally done by human being in hazardous environment, narrow space, as well as chemical and toxic places. This system consists of two main parts: a host computer with monitoring software and a mobile intelligent vehicle.
3/29/2020 12:27:21 PM +00:00
This paper presents a general framework for model-based fault detection and accommodation for a class of distributed parameter systems with control actuator faults. A set of dedicated observers, each with its own time-varying threshold is constructed to detect the occurrence of fault in the corresponding actuator and reduce fault detection time.
3/29/2020 12:27:14 PM +00:00