bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design and analysis of permanent magnet biased radial magnetic bearing with external rotor for vacuum tube
Authors: Wang Ying , Mei Lei 
Published: October 2020

Abstract
A permanent magnet biased radial magnetic bearing with external rotor for vacuum tube was introduced, and the configuration and operating principle were analyzed. The parameter design method based on the total magnetic flux was established to deduce the calculation formulas of the parameters of the permanent magnet radial magnetic bearing. The magnetic flux leakage coefficient and the magnetic resistance coefficient were considered, and the calculations were constrained to the degree of magnetic flux density unsaturation of the internal magnetic field of the soft magnetic material. Finite element software was used to execute simulation analysis and modeling of the permanent magnet biased radial magnetic bearing. The results show that the design method is reasonable and efficient, and the design magnetic bearing is compact and easy to control, which is more suitable for the liner motion with low power consumption.
The design of permanent magnet variable-frequency door-motor with one-driver dual control
Authors: Tang Xiaozhou , Ye Jian , Zhang Liping , Yao Yunfeng , Shao Peng 
Published: October 2020

Abstract
Aiming at the scarcity for matched high-end door-motor to domestic high-velocity elevator market, with the research on domestic and overseas elevator door-motor control technology and permanent magnet synchronization technology, a high-end door-motor system that matched with high-velocity elevator and even ultra-high-velocity elevator has been put forward. It introduced in detail about the door-motor control hardware design that used digital chips and intelligent power module as its main circuit, how to realize the door-motor operation curve with SVPWM (Space Vector Pulse Width Modulation), the orientation angle learning method of permanent magnet synchronization motor, how to work in parallel for dual-motor and how to switch the single motor as well as the overall mechanical design scheme. The actual door-motor operation curve has been surveyed through experiment and the operation curve has been analyzed. The research results indicate that the door-motor system can suffice the design requirements input and the design scheme is reasonable and reliable, which will not only significantly shorten the opening and closing time compared to the ordinary door-motor and distinctly improve the service efficiency of high-velocity elevator, but also make the operation curve of the door-motor more graceful, quieter, more stable and safer.
Predictive Control of Five-leg Inverter-Double Permanent Magnet Synchronous Motor System with Error Feedback Model
Authors: Chen Chen , Xiao Xiong , Sun Qianli , Peng Minghua , Wu Jianlei 
Published: October 2020

Abstract
In this paper, the five-leg inverter-dual permanent magnet synchronous motor system is taken as the research object. To solve the problem of large steady-state speed fluctuation when applying the traditional model predictive control strategy, based on the mathematical models of the five-leg inverter and the dual permanent magnet synchronous motor, the causes of the fluctuation are analyzed, and then an improved model predictive control algorithm with error feedback is proposed. The algorithm makes full use of the high-speed operation ability of modern digital processor, and introduces the prediction value of error feedback correction model, so that the rolling optimization is not only based on the model, but also makes full use of the actual value of the feedback state variables. At the same time, the second-order Euler discrete method is used to further improve the model progress. Simulation and experimental results show that the model predictive control strategy with error feedback can effectively improve the steady-state speed control performance of the system while maintaining the dynamic performance of the original system and the decoupling control effect of the two motors.
New generation single-phase charge-control intelligent electric energy meter based on remote interaction
Authors: Bao Jin , Ji Feng , Li Jun , Lu Shufeng 
Published: October 2020

Abstract
The single-phase charge-control smart energy meter adopts the most advanced energy meter ASIC, microprocessor materials, non-volatile memory, permanently stored information, wide-screen LCD and other advanced technologies. A set of high-accuracy, wide-load, high-sensitivity, low-power-consumption, which is used for measuring the rated frequency of single-phase power grid 50 / 60Hz, in AC active energy meters. This single-phase electricity meter integrates multiple functions in one to realize active and active measures for energy to achieve remote real-time voltage, current, neutral current, power, power factor, and the use of remote systems to achieve sales of electricity users Pre-emptive prepayment. It can flexibly set various functions: free electricity consumption, fault alarm, automatic power off, record opening, automatic meter reading.
Research and Design of an Intelligent Charging and Self-checking Car Charging Pile
Authors: Ji Feng , Bao Jin , Li Jun , Lu Shufeng 
Published: October 2020

Abstract
This paper develops an intelligent, efficient, stable and reliable AC charging pile system. In order to achieve the goal of stability and reliability, the power supply uses a high-frequency switching power supply. The topology design must be reasonable. The power components selected can meet the working needs of the high-frequency switching power supply. In order to realize the automatic control function of the charging pile system and achieve the requirements of intelligence, the S3C44BOX embedded microprocessor is designed as the main controller of the charging pile system to realize various functions such as charging control and communication.
Design of lossless snubber circuit for phase-shifted full-bridge converter
Authors: Ji Shengxian , Jie Guisheng , Gao Shan , Wang Hengli , Wang Ruitian , Liu Xiaohu 
Published: October 2020

Abstract
In the phase-shifted full-bridge circuit, the voltage spike caused by the hard turn-off of the switch tube increases the voltage stress of the switching device. Due to the existence of energy-consuming components such as resistance in the traditional absorption circuit, the efficiency is not always high. Based on the RCD snubber circuit, a low-loss absorption circuit is designed in this paper. This circuit absorbs voltage spikes through an absorption capacitor, and then slowly releases energy through an oscillating circuit consisting of current-limiting inductance, stray inductance, and absorption capacitance. The current-limiting inductance reduces the current stress of the blocking diode effectively, which can be achieved with the absorption not being affected and the power loss being reduced. Finally, the absorption effect and energy loss of the new low-loss absorption circuit and the commonly used RCD circuit were simulated and compared in PSpice software, and verified its feasibility.
Research on MPPT technology based on three-stage variable step size disturbance observation method
Authors: Hai Tao , Chen Yongjian , Shi Yu , Li Junjie , Liu Zhenyu 
Published: October 2020

Abstract
For the traditional disturbance observation method, it is impossible to take into account both tracking speed and steady-state accuracy with a fixed step size, so we change the step size and propose disturbance observation method based on three-stage variable step size. The specific method is to set the basic step size and the slope threshold of the P-V curve, and then scale factors according to the interval segment of the slope value of the working point, so as to realize the dynamic adjustment of the step size. Simulation experiments show that after the algorithm is improved, the tracking speed is faster when the environment changes suddenly; when the environment is stable, the power oscillation is reduced. The above has certain positive significance for improving efficiency of the photovoltaic system.
Research on Adaptive Waveform Optimization Design of Anti-jamming Radar
Authors: Zhao Zhixiang , Yuan Jiali , Li Minxing 
Published: October 2020

Abstract
With the rapid development of science and technology, the development of radar in China has entered a new stage, but the signal interference problem is still a bottleneck restricting the accuracy of radar detection. Based on this, this paper conducts waveform optimization design research on radar anti-interference and improved detection accuracy. Firstly, the radar is outlined, then six commonly used radar anti-jamming technologies are introduced. Then the characteristics of modern radar anti-jamming technology are analyzed. Finally, the radar waveform is optimized. Through the waveform design adaptive mechanism and simulation, we find that as the number of adaptive iterations increases, the detection probability of interest targets is increasing.
Research on Superconducting Qubit Manipulation Based on Arbitrary Waveform Generator
Authors: Wu Hengkui , Zhu Weiguo , Pang Jinhao , Cheng Zhen 
Published: October 2020

Abstract
Quantum computing is an emerging technology which will influence the future. Quantum computing is currently limited by the scalability of qubits, especially the qubits manipulation of superconducting computing. In this paper, a superconducting qubits manipulation method based on AWG (Arbitrary Waveform Generator) is proposed. Based on the superconducting quantum computing system, the overall scheme of qubits manipulation is presented, including overall framework, multichannel coherent arbitrary waveform generation design, quantum state reading and acquisition design, multichannel synchronization design and quick feedback transceiver design. The simulation and experiment results show that the proposed method has good scalability, high synchronization index and good signal quality, which can meet the requirements of superconducting quantum computing for qubits manipulation.
An Efficient Method for Prediction of the Flow-induced Vehicle Interior Noise
Authors: Liu Yingjie , Lu Wenbo , Zhang Qi , Wang Xing , Yin Xiang , Hou Hangsheng 
Published: October 2020

Abstract
Wind noise is an important attribute for vehicle interior quietness. To improve the efficiency of wind noise simulation, a method of Stochastic Noise Generation and Radiation (SNGR) is used to rebuild the flow field based on steady simulation result. For wind noise simulation, the flow field result of transient simulation is only applied to low frequency, and the result of the SNGR method is applied to middle and high frequency. Finally, correcting the SNGR result by correction coefficient and combining the two results. The experiment and simulation results have good agreement. The results shows that the hybrid method for predicting the wind noise in vehicle can not only obtain good results, but also improve computational efficiency.
Research on Solve of Heat Transfer Coefficients and Experimental of the Heavy Plate in laminar cooling process
Authors: Wang Junlin , Xie Zhi , Liu Wenhong 
Published: October 2020

Abstract
Heat transfer model is the premise of adjusting cooling control strategy in laminar cooling process. The accuracy of heat transfer coefficient directly affects the accuracy of the temperature model. However the accuracy of heat transfer coefficient is difficult to determine. In this paper, the model of heat transfer coefficient is solved by using chaos particle swarm optimization algorithm. The experimental system was designed and the temperature drop of the points in the plate was measured in laminar cooling process. Compared with the experimental results, the average error of the measurement points is 5.2°C, and the standard uncertainty is 1.4°C. It is proved that the calculation method of heat transfer coefficient is better than empirical formula at the same cooling condition.
Study on the Design of Passive Containment Heat Removal System
Authors: Song Jie , Liu Le , Gong Daxin , Wang Jue , Wang Xiaoxiao 
Published: October 2020

Abstract
The containment is the last barrier to prevent the release of radioactive material into the environment after an accident. If the pressure of the containment vessel exceeds the ultimate carrying capacity of the containment, a large amount of radioactive material leaks into the external environment after the accident. The author designs a set of passive containment cooling system based on sea shipping space constraints. The head period of cold leg double side shear fracture accident of long-term containment thermal response is analyzed in detail. The analysis results show that the loss of coolant accident occurs within 72h, the passive containment cooling system can ensure the safety of pressure, which meets the design requirements.
Research on Application of Mathematical Model in Cost Fuzzy Control
Authors: Liu Shuju 
Published: October 2020

Abstract
The main goal of mathematical modeling is to deal with the problems of economic and ecological environment, daily life, etc., and to extract real problems and abstract them into mathematical models, and then to obtain the solution of the model, verify the scientificity of the model, and use the answers obtained by this model. Explain real problems. Through a series of related studies, this article guides the internal work of many real-world organizations, such as saving costs, reducing wood, and improving economic efficiency.
RETRACTED: Research and Implementation of The Fault Information System FOR Relay Protection Based on Cloud Computing Technology
Authors: Wang Junlong , Wang Lei , Dong Guowei , Yuan Zehong , Zhang Jinsong , Wu Xiaojie 
Published: October 2020

Abstract
With the continuous development of smart grid technology, it is of great engineering application value and urgent practical demand to collect and manage more intelligently the operation and fault information of relay protection in 110kV and below substation. With the introduction of “cloud computing” technology, a cloud platform of fault information with good expansibility, high stability, loose coupling, strong reusability and convenient maintenance could be built up, which is the core of the system construction. In order to make full use of the existing data network channels and network resources in 110kV substation, a fault information system of relay protection, with its sub-station modeling and communication management, is presented based on “cloud computing” technology to realize a more efficient and convenient relay protection exchange between 110kV substation and the dispatching control center.
Application of Ant Colony Algorithm to Air Route Planning in Helicopter Submarine Searching
Authors: Li Lin , Zhou Zhiying , Han Qiang , Yu Jie , Lv Xinyi , Bi Simin 
Published: October 2020

Abstract
Air route planning system is the core of antisubmarine call-search mission which is carried out by an ASW helicopter, and the efficiency of mission completion is decided by the algorithm adopted. Considering actual army training and combat, this paper analyses the basic elements of responding-antisubmarine air route planning system systematically, constitutes assessment index of air route planning system, presents the constraint conditions which should be considered by the system and carries out simulation calculation by ant colony algorithm. Finally, this paper summarizes the applicable circumstances of responding-antisubmarine air route planning methods based on ant colony algorithm, which will be of great value to improve army combat and training efficiency.
A Modified RR-ALOHA Protocol for Safety Message Broadcast in VANETs
Authors: Huang Zhong , Xu Rui , Chu Chu , Wen Guangjun 
Published: October 2020

Abstract
MAC protocol design of VANETs is a real challenging task due to the high mobility and mobile hidden terminals (MHTs) issues. Slotted ALOHA based MAC protocols is regarded as one of the most promising solution in which hidden terminals issues are solved by broadcasting frame information (FI). However, when network topology changes rapidly, the vehicles using the same slot comes close to each other, merging collisions take place and a new round of slot reservation is required. This paper proposes a modified Reliable Reserved ALOHA (RR-ALOHA) protocol in which merging collisions are detected and an election process is employed to reduce collisions directly after one merging collision. Simulation results show that our proposal achieves better packet delivery ratio than RR-ALOHA in most scenarios.
Control strategy of doubly-fed induction wind turbine
Authors: Yao Zenghui 
Published: October 2020

Abstract
Based on the principles of DFIG, this paper establishes a DFIG model in a synchronously rotating dq coordinate system. For the grid-side control system, the vector control technology facing the grid voltage is used to realize the decoupling of DFIG active power and reactive power. The methods of feedforward compensation and PI control are used to control the rotor side of the DFIG. When the voltage drops above the low voltage ride-through operating standard curve, DFIG should not leave the grid. When the grid voltage drops below 0.9 times the standard unit value, DFIG should also provide reactive power to the grid to support the grid voltage. Since the reactive power that can be provided by the stator side is much greater than the reactive power on the rotor side, when the grid voltage drop is small, the stator side first provides reactive power to the grid. When the grid voltage drops more, the stator side and the rotor side share power to the grid to provide reactive power. Finally, using MATLAB/Simulink software to simulate DFIG, verify the effectiveness of the control strategy proposed in this paper, and lay a foundation for fault characteristic analysis.
Application of Extreme Value of Nonlinear Regression Function Based on RSI Expert System
Authors: Zhang Shaohe , Liu Hui , Xiao Zongna , Wang Pin 
Published: October 2020

Abstract
This paper defines the waveform function and its corresponding concepts and axioms. The extreme value of stock price function is obtained from 24 known regression functions by using the method of seeking the extreme value, which is proven by the Shanghai stock index rising by 458.43%, 487.83% and 133.30% respectively in three different periods. This paper optimizes the expert RSI trading system with the method of mathematical extreme value, and writes the source code of the optimization formula, which provides a graphical and intuitive tool for investors. The average annual return, average winning rate and average net interest rate of waveform increasing function samples are 67.52%, 96.88% and 84.40%, respectively. The average annual return, average winning rate and average net interest rate of waveform decreasing function samples are 22.27%, 83.33% and 26.03%, respectively.
The Application of Lagrange Relaxation on Taxi Dispatchments During Evening Rush Hours
Authors: Qu Huijie , Zhao Zhi 
Published: October 2020

Abstract
The city transportation status is directly related to the taxi supply arrangements during evening rush hours. The operation times, operation nature, operation requirements, vehicle resource types and quantities will have big influence on taxi drivers’ dispatchments, it is comparatively difficult to dispatch reasonably. This paper uses Lagrange Relaxation to solve the problem of taxi supply and demand during evening rush hours. NP-Hardness is the difficult point of dispatchments, thus Lagrange method is used to result an optimal solution on taxi dispatchments within reasonable calculating time, while the bottom limits of the approximate optimal solution and the approximate solution are resulted as well. This method can effectively solve the problem of the balance of taxi supply and demand during evening rush hours. Based on this, the dual problem is solved by using incremental subgradient method, while an improved strategy is proposed to rise the convergence rate.
Comprehensive Evaluation and its Application in Mathematical Modeling
Authors: Duan Luling , Ling Zhonghua 
Published: October 2020

Abstract
This paper first introduces the comprehensive evaluation and its purpose, five elements of comprehensive evaluation, and gives the establishment methods of the comprehensive evaluation model, including linear weighting method, nonlinear weighting method and approximate ideal point method. Secondly, the general steps of comprehensive evaluation are summarized, and the treatment methods of evaluation indexes are given: using minimizing – maximizing, centering – maximizing and interval - maximizing to achieve the consistency of index types; using vector normalization, extreme difference transformation, standard sample transformation and linear proportional transformation to standardize index types; using expert consultation and relative comparison to determine the weight of index. Finally, a comprehensive evaluation model of aircraft type is established.
Study on the application of elementary number theory in conflict algorithm
Authors: Zhao Zhi , Huang Jinde 
Published: October 2020

Abstract
Analyze the time complexity of the algorithm, for multiple threads to execute multiple transactions at the same time, and map the result of the remainder of the prime number to the hash address. After calculation, the formula is a convergent array. The larger the value of x, the smaller the calculated value, indicating that the algorithm can complete the task in a certain limited time. Applying the probability of random prime numbers to the design of conflict management algorithms can avoid endless waiting for each other between transactions, and also avoid the waste of computing resources caused by cancelling earlier transactions. Compared with the radical algorithm of direct termination, this algorithm gives the transaction a certain waiting and retry time, avoids the long execution of the long transaction, and guarantees the commit time of the transaction.
The Propositions and Proofs in Algebra System
Authors: Chen Shiqing 
Published: October 2020

Abstract
In the study, it was proved that the algebra system

(
a
+
b
p
,
⊕
,
⊙
)

=

{
a
+
b

2

|
a
,
b
∈
Z
}

is a Ring of integers and not a domain, and when

2

is extended to the prime number, the conclusion is correct. When a and b are Rational number and Real number, it proves that Algebra System

(
a
+
b
p
,
⊕
,
⊙
)

=

{
a
+
b

2

|
a
,
b
∈
Z
}

is a domain and extends

2

to

5

until p is the prime number. The conclusion is correct. Finally, the judgment method of Subdomains is used to prove that when a and b are plural, I = {a + bi|a, b ∈ Q}is a domain.
Application of Multiple Regression in Mathematical Model of Air Quality Calibration
Authors: Que Xiaohua , Li Hong 
Published: October 2020

Abstract
Based on the existing self-built point data, state-controlled point data and wind speed, pressure, precipitation, temperature, humidity and other data, a multivariate regression mathematical model is established in this paper to optimize the self-built point data. The model is optimized via data to find out the factors that have great influence on the data of self-built points and get more accurate regression equation model. After verification, it can be seen that the calibration degree of the model to the self-built point data is high.