bluuebunny/crossref_metadata_2025 huggingface dataset:
An Improved Method Using SINS/PPP Method for Land Vehicle Gravimetry
Authors: Yu R H , Wang L , Cao J L , Cai S K , Wu M P , Xu X
Published: June 2020

Differential GNSS has been successfully applied in the SINS/GNSS vehicle gravity measurement method over the past few decades. However, GNSS error source has the spatio-temporal correlation in the differential mode. The navigation resource utilization efficiency is degraded due to the limitation of the baseline distance and the satellite common view. Using only one satellite receiver with high precision satellite orbit parameters and clock parameters, establishing navigation error models and parameter estimation methods, and obtaining high-precision receiver dynamic positioning, Precise Point Positioning (PPP) is a promising non-differential mode GNSS technique. The advantages of PPP are that it is simple to operate, low in cost, and not limited by the requirements for establishing a base station. This paper presents an SINS/PPP method for land vehicle gravimetry. Based on the strapdown gravimeter SGA-WZ02 developed by the National University of Defense Technology (NUDT), a land vehicle gravimetry test was carried out on a road about 36 kilometres long. The test consists of four measuring lines back and forth in the north-south direction with an average speed of 40km/h. Using this method, the internal accuracy of four repeated lines is 0.52mGal/0.9km. Compared with the results obtained by traditional SINS/GNSS method, the internal accuracy is 0.51mGal/0.9km, which shows that the accuracy calculated by SINS/PPP method is comparable to the results calculated by SINS/DGNSS method. Practical gravimetry results indicate that the proposed SINS/PPP method in this paper can meet the requirements of vehicle gravimetry under ideal GNSS observation conditions, and the feasibility of PPP technology for vehicle gravimetry is verified. Finally, some discussions and suggestions about the applicability of the method and its further improvement are put forward.
Speed sensorless of induction motor with adaptive full order state observer
Authors: Yu Xiangqian , Zhang Chi , Su Tao
Published: June 2020

Speed sensorless vector control of induction motor not only maintains the excellent performance of vector control, but also overcome the disadvantage of speed sensorless. It can reduce the cost and improve the reliability. So speed sensorless control have been widely researched. The paper implement speed sensorless control by the adaptive full order state observer and give debug process. Experiment results shows that this approach have excellent performance.
Investigation of Three-Level ANPC IGCT Converter for Industrial Medium-Voltage Drives
Authors: Zhang Jingxuan
Published: June 2020

High-power three-level neutral-point-clamped (NPC) integrated gate commutated thyristor (IGCT) voltage-source converters have been widely used in industry applications. The novel three-level active neutral-point-clamped (ANPC) IGCT voltage-source converters can provide three additional switch states compared to the the NPC counterparts. Thus, the ANPC converter can increase the rated power compared to NPC. In this paper, the switching states of the three-level ANPC IGCT voltage-source converters are illustrated. The commutations and power loss distribution of the IGCT devices are investigated. The strategy is implemented on a high power three-level ANPC voltage-source converter equipped with 4.5kV/4kA IGCT devices. The experimental results prove that the three-level ANPC voltage-source converter has higher power density compared to the conventional NPC counterparts.
Simulation Analysis of Static Characteristics of Electromagnetic Mechanism of Magnetic Holding Relay Based on ANSYS
Authors: Fan Xingming , Zheng Yuxin , Zhang Xin
Published: June 2020

As an important part of the magnetic latching relay, the design of its parameters will directly affect the static characteristics of the entire system. This article first explains the working principle of the magnetic latching relay and the electromagnetic field analysis theory. Based on this, a simplified model of the electromagnetic mechanism is established. The ANSYS finite element analysis software is used to simulate and analyze the electromagnetic mechanism. The electromagnetic generated by the electromagnetic mechanism under different parameters is obtained. The magnitude of the force and its magnetic induction intensity distribution cloud map provide a useful reference for the performance optimization of the magnetic holding relay and subsequent related research.
Research on electromagnetic interference protection of vacuum tank temperature acquisition system
Authors: Shichao Guo , Dandan Guo , Qiongyu Zhang , Nankai Wu , Jiaxin Deng
Published: June 2020

Solving the electromagnetic interference problem of the vacuum tank temperature acquisition system has an important role in improving its field reliability. The interference coupling path is found by simulating the source of electromagnetic interference in the environment, and the component characteristics are analyzed. The problem of electromagnetic interference by improving its own anti-interference ability was solved, and a solution for verification was proposed again.
Research on Electromagnetic Environment Situation Display of Digital Map Radar based on 3D GIS
Authors: Shichao Guo , Dandan Guo , Qiongyu Zhang , Nankai Wu , Jiaxin Deng
Published: June 2020

In order to meet the requirements of electronic countermeasure application, the visualization analysis method of information electromagnetic environment was studied. The elements of data operation parameters of electromagnetic environment were put forward, and a comprehensive display system of electromagnetic environment information was developed. Then the dynamic display of radar detection range in complex electromagnetic environment based on GIS was completed.
Experimental Study of Flood Gun
Authors: Chenhui Deng , yan Wang , Junbiao Liu , Li Han
Published: June 2020

Using the flood gun is a common and effective way to eliminate the charge buildup, which is mainly used in electron optics based devices such as CD-SEM, X-Ray Photoelectron Spectroscopy (XPS), Auger Electron Spectroscopy (AES), Secondary Ion Mass Spectrometry (SIMS), Electron Probe Micro Analysis (EPMA) and Ion Implanter. The characteristics of the beam play a decisive role in eliminating the effect of charge buildup, which directly determines the effect of using the related equipment. It is difficult to measure accurately and comprehensively the performance of the beam by using the current testing methods for the flood gun. In this paper, a method for measuring beam spot by using a Faraday cup aperture is proposed, and a test system is set up based on this method. Experiments on this test system have successfully achieved accurate and comprehensive measurement of the beam spot performance. The in-depth analysis of the beam spot performance has a guiding significance for the optimization of structural design and installation of the flood gun. At the same time, it contributes to the prediction of the experiment.
An improved support vector machine classifier based on artificial bee colony algorithm
Authors: Cao Yongcun , Ji Saisai , Lu Yong
Published: June 2020

Support vector machine (SVM) has unique advantages in the classification of small sample data. The selection of parameters has an important impact on the classification accuracy and generalization ability of SVM. Since the selection of parameters of SVM is usually based on experience, an improved SVM classification model based on artificial bee colony algorithm (GOABC-SVM) is proposed in this paper. In this model, firstly, the traditional artificial bee colony algorithm is optimized using the ideas of global optimal solution guidance and opposite learning. Secondly, we set the reciprocal of classification error rate as the fitness function, and use the improved artificial bee colony algorithm to obtain the optimal parameter combination of SVM. Experiments on a set of datasets of UCI show that the proposed model has higher classification accuracy and better generalization ability.
Microwave Photonic Phase Shifter with frequency up-/down-conversion
Authors: Chen Dou , Ma Jianxin
Published: June 2020

In this paper, we propose a microwave photonic phase shifter with frequency conversion (MPSFC) without optically filtering to realize both frequency up- and down-conversion and a full 360º phase-shift for the microwave signal based on an integrated dual-polarization dual-parallel Mach-Zehnder modulator (DP-DPMZM). As the radio frequency (RF) signal is frequency down-converted to intermediate frequency (IF) signal or the IF signal can be frequency up-converted to RF signal, the phase of the output IF or RF signals can be shifted by adjusting the DC bias voltage of PolM. Simulation results demonstrate that both 360º continuously tunable phase shift and frequency conversion can be implemented simultaneously.
Robust correlation filter that combined temporal regularization with spatial weight L1 constraint
Authors: He Xin , Duan Shukai , Wang Lidan
Published: June 2020

The parameter optimization of the Object tracking algorithms has achieved excellent performance based on parameter regularization. Adaptive spatial regularization correlation filter can obtain the optimal weight coefficient for a specific target. Inspired by this, we propose a filter combined temporal regularity with spatial L1 regularization (LTASRCF). The time regularizer is used to remember the data of the previous frame to update the current target position. It performs well in the process of occlusion, deformation and motion blur. Meanwhile, L1 regularization of spatial weights reduces the computational complexity of the coefficients, and improves the robustness of the spatial weight matrix. We have conducted comparative experiments on the OTB-2015 dataset, and the proposed LTASRCF model ranks first among the five popular algorithms, which outperforms by 9.2% and 18.9% than KCF, respectively, and reaches real-time performance.
Feasibility Analysis and Protection Measures of Live Working on the multi-circuit Transmission Lines on the Same Tower
Authors: Zhenyu Ma , Chao Chen , Leijiao Ge , Binbin Wen , Jinhui Zhou , Ziling Wang
Published: June 2020

Live line operation is the most direct and effective means for the maintenance of multi-circuit transmission lines on the same tower. It is also a special operation mode developed to improve the reliability of power supply and the safety of power grid. Therefore, it is necessary to analyze the feasibility of live line operation of multi-circuit transmission lines on the same tower. In this paper, 110 kV, 220 kV and 500 kV multi-circuit transmission lines on the same tower are taken as object, and the safety analysis of live working is carried out for typical working positions. According to the results of operation impact discharge test, the risk rate and safe working distance of live working are obtained; Finally, the minimum effective insulation length of load-bearing tools and operation tools is calculated.
Improved ip-iq Reactive Current Detection Method Without PLL
Authors: Zhao Qian , Liu Shulin
Published: June 2020

As the traditional d-q transformation method is not sufficient in detecting the three-phase asymmetric components, a new detection method in which a single phase voltage is input to a differentiator to get an orthogonal differential is proposed. The synchronous rotary angle can be obtained by using the orthogonality relationship based on mathematical relationship. The new detection method is suitable for both asymmetric load and asymmetric supply voltage systems. The effect of time delay caused by phase-locked loop (PLL) is eliminated without using PLL circuit to obtain synchronous rotation angle in the detection process. The phase shifting deviation is solved without shifting the phase of three-phase current. The unbalance degree of input voltage in Static Synchronous Compensator (STATCOM) is effectively reduced by using this method. Simulation and experiment results show that the proposed method is valid and feasible.
Research on Simulation Training System for Substation Equipment Maintenance
Authors: Wu Yichun , Fang Xuelei , Men Fuyuan , Qin Xiaojia , Zhou Lei
Published: June 2020

Substation equipment is the core component of substation. The occupational skill level of the operation and maintenance personnel is directly related to the safe and stable operation of power grid. Obviously the training for substation equipment maintenance is essential. Virtual simulation training platform for substation equipment maintenance is an effective tool to improve the practical skills of maintenance personnel. Therefore, a realization scheme of the substation equipment maintenance simulation training system is mainly researched in this paper. By configuring maintenance tasks and equipment defects, the automatic generation of equipment maintenance virtual operation scenes and three-dimensional equipment models can be realized in the training system, thereby accomplishing flexible configuration of training tasks. Besides, trainees can be evaluated via the establishment of the maintenance evaluation model. In the actual training application, the equipment patrol and inspection as well as the maintenance process are simulated in the virtual substation scene, which can effectively improve the maintenance skill training effect.
Modal Analysis of Three-dimensional Model of Turbogenerator Stator End Windings
Authors: Liu Yiling , Bao Xiaohan , Li Xinghong
Published: June 2020

Concerning the structural complexity of large-scale turbogenerator stator, this research aims at establishing the windings model of the large-scale turbogenerator stator ends by using ANSYS, including the ends of upper and lower condutor bars, spacer blocks between adjacent condutor bars, and inter-layer rings between the upper and lower condutor bars. Moreover, the modal analysis of the stator end windings was performed with the help of ANSYS, and the parameterized finite element analysis was further conducted on the space blocks that may affect the overall structural mode and natural frequency of the ends, and the influence trend of the space blocks on the natural frequency of the elliptical mode was obtained. It provides a reference for the design of the generator end structure and its improvement, and also provides a basis for the subsequent research on the electromagnetic vibration of the end windings and the stator windings.
Energy model of pumped hydro storage station
Authors: Li Huafeng , Guo Zhizhong , Ding Zhe
Published: June 2020

In order to meet the design and operation requirements of uncertain renewable energy accommodation in power grid, this paper establishes the energy model of pumped hydro storage station, including energy water head, energy storage and the relationship of conversion between power and energy. The energy water head which directly describes the potential energy of water storage of upper reservoir is different from the conventional water head; the change of supply water storage has obvious influence on the energy water head, and the conservation of the energy water head increment describes the influence of the change of supply water storage on energy water head; energy storage is determined by the water storage of upper reservoir and the energy water head; energy storage capacity is determined by the power generation storage capacity and the rated energy water head; the sensitivity analysis shows that the change of the water storage of upper reservoir is the main cause of the energy storage change. The concept and construction method of the storage function are put forward to calculate the energy storage situation quickly.
Impact of Wind Power and Photovoltaic Grid Connection on Subsynchronous Oscillation of Thermal Power
Authors: Dai Chen , Xu Tao
Published: June 2020

Wind power, photovoltaic and thermal power bundling are the main forms of large-scale new energy grid connection and power transmission. Based on the IEEE’s first standard model, this paper incorporates direct-drive fans and photovoltaic systems. The transform method analyzes the effect of direct-drive wind turbines and photovoltaic grid-connected power on sub-synchronous oscillation of thermal power. Simulation results show that appropriately increasing the photovoltaic grid-connected capacity can increase the electrical damping of thermal power in the wind, solar and fire delivery system.
Research on the Strategy of Failure Recovery in Smart Grid
Authors: Ma Cong , Guo Jiyuan , Liu Jian , Ren Yu
Published: June 2020

With the development of China’s comprehensive construction and the upgrading of industrial system, China began to transform from energy-consuming and high-pollution society to energy-saving and environment-friendly society. Knowledge-intensive and equipment-intensive industries are on the increase, which causes the increasing demand for the stability of electricity supply. At present, the problem of transmission over distribution still exists in the power grid construction of China. In power systems over 110 k V, the strategy of non-homologous dual power supply is adopted to guarantee power supply. When a circuit trip occurs, the spare line can be used to continue the power supply, so the existing domestic main network system has a high reliability. The main function of the distribution network system is to connect the user and the main network, which is an important link of power transmission. In the future of the development of intelligent power network, the original parts such as mobile voltage transformer and current transformer can be used to locate the fault position after the physical fault occurs in the distribution network, and automatic reclosing device can be used for fault isolation and fault recovery. How to use the optimal strategy to make the controllable automatic reclosing device be used for switching operation after the physical failure of the distribution network so as to ensure the reliable power supply of the distribution network, has become the focus of power network hoisting service.
Reinforcement Learning-Based Interference Avoidance in Cognitive Radio Networks
Authors: Chen Jinhua , Zhang Luyong , Wang Ao
Published: June 2020

Cognitive radio is an important technology developed by the next generation of wireless networks to effectively use limited spectrum resources and meet the rapidly growing demand for wireless applications and services. However, reliability is very important but not well-resolved problem in cognitive wireless networks. In this paper, we focus on the algorithm of interference avoidance in the presence of secondary user with traditional power control capabilities. Using the reinforcement learning algorithm based on proximal policy optimization, and adjusting its own transmit power, secondary user achieves its own quality of service requirements. Through experiments, it is proved that the algorithm used in this paper can not only deal with different secondary user power control strategies, but also show good stability in the changes of wireless environment noise and small amount data of the environment.
Research on Islanding Strategy for Fault Recovery of Distribution System with Micro-grid
Authors: Ma Cong , Zhang Shuai , Guo Jiyuan , Ren Yu
Published: June 2020

In order to adapt to the actual situation of power distribution system fault recovery with micro-grid, a recovery strategy for micro-grid to operate on island with important system load at first under fault conditions is hereby studied. Due to the weak overload capacity, large fluctuation and obvious influence of weather and time period of renewable energy in micro-grid, the dynamic changes of distribution generation and loads in non-fault power loss areas should be considered as much as possible when generating islands. According to historical data, the daily random fitting functions of photovoltaic power generation, fans and various loads are respectively generated by using respective optimization models. For judging the start and duration of the fault, using the fitting function to set the fitting power value of each unit in the distribution system and other information, and calculating the dynamic importance information of each load node as the heuristic condition for subsequent island search. The search strategy in this paper is to guide the load added to the island according to the dynamic importance of the load, and to analyze the reliability of island operation. This method controls the direction of island search, and gives priority to ensuring the recovery of important loads. At the same time, it can ensure the balance between the stability of island generation and the maximum utilization of renewable energy.
A low-voltage with high pumping efficiency charge pump for flash memory
Authors: Xie Yu , Huang Shengming , Xue Yuming , Duan Quanzhen
Published: June 2020

This paper proposed a high efficiency of power conversion and high pumping gain charge pump applied to the field of low power consumption like flash memory. The threshold voltage drop, body effect and the undesired charge transfer are three significant factors limiting the pumping gain and power conversion efficiency. In order to solve the threshold voltage drop and body effect, the charge transfer switches (CTS) are utilized in the proposed charge pump. What’s more, an optimized substrate control strategy and body-source diode are applied to eliminate undesired charge transfer for improving power efficiency. And a complementary branch scheme is employed to reduce the output voltage ripple. The proposed charge pump is implemented in SMIC 0.18 um standard technology and the simulation results indicate better performance and high efficiency of power conversion. The proposed charge pump satisfies the relevant specifications of the charge pump applied to flash memory.
Multi-objective Distribution Network Reconfiguration Optimization Considering Space Allocation of Electric Vehicles
Authors: Yanhui Tao , Weijia Yue
Published: June 2020

This paper explores the space allocation method and fuzzy C cluster processing method of electric vehicles, establishes a multi-objective distribution network model, solves the calculation process of the model, and verifies the feasibility of this research through simulation analysis method, thus providing help for orderly charging of electric vehicles and reducing line loss.
Research on Intelligent Shift Control Strategy of The Loader Based on Radial Basis Function Neural Network
Authors: Wu Guanghua , Ma Wenxing , You Lipeng
Published: June 2020

One of the key issue of the automatic shift control of the loader is how to find the best gear for the current conditions according to certain mapping relation, but this complex and non-linear mapping is difficult to express by mathematical relation. However, to solve such non-linear problems, RBF neural network is the very choice. This paper presents an RBF neural network intelligent shift control strategy method based on improved genetic algorithm. The genetic algorithm’s global search ability is improved by adaptively adjusting the crossover probability and mutation probability. The genetic algorithm is used to optimize the RBF neural network expansion coefficient and reduce the tediousness of adjusting parameters during the network learning process. The feasibility of this method was validated by the bench test of the intelligent shift test system for loader automatic shift control. The theory was provided for the development of intelligent automatic shift control for construction machinery. The basis has high engineering application value.
Design of Simulation Test Platform for Charging Pile Control System
Authors: Li Guojian , Ding Libo
Published: June 2020

A fully functional, safe and stable electric vehicle charging pile is a necessary condition to ensure the widespread promotion of electric vehicles. At present, due to lack of testing methods, a large number of charging pile manufacturers have not performed a systematic test on their charging piles before leaving the factory. These defects make the real availability of charging piles put into operation in the market very low, and it is difficult to meet the charging needs of a large number of charged cars. To solve this problem, this research chooses to develop a simulation testing platform for charging pile control system based on semi-physical simulation technology.
Adaptive speed control of PMSM for energy storage process of MEES
Authors: Zheng Xiaoming , Zhang Jianwei , Deng Jiaojiao , Zheng Yuming , Wang Peng
Published: June 2020

Mechanical elastic energy storage (MEES) system completes the energy storage process through permanent magnet synchronous motor (PMSM) rotates and tightens the energy storage boxes which contains large spiral torsion springs (STSs) to convert electrical energy into elastic potential energy. The torque of the storage box is gradually increased while the moment of inertia is gradually reduced in the process of energy storage. Thus, this paper proposed an backstepping control scheme with torque and inertia adaptive law and the stability was proved in the sense of Lyapunov theory. The effectiveness of the proposed scheme was verified through hardware experiments. The results indicated that the proposed scheme ensures the speed to track the given value rapidly and the energy storage process can be carried out smoothly.
Linear Feedback Control of Chaotic Motion in Gear Transmission System
Authors: Wang Junguo , Yao Zhaoyuan , Sun Rui , Haseen M. F.
Published: June 2020

Considering the internal and external excitations such as backlash, time-varying mesh stiffness (TVMS), transmission error and friction force, a lumped mass model of the spur gear system is established. On this basis, the influences of the support stiffness on dynamic response including bifurcation diagrams, time response diagrams, amplitude-frequency spectrums, phase plane diagrams, Poincaré maps are examined by using numerical method. To avoid the system moving in the unstable region, a linear feedback control method (LFCM) in the gear system is realized. Numerical simulations show that the LFCM is effective and feasible, hence the gear system can be controlled from chaotic motion to stable periodic orbits by using the appropriate control parameter.
Research on Motion Control of the 2-DOF Packing Robot
Authors: Wang Peng , Yu Liang , Miao Lei , Zhang Long
Published: June 2020

Under the strategic background of “made in China 2025”, industrial robots are more and more widely used in the automatic production process. In this paper, the motion control system of the bearing packing robot is studied. The hardware of the system is mainly Delta PCI-DMC-B01 12 axis motion control card based on computer PCI bus, which is connected through DMCNET network and sends control instructions to the two axis servo driver of the robot. The system software is written in LabVIEW environment, including trajectory generation and transmission, zero calibration of robot mechanism, robot teaching, motion parameter setting and other functional modules. Taking the zero calibration function test of robot as an example, the union test of the control system is carried out. The results show that the hardware and software system can work coordinately. The zero calibration experiment provides the basis for the development of other motion control functions and lays the foundation for the application in production.
Dynamic Analysis of sprint burst based on coupled Fuzzy Control
Authors: Tao Wu
Published: June 2020

The dynamic analysis of sprint burst based on coupled fuzzy control is studied. through theoretical analysis and computer vision simulation, the detailed data are obtained and applied to sprint training. Computer simulation technology is used under the computer vision simulation platform, the dynamic model of sprint burst movement is analyzed, and the dynamic mathematical model of sprint explosive force joint is constructed. The limb mechanical characteristic parameters under sprint burst action are obtained. Based on the coupling control method, the characteristic analysis and information parameter estimation of sprint burst dynamics are carried out. The sprint starting model and sprint model are constructed respectively. The mathematical modeling and lower extremity mechanical analysis of two sprint burst motion modes are carried out. The torque of bone and joint is calculated, and the theoretical calculation value and simulation value are obtained. Finally, the visual simulation of sprint burst mechanics is carried out with ADAMS software, and the simulation values and theoretical values of the characteristic parameters of sprint burst dynamics are obtained, and the comparative analysis is realized. Through the simulation results, the optimal power model control under sprint burst mode can be realized. The research results will provide effective theoretical guidance for sprint training, optimize the training methods and improve the training effect.
H
∞ Loop Shaping Robust Control for Body Roll of Tractor-semitrailer on Ice-Snow Road
Authors: Sheng Chang , Bingtao Li , Xianchao Zhu
Published: June 2020

In view of the problems that the poor driving stability and the increase body rolling even instability of the tractor-semitrailer in turns with a middle-speed on the ice-snow road, a robust stably controller that uses a combination method of H
∞ and loop shaping is designed. The tractor-semitrailer dynamics model with the body roll degree of freedom is been established, and the influence of different ice-snow road adhesion coefficients on the dynamic characteristics of body rolling angle is analyzed. Finally, the simulation verification carries out that the controller which is used H
∞ loop shaping can make the body roll of tractor-semitrailer stable, and the controller has a good robust stability.
Research on Industrial Control Technology of Hydraulic Stability of Condensing Unit on Ethanol Distillation Tower
Authors: Gong Kun , Song Chuancheng , Bu Jiahui , Ma Cheng
Published: June 2020

Aiming at the problem that the hydraulic pressure of the condensing control device at the top of the ethanol rectification tower is unstable, which affects the efficiency of chemical production, a strategy for controlling the hydraulic stability by controlling the nozzle opening time is proposed. Firstly, the functional relationship between elastic modulus and pressure is obtained by polynomial interpolation fitting. Then, based on the Navier-Strokes fluid theory, the differential equation of density of the condensate and the continuous equation of flow are obtained. From the static and dynamic perspectives, the goal planning based on the concept of least squares is traversed to obtain the optimal check valve opening time. A simulation experiment with a standard value of 100 MPa was used to obtain the optimal solution of 0.308 ms, and a comparison experiment was performed to verify the accuracy and rationality of the solution.
Fuel system control design based on mass conservation
Authors: Zhong Zhenfang
Published: June 2020

Fuel entering and ejecting high-pressure fuel pipe is the basis of fuel engine operation. The intermittent operation of high-pressure oil pump and injector will lead to the change of pressure in high-pressure oil pipe. This paper studies the influence of the opening and closing of one-way value and the speed of cam angle on the pressure in high-pressure oil pipe. Because the fuel flow is unstable in the high-pressure fuel pipe, it is necessary to determine the influence of pressure change on fuel density, and then calculate the mass of fuel supply and fuel injection in unit time. Considering the principle of mass conservation, the problem can be transformed into the length of single opening time of one-way valve when the mass of fuel entering and leaving the high-pressure oil pipe is equal in unit time interval. At the same time, by deducing the influence of the single opening time of the one-way value on the pressure in the high-pressure oil pipe, the single opening time of the one-way valve when the pressure of the high-pressure oil pipe reaches equilibrium after 2s, 5s and 10s is 0.610895ms, 0.425998ms and 0.373376ms respectively. Consider the working principle of the fuel system on the basis of the above considerations. Fit the function relationship between the needle lift and working time, deduce the change rule of flow volume of injector with time, and calculate the volume and mass of fuel injected by the injector in the working cycle. The results show that the high-pressure oil pump supplies oil 94 times in a working cycle of the injector, and the time required for the cam to rotate for one circle is 1.064ms, and the angular velocity of the cam is 5.906rad/ms. In this paper, based on the theory of unsteady liquid motion, mass conservation and energy conservation of fluid mechanics, many elements involved in the problem stem are analysed and related, and the control model of one-way valve switch and cam angular velocity is given.
Research on access control method of Digital Archives based on blockchain
Authors: Men Rui
Published: June 2020

This paper analyzes the security problems that need to be solved urgently in digital archives system: First, the centralized storage of digital archives makes it overwhelmingly dependent on the third-party storage organization. Second, every transaction has its own access proof and its own authorization proof, it’s not transparent to others. Then the blockchain technology is introduced to solve the existing problems. We store the digital file attachment and file attributes in the private IPFS cluster after encryption. The address of IPFS and digital fingerprint of the file are stored on the private blockchain. Additionally, this paper stores and checks the height and hash value of the latest irreversible block of the private blockchain, to guarantee the authenticity of data on private blockchain. To solve the second problem, we store the ABAC on public blockchain, add time and position information to the attributes of the subject, to achieve fine-grained access control. Finally, this model is implemented on fabric1.0.3.
Research on Dual Loop Control Strategy of Dynamic Wireless Charging for Electric Vehicle
Authors: Fan Xingming , Zhang Weijie , Zhang Xin
Published: June 2020

This paper focuses on a dynamic wireless charging method of electric vehicles with segmented structure, which uses multiple transmitting coils at the transmitting end to realize wireless power supply for electric vehicles in motion. Based on the structure of the dynamic wireless charging system of the electric vehicle with magnetic coupling resonance, the system is modeled and analyzed by using the equivalent circuit theory, and a control strategy of the transmitting end is proposed, which can effectively solve the problem of coil deviation and dynamic characteristics when the receiving coil and the transmitting coil of the electric vehicle are in the charging process. A double loop controller is designed to adjust the power and current of the transmitting end, which allows the sequence and timely activation of the segmented transmitting coil. Under the condition of no-load and load, the current of the transmitting coil is controlled at the reference value to compensate the power transmission reduction caused by the lateral misalignment of the vehicle and prevent the overload at one time. The system is modeled and analyzed with Simulink software, and the feasibility of the control method is determined.
Network Intrusion Monitoring Technology Based on Decision Tree Method
Authors: Liu Xinyu
Published: June 2020

In order to solve the problem of poor real-time network security intrusion detection, this paper proposes a network intrusion monitoring technology based on decision tree method. Firstly, the network intrusion monitoring module is set up in the existing network topology model, then the network information collection, information processing and information analysis modules are combined. Finally, the decision tree method is used to identify the abnormal data, effectively realize different types of abnormal data monitoring, and finally realize the network intrusion monitoring. Experimental results show that the proposed intrusion monitoring method can better monitor network intrusion behavior, and has higher monitoring accuracy than other methods.
A Data Fusion Framework of Multi-Source Heterogeneous Network Security Situational Awareness Based on Attack Pattern
Authors: Yao Yuangang , Sun Yanwei , Liu Zhaohui , Meng Xiangjie , Liu Zhaohui
Published: June 2020

In the context of the era of big data, how to quickly and accurately detect attack events from massive amounts of heterogeneous data and form effective response on time has become the main challenge facing network security today. This paper systematically summarizes the attack behavior with both attack technology mechanisms and characteristics of the attack target, thereby constructing a scalable attack behavior model. Based on the attack behavior model, a data fusion framework of the multi-source heterogeneous network security situation is constructed. The framework normalizes multi-source heterogeneous security data into threat events with an attack pattern as the core and determine the attack state by the causal chain. Finally, the feasibility and effectiveness of the framework are verified by analyzing data in real business scenarios. This framework abstracts the multi-source heterogeneous data into an analyzable attack event, which greatly reduces the amount of data to be analyzed and improves the credibility of the network security situation data, realizing the identification of attack behaviors in the big data environment.
Effect of compaction characteristics on hydraulic conductivity performance for sedimentary residual soil mixed bentonite as compacted liners
Authors: Khalid Norazlan , Mukri Mazidah , Kamarudin Faizah , Abdul Ghani Abdul Halim
Published: June 2020

This paper discusses on the compaction effect to the hydraulic conductivity performance for the sedimentary residual soil mixed bentonite. This mixture is proposed as a barrier material in landfill area and may possibly potential materials for use as compacted soil liners in landfills for leachate protection. A laboratories series was conducted to evaluate the effectiveness of compaction characteristics on sedimentary residual soil mixed with different percentage of bentonite (5%, 10% and 15%). The sedimentary residual soil sample was used in this study and was collected in sedimentary residual formation area in Salak Tinggi, Malaysia and named as Salak Tinggi soil. The mixed samples were compacted at three different compaction effort with different energy to determine the maximum dry density (MDD) and optimum moisture content (OMC). Then, the permeability test to determine the hydraulic conductivity (k) was conducted at MDD condition at every compaction effort at effective stress of 100 kPa. The results show that the MDD value were slightly low for the entire soil sample mixed with bentonite at all compaction energy level. Instead it shows all the three different compaction efforts applied to the mixed soil samples with bentonite yielded hydraulic conductivity less (k ≤ 1x10−9m/s). In fact, the increment of bentonite content also resulted in lower of MDD value and hydraulic conductivity value. However, MDD values were found to be higher for mixed soil when compacted with high compaction effort. The results of hydraulic conductivity tests demonstrated that hydraulic conductivity, k ≤ 1x10−9m/s can be achieved just by using lower compaction energy for the soil mix with bentonite. Instead it considered as suitable materials for liner due to the hydraulic requirement for soil barrier, k ≤ 1x10−9m/s. This finding show that compaction efforts play an important role for workability of the mixtures and significantly to be used as compacted of soil liner materials.
Determinants of Green Highway Implementation Factors by Using Partial Least Squares
Authors: Mohd Nusa Fatin Najwa , Mohamed @ Arifin Mohd Amizan , Ab Rani Nur Izzati , Abu Bakar Azlan , Nazura Paimin Aini , Soo Fen Fam , Abdul Rahman Siti HamidahA
Published: June 2020

Malaysia was officially launched Malaysia Green Highway Index (MyGHI) manual as a guideline to confirm the green credential of a highway, this concept is at the conforming stage in Malaysia with seventeen (17) operated tolled highway projects and eleven (11) other registered and awaiting assessment for certification. Subsequently, INFRASTAR developed as an evidence-based rating system for infrastructure projects. Further measurement should be taken into account from the perspectives of highway concessions and stakeholders. Thus, this is not only to focus on the rating scores; as well as to highlight the driven factors that lead to Malaysia’s green highway implementation. The primary constructs of this research model namely green highway challenges, green highway characteristics and green highway implementation are assessed. A total of 63 surveys from 81 surveys were responded (77.8% of responses rate). The response rate was high, and there was no evidence of bias noted. The statistical result of this study corroborates the exploratory study interviewed earlier which suggested a positive relationship between green highway characteristics and green highway implementation. Besides, all the constructs represent 12.8%, 37.7% and 96.2% of factors for challenges and characteristics towards green highway implementation in Malaysia’s operated tolled highway projects, respectively. Implications and future research directions of this study are discussed.
The competency component needed by the Project Manager in managing the Road Project in West Sumatera, Indonesia
Authors: Edrizal  , Mairizal  , Alzahri  , Abd Majid Muhd Zaimi
Published: June 2020

Road construction and upgrading projects are currently being intensively implemented in West Sumatra, and this is very important in increasing the competitiveness of the Indonesian economy. During the construction period, it will give a positive impression to be able to reduce transportation costs, use value and labour productivity. In this case, a project manager will play an important role in the success of the project. There are some opinions that a project manager will determine the likelihood of a project success, even though their projects often facing big problems. In this paper, the focus is on determining the competency component of the Road Project Manager in West Sumatra in implementing the Project Management concept that leads to project success. Based on this and in accordance with this study, the approach used in data collection and processing is a qualitative. The results of the factor analysis are shown to the experts, to establish that all of these factors are important in developing the success of the project managed by the Project Manager. The results of the factor analysis obtained 65 combined factors what has been validated by experts. In conclusion, all these factors are important in determining the performance of a Project Manager in West Sumatra.
Evaluation of Toll Road Pavement Performance Based on the 2013 Bina Marga Method (Case Study: Serpong-Pondok Aren Toll Road)
Authors: Maria T , Amelia M , Vembrie S
Published: June 2020

Traffic growth due to economic growth in a region, impacted pavement on bearing a heavier load. Faster road pavement damage is one of the consequences of this incident, whereas toll roads are required to provide much better performance. Therefore it is necessary to conduct a study relating to the analysis of the results of road pavement performance as one part of the evaluation of pavement conditions. The purpose of this study is to conduct a pavement evaluation both functionally and structurally based on the 2013 Bina Marga method. The results of this study are expected to provide benefits in developing toll road maintenance policies and plans. The method used in this study is a survey method and descriptive statistical analysis of the data collected. Based on the results of this study, IRI values in each row can be categorized very well. In the last 5 years, only 24 points were found that had IRI values> 4, at STA 5+-500 lane 1 of Pondok Aren-Serpong showed unevenness at the same station for several years. RCI values indicate that pavement is classified as very good and regular. PSI values indicate that the pavement has provided sufficient services. The deflection value is an average of 167.47 micrometers with deflection uniformity of 0.222 so that the pavement is classified as very good. The results of the analysis of the pavement performance evaluation that has been carried out, show that the performance of the pavement, both functional and structural for the road on the Serpong-Pondok Aren toll road is classified as good.
Effect of the Densification of the Reinforced Asphalt Mixtures on the Permanent Deformation
Authors: Aman M Y , Alnadish A M , Rohani M MD , Danial D B , Mohamad Tahir M N M
Published: June 2020

This study aims to provide a better understanding for evaluating the resistance of the reinforced asphalt mixtures to permanent deformation. The resistance of asphalt mixtures to permanent deformation was assessed using dynamic creep test at a temperature of 40 °C. Four mixtures namely Mix1, Mix2, Mix3, and Mix 4 were evaluated, Mix1 corresponds to the control mixture that containing coarse steel slag aggregate while Mix2, Mix3, and Mix4 represent the reinforced mixtures with polyester fiber at the proportions of 0.05, 0.15, and 0.3%, respectively. The findings of this study showed that the elastic deformation occurred at the primary stage has a negative influence regarding the permanent deformation assessment. In addition, increasing the content of the polyester fiber has a positive relationship with the elastic stage; the higher the proportion of the fiber, the higher the deformation at the elastic stage, which have a negative effect on the evaluation of the mixtures resistance to permanent deformation, if the deformation occurred at the elastic stage is not excluded. On the other hand, the mixtures containing a high content of polyester fiber exhibited better resistance to the permanent deformation at the viscoelastic stage.
Rheological Properties of Bitumen Containing Organic Foaming Agent for Warm Mix Asphalt
Authors: Muhaimin Memon Abdul , Hazwani Nur , Hartadi Sutanto Muslich , Bala Nura
Published: June 2020

Pavement industry is placing more emphasis on incorporating the sustainability in road construction. The construction of road contributes to global warming in terms of greenhouse gas emissions. Generally, the construction of roads adopt hot mix asphalt (HMA) that requires high energy consumption and also lead to environmental pollution. Since last decade, warm mix asphalt (WMA) technology is an attempt to address the aforementioned energy and environmental problems by reducing the harmful emissions and energy consumption. This study investigates the effect of organic foaming agent zeolite on the rheological properties, mixing temperature and compaction temperature of bitumen used in WMA. Dynamic shear rheometer (DSR) characterization is performed to determine the effect of zeolite on complex modulus (G*), phase angle (δ) and Superpave rutting parameter (G*/sirδ) of bitumen. In addition to that, viscosity characterization using Brookfield rotational viscometer is conducted to determine the mixing and compaction temperature. Rheological characterization of binder containing zeolite shows the improvement of elastic segment and short-term ageing resistance. Viscosity characterization reveals that the addition of zeolite in bitumen offers significant reduction in mixing and compaction temperature. Based on the findings of this study, 3 % zeolite can be added to WMA technology as optimum additive content in order to reduce the energy consumption and improve the workability of road construction thereby promoting sustainability in pavement industry.