bluuebunny/crossref_metadata_2025_split huggingface dataset:
Multistage Control of Weak Microgrid with Power Quality Improvement Based on APF
Authors: Zhang Hong yang , Shi Zhen tang , Du Hong yong 
Published: June 2019

AbstractThe power quality of weak microgrid is sensitive due to the nonlinear loads and power electronic devices are applied, and the adjusting automatically compensation function of equipment self is inadequate and ineffective. For this, the control characteristic of active power filter(APF)is studied, and the droop control is analyzed in weak microgrid especially under the isolated island, and the principles of parameter adjustment are proposed. Then the multistage control algorithm of weak microgrid is proposed that improve the power quality and reliability based on APF, the algorithm is that the APF execute multistage filtering process according to the characteristics of harmonic and the other source are designed under droop control scheme, and the constraint condition which considering the THD of load current makes it contributing for the stability and reliability between APF and sources. Further, the mutual influence between multistage control algorithm and transition loads shedding considering different degrees of importance are discussed so that the scheme achieve a higher reliability. Finally, the effectiveness of the control algorithm proposed that taking oil field microgrid as an example in this paper is demonstrated through simulation and analyses.
Study on energy consumption of multi-trains tracking on long heavy down grade of high-speed railway
Authors: Chen Y , Guo H G , Ai Y P , He H 
Published: June 2019

Abstract
For the characteristics of high-speed train tracking operation on long heavy down grade of High-speed Railway, a cellular automaton dynamiccs model is proposed to simulate the energy consumption of multi-train tracking operation on long heavy down grade based on the NaSch model. Through numerical simulation, this paper studies the influence of different long slope value on the energy consumption of high-speed railway traffic flow. The simulation results show that the energy consumption model can accurately reflect the energy consumption of multi-train tracking operation on long heavy down grade. At the same time, the phenomenon of traffic waves that sometimes go and sometimes stop is reproduced. According to the simulation results, it can be concluded that the total energy consumption of multi-train tracking flow decreases gradually with the increase of slope value. The simulation results show that the energy consumption of starting, accelerating and decelerating of high-speed trains will decrease with the decrease of slope value. The results provide a scientific theoretical basis for efficient operation and energy-saving operation of high-speed railway. It has some guiding significance.
Connectedness Study on the Main Financial Institutions by Metal Mining Listed Companies from Perspective of Complex Networks
Authors: Ding Yun 
Published: June 2019

Abstract
This paper studies the network model of the relationship between metal mining listed companies by co-holding financial institutions as the node, and adopts the complex network theory analysis method to carry out the centrality calculation of the network model. The aim is to analyze the impact of main financial institutions in equity financing of China’s metal mining listed companies on the relationship between listed companies in the metal mining industry. According to the research, it is found that the overall network relationship characteristics of metal mining listed companies, the status of each company in the network and the interrelationship of each company. Meanwhile it can help metal mining listed companies to make correct decision-makings, effectively promote enterprises improvement and development.
Protection Scheme of Multi-terminal Flexible DC Distribution Network Based on Current-Limiting Inductor Voltage
Authors: Shangguan Xin , Qin Wenping , Wang Cheng , Niu Yuan 
Published: June 2019

Abstract
The rapid development of power electronic devices has promoted the rapid development of multi-terminal flexible DC distribution networks, indicating the direction of DC technology and urban power distribution systems. However, there are several technical problems in multi-terminal flexible DC distribution network that still need to be solved. In relay protection, the main difficulty faced by DC distribution network is the rapid and reliable identification of DC faults. This paper proposes a multi-terminal flexible DC distribution network protection scheme based on current-limiting inductor. First, the system configuration of the multi-terminal flexible DC distribution network is introduced. Then, the DC-side fault characteristic of the flexible DC distribution network are analysed. Based on this, a protection scheme based on current-limiting inductor voltage is proposed. Next, a complete protection scheme is designed. Finally, the proposed protection scheme is verified by real time digital simulator (RTDS). The simulation results show that the scheme is not affected by the fault resistance and fault distance.
Simulation Analysis of Propylene Storage Tank leakage Based on ALOHA Software
Authors: Yang Rili , Gai Ke , Yang Fengfeng , Zhang Guangsheng , Sun Ning , Feng Biyang , Zhu Xiulan 
Published: June 2019

Abstract
Hazardous chemical leakage accidents occur frequently, and once it appears, it will create a great effect. If a more accurate risk assessment impact area can be made in advance, the preventions and controls will play an invaluable role. A propylene storage tank in an industrial park was taken to identify the lying accidents and the risk ranks with the method of Preliminary Risk Analysis. It was found that the propylene poisoning accident and the steam cloud explosion accident have a great threat to the surrounding. With the inputs of relevant parameters, ALOHA software was used to simulate each accident, and the propylene poisoning accident and the vapour cloud explosion accident threat areas were obtained. The simulation provides effective information for the prevention and control of leakage accidents in the propylene storage tank leaking, and provides a scientific guideline for its ordinary safety management.
Ring-shaped DC Distribution Network Protection Scheme Research Based-on Voltage Prediction
Authors: Chang Xiao , Wang Cheng , Liu Yizhao , Zhang Min , Fan Rui , Shang Guanxin 
Published: June 2019

Abstract
In this paper, it researches the DC-ring distribution network protection scheme. Firstly, it analyzes the fault characteristics of the voltage source converter (VSC) during the DC line-to-ground. Secondly, it proposes a DC distribution network protection scheme based-on local measurement. The quadratic time-varying function is utilized to predict the line-side voltage in case of failure. The difference between the predicted voltage and the measured voltage on the line side in case of failure is utilized as the primary protective action criterion. Under voltage protection is utilized as backup protection in DC ring distribution network to guarantee safety and stability in case of failure. And the overcurrent protection is utilized as the startup criterion. The additional criteria are added to the further distinction between internal faults and external faults to prevent protection malfunction. The loop DC-distribution network protection scheme simulation based-on real-time digital simulator (RTDS) has verified the feasibility and effectiveness of the proposed scheme.
Deformation and Reinforcement Monitoring Analysis of Tail Water Outlet Slope in a Hydropower Station
Authors: Zhang Xu , Zhou Shaowu , Zhang Cheng , Gong Weiqiang , Qiao Yu 
Published: June 2019

Abstract
The slope stability situation surrounding the dam site area is very important to each correlative department during constructing hydroelectric power station. So it is important to enforce the high slope rock deformation monitoring, and to process and analyze the measuring data timely. Surface displacement of different height of slope were tracked and monitored based on the field investigation of a hydroelectric power station in Jinsha river. Deformation and the static stability of high slope were analyzed by utilizing rock deformation monitoring data. Taking the left-bank tailrace outlet slope of underground power station for example, we analyzed the slope stability by numerical simulation to obtain the characteristics of deformation and failure of slope. The time and space deformation distribution regularity of rock mass were summarized, the deformation, stress and failure of the studied slope were simulated. The results intuitively show the displacement distribution characteristics and slope plastic failure.
Study On Axial Clearance and Seal of Scroll Compressor
Authors: Wang Jianji 
Published: June 2019

Abstract
In order to reduce the leakage of the axial clearance, the sealing strip is mounted at the top of the scroll tooth. For achieving the axial displacement compensation seal, it is put forward to open a hole that it is in one side of the high pressure chamber at the bottom of sealing groove. The high pressure chamber gas is introduced into the bottom of the seal. It can form a pressure difference. The article begins with the design of sealing groove structure. The stress analysis was carried out on the sealing strip, and sealing strip was established displacement calculation model of change. Secondly, through the simulation experiment, the friction and wear properties of several kinds of seal materials are compared and analysed. To select PEEK as sealing strip material is the most appropriate. Finally, taking typical parameters of involute scroll compressor as an example, the compressive performance of scroll teeth with sealed structure and non-sealed structure is simulated. The results show that the sealing displacement and axial clearance are basically the same under the two schemes. The sealing scheme is proved to be feasible. This lays the foundation for the further study of the axial seal of the variable section scroll compressor.
Effect of gas flow rate on the double gas-assisted extrusion forming of plastic pipes
Authors: Ren Zhong , Huang Xingyuan 
Published: June 2019

Abstract
To overcome the extrusion problems of plastic pipes, the double gas-assisted extrusion method was used in this paper. To investigate the effect of gas flow rate on the double gas-assisted extrusion forming of the plastic pipes, the numerical simulations based on the finite element method were performed. Numerical results show that with the increase of the gases flow rate, the inner radius increases and the outer radius decreases, which lead to decrease the wall thickness of plastic pipes. At the same time, the flow velocity changes of melt under the different gases’ flow rate were obtained and compared. To ascertain the mechanisms of shrinkage phenomenon of wall thickness, the normal stress and first normal stress difference distribution nephograms of melt under the different gases flow rates were obtained. Results show that the normal stress effect of assisted gases on the melt is the main reason that the wall thickness is decreased by the larger assisted gases flow rates.
Digital Computational Design: Towards A Material Culture
Authors: Wang Chen , Feng Zhiyu 
Published: June 2019

Abstract
The purpose of this study is to explore the relational, complementary and speculative co-existence in the design methods of thinking modes which lie in ‘New Materialism’ and computational design and their influences on architectural design applications, urban design and morphological design. As the properties of materials can give impetus to urban development, urban development can also exert its influences on materials. Similar to the beginning of all construction activities, materials are also related to all fields of design and construction in a direct manner. Taking into account the influences of New Materialism, the author then started to examine the relationship between materiality and digital diagrammatic design again. Being a new type of biomass materials, the bio-plastic is becoming increasingly popular in urban design. The environmental problems brought about by the frequent use of petroleum-based plastic have been solved by bio-plastic successfully. The computational tools can be applied to regenerate urban. Also, the critical media of geometry can launch out a new dialogue between the material and urban design.
Application of Composite Shell Lining for Qingdao Metro Xizhen Station
Authors: Du Qing , Sun Shanzun , Wen Shuyi , Zhan Guyi , Li Yang 
Published: June 2019

Abstract
Combined with the composite shell lining design of Xizhen station of Qingdao Metro line1, application of composite shell lining in Qingdao Metro station is introduced. The composite shell lining technology is set forth from such aspects as Mix design, characteristic research, construction technology and quality control, test standard and construction matters of structure fibre concrete, as well as good result is obtained in the practice. This paper provides some reference for the design and construction of similar tunnels.
Method of Comprehensive Risk Management for Satellite Transportation
Authors: Hongxian Zhong , Shuang Zou , Lei Zhang , Yibo Wang 
Published: June 2019

Abstract
Satellite transportation is the special link in the development of satellite. It’s different to the constant and controllable environment in building. Due to the large geographical area, complex climatic conditions, limited protection of packing box of satellite, and many burst links in the process, these are many risk items in satellite transportation and the risk items are all highly hazardous. Transportation has critical influence for the development of satellite.
This paper analyzes the timing and methods of risk identification, risk assessment, risk decision-making and control in the transportation process for the purpose of comprehensive risk control of satellite transportation work, and puts forward the viewpoint of “Reducing risk list and quantifying risk control”. The refined risk identification method proposes different control methods for different types of risks. The method designed in this paper is used in the factory transportation of satellites, and the application is in good condition, which effectively guarantees the safety of satellite transportation.
Application of adaptive square root cubature Kalman filter in turbofan engine gas path performance monitoring
Authors: Zhu Jietang , Hu Yu , Li Yin , Ming Anbo , Yang Zhengwei , Zhang Wei 
Published: June 2019

Abstract
Kalman filters are very popular in turbofan engine community for health monitoring purposes. In this study, in order to get better performance in terms of filtering accuracy and noise adaptability, an Adaptive Square Root Cubature Kalman Filter (ASRCKF) was proposed to estimate health parameters of the turbofan engine gas path components. In the ASRCKF algorithm, the mean value and covariance of the engine nonlinear function were calculated by cubature rule-based numerical integration method and used as a substitute for nonlinear model in nonlinear Kalman filter. The latest information of measurement parameters in the recursion and filtering process was used to estimate and self-adjust the noises cross-covariance by removable window method to get higher filtering accuracy. Compared with the Extended Kalman Filter (EKF) and Square Root Cubature Kalman Filter (SRCKF), the simulation results in the gradual and rapid deterioration process of turbofan engine gas path components indicate that the higher accuracy and faster convergence can be obtained through ASRUKF, which can be used in health parameters estimation and condition monitoring of turbofan engine gas path.1
The Influence of Polynomial Order in Logistic Regression on Decision Boundary
Authors: Wan Xing 
Published: June 2019

Abstract
In machine learning problems, polynomial logistic regression algorithms are often used to classify data. Compared to linear regression, polynomial regression can not only deal with linear problems, but also deal with nonlinear problems. In the polynomial logistic regression algorithm, the polynomial order has a certain influence on the classification effect. This paper studies the influence of the polynomial order on the binary decision boundary in binary classification problem. By choosing different parameter values, an approximate optimal solution can be found.
Analysis of Running Stability and Tire Wear of Monorail Vehicles
Authors: Chong LU , Dong Bo , Cao Yu 
Published: June 2019

Abstract
Based on the movement state of straddle-type monorail vehicle and the force state of wheels, the theoretical model is established, and the dynamic simulation software is used to analyze the anti-overturning stability of guide wheels and stabilizer wheels of straddle-type monorail vehicle under pre-pressure. Three layout schemes of guide wheels and stabilizer wheels are established, and the motion state of straddle-type monorail vehicle under three schemes is compared and analyzed. It is found that the motion state of monorail vehicle is mainly limited by the rolling stiffness and the shaking head stiffness of the vehicle itself. By increasing the rolling stiffness, the roll angle of the vehicle can be reduced, so as to reduce the load variation and speed difference of the running wheels and reduce the wear of the running wheels. Over-increasing the shaking head stiffness can reduce the side slip angle of the running wheels, so as to reduce the side slip of the running wheels and reduce the wear of running wheels.
Design & Development of Soundable CYO
Authors: Zhan Jianbo , Zheng Han , Wang Hao , Xie Jiao , Yu Tingting , Yue Baoshan , Wang Xu , Li Geng , Yu Zhenhua , Zhang Ying , Wang Tao , Yu Jiang , Li Liwei 
Published: June 2019

Abstract
In order to increase the interest of cigarette smoking, enrich consumers’ consumption experience, realize the satisfaction of hearing in the process of cigarette combustion, and meet the needs of some consumers who have little warning effect on hearing sound, a sound-producing CYO component was designed and produced, which uses the sound-producing device to be installed between the upper cover and the lower cover of the connector, so that the sound-producing mode of the connector adopts pure mechanical structure to achieve. The physical parameters of the splicer are calculated by ANSYS software, and the connecting effect is simulated. The CYO cigarettes connected by the connector are verified. The results show that the connector achieves the sticky effect and the tightness similar to the conventional cigarettes. There is no significant difference between smoking evaluation and smoke detection with conventional cigarettes, thus the ideal design effect is achieved.
Line of Sight Based Visibility Acceleration Method
Authors: Yao Yongqiang , Chen Yaojie , Tang Wenjun 
Published: June 2019

Abstract
Real-time fast display of 3D scenes is the basic content of visual simulation and one of the core links. The object-oriented quadtree is used to organize the scene. This method saves the object information with leaf nodes, which can reduce the storage capacity and processing time of the tree and reduce the management burden of the system scene. For the visual cropping acceleration problem, it is proposed based on the line of sight. The cone partitioning cutting method can effectively improve the precision of the cutting, reduce the number of nodes participating in the cutting, and has better cutting efficiency and higher stability. The effectiveness of the method is verified by designing comparison experiments.
Performance-based design method of steel-to-concrete post-installed connection under combined action of earthquake and fire
Authors: Obambi L H D , Qun Xie 
Published: June 2019

Abstract
ABAQUS software was first used to study the structure behaviour of steel-to-concrete connection by post-installed anchorage under cyclic loading. Three types of embedment depth 25d, 20d and 15d were considered. Based on previous simulation results of earthquake and fire, it can be concluded that the seismic performance of steel-to-concrete connection by post-installed anchorage is strongly related to the rotation angle 0 of steel beam. The heat analysis results indicate that the fire resistance of post-installed connection after 2 hours exposure could meet the requirement of related codes. Based on the simulation results mentioned above, a performance-based design conception with four performance levels has been provided to guarantee structure safety under the combined action of earthquake and fire. According to the principle of performance-based methodology, rotation angle 0 of steel beam and fire resistance rating T are chosen as critical index for performance evaluation. Among the 4 levels of performance, Level 1 has the highest specification for disaster protection. To achieve the performance level 1, the thickness of fire protection layer should not be less than 45 mm, and the embedment depth should be 25d at least.
Selection of Mechanical Design Indexes for Supporting Layer Based on Sensitivity of Asphalt Content
Authors: Wang Jian , Zhuang Wei , Chen Hao , Chen Sai , Bi Yu-feng , Zhang Hong-chao 
Published: June 2019

Abstract
In order to optimize the mechanical design index of asphalt pavement supporting which is sensitive to asphalt content, the mechanical parameters (dynamic modulus, compressive resilience modulus, compressive strength, shear strength, splitting strength and failure strain) of AC-20 mixture are selected as the research object, and the changes of these parameters with asphalt content are analyzed. The sensitivity of each parameter to asphalt consumption was analyzed by one-way ANOVA. The results show that the dynamic modulus and failure strain of asphalt mixture increase first and then decrease regularly with the increase of asphalt content, and the change of dynamic modulus is independent of loading frequency. However, the change of compressive strength, resilient modulus, shear strength and splitting strength is not significant with the increase of asphalt content. Dynamic modulus is most responsive to asphalt content under different asphalt types and gradations. Hence, it is suggested that dynamic modulus should be considered as the mechanical design index of load-bearing of asphalt pavement.
Finite Element Study on Shear Performances of In-filled Bolt Joint of Assembled GRC Wall with Light Steel Skeleton Frame
Authors: Tang Zhirong , Zha Xiaoxiong , Wang Baolin 
Published: June 2019

Abstract
A new in-filled wall is used in assembled steel structure buildings, which consists of two layers of glass fiber reinforced concrete (GRC) panels and a built-in light steel skeleton frame. To make this new wall fill in the main steel structure, a new in-filled bolt joint is used. In order to obtain the mechanical properties and failure modes under shear load, the shear performances of this joint were studied with the finite element (FE) software ABAQUS. The results show that before reaching the fracture failure strain, the in-filled bolt joint shows good elastic-plastic behaviour. When the strain of the in-filled bolt joint reaches the failure strain, the shear load reaches the peak value. Subsequently, due to the shear fracture of the bolt, the shear load drops rapidly. Throughout the loading process, the stress of steel beam and rectangular steel tube is always very small and the stress of the joint yields in a large area in the later stage.