bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on seismic behavior of new self-embedded retaining walls
Authors: Hua Bo LIU , Fan Jing MENG , Shao Zhen HUA 
Published: November 2020

Abstract
This paper aims to explore the seismic mechanism of new self-embedded retaining walls through analyzing its embedded structures and numerical simulations, thus providing guidance for engineering practice and further development of new retaining wall. This paper discusses the working characteristics of self-embedded retaining wall in earthquake by using different reinforced scheme to simulate its seismic performance. SLIDE stimulates different reinforced scheme, which shows that the slope stability coefficient of horizontal reinforcement is larger than vertical watch reinforcement. The length and space of the reinforcement all influence the stability of the slope. The structural characteristics of self-embedded retaining wall shows that self-embedded retaining wall posses good seismic load transmission path and good seismic capacity. Firstly, the new self-embedded geotextile can effectively absorb seismic energy. Secondly, the movement of blocks, gravel filter layer and reinforced soil also plays an important role in energy consumption. Thirdly, high strength weight ratio can also reduce the seismic forces. Fourthly, gravel filter layer, geogrid and anchor rod which have a certain amount of damping force also posses good isolation performance. What’s more, anchor rods and geogrid which has a certain flexibility can restore to its original state within a certain time after the earthquake.
Construction of True Stress-Strain Curve of Metallic Material by Artificial Neural Network and Small Punch Test
Authors: Song Ming , Li Xuyang , Cao Yuguang , Ma Shuai 
Published: November 2020

Abstract
Small punch test (SPT) is used to evaluate mechanical properties of metallic materials by a miniature specimen. A method combining SPT and artificial backpropagation neural network for determining the true stress-strain curve of metallic materials is proposed. The load-displacement curves of different hypothetical materials were obtained by the finite element model of SPT with considering Gurson-Tvergaard-Needleman (GTN) damage parameters and used to train a backpropagation neural network. The relationship between the load-displacement curve of SPT and the true stress-strain curve of the conventional uniaxial tensile test was established based on the trained neural network, which is validated by the experimental results of X80 pipeline steel. The results demonstrate that the established relationship can be used to predict the true stress-strain curve of the metallic materials and then to determine their elastoplastic properties by SPT.
Study on Influence of Shield Side-piercing Construction on Pile Foundation of Nearby High-speed Railway Bridge
Authors: Lin YANG , Qing YUAN , Hong JIANG , Wei WANG 
Published: November 2020

Abstract
Taking the pile foundation of Suzhou Metro Line 3 passing through viaduct as the engineering background, the driving process of shield tunnel is simulated by finite element software. Through the analysis of surface settlement, bridge pier deformation and bridge pile foundation deformation in shield construction, the following conclusions are drawn: The foundation reinforcement “scheme of root pile + sleeve valve pipe grouting” has an obvious effect on reducing the ground settlement, the deformation of bridge piers and the deformation of pile foundation structure. The deformation and stress of the pile foundation of the bridge and the horizontal displacement of the pier above it are related to its distance from the tunnel, and the nearer it is, the greater its influence is. Whether the foundation is strengthened or not has little influence on the change law of axial force of bridge pile foundation, and the maximum axial force appears at the inflection point of horizontal displacement. Due to the excavation of shield tunnel, the bending moment of pile foundation changes in three sections along the depth direction, and the change of bending moment in the middle section is opposite to that on both sides.
Comparison of Vehicle Dynamics Performance When Operating on High-speed Dedicated and Existing Railways
Authors: Wang Qi 
Published: November 2020

Abstract
In order to study the parameters difference between the high-speed dedicated and the existing railway tracks, the geometric parameters and irregularity of the two kind of tracks are compared and analyzed. The nonlinear dynamic model of Electric Multiple Units (EMU) is built, and the difference of dynamics performance of vehicle running on different railway tracks is simulated and analyzed. The results show that the track spectrum overall performance of the high-speed lines is better than that of the existing lines. At the same speed, the lateral and vertical Sperling index of vehicle running on the high-speed dedicated railway tracks is better than that of the existing railway tracks. At low speed (160km/h), when the vehicle is running on the high-speed dedicated railway tracks, the maximum and rootmean square values of the frame lateral acceleration are 59.7% and 24.6% of the existing railway tracks operating conditions respectively, and the corresponding maximum and root mean square values of vertical acceleration are 49.1% and 89.8% respectively. At high speeds (350km/h), the maximum and root mean square values of lateral and vertical acceleration of the frame are 54.2%, 32.3% and 27.6%, 55.3%. With the decrease of the track curvature, the lateral wheelset force gradually increases.
Research on Key Technologies of Double-cylinder Synchronous Hydraulic Machine
Authors: Wanling Li , Hongmei Wei , Huaying Qiao , Lihua Jiang 
Published: November 2020

Abstract
In the operation of the double-cylinder gantry hydraulic machine, whether the two oil cylinders as the power transmission element are synchronized is an important factor affecting the precision of the workpiece manufacturing. Because the oil cylinder directly affects the horizontal precision of the beam of the actuator during the work of the press. Therefore, the double-cylinder synchronous precision control of the hydraulic machine is one of the key technical problems that needs to be solved in the manufacturing process of the hydraulic machine. This paper proposes a design scheme for the mechanical structure of the synchronous precision control of the double-cylinder gantry hydraulic machine. On the basis of using a simple hydraulic circuit to ensure the basic synchronization of the two oil cylinders, the flexible connection of the piston rod of the oil cylinder and the beam is used to reduce the damage caused by the deflection of the beam of the hydraulic system and machinery of the hydraulic machine. At the same time, a conehead is added at the end of the piston rod, and a taper hole is added to the corresponding part of the beam. By the alignment of the cylinder rod and the taper hole of the beam, the position of the beam is corrected so as to ensure the machining precision of the workpiece.
Finite Element Static Analysis of Main Arm for a Special Manipulator
Authors: Weiwei Zhang 
Published: November 2020

Abstract
With the development of modern industry, manipulator gradually replaces manual operation. In the process of grasping, moving and placing the workpiece, the manipulator needs to have high accuracy, and the movement track cannot be changed due to the force deformation. Rigidity refers to the deformation, that is, the main stressed parts of the manipulator should have good rigidity, and the deformation should be as small as possible to ensure the accuracy of the motion track. In this paper, the main arm and the auxiliary arm of the manipulator are analyzed by finite element statics. The results show that the displacement and the equivalent stress meet the requirements.
Corrosion Failure Analysis of Fittings Used for Electrical Equipment in 220 kV Substation
Authors: Chen Hao , Yu Xiao , Liu Xiao , Tian Feng 
Published: November 2020

Abstract
Electric power fitting is a metal accessory that connects and combines different devices in the electric power system, and transfers mechanical load and electrical load. Once the fitting fails, it would lead to large-scale blackout, so its reliability is of great importance for the security and stability of power system. In this paper, the seriously corroded electric power fitting in 220kV substation was investigated by means of macro-morphology inspection, chemical composition analysis, microstructure analysis, scanning electron microscope, zinc coating thickness measurement and energy spectrum analysis. The result showed that sulfur dioxide emitted from industrial production was the main cause of corrosion failure of the fitting. Meanwhile, the insufficient corrosion resistance of the fittings led to acceleration of corrosion process and premature failure of zinc coating. Additionally, effective suggestions were put forward in order to improve the anti-corrosion performance of the fittings in typical industrial pollution area.
DEM Modeling and Simulation of Axial Vibration Microfeeding System
Authors: Ma Ning , Sun Xiaopeng , Chen Song , Wang Xiaopeng 
Published: November 2020

Abstract
The conical head axial vibration microfeeding method was proposed for quantitative filling drug powder into the miniature multi-tank of a controlled-release drug delivery system. The discrete element method (DEM) model of the axial vibration microfeeding system was established by the commercial software PFC3D. Simulation research of the microscopic flow mechanism of powder in conical head under the axial harmonic excitation was carried out, and the effects of the conic angle of conical head, vibration amplitude on the flow rate were also studied. Results showed that powder in a conical tube under the axial harmonic excitation fell from the bottom to the top layer by layer, the powder also vibrated slightly in the falling process, and the friction between powders particles decreased because of the slight vibration. When the powder began to flow, the gap was significantly greater than the initial gap of the powder, and the gap fluctuated with the vibration excitation. The greater the angle of conical head, the more difficult the powder flowed out, and the flow rate was reduced. When the vibration frequency was a constant, the flow rate of the powder was decreased with the increase of the vibration amplitude. These results provide a reference for the design of axial vibration microfeeding system.
Analysis on the power system of photovoltaic diesel power storage ships
Authors: Guo Qixuan , Wang Jianjian 
Published: November 2020

Abstract
Aiming at the problems that current ships can only use traditional non-renewable energy sources such as petroleum as the source of power, and they would cause high energy consumption, and large pollution, a centralized control system for the power system of photovoltaic diesel power storage ships is designed. With the development of society, the concept of green economy and sustainable development is deeply rooted in the people’s mind. Green ship has become the main theme of shipbuilding. At present, internal combustion engines are used as the power source for ships, with limited endurance, high operation and maintenance costs, and accompanied by a large amount of exhaust emissions, which are not conducive to environmental friendliness. This problem does not exist in the photovoltaic diesel storage ship power system. The system integrates photovoltaic power generation and diesel power generation, and cooperates with the energy storage unit to allow the ship to adapt to various weather conditions to work normally, achieve the purpose of energy saving and environmental protection and extend battery life. It is an innovative energy saving and environmental protection system.
The mechanical properties in Welded SMA Alloys
Authors: Wang Wei 
Published: November 2020

Abstract
Laser welding technology is a more appropriate way in the processing of shape memory alloy. The mechanical properties and shape memory properties of the base metal and weld are tested, The comparison of the mechanical properties between the base metal and the laser weld is studied, and draw the conclusion. The mechanical properties are studied by temperature stress-strain test. The results show that stress-induced martensite changes little, the recovery mechanism of shape memory property is little affected by laser welding, and the laser welding method affects the properties of alloy weld to a small extent.
Study on action mechanism of reliability influencing factors for space drive mechanism
Authors: Yun LI , Jiabo ZHANG , Ting ZENG , Bo LIU , Jianchao HAN , Kai WANG 
Published: November 2020

Abstract
The action mechanism of influencing factors on the reliability of space drive mechanism was studied. According to the main internal factors that affect the reliability of space drive mechanism, such as material, machining accuracy, assembly error and preload, different failure modes caused by different influencing factors were analyzed. The evolution law of space drive mechanism under different temperature, different speed, and different load were studied. The high and low temperature performance test device of space drive mechanism was used to test driving precision and efficiency of space drive mechanism changing with temperature, speed and load. The test results show that transmission accuracy of space drive mechanism decreases with temperature increasing, and the speed has little effect on transmission accuracy of space drive mechanism. The transmission efficiency of space drives mechanism increases with temperature and load increasing, transmission efficiency decreases with speed increasing.
Observation of the femtosecond laser-induced ultrafast amorphization in Ge2Sb2Te5 films by dynamics spectrum
Authors: Wang Ying Hao , Liu Fu Rong 
Published: November 2020

Abstract
We demonstrate ultrafast amorphization in a Ge2Sb2Te5 (GST) film through a nonthermal process by femtosecond pump-probe experiments. A strong absorption peak in 532 nm is founded during the amorphization and the energy level corresponded is about 0.65~3.82 eV by calculations. First-Principles Calculations simulation experiments are used to prove the results of experiment and then explain the mechanism of amorphization of GST. Also, results of experiments show that the time to reach the absorption peak is decided by pulse width and wavelength but not the laser influence.
Low temperature annealing of a cold worked Zr-Nb alloy
Authors: Yi Peng 
Published: November 2020

Abstract
When typical Zr-Nb alloys undergo thermomechanical processing, they form additional Nb nanoclusters during the irradiation. This suggests Nb remains slightly supersaturated in the a-Zr matrix. To confirm it, assuming that the defect generated during irradiation stimulates the additional formation of these Nb nanoclusters, and the diffuse path is very short, cold worked ZIRLO with a high dislocation density is annealed at a similar temperature of the nuclear power plant to see if Nb precipitation will form. The XRD was used for indirect detecting the Nb precipitation formation. The result shows that Nb may precipitate at a temperature around 400°C, the stored energy from processing and aging at a slightly higher temperature to the operating temperature of nuclear power plants can also stimulate the precipitation of Nb nanoclusters.
Experimental Study on Crack Detection at Bolt Hole Edge in Rail Joint Using the Third Harmonic
Authors: Wang Chuang , Zhang Wei-Wei , Wang Hao-Ran 
Published: November 2020

Abstract
In this paper, a nonlinear ultrasonic detection method for detecting the hole edge crack in rail joint was proposed. The experimental results show that a single frequency sinusoid wave modulated by Hanning window is input to the rail specimen, there are higher order harmonics in the received signals for cracked rail, but there are no any harmonics for the rail with no crack bolt hole. That is to say the higher order harmonics can be used to indicate the presence of a crack. Furthermore, a nonlinear parameter μ is defined by the ratio of the third harmonic frequency peaks to the peak of the fundamental frequency. The relationship between nonlinear parameters and crack size is approximately linear, which means that the third harmonic not only can detect the presence of the hole edge crack, but also can assess the size of the hole edge crack.
Nonlinear Disturbance Observer Backstepping Control for Electric Dynamic Load Simulator
Authors: Zheng Yanbin , Yu Zhenglin , Ma Guo Qing 
Published: November 2020

Abstract
Electric dynamic load simulator (EDLS) is an experimental device that can simulate the load torque of aircraft steering gear under indoor environment. It has the advantages of high loading accuracy, small inertia, quick response and easy operation. There are time-varying parameters and redundant torque disturbance in the EDLS, so the conventional control algorithm cannot get the ideal control effect. In this paper, a controller based on matching uncertain nonlinear system is proposed based on the idea of backstepping control. Lyapunov method is used to prove the asymptotic stability of the closed-loop system. At the same time, the nonlinear disturbance observer is used to reduce the vibration of the controller. Experimental results show the effectiveness of the proposed control strategy.
Intelligent Assisted Driving System Based on Multi-MCU
Authors: Xia shixu , Xiong Yuhang , Gao Hao , Li Jiashun 
Published: November 2020

Abstract
The multi-eye vision image acquisition method is used to allow multiple cameras to collect panorama information around the car and send it to multiple MCUs (Microcontroller Units) to process the images at the same time, and then extract valid information. The main MCU comprehensively processes these valid signals to get the most urgent control signal, then drives the voice broadcast module to assist the driver in driving the vehicle. At the same time, the auxiliary MCU is set to monitor the operation of the main MCU and perform various control actions instead of the main MCU when it fails. This not only solves the contradiction between the high complexity of image processing and the requirement for fast signal processing and transmission speed, but also makes the car have good visual processing capabilities, control flexibility and safety.
A knowledge base model of integral impeller milling process based on Teamcenter platform
Authors: Yan Jiangyi , Qiu Wenwang , Liu Shujie , Zhao Tong 
Published: November 2020

Abstract
As an important foundation of integral impeller milling manufacturing, integral impeller milling process knowledge plays a significant role in design and production. With the rapid development of aerospace industry and intelligent manufacturing technology, it is very urgent to construct knowledge base of milling process for typical integral impeller structure. Based on the analysis of typical milling process knowledge of integral impeller, the study proposes a model of knowledge base of milling process of integral impeller based on Teamcenter platform, which can effectively realize the sharing and reuse of knowledge of integral impeller milling process.
Research on Characteristic Parameters of Integrated Circuit
Authors: Ding Zhangjin , Chen Xiaoming 
Published: November 2020

Abstract
In order to study the complex network characteristics of integrated circuits, this paper studies the importance of different characteristic parameters in characterizing the complex network characteristics of integrated circuits by comparing the correlation between characteristic parameter changes and circuit changes. Through the experiments, the important parameters of characteristic parameters in the characterization of integrated circuits are obtained, which is helpful for the design and optimization of very large scale integration (VLSI).
Control Optimization Method of Substation Inspection Robot Based on Adaptive Visual Servo Algorithm
Authors: Li Kaifeng , Ye Ziyang , Zhang Junjie , Chen Xiaoming 
Published: November 2020

Abstract
In order to enhance the accuracy of the target image captured by the substation inspection robot, this paper proposes an AVS algorithm based control optimization method for the substation inspection robot, which uses the feature transformation method to match the image and template image of the substation equipment captured by the robot, verifies the existence status of the target image elements in the image, and calculates the offset pixel correction results to capture more Accurate target image. The experimental results show that the method effectively improves the efficiency of image capture of inspection robot in substation equipment, and has good practical performance.
Study on the structural strength of MW scale wind turbine’s main shaft
Authors: Lu Sheng , Chen Zhixiang , Zhou Qinkai , Zhao Yang 
Published: November 2020

Abstract
The main shaft of the wind turbine is an important supporting component of the wind turbine and its performance directly affects the safety of turbine. The structural strength of the main shaft under the 7 ultimate load conditions is checked according to the working load data. The results show that the maximum working stress 182 MPa occurred in Mx (max) load conditions is less than the permissible stress. For the maximum limit working conditions, this paper proposes a method to change the diameter of the end of the main shaft to reduce the working stress. The results show that there is an approximate linear relationship between the diameter of the inner hole at the end of the main shaft and the maximum working stress. On the premise of keeping the quality unchanged, the maximum working stress can be effectively reduced by reducing the diameter of the inner hole, which improves the structural strength of the casting main shaft.
Design of A Three-DOF Redundantly Driven Parallel Robot Control System
Authors: Hongxia Zhao , Fanzhao Meng , Dongpo Wei 
Published: November 2020

Abstract
Parallel robot has advantages of no friction and clearance, fast response, compact structure, good rigidity, and low error accumulation, but they also have many shortcomings in geometric characteristics, such as small range of motion, poor flexibility, and singularity in the workspace. Adding redundancy can improve its geometric characteristics. Parallel robots are usually controlled by dedicated controllers, without openness, high development costs, and long cycles. This paper introduces the design of an open control system for a three-DOF redundant drive robot based on PC bus, and with "PC + motion control card" as the core.
Design of A Three-Degree-of-Freedom Redundant Drive Parallel Robot
Authors: Fanzhao Meng , Hongxia Zhao , Dongpo Wei 
Published: November 2020

Abstract
Parallel robot has advantages of no friction and clearance, fast response, compact structure, good rigidity, low error accumulation, but they also have many shortcomings in geometric characteristics, such as small range of motion, poor flexibility, and singularity in the workspace. Adding redundancy can improve its geometric characteristics. Due to its advantages in working space, flexibility, obstacle avoidance, and dynamic characteristics, redundant-driven parallel robots have received more and more attention, especially their important applications in many fields, which make up for the tandem robots. This paper introduced the design idea of a three-degree-of-freedom redundant driving robot, and proposed a corresponding structural design scheme. The robot was built with a double link mechanism. The main body included a work table, a link arm, an electromagnet pen holder, a drive unit, etc Four parts.