bluuebunny/crossref_metadata_2025 huggingface dataset:
Stress and Strain of Plant Polysaccharides Aerogels and Their Effects on Mechanical Properties
Authors: Zheng Han , Wang Hao , Tian Yuan , Wang Xu , Tian Yongfeng , Zhan Jianbo , Fu Rongrong
Published: November 2020

In order to verify the mechanical properties of plant polysaccharides aerogels, the polysaccharide aerogels were prepared by freeze-drying method. The aerogels were screened by raw material selection and mass ratio, and their mechanical properties were tested. The experimental results show that with the increase of starch content, the compression modulus increases gradually, and the elasticity decreases linearly with the increase of starch content. The main effect on the mechanical properties is that after the addition of polysaccharide macromolecules, they are entangled with KGM and gelatin skeleton molecules. The increase of concentration increases the interaction sites, and the intermolecular force increases.
Tribology performance analysis of oil for wet drive axle
Authors: Penghou Zhen , Yuexing Wang , Haizhen An , Li Chen
Published: November 2020

In order to solve the problems caused by the use of common gear oil in the wet drive axle, such as abnormal braking noise, excessive braking distance and severe wear of components, the special oil for the wet drive axle is developed in accordance with the new requirements for lubricating oil after the technical upgrade of the drive axle. Based on the actual braking condition of the wet brake, the oil tribology performance of the wet drive axle is tested and studied by using the brake test bench and increasing the energy density to improve the harshness of the braking condition. The results show that the method can distinguish oil with different tribology performance. The developed oil is superior to the reference oil in formulating smoothness, stability and mechanical transmission efficiency, providing better friction retention over long periods of use.
Study on martensitic transformation of Fe - based alloys with low relaxation based on constant strain constraint
Authors: Liu Linlin , Wang Xinyi , Du Jinqiao
Published: November 2020

The paper analyzed the martensite transformation characteristic of Fe-Mn-Si alloy by XRD analysis and tensile test under different deformation condition. In this study, the amount of ε martensite of Fe-17Mn-5Si-10Cr-5Ni alloy was lower than that of Fe-17Mn-5Si-2Cr-2Ni-1V alloy under the same deformation condition, but the change rate of ε martensite was much higher than that of Fe-17Mn-5Si-2Cr-2Ni-1V alloy, and the stress relaxation rate of the both alloys increased with the increase of the stop loading time, and the relaxation rate of the Fe-17Mn-5Si-10Cr-5Ni alloy was obviously higher than that of Fe-17Mn-5Si-2Cr-2Ni-1V alloy. (Abstract)
Effect of Different Molding Process on Mechanical Properties of 316L Stainless Steel
Authors: Zong Xue-wen , Liu Wen-jie , Yang Yu-meng
Published: November 2020

The effects of laser selective melting (SLM) and rolling on the mechanical properties of 316L stainless steel were studied. The morphology and fracture characteristics after impact were characterized by means of an optical microscope (OM) and scanning electron microscope (SEM), Meanwhile, tensile strength, hardness, and impact toughness are characterized. The results show that compared with the roll forming, the 316L stainless steel group formed by laser selective melting has surface holes, cracks and spheroidization, and the grains are smaller, the dimples are smaller and shallower, and the strength and hardness are higher than the roll forming. Plastic toughness is much lower than that of rolling.
Research on the welding performance of X70 longitudinal submerged arc welding ultra-abyssal pipeline steel
Authors: Gao Jixiang , Liao Daobiao , Li Liejun , Zhou Feng
Published: November 2020

In this paper, Gleeble 3800 was used to simulate the changes in microstructure and properties of X70 ultra-abyssal pipeline steel at room temperature under different welding line energies. The industrial welding test of X70 pipeline steel was also conducted by adopting the 4-wire Longitudinal Submerged Arc Welded process. By optimizing welding process parameters, a reasonable welding specification process was developed. The results show that at different welding line energies, when the cooling time t8/5 is 12 ~50s, the microstructure of the welding coarse crystal zone is mainly lambellar bainite and granular bainite, and the uniform distribution of granular bainite exists in the austenite, obtaining better impact toughness. Ultra-abyssal longitudinal submerged arc welding steel producing by the optimized 4 - wire energy welding process has excellent mechanical properties and crack propagation resistance.
Research on Design and Performance of Optic-thermal Coupling Effect Evaluation System for Aerospace Material
Authors: Junwei Wang , Lei Zhang , Pengsong Zhang , Bing Bai
Published: November 2020

The optic-thermal coupling effect evaluation system for aerospace materials is mainly used to simulate the environment of solar radiation with different intensities in a constant-pressure and temperature-varying environment to test the photochemical effect and optic-thermal effect tolerance of aerospace materials. This paper introduces the key design and numerical simulation results of the system. The results show that the temperature and radiation intensity range of system is sufficient to meet the test requirements of the national military standard. The deviation between the temperature setting value and the measured value is within 0.5°C, and the light deviation is less than 5%.
Study on Self-piercing Rivet and Mechanical Properties of Aluminum Alloy Joint
Authors: Feng Bo , Huang Lu , He Hongyan , Cao Can , Zhang Suqiang
Published: November 2020

In this work, the self-piercing rivet (SPR) experiments were carried out and the mechanical properties tests under different SPR process were taken. The effects of SPR process on the geometric characteristics and strength of the joint were studied. It was found that the SPR joint under displacement-controlled process had larger interlocking value, higher mechanical properties, more stable geometric characteristics, and better mechanical properties. The failure mode of SPR joints was mainly pull-off failure. And the mechanical properties of SPR joints decreased with the increase of head height of SPR, while the residual thickness has no significant effect on the mechanical properties. The mechanical properties of SPR joints were significantly improved when structural adhesive was added into SPR joints, in which the failure mode was transformed into joint drawing failure. In addition, the fatigue behavior of SPR joint was studied. It was found that there was no significant difference between displacement-control process and energy-control process in fatigue performance of SPR joint. Moreover, cracks were initiated on the surface, which meet the surface initiation mechanism.
Reliability analysis of box-shaped steel column subjected to blast loading
Authors: Xi Kuantang , Li Xiangyang
Published: November 2020

Structural collapse caused by explosion and terrorist attacks often occurs. Steel columns, as the main load-bearing members of steel structures, often cause continuous structural collapse due to their damage. In order to study the reliability of steel column subjected to blast loading, box-shaped steel columns are taken as the research object, with considering the uncertainties associated with blast loading and material properties. Damage is determined according to damage index based on the ratio of the overall displacement and the local displacement to the maximum displacement. In this paper, P-I curves evaluation method and Monte-Calro simulation method are utilized to obtain the failure probability and cumulative distribution functions of the damage index. The results show the importance of considering the uncertainties in assessing the damage index of the columns against explosion. Also, sensitivity analyses show that damage index has the highest sensitivity to peak reflected pressure.
An Analytical Method of Three Dimensional Elastic Solids
Authors: Hu XW , Zhang WX
Published: November 2020

According to the variational principle, the basic governing equations of three-dimensional elastic problems in symplectic system are established. According to the characteristics of Hamiltonian operator matrix, the boundary condition problem is transformed into eigenvalue and eigensolution. It is shown that the zero eigenvalue solutions include the solutions of tensile and bending problems in material mechanics, while the non-zero eigenvalue solution can describe the solutions of local deformation such as stress concentration caused by boundary conditions.
Symplectic Solutions in Stress Analysis of Thin Plates
Authors: Zhang WX , Zhou SQ
Published: November 2020

Aiming at the common elastic thin plate materials in engineering, the dual control differential equation and the complete solution space composed of zero eigensolution and non-zero eigensolution are established in the state space. On this basis, the non-homogeneous condition of the boundary and the solution method of the non-homogeneous equation are studied systematically. The stress distribution of thin plate bending problem is discussed with an example, and the stress concentration of material under special constraints is analyzed.
Study on Performance Aging of Nonmetal Low Voltage Metering Cabinet Shell in Typical Environmental Conditions
Authors: Angang Zheng , Xiangyu Yuan , Huaiying Shang , Suqin Xiong , Siyu Chen , Da Cheng , Hui Chen , Yifan Wang
Published: November 2020

One of the key technologies in the field of smart grid measurement is to make a breakthrough in the detection and evaluation of high availability materials in smart measurement equipment. Under the comprehensive cross action of multi environment, how to combine the nonlinear evolution and mathematical model to analyze the complex environment into the feature combination of multiple single environmental factors, and how to find the key parameter features to express the aging life of materials is the focus and difficulty of the research. On the basis of service life model, the research on protection measures and life assessment technology of smart grid measurement equipment can make the equipment realize wide area application and high availability under worse conditions.
Corrosion Analysis of Connecting Bolt Used for Terminal Block of Isolation Switch in 220kV Substation
Authors: Chen Hao , Gong Weiwei , Qiao Xin , Sun Yunfei
Published: November 2020

Isolation switch is mainly composed of insulation part, conductive part, supporting frame, transmission mechanism and operating mechanism, which is of great importance for the safety and stability of power grids. In this paper, the seriously corroded connecting bolts used for terminal block of isolation switch in 220kV substation was investigated by means of macro-morphology inspection, hardness testing, zinc coating thickness measurement, scanning electron microscope, microstructure analysis and energy spectrum analysis. The result showed that the poor quality of the zinc coating was the main cause of the corrosion failure of the bolting and the gap between the bolt and the aluminium terminal block provided electrolyte environment for galvanic corrosion. In addition, targeted suggestions were put forward in order to improve the corrosion resistance of the connecting bolts and avoid the similar corrosion failure.
Study on seismic behavior of new self-embedded retaining walls
Authors: Hua Bo LIU , Fan Jing MENG , Shao Zhen HUA
Published: November 2020

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.
Analysis and research on ultimate stress of main bearing block of wind generator
Authors: Wang Na , Fan Lei
Published: November 2020

As an indispensable part of wind turbine, bearing block is subjected to alternating load or impact load for a long time, so it is very important to analyze its dynamic performance and vibration. In order to improve the vibration resistance of the structure, this paper relies on the powerful modal analysis function of ANSYS software. In the analysis, the finite element optimization method was used to analyze the main stress and ultimate strength of the main bearing block of the wind generator. Furthermore, the results are used to guide the optimization of bearing structure.
Microchannel cold plate heat transfer and flow resistance characteristics calculation and structure optimization
Authors: Chen Xiaogen , Wang Xuesheng
Published: November 2020

This paper designs a microchannel liquid cold plate suitable for array multi-chip cooling. The influence of aspect ratio of rectangular cross section on heat transfer and flow performance of microchannel cold plate was studied by numerical analysis. The optimal ratio of height to width of rectangular section is selected and its structure is optimized. The results show that when the equivalent diameter of rectangular cross-section is fixed, the friction coefficient f and Nusselt number Nu increase with the increase of aspect ratio of rectangular cross-section; after optimizing the structure of the channel, the microchannel cold plate exhibits good heat transfer characteristics of low pressure drop, realizing effective heat dissipation and meeting the requirements of pressure drop.
Analysis and application of the relationship between wind power curve and power generation based on operating data
Authors: Wang Pingchuan , Zhang Yuanpeng , Yuan Shuai , Li Junen , Wang Dehua , Wang Yuejiao
Published: November 2020

Wind power curve has a certain promotion effect on increasing the power generation. Firstly, this paper analyzes various factors that affect the power curve of a wind turbine, and establishes a mathematical model of the power curve. Secondly, the relationship between wind power generation and power curve is analyzed, and the calculation formula of annual power generation is proposed. Finally, based on the data of an actual operating wind farm, a statistical analysis of annual power generation is carried out, and the power curves of two typical units is compared to analyze the causes. Through the analysis of examples, the effectiveness of the proposed method is verified, and it can provide a reference for improving the operation level of wind turbines.
Research and design of the smart field digital surgery system for emergency medical rescue
Authors: Zhao Xiuguo , Meng Lingshuai , Tan Shulin , Su Chen , Han Junshu , Sun Jinggong
Published: November 2020

Natural disasters happened frequently around the world resulted in vast injured persons. The injured needs immediate on-site treatment to either save life or decrease mortality rate. The field surgery system, constructing a complete field on-site treatment force, is the fundamental to provide immediate medical care for the injured. In this paper, a smart field digital surgery system, integration with remote consultation system, medical information system and self-support system, was constructed to satisfy the demand of fast surgical treatment for emergency medical rescue in complex regional environment. The field digital surgical treatment technology platform for the injured in emergency was established based on taking the control of the cleanliness of the surgical cabin, designing a remote consultation system, developing the medical information system, as well as designing miniaturization magnet of field magnetic resonance imaging (MRI) system, which significantly improved the surgical treatment capability of the field digital surgery system.
Research on the Construction of High-mobility Multifunctional Emergency Rescue Equipment Standard System
Authors: Xue Yanjie , Li Yong
Published: November 2020

In order to regulate and guide the high-quality development of the emergency rescue equipment industry, it is necessary to establish a perfect emergency rescue equipment standard system. The development status of emergency rescue equipment and standards was analyzed. China’s demand for emergency rescue equipment and standards was studied from different aspects. The results show that China is in urgent need of high-mobility multifunctional emergency rescue equipment and relevant standards. Based on the analysis, this paper proposes the basic principles, construction methods and dimensions model of the construction of China’s emergency rescue equipment standard system, and builds a standard system framework of high-mobility multifunctional emergency rescue equipment, which is conducive to improving the standardization construction in the field of emergency rescue and continuously improving China’s emergency rescue capabilities.
Analysis and Matching Calculation of Hydraulic Drive System of Tractor
Authors: Jing Zhou
Published: November 2020

Firstly, the matching principle of engine and hydraulic torque converter working together is introduced. Then, the mathematical model of matching input and output between tractor engine and hydraulic torque converter is established. The least square fitting method is adopted to fit the characteristic curves of tractor engine and hydraulic torque converter. The vehicle performance is evaluated by calculating the traction characteristics of the vehicle, which not only reduces the workload, but also improves the calculation accuracy
Exploration of Intelligent Traffic Control Network Strategy for Large-scale Traffic in Xiongan New Area
Authors: Fan Haimeng
Published: November 2020

Aiming at the low integration of the large-scale traffic control network in Xiongan New District and the current demand for intelligent traffic development, this paper designs an intelligent traffic control network communication model by integrating various traffic control terminal devices. The model combines relevant documents such as the urban planning outline of the Xiongan New District, and is based on the concept of smart city development. The designed intelligent traffic control network strategy can be effectively applied to large-scale traffic flow scenarios and provides a powerful tool for the realization of intelligent traffic control in Xiongan New Area.
Compensation of high frequency effects in dielectric spectroscopy with the coaxial transmission line structure fixture
Authors: Zhang Yuhao , Liang Chenghua , Luo Yuan , Qin Liwei , Huang Ying
Published: November 2020

The application of complex impedance detection shows a trend of multi-direction development. The impedance detection technology at home and abroad has expanded from the traditional fields of physics, electricity and chemistry or other fields. Therefore, under the condition of satisfying precision, the design of equipment needs miniaturization and simplicity more and more. Aiming at this trend, a fixture with coaxial structure is calculated and processed based on theoretical knowledge, and its availability is verified by actual measurement and HFSS simulation. On this basis, the physical phenomena of multiple reflection and electrical delay that cause the measurement error are analyzed, and the analytical compensation algorithm is given.
Quantum efficiency of transmission-mode graded bandgap AlxGa1-xAs/GaAs photocathode
Authors: Yang Yang , Cao Weiwei , Xu Peng , Bai Yonglin , Zhu Bingli , Wang Bo , Qin Junjun , Bai Xiaohong
Published: November 2020

Graded bandgap AlxGa1-xAs/GaAs photocathode with enhanced quantum efficiency is analyzed in this study. We present the relevant quantum efficiency equations by solving onedimensional continuity equations for transmission-mode graded bandgap AlxGa1-xAs/GaAs and standard AlGaAs/GaAs photocathodes. The results show that the built-in electrical field from bandgap gradation efficiently collects photogenerated electrons in the buffer layer such that quantum efficiencies in the short regions are improved in transmission-mode AlxGa1-xAs/GaAs photocathode. The results also show that a thinner buffer layer improves the short-wavelength response of transmission-mode photocathode. Increasing the active layer thickness improves long-wavelength responses but reduces short-wavelength responses. The method presented in this work may provide better estimate of performance and guide the optimum design of graded bandgap AlxGa1-xAs/GaAs photocathode.
RPMI-1640 laden alginate hydrogel microcapsule produced by a coaxial electrohydrodynamic method
Authors: Lu Zhang , Fulong Tan , Ruiwen Jia , Yiwei Wang , Zhihai Wang , Xi Chen , Jingang Gui
Published: November 2020

The microencapsulation of biomaterials has a broad application prospects in the field of biomedicine. This paper introduces design and setup of a coaxial microcapsule generator based on electrohydrodynamic (EHD) method. It includes a liquid supply system, a coaxial nozzle, a collector electrode, and a high voltage power supply. The ejection process is studied via LED illumination and a high speed CMOS camera. For the shell and core materials, alginate and RPMI-1640 culture medium are applied respectively. The effects of electric voltage and flow rate on the ejection frequency and volume of micro-droplet are investigated. The generated micro-droplets react in the collector electrode with CaCl2 solution. Alginate hydrogel microcapsules are produced with RPMI-1640 included. Good encapsulation is confirmed, by fluorescence microscopy, and with RPMI-1640 stained by sodium fluorescein. The produced microcapsule may be used in biological cell encapsulation, in the future.
Defect detection algorithm of plastic 3D paint surface based on image fusion
Authors: Shiwei Chen , Pengfei Zhang , Pan Guo , Yongying Yang
Published: November 2020

In this paper, we proposed a new novel algorithm to detect defects cataloged as dings, dents and scratch on plastic 3D paint surface using patterned illumination. This algorithm first fuses the continuous images through different ways to obtain one fused image, which is obtained by patterned light illumination. Then, a series of morphological operations are used to obtain high-contrast image for subsequent feature statistics and defect screening. Experiments show that real-time inspection can be achieved, and the detection of plastic 3D paint surface defects can be completed within 13s, with an accuracy of 86%.
Comparative analysis of various new activation functions based on convolutional neural network
Authors: Zhu Jianhao , Chen Zong
Published: November 2020

With the rapid development of artificial intelligence, deep learning is developing rapidly. As the main framework of in-depth learning, convolution neural network achieved much in semantic segmentation and image classification. Based on the low speed engineering vehicle tracking system project, this paper studies the activation function, which is an important component of convolution neural network. Firstly, it summarizes the advantages and disadvantages of four traditional activation functions such as Sigmoid, and then introduces three new activation functions: Swish, FTS, and Relu-Softplus. Finally, using the TensorFlow framework, a single new activation function and a hybrid new activation function are applied to the convolution layer of the four neural networks constructed, and the image recognition comparison is performed in the data set CIFAR-10. It is concluded that the recognition precision of mixing the new activation functions is higher than that of using a new activation function alone, and the average time is shorter and the convergence speed is faster.
Calculation and Characteristic Analysis on Different Types of Shock Response Spectrum
Authors: Sun Wenjuan , Su Qiaoping , Yuan Hongli , Liu Liqin
Published: November 2020

Shock Response Spectrum (SRS) has been proved to be an effective standard tool for analyzing and quantifying shock environment in engineering, which is also the simplest tool for comparing shock severity and potential damage to structures. The calculation formulas of absolute acceleration spectrum, relative displacement spectrum, relative velocity spectrum and pseudo velocity spectrum are given respectively. The responses of different spectrum under typical semi-sinusoidal shock excitation are compared and analyzed, and some enlightening conclusions are obtained.