bluuebunny/crossref_metadata_2025_split huggingface dataset:
Modeling and Simulation of Fuel Engine Rail Pressure System
Authors: Wang Hong 
Published: March 2020

Abstract
The rail pressure system of fuel engine is a nonlinear dynamic system with strong disturbance and its system modeling is especially important, the engine rail pressure system is taken as the research object in this paper, and the “pump-pipe-nozzle” mathematical model is established, the dynamic relationship among the cam speed of oil pump, the fuel injection quantity of fuel spray nozzle and the fuel pressure in the common rail pipe is explored in theory and simulation.
Optimization design of hoisting column for multi-casting system of solid rocket motor based on response surface method
Authors: Jiang Fulong , Cui Zhaoxia , Tao Yang , Zhou Le 
Published: March 2020

Abstract
The erection of the solid rocket motor multi-casting system is optimized. The three-dimensional parametric model of the column is established, and the static analysis is carried out to determine the total deformation and the equivalent stress distribution of the hoisting column. Take the important dimensions such as shaft diameter and length of column as design variables, mass, equivalent stress and maximum deformation as target variables. The multi-objective genetic algorithm based on response surface is used to optimize the size of the hoisting column. The results show that after optimization, the overall quality of the column is 28.931kg, which is reduced by 6.16kg, which is 17.7% lower than the original plan.
Optimum Analysis of Microporous Foaming/Mould Decoration Compound Forming Technology for Automobile Door Decoration Panel
Authors: Hu Yi , Yuan Tieqiang 
Published: March 2020

Abstract
All Energy conservation and environmental protection are increasingly concerned by the automotive industry. Lightweight vehicles are one of the effective ways to achieve energy conservation and environmental protection. As an important method in plastic processing, the microcellular foam injection molding process can further meet the requirements of lightweight vehicles while meeting the performance requirements of the parts. However, a large number of bubbles exist on the surface of the microcellular foamed injection molded product, and the problems such as large surface roughness, low gloss, and poor apparent quality restrict the application of the process in automotive plastic parts. In order to improve the surface defects of microcellular foamed parts, this paper establishes experimental schemes and mathematical models based on partial factor test design method, response surface design and genetic algorithm, and obtains the optimal micro-foaming/in-mold decorative composite injection molding. Process parameter plan.
Experimental Research on Physical Indices and Mechanical Properties of Sandstone under Combined Action of Chemical-Freeze-Thaw Cycles
Authors: Feng Xuezhi , Wang Yongyan , Ge Qiang , Yu Zhuoqun 
Published: March 2020

Abstract
In order to study the effects of chemical solution erosion and freeze-thaw cycles on the physical parameters and mechanical properties of rocks, sandstone samples from central Shandong Province were taken as the research objects. The freeze-thaw cycle test and uniaxial compression test were carried out for rock samples eroded by 0.01mol/L H2SO4 solution, 0.01mol/L NaCl solution and 0.01mol/L NaOH solution, respectively. The results show that the mass loss and porosity of rock samples eroded by different chemical solutions increase with the increase of freeze-thaw cycles, and the peak strength and elastic modulus decrease exponentially with the increase of freeze-thaw cycles. The damage degree of acidic solution to freeze-thaw cycling sandstone samples is the greatest, that of alkaline solution is the next, and that of neutral solution is the smallest. The conclusions can be used for reference in support and design of underground engineering.
Modeling and solving the dynamic problem of a porous rotational shell based by modified Boit’s theory
Authors: Hao Jin , Yu Xiang , Jing Lu 
Published: March 2020

Abstract
Combined the Boit’s theory and the classical elastic theory of thin shell, a new model for analyzing the vibrations of a thin fluid-saturated porous rotational shell is proposed and solved by the extended homogeneous capacity precision integration method and the precise element method. The present model is precise and closer to the real materials as it takes the fluid-solid coupling effect into account and doesn’t make any hypothesis for the fluid displacement. At the end of the paper, the accuracy of the model had been verified by experiment and FEM methods.
Simulation and Physical Experiment Study on Powder Metallurgy Preparation of Silicon Composite Powder
Authors: Jia Qian , Ding Zhaochong , Zhang Xiaona , Cao Xiaomeng , Teng Haitao , Li Yongjun 
Published: March 2020

Abstract
The compaction and sintering processes of multi-component silicon powders, including single-action die compaction, uniaxial hot pressing and bidirectional hot compaction, were numerically performed by FEM (finite element method) modelling. The relationships of initial packing structure, compaction method, pressing pressure and sintering temperature between overall relative densities of multi-component silicon components were systematically discussed and studied. Meanwhile, various macro- and microscopic properties of silicon composite powders were carefully characterized, such as overall and local relative density, local stress distributions and void filling behaviour. The results show that fully compacted silicon composite targets with low internal stress can be obtained by using uniaxial hot pressing or bidirectional hot compaction method. And the physical experiments were carried out to verify the accuracy of the simulation results.
Study on the Performance of Road Cement Stabilized Base Using Natural Graded Gravel
Authors: Yang Chenhui , Yang Jiaqi , Huo Zhiqiang , Yang Zhengxun 
Published: March 2020

Abstract
In order to alleviate the increasing supply shortage of building materials, this paper uses the method of comparative test to carry out a stability study of cement stabilized base with green cement bonded natural graded gravel on compressive strength, splitting strength, resilient modulus and other indicators. The research shows that the natural graded gravel, which is a kind of energy-saving and environmental natural building materials, has good road performance as a raw material for cement stabilized base with green cement binding. The green cement bonded base shows higher compressive strength, splitting strength and resilient modulus than those of ordinary Portland cement.
Optimization determination of three-dimensional solubility parameters of fluororubber F2603
Authors: Li Hongmei , Shi Xiaoqin , Feng Xuesong , Dong Liming 
Published: March 2020

Abstract
Turbidity titration experiment on fluororubber F2603 using a variety of good solvents and poor solvents, the minimum volume closure ellipsoidal fit is performed on the 48 cloud point data generated by KY (Kumar and Yildirim) first-order algorithm, thus determining the ellipsoid The ball center is a three-dimensional solubility parameter: δd=16.63(MPa)1/2; δp=11.25(MPa)1/2; δH=12.02(MPa)1/2, and the solubility parameter is 23.40(MPa)1/2.The reliability and accuracy of the fitting results are determined by the group contribution method, The solubility parameters have important guiding significance for selecting solvents with superior performance and determining better formulation design.
Research on Vibration Isolation Platform Based on Vibration Transfer Theory
Authors: Su Zhaobin , Zhang Yuting , Zheng Jianyi 
Published: March 2020

Abstract
Aiming at the interference problem of various vibration sources to laboratory precision instruments, combined with the theory of vibration transmission, the basic block design research based on large vibration isolation platform is proposed. Firstly, through the theoretical analysis of the vibration isolation platform, the transfer function of the vibration isolation effect with different damping ratios is obtained. Secondly, the parameter knowledge of the basic block model is analyzed, and the basic block is analyzed based on the analysis of the system resonance. Finite element analysis; finally, the vibration of the foundation and the basic block was measured by high-precision acceleration sensor. By analyzing the data, it was verified that the vibration isolation platform has obvious blocking effect on high-frequency vibration.
Determination of Arctiin in Fructus Arctii by Capillary Electrophoresis
Authors: Zhou Xiaojing , Liu Haixing , Wang Lintong 
Published: March 2020

Abstract
This paper investigated the determination of arctiin content in Fructus Arctii by high performance capillary electrophoresis (HPCE) method. The borax solution of 37.5 mmol concentration containing 12.5% methanol was chosen as buffer solution. The experiment was performed at a constant voltage of 16 kV and UV detection wavelength of 277 nm. The content of arctiin in Fructus Arctii was 26.45mg/g (RSD=3.34%) (n=7). The recovery was in the range of 87.6%-111.8% (n=5). This method is suitable for the detection of the content of arctiin in Fructus Arctii.
Feasibility Study on PRTV of Suppressing insulator Iron Cap from Corrosion
Authors: Tang Ping , Zhu Jun , Chen You , Wei Ming , Cao Xiaobin 
Published: March 2020

Abstract
UHVDC transmission line porcelain and glass insulator iron caps are seriously corroded, safe and effective anti-corrosion measures are of great significance for the stable operation of the power system. In order to determine the key parameters of PRTV spraying on the surface of insulator iron cap, a three-dimensional finite element model of insulator is established, and the test verified the feasibility of PRTV anti-corrosion of iron cap. The research results show that PRTV can effectively reduce the leakage current density of the insulator iron cap. PRTV can effectively prevent corrosion of the insulator iron cap, and can reduce the surface fouling speed of the insulator, improve the surface resistance of the insulator, and inhibit the insulator flash. The research results can provide reference for the research of anti-corrosion of insulator iron cap.
Calculation of Electrochemical Corrosion Rate at Elbow of Supercritical CO2 Pipeline
Authors: Chen Bin , Kang Qinghua , Ju Rongbin 
Published: March 2020

Abstract
Based on the CCUS project planned to run in a domestic oil field, the electrochemical corrosion at the bend of supercritical CO2 pipeline was studied by means of high-temperature and high-pressure reaction kettle hanging plate experiment, and the corrosion rate of X80 pipeline steel in unsaturated, saturated and supersaturated supercritical CO2 with water content was obtained. Then through COMSOL simulation of the corrosion rate of 90° bent pipe in the supercritical CO2 corrosion atmosphere, the maximum corrosion rate position of electrochemical corrosion generated under the action of flow accelerated corrosion (FAC) generated by supercritical CO2 fluid in the bent pipe was obtained, and corresponding anticorrosion Suggestions were put forward according to the research results.
Method of Tolerance Design and Verification of Parts Based on Follow-up Crankshaft Grinder with Following Double Grinding Wheel Frame
Authors: Fan Jinwei , Huo Leilei 
Published: March 2020

Abstract
Calculating the parameters of accuracy along each axis by the comprehensive geometric accuracy and then optimizing as well as assigning the accuracy, which is the cutting-edge way of accuracy design of machine tools. However, the guarantee of the comprehensive geometric accuracy of machine tools is ultimately to implement the tolerance of specific moving parts. In view of the present shortage about accuracy design of machine tools, this paper puts forward to a way to design and verifies the tolerance of movement parts based on the comprehensive geometry precision of K2-1080 Crankshaft Grinder with Following Double Grinding Wheel Frame.
Analysis of Electrostatic Driven Micromachined Gyroscope
Authors: Jiao Runyu , Luo Zhaomin , Wang Jianming , Xu Xingming 
Published: March 2020

Abstract
Micromechanical gyroscopes are an important inertial instrument used to measure the angular or angular acceleration of an object. China’s research in this field lags behind that of developed countries in the West. The research on the core components of high-performance micromachined gyroscopes is still in its infancy. In this paper, a fully symmetrical multi-ring vibration structure electrostatically driven micromachined gyroscope is proposed, which is studied from the theoretical basis, working principle, structural design, performance simulation, processing technology and device testing, including the following electrostatic drive micro Testing of mechanical resonant devices. The test methods of several main MEMS resonant devices are analyzed. Based on vector network analyzer, vacuum cavity, transimpedance amplifier and other equipment, the frequency sweep test is performed on the device, and the resonant frequency of the drive shaft is 23686.2z. The resonant frequency of the sensitive axis is obtained. For the 23980 Hz based on the principle of electrostatic regulation, a 2.5V electrostatic adjustment voltage is applied to the device, and the frequency cracking of the two modes is reduced from 293.75 Hz to 6.25 Hz, which improves the performance of the device.
Synthesis of zinc oxide nanorods with different aspect ratios by solvothermal method
Authors: Wan Lijuan , Yang Ming 
Published: March 2020

Abstract
The ZnOnanorods with different aspect ratios have been synthesized by solvothermal method. The as-prepared ZnOsampleswere characterized byBET surface area measurements, SEM and etc. By modulating the different reaction temperatures and the different precursors, the as-prepared ZnO samples with nanorods morphology and different radius were prepared and the influence of the reaction conditions are investigated. Also the different morphologies may influence the potential applications of the as-preparedZnO.
Facile synthesis of ternary oxide and the performance of photo-catalysis
Authors: Wan Lijuan , Yang Ming 
Published: March 2020

Abstract
Nano-structured Zn2GeO4 photocatalyst was prepared through solution phase route. The as-prepared products were characterized by Brunauer–Emmett–Teller (BET) surface area measurements and scanning electron microscopy (SEM). The experimental results revealed that for photo-degradation of MO, the nano-structured Zn2GeO4 samples with higher surface area have higher photocatalytic performance than bulk Zn2GeO4 synthesized through solid-state reaction.
A Study on Testing of Rubber Friction Coefficient and Its Wear Surface by UMT-2
Authors: Liu Wei , Zheng Yuqing , Wang Ting , Lv Lutao , Yang Zonglin 
Published: March 2020

Abstract
For some products as tire, shoes and other wear parts products, friction performance is a very important performance index. A series of theories had been put forward to study the friction properties. With the development of science, the method of rubber friction was more and more abundant, from the friction wear properties to the microstructure, as well as the simulation, all the friction performance of the study provided a reliable basis. UMT - 2 multifunctional friction and wear testing machine, friction properties of the rubber material to make relatively objective evaluation, can provide reliable basis for research on the properties of friction. Due to many factors influencing the rubber materials, rubber friction behaviour of the friction and wear mechanism of exploration would still need a lot of research work.
Experimental investigation on the dynamics of cathode spots in arc plasma descaling
Authors: Tang Zhongliang , Li Haibin , Liu Shulong , Liu Yi , Hu Jing 
Published: March 2020

Abstract
In the ferrous metallurgical industry, removal of the oxide layer on steel surface (i.e. descaling) with low pressure arc plasma is an environmentally friendly method. In this paper, high speed camera and oscilloscope were employed to diagnose the process of arc decaling. The evolution of cathode spots morphologies and the property of arc voltage fluctuations were investigated for different discharge conditions. The motion and lifetime of the cathode spots are affected obviously by discharge parameters such as pressure, electrode gap and arc current. The lifetime and velocity of the cathode spots are essentially depended on the properties of the substructure of the cathode spot. The fluctuations of arc voltage are directly associated with the dynamics of the cathode spots, and there are large voltage fluctuations for short spot lifetime, large velocity of the spots and poor conditions for spot ignition.
The Effect of Photoconductive Semiconductor Materials in Improving the Resolution of Femtosecond Streak Camera
Authors: Liu Xiaorong , Li Song 
Published: March 2020

Abstract
In this study, through the research on the effect of photoconductive semiconductor materials in improving the resolution of femtosecond streak camera, the effective value of applying photoconductive semiconductor materials to femtosecond streak camera is discussed and analyzed, and the effectiveness of photoconductive semiconductor materials in improving the resolution of femtosecond streak camera is verified. Method: In this study, first of all, the generation and recombination of carriers in semiconductors are studied. Solving the continuity equation is applied to further explore the law of the motion of carriers. Later, photoconductive semiconductor materials are used in the preparation of switching devices and scanning circuits. After that, the prepared circuit module is tested by dark current. The main purpose is to realize the resistance of the circuit switch in the intrinsic state and the dark state withstand voltage ability of the circuit switch. Results: It is found that the dark state withstand voltage of each switch can exceed 6000V. In addition, it is found that the current value of the switch under different light is different. When in the natural light, the current value is large. When it is in the state of shading, its current value is relatively small. The efficiency of all three switches is over 50%. The efficiency of nonlinear model is obviously higher than that of linear model, which can be more than 90%. By applying the semiconductor material to the femtosecond streak camera, the scanning circuit can be optimized effectively to meet the high standard requirements of the femtosecond streak camera for the scanning circuit, which has certain advantages, and has certain value and significance for improving the resolution of the second streak camera.
Effects of Alloying Elements on Mechanical and Electronic Properties of Cu by First-Principles Calculations
Authors: Peng Cheng , Zeng Lijuan , Huang Fuxiang , Zhong Mingjun , Liang Shuang , Ran Xiaojie , Zhou Lu 
Published: March 2020

Abstract
The effects of alloying elements (Mn, Cr, Sn, P, Be and Ti) on the mechanical and electronic properties of Cu have been investigated performing first-principles calculations. A supercell consisting of 107 Cu atoms and one solute atom is used. The calculated results show that the binding energy values of Cu107X alloys are negative, indicating they have thermodynamic stable structures. The ductility properties and hardness of Cu and Cu107X alloys are also determined based on the calculated elastic constants (cij’s). It is found that the ductility properties of Cu107X alloys decrease due to the addition of alloying elements, but they still exhibit plasticity. However, the Vickers hardness of Cu107X alloy is improved, and the Cu107Be has the largest calculated value of 5.62 GPa. In addition, the electrical conductivity of Cu107X alloy is reduced, among them, Cu107Be and Cu107Mn have relatively high electrical conductivity of 2.58 and 2.53*107 S/m, respectively.
Preparation and research of brush-coated solvent-free polyurethane anti-corrosion coatings
Authors: Han Zhongzhi , Shi Jiafeng , Ding Chao , Li Shi , Cui Cancan , Duan Shaoming , Wang Lei , Guo Xiaojun 
Published: March 2020

Abstract
In order to solve the problem of short gel time and difficulty in brushing of solvent-free polyurethane coatings, the coatings choose polyether polyester polyol and polyisocyanate prepolymer as the main film-forming materials, adding spherical ceramic powder to improve the wear resistance of the coating, combination of molecular sieve physical dehydration and oxazolidine chemical dehydration, effectively solves the problem of water sensitivity of paint, a solvent-free polyurethane anticorrosive coating for brush application was prepared. The coating also has good adhesion, excellent wear resistance and corrosion resistance.
Study on an angle measuring device based on mechanical gyroscope
Authors: Zhang Zilin , Zhao Huimin , Li Xiyuan , Zhao Xu , Sun Jingchao , Yan Zhou 
Published: March 2020

Abstract
The circular staggered magnetic field is studied and built. Then combining with the mechanical structure of the mechanical gyroscope, a tilt angle measurement instrument which cannot be interfered by the external conditions is designed. A stable working magnetic field is generated in the system itself. Based on the principle of electromagnetic induction, the tilt angle change is transformed into the electrical signal change output, and then the tilt angle is measured.
Analysis of Fatigue Fracture and Strength Improvement of Backup Rolls
Authors: Zhang Jiamin , Wang Xiaochen , Liu Huaqiang , Yang Quan , Xu Dong 
Published: March 2020

Abstract
As an important part of the cold rolling mill, the backup rolls are always in service under complicated stress conditions. Once the roll fails, it will bring huge economic losses. In this paper, the problem of fracture failure of the backup roll neck position in an 1150mm six-roll reversible cold rolling mill of a company is analyzed. The stress distribution of the barrels under working condition is calculated by the finite element software ABAQUS, and the stress value at the dangerous section of the backup roll is obtained. The fatigue strength safety factor of the backup roll is obtained by analytical calculation. Combined with the actual production situation, from the perspective of structure and size design, improved schemes can be proposed to improve the fatigue strength of the backup roll. This analysis can provide reference for related enterprises.
Analysis on calculating process of mechanical precision of devices on satellite
Authors: Xue Bijie , Zhang Lei , Zhong Hongxian , Jing Fa 
Published: March 2020

Abstract
With the gradual complication of the devices on satellite, the mechanical precision of some devices with accuracy requirements on satellite should be predicted after the assembly, in order to conduct the previous design of devices and accuracy assignment of satellite. This paper will discuss main factors which influence the mechanical precision of devices, process design and calculating method. And the position and orientation matrix is used to analyse the influence of error at each stage on mechanical precision of devices after installation. One thruster on satellite is chosen as an example to specify the calculating process and feasibility of this calculating method. This paper proves that the satellite structure assembly has a small impact on mechanical precision. The control method of mechanical precision is put forward at design stage and assembly stage of satellite, and the mechanical precision and error distribution method of devices on satellite is predicted through position and orientation matrix at previous work stage.