bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on application of high speed cross belt auger drilling machine in fragmentized coal seam
Authors: Pengbo Xu , Ke Yao , Rui Zhang , Peng Fang 
Published: August 2020

Abstract
In order to extract gas efficiently in soft outburst coal seam with belt haulage roadway, a ZDY2800LG full hydraulic drilling rig with high drilling rate, cross-belt construction ability and strong adaptability of technology was developed. The whole process of industrial test of drilling machine is introduced in detail through three stages of formation groping, breakthrough seeking and efficient drilling.
Study on the cavitation range of the side of the ultrasound radiation rod in aluminum melt
Authors: Su Sichao , Li Ruiqing , Li Xiaoqian 
Published: August 2020

Abstract
The effect of cavitation and sound flow produced by ultrasound in high temperature melt is utilized to achieve grain refinement. Previous papers mainly discussed the cavitation mechanism of the end face of the ultrasonic radiation rod, but did not pay enough attention to the cavitation effect on the side face of the radiation rod. Therefore, this paper studied the cavitation range of the side of the ultrasonic radiation rod. Firstly, the amplitude of the side of the ultrasonic radiation rod was measured. It was found that the amplitude of the side varied greatly with the location. Secondly, the simulation results showed that the vibration of the side of the radiation rod changed alternately with periodic peaks and troughs. Thirdly, the ultrasonic experiment of pure aluminum was carried out in crucible. Two titanium plates were cut into a suitable shape and placed in crucible. After 13.5 hours of ultrasonic treatment, it was found that the surface of titanium plates was not uniformly eroded, but the most serious cavitation erosion occurred in the middle position. Therefore, it can be explained that the cavitation effect occurred in this region. At the same time, the macrostructure of aluminium ingot treated by ultrasound was obviously refined.
Structure Design and Analysis of Portable Hoisting Equipment
Authors: Guobao Ding 
Published: August 2020

Abstract
Armor equipment replacement repair has been facing the problem is that the heavy parts in the car disassembly and assembly consume a lot of manpower. How to disassemble and assemble components efficiently and safely is not a perfect research field at home and abroad. The design of portable lifting equipment is very necessary in the disassembly process. In this paper, portable hoisting equipment is taken as the research object. Through the research on its hoisting mechanism, based on the introduction of mechanical structure and working principle, 3d modeling software Pro/E is used to model and virtually assemble portable hoisting equipment. In the later stage, the finite element analysis software can be used to check its stiffness and strength and optimize its design.
Application of full-section gas extraction drill in zhao zhuang coal mine
Authors: Yong Gao , Pengbo Xu 
Published: August 2020

Abstract
In order to solve the coal mine gas extraction from whole section fan-shaped hole fast construction technical problems, through to walk type crawler drilling rig structure and the design of the hydraulic system, developed a whole section of roadway fan in mine gas extraction hole drill, the Angle of institution by hydraulic motor driven rotary gear reducer to feed within a cross section of 360 ° fuselage quickly adjustable Angle, reduce the assistant time of drilling construction, the hydraulic system controlled by single action, the operation is simple and reliable. Field tests show that the drill has strong structural stability, easy to move, and is a monolithic crawler drill that can be applied to the construction of gas extraction borehole with large inclination Angle and full section.
Analysis and Optimization of Flow Field in Electrochemical Machining of the staggered groove on Gear Tooth Surface
Authors: Chen Yuanlong , Huang Zihao , Lin Hua , Chen Qi 
Published: August 2020

Abstract
Self-lubricating gears can better adapt to the bad lubrication conditions without oil or oil scarcity. Staggered groove can be produced by Electrochemical machining (ECM) on the gear tooth surface to fill solid lubricating materials. The cathode with and without flow slot has been designed. Three basin models have been established which are forward flow mode, reverse flow mode and side flow mode. The gap flow field of ECM has been analyzed. It is determined that positive flow is a suitable flow mode. By optimizing the structure of the flow slot in the cathode, the deficiency of the forward flow field is improved.
Research on Aerodynamic Characteristics of Forward-swept Wing with Inclined Basic Airfoil
Authors: Xinbing SU , Wen Jiang , Xiwei Zhao , Junyi Zhang 
Published: August 2020

Abstract
Variable forward-swept wing (VFSW) aircraft is a kind of typical morphing aircraft. With the change of forward-swept angle, the airfoil of Variable forward-swept wing which is based on incoming flow will also be changed, and this change has a very important influence on flight performance. In order to explore this impact, this paper firstly build nine airfoil models under different forward-swept angle, through the calculation by fluent, the impact on airfoil aerodynamic characteristics from angle of attack, mach number and forward-swept angle is analyzed. The results show that, while flying at the sea level in a low angle of attack, the lift coefficient, resistance coefficient and moment coefficient will increase with the rise of forward-swept angle, but while flying in a high angle of attack, these coefficients will decrease with the rise of forward–swept angle. The results also can provide references for further research of aerodynamic configuration of variable forward-swept wing aircraft.
Research on Equipment Life Cycle Cost Prediction Based on GA-LSSVM
Authors: Chen Yong-hong , Su Yong-sheng , Du Xiang-hua 
Published: August 2020

Abstract
Penalty parameter γ and kernel parameter σ
2 are two important parameters of LSSVM. In this paper, the GA-LSSVM prediction model is constructed, which the genetic algorithm was used to optimize the parameters. Comparing with LSSVM model, the GA-LSSVM model improves the disadvantage that the parameters can only obtained by experience. Also in order to check model prediction accuracy, the posterior difference method(PDM) was used. The calculation results show that the GA-LSSVM model has higher prediction accuracy than other models, and it is a feasible and reliable method for equipment life cycle cost prediction, also the model can be extended to other prediction fields.
Summary of ten innovations in the machinery field---the analysis on material processing contrary the mechanical principles etc.
Authors: Li C M , Yin X L , Zhang Y , Sun F , Cao H , Liu Q , Liu X 
Published: August 2020

Abstract
Ten innovations in the mechanics field are summarized. For the pre-published innovations, only the results are introduced. 1) The analysis of the diamond cutting tools characteristics based on the principle of the metal outflicting the wood. We create the word “outflict”. Its affix means surpassing, suppressing, holding high, having ability to defeat, conquer and constraint. Its morpheme means conflicting and striking. 2) The concept of mechanical principle. For instance, the structure body is classified into rod, block and plate. 3) The mechanism combination analysis method instead of body group and multibody mechanism. 4) A unified moment balance equation of rigid body. 5) The harmonic composition and decomposition method for the body position angle of crank rocker mechanism. 6) Definition of kinematics bifurcation position, including dead point. 7) Indefinite application in mechanical dynamics. 8) The assembly graphic method for vector equation with too many unknown quantities. 9) The derivation process of the velocity ratio formula of the coupling. 10) Velocity zero correction method considering the characteristics of static friction.
Multi-parameter joint optimization of self-piercing riveting on aluminum alloy plate
Authors: Zhang Y H , Shi B J , Zhong J B 
Published: August 2020

Abstract
Self-piercing riveting technology can achieve more efficient connection of aluminum alloy plate parts. In this study, the 5052 plate and the 6061 plate are taken as the research objects. By establishing a finite element model and using a multi-objective optimization method, multiple parameters are jointly analyzed. The sensitivity parameter analysis was used to determine the value range of the research parameters, and the response surface analysis method was used to construct the functional relationship between the parameter variables and the system response. Finally, a multi-objective optimization model was established to obtain a reliable combination of rivet parameters and die parameters.
Study on Topology Optimization Design of Screw Extrusion Filter
Authors: Chen Yuanlong , Cheng Qianqian , Chen Rongna 
Published: August 2020

Abstract
In order to meet the needs of sludge dewatering treatment in urban areas, a screw extrusion filter with dynamic and static ring was designed. The spiral axis of the filter is simulated by finite element statics. Based on the simulation results, the structure of the spiral axis was topologically optimized, and the optimized mathematical model was established. The minimum mass was taken as the objective function, and the reasonable structure size of the spiral axis was obtained after optimization. Under the condition of satisfying the structural strength, its quality was reduced by 9.7%, and a good optimization effect was achieved.
Profile imitation algorithm research for the cam contour
Authors: Qinglu Xu 
Published: August 2020

Abstract
In this paper, the characteristics and simulation accuracy of different simulation algorithms are studied for the cam profile. The triangular square approximation is improved, and a high-precision simulation algorithm is proposed. The improved simulation algorithm has achieved good results in practical applications. Comparative analysis using examples: comparing the accuracy of the three approximation methods of spline interpolation, unconstrained best square approximation, and best square approximation with first-order boundary. It is concluded that the optimal triangular square approximation of the first-order boundary can more accurately reflect the law of periodic motion, and is suitable for the state approximation and characteristics of periodic motion.
Study on vibration characteristics of plastic helical gear assembly with prestress
Authors: Baogui Wu , Zaiyou Du , Ruchen Huang 
Published: August 2020

Abstract
In order to obtain the vibration characteristics of helical gear transmission system in actual working conditions, two kinds of CAE software are combined to analyse the helical gear vibration with prestress. CAD software interface is used to import the model into ANSYS, and then multi-point coupling constraint is proposed to obtain the first six natural frequencies and main modes of the plastic and steel gears with speed and load. The results suggest that the design of plastic gears meets the requirement of bending strength, and prestress causes the natural frequency of the plastic gears to increase faster than that of the steel gears. The dynamics simulation of ADAMS multi-body system shows that the meshing frequency of plastic gear is obviously lower than the natural frequency, so the system will not resonate. Research shows that plastic helical gears can replace steel gears for low-speed gear pumps, which provides a research method for miniaturization, lightweight and precision designing of low-speed gear pumps.
Deduction of gear system proportion in any leaf rose line drawing
Authors: Ma Li’an , Yue Jixiang , Wang Guodong 
Published: August 2020

Abstract
Based on the planetary gear mechanism which realizes the three-leaf rose line drawing method, the ratio of the number of teeth of the sun gear, the planetary gear, the internal gear, and the length of the tracing rod are deduced. The calculation formulas of the number of teeth and the length of the tracing rod for drawing rose lines of any leaf are obtained. SolidWorks is used for modeling and dynamic simulation. The simulation results show that the conclusion is correct.
Gas column resonance analysis of reciprocating compressor
Authors: Zhenyu Zhang 
Published: August 2020

Abstract
The oscillation process based on acoustic vibration system and electrical circuit can be described by the same type of differential equation. MATLAB/SIMULINK was used to establish the electrical model of the outlet piping system of the 2D-90Mg-2.5/1.5 type air combined compressor in the laborator. The natural frequency of the gas column is obtained and compared with the results of finite element analysis. It is proved that the electrical simulation method is feasible and simple to calculate the natural frequency of gas column in compressor pipeline system.
The influence of temperature on the impedance characteristics of PEMFC
Authors: Liu Qian 
Published: August 2020

Abstract
Electrochemical impedance spectroscopy (EIS) is one of the main characterization methods of PEMFC, which has important reference value for evaluating the performance of PEMFC. In this paper, the impedance curves of PEMFC at different temperatures are measured by experiments, and the equivalent circuit is used to analyze the influence of battery temperature and humidification temperature on the impedance. The study found that when the battery temperature is higher than the humidification temperature, both the ohmic impedance and the Faraday impedance increase significantly; the double layer in the PEMFC mainly embodies the capacitive reactance characteristics, and the more the humidification temperature is higher than the cell temperature, the more obvious the degree of the double layer embodies the capacitive reactance characteristics. The results of this study have a certain reference value for understanding the working principle of PEMFC and improving its performance.
Research on Constitutive Relation of TC11 Titanium Alloy Based on PSO-LSSVM
Authors: Zhu N Y , Chen Q M , Luo X X , Cai G P 
Published: August 2020

Abstract
In order to accurately predict the flow behavior of the TC11 titanium, the uniaxial compressive tests of TC11 titanium alloy were carried out by Gleeble-1500 thermal simulator with the temperature in the range of 900∼1050°C, and the strain rate of 0.1∼10s−1. Then the particle swarm optimization (PSO) was used to optimize the parameters of the least square support vector machine (LSSVM) model, and a high-temperature constitutive model of TC11 titanium alloy based on PSO-LSSVM was established, and the average relative error between the predicted value and the experimental value of the established constitutive model based on PSO-LSSVM is 1.51%, and the correlation coefficient is 0.997. The established constitutive model can accurately predict the high temperature flow behavior of TC11 titanium alloy. This indicated that a new method for establishing the constitutive model is provided.
Synthesis and adsorption properties of cross-linked carboxymethyl starch (CMS)
Authors: Li H H , Gao Y H , Zhang L H , Li N , Liu Z F 
Published: August 2020

Abstract
Cross-linked carboxymethyl starch CMS was synthesized with cross-linked starch as raw material, sodium chloroacetate as etherification agent and sodium hydroxide as catalyst, and the structure of the product was characterized by FTIR, SEM and XRD. The optimum synthesis conditions of CMS were m (CSt): m (MCA) = 5:3, NaOH dosage 12 ml, reaction temperature 55 °C and reaction time 3 h. When the concentration of copper ion in the simulated water sample was 25 mg/L and the dosage of CMS was 2 g/L, the removal rate of copper ion was 96.0%, and the adsorption capacity of CMS was 15.4 mg/g.
Evaluation of Measurement Uncertainty of Oxygen in Titanium Alloys based on Monte Carlo Method
Authors: Liu P , Zhang Y , Zhang X Y , Zhang J H 
Published: August 2020

AbstractUncertainty is a scientific representation of the quality level and dispersion of measured results. Considering the key issues of the application of Monte Carlo method (MCM) to evaluate the uncertainty of the single-point calibration linear measurement system, such as the MCM evaluation model and the introduction of the uncertainty from the apparatus calibration and repeated measurements, two correction factors were introduced to characterize the random effects of conditional variations and system fluctuations on the measurement repeatability of the certified reference material (CRM) for calibration and the tested sample, and a mathematical model for evaluating the uncertainty of single-point linear calibration measurement system based on MCM was proposed. Then the specific evaluation process and application of MCM was systematically explained based on a case study for determination of oxygen content in Ti-6Al-4V titanium alloy by inert gas fusion - infrared absorption method. Under the measurement condition that the CRM repeated 4 times and the Ti-6Al-4V sample repeated twice, the simulation result was wMCM= 0.178 % ± 0.009 % (k= 2), which was consistent with the result of wGUM= 0.178 % ± 0.009 % (k= 2), based on the traditional GUM method recommended by ISO/IEC Guide 98-3: 2008. The new method solved the application of MCM to evaluate the uncertainty of the single-point calibration linear measurement system. And it can be directly applied to the uncertainty evaluation of a single-point calibration linear measurement system. Further, it is expected that MCM will be developed and applied in other linear measurement system, which will promote the study and application of measurement uncertainty to open up new horizons.
Study on Thermal Conductivity of Carbon Fiber / Resin Composite Modified with Graphene Nanoplatelets
Authors: Liu Fangbiao , Wang Danyong , Li Shuhu , Wei Huazhen , Chen Yiwei , Liu Juncong 
Published: August 2020

Abstract
A method for calculating thermal conductivity of graphene/carbon fiber reinforced resin composites (GnP-CFRP) was established basing on the Mori-Tanaka program in the DIGIMAT software. The influence of grapheme nanoplatelets (GnP) on the thermal conductivity of composites has been simulated and experimentally verified. The results show that the thermal conductivity of GnP-CFRP increased with the increase of GnP content, and when the GnP content is too high, the increasing rate of thermal conductivity decreases gradually. In addition, the maximum prediction error of the simulation calculation method in this paper is within 7.27%, which is in good agreement with the actual situation.
Multi-objective optimization and experimental study of the milling parameters of cycloid gear
Authors: Xu JianMin , Gu Lizhi , Luo Shanming 
Published: August 2020

Abstract
To improve production efficiency and reduce machining cost of end milling cycloid gear, a multi-objective milling parameter optimization method which is based on the dynamic characteristics of the machining system is proposed. Using optimized milling parameters for finishing milling cycloid gear, the maximum tool tip deformation is reduced from 0.258μm to 0.092μm by 64.3%, the material removal rate is reduced from 1.56 cm3/mm to 1 cm3/mm by 35.9%, the tool life and the machining accuracy are significantly improved. Effectiveness of the milling parameter optimization model for cycloid gear is verified by milling experiments.
Experimental Research on Milling Temperature of New Cold Saw Blade Milling Cutter
Authors: Shuailiang Guo , Lizhi Gu , Jinling Song 
Published: August 2020

Abstract
Based on the orthogonal test method and comparative study, the effects of workpiece material, workpiece diameter, milling cutter rotational speed and feed per tooth on milling temperature are investigated when cutting metal bars with new cold saw blade milling cutter. Then this paper reveals the change rule of new cold saw blade milling cutter milling temperature and the essential difference from the traditional hot saw blade milling cutter. Construction of sawing metal bar experiment system at production site, four-factor and three-level orthogonal test method is used to cut 45 steel, 40Cr and Q235B metal materials. The influence curves of workpiece material, workpiece diameter, milling cutter rotational speed and feed per tooth on milling temperature are obtained. By normalizing the experimental data, this paper uses the multiple linear regression method to fit the mathematical model of milling temperature. According to simulation analysis and experimental research, the milling temperature change rule of new cold saw blade milling cutter is obtained. Compared with the traditional hot saw blade milling cutter, the results show that under the same or similar conditions, the highest milling temperature center of new cold saw blade milling cutter is located at the bottom of the chip at a certain distance from the tip and the interface of the corresponding cutting layer adjacent to the bottom layer of the chip. The maximum milling temperature is around 300 °C, which is about 175 °C lower than the maximum milling temperature of traditional hot saw blade milling cutter. Further, it demonstrates that most of the heat generated by cold sawing is discharged from the cutting area along with chips, which keeps the milling cutter and workpiece at a relatively low temperature.
Effect of HIP treatment on the microstructure and mechanical properties of a Ni-based superalloy fabricated by selective laser melted method
Authors: Guo Xiaojun , Ling Huixiang , Huang Xiaozhong 
Published: August 2020

Abstract
Selective laser melting (SLM) is one of the most emerging additive manufacturing (AM) method through the melting of metal powder to manufacture the full density parts, which will lead to an orientation microstructure and anisotropy mechanical properties. Thus, corresponding post-processing treatments, such as solution treatment (ST) and hot isostatic pressing (HIP), were subjected to the specimens before tests. The effect of the HIP on the microstructure and mechanical properties of SLM Inconel 625 was investigated through uniaxial tension tests at room and elevated temperature. The fracture mechanism was systematically characterized and analyzed using scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). It was found that the microstructure after the HIP process is composed of equiaxed austenite, and the annealing twins are reduced. The tensile test results reveal that the HIP has a significant impact on the plastic behavior of the alloy at high-temperature, and is the main reason for the greatly improved elongation, compared to the ST process.
Study on dynamic compression behavior and energy absorption characteristics of three negative Poisson’s ratio materials under different velocities
Authors: Wang GuoShu , Liu GuiFeng 
Published: August 2020

Abstract
This paper uses finite element analysis to study the impact dynamics of three negative Poisson’s ratio materials. Different Poisson’s ratio generation mechanisms, deformation modes, and dynamic response characteristics of three materials at different impact speeds are discussed. The unique necking phenomenon, the deformation mode diagram, dynamic response curve, and energy absorption curve are obtained after processing. The results of numerical simulations have deepened our understanding of negative Poisson’s ratio honeycomb materials, and have guiding significance for us to explore new high-performance honeycomb materials later.