bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study on Calculating Method of External Load on Digging Arm of Underground Excavator Truck
Authors: Zheng Shuping , Yang Zengjie , Yang Zhongliang 
Published: March 2020

Abstract
The digging arm of underground excavator truck has many movable joints, complex structure and variable operation properties which results in the complicated loading. So it is difficult to obtain the external working load directly through the test. For this problem, the calculation of the external load on the digging arm of the underground excavator truck is studied by combining test and virtual prototype in this paper. The details include: Firstly, the static test of the digging arm was conducted using pressure sensor and displacement sensor, and the parameters of the virtual prototype built by Motion View software were modified. Then the pressure and displacement curves of each hydraulic oil cylinder are measured during the operation on site. The working process of digging arm is simulated and reconstructed by taking the measured displacement curves of each cylinder as the driving inputs, and outputs the curves of centre of mass coordinate, curves of acceleration and corresponding curves of torque. The rotary torque of external forces and gravity on a rotation axis (rotation axes of movable arm and pitch) should be equal to the sum of torque of the product of each component’s mass and the acceleration of the centre of mass on that point according to the law of torque calculation. Thus, the non-homogeneous linear equations of external loads (horizontal, vertical and lateral loads) are derived under the actual conditions. And external loads were solved by substituting the above curve parameters into the equations. Finally, the obtained external load is reloaded into the virtual prototype of the digging arm to simulate the force of actual digging process. The error is less than 5% by comparing the calculated and test values of the oil cylinders force of rod and bucket and the effective strain error of the movable arm is less than 10%. So the correctness of the derivation method of external load and the dynamic model considering inertial force is verified. It provides theoretical and algorithm support for the next acquisition of load spectrum and fatigue analysis of digging arm.
Shimmy analysis of steering system with independent suspension based on coupled feedback model
Authors: Gao Lulu , Ma Fei , Jin Chun , Liu Yuchao , Li Xinze 
Published: March 2020

Abstract
Shimmy of steering system causes the snaking and deteriorates the handling stability and safety of vehicles, which has not been solved effectively for the ambiguity of shimmy characteristic. In order to uncover the mechanism of shimmy, a 5-DOF dynamic model of the steering system with independent suspension is established, and the coupled feedback model of the steering system is further obtained based on the dynamic model. Then the frequency characteristics of feedback are analysed, and the work and damping energy dissipation of each feedback link in a unit period are calculated. Based on the range of natural frequency and unit periodic energy of steering system, the range of wheel shimmy frequency and velocity interval is determined. The analysis results show that the shimmy frequency is the first natural frequency of steering system. The amplitude of wheel shimmy is calculated based on energy conservation, and the energy transfer of steering system is elaborated. The mechanism of shimmy was uncovered based on the energy transfer of coupled feedback system. The theoretical analysis was verified by numerical simulation. The results provide theoretical support for the mechanism research and active control of shimmy.
Effects of Welding Currents on Microstructure and Properties of 5052 Aluminum Alloy TIG Welded Joint
Authors: Gou Weijie , Wang Lihong 
Published: March 2020

Abstract
To study the influence of welding current on the welding quality of 5052 aluminum alloy TIG welding, the microstructure, mechanical properties and corrosion resistance of the welded joints obtained under different currents from 100 A to 120 A were discussed. The results showed that when the welding current is 100~120 A, with the increases of welding current, the strength of the welded joint (of 5052 aluminum alloy TIG) increases, while the plasticity decreases.
Fatigue Life of the 316L Stainless Steel Based on Dual-parametric Weibull Distribution
Authors: An Ziliang , Wang Ziye , Tang Yifeng , Wang Weixin , Chen Tao 
Published: March 2020

Abstract
In order to investigate the fatigue strength of the 316L stainless steel (316LSS) diffusion welded joint, it is necessary to study the fracture time of the 316L-SS. The fracture time test of the 316L-SS has many problems, such as high cost, long time consumption and little data acquisition. Regarding the issue above, the Weibull distribution method is adopted to process the test data of small sample size in this paper. At the same time, the P-S-N curve of the 316L-SS is established to obtain the relationship between maximum stress and fatigue life under different reliability.
SLP-based Technical Plant Layout Planning and Simulation Analysis
Authors: Xu Xiaorong 
Published: March 2020

Abstract
This paper analyzes the current situation and shortcomings of the assembly and the whole material flow in a technical workshop. Through the process analysis, this paper uses the SLP method to optimize, and combines the data analysis to adjust the unreasonable place, and gives the optimized layout plan. Finally, using Flexsim modeling, the whole process of the program is simulated, and the time-consuming reduction of the whole process is verified.
Study on Mechanical Properties of Natural Rubber by Carbon Black/Graphene/White Carbon Black
Authors: Yu Zhenzhu , Zhang Shaofei , Su Lu , Nan Fei 
Published: March 2020

AbstractGraphene (GE) and white carbon black (SiO2) were added to natural rubber (NR) to partially replace carbon black (CB). The effects of different filling ratios of CB/GE/SiO2 on the mechanical properties of NR were investigated. The data were processed by orthogonal experiment. The results showed that when the mass fraction of CB was 41g, the mass fraction of GE was 4g, and the mass fraction of SiO2 was 1g, the maximum true strain in the mechanical properties of NR was 139.8%. The maximum true stress is 85.695 MPa, and it is indicated that41g CB, 4 g GE, and 1 g SiO2 are added to the NR as the optimum filling ratio.
Influence of Wood Fiber on the Laboratory Road Performance of Recycled Asphalt Pavement (RAP) Asphalt Mixture
Authors: Chen Fang , Xue Jinshun , Yang Zhengxun , Gao Kaikai , Huo Zhiqiang 
Published: March 2020

Abstract
The influence of wood fiber content on the road performance of asphalt mixture with high recycled asphalt pavement (RAP) content was studied based on the Marshall test, high temperature rutting test, low temperature crack resistance test and water stability test. And the optimum wood fiber content in RAP asphalt mixture with high RAP content was recommended. The results show that the dynamic stability and low temperature bending strain of RAP asphalt mixture increased and then decreased with the increase of wood fiber content. When the content of wood fiber is 0.3 %, the road performance of RAP asphalt mixture is the best. Compared with RAP asphalt mixture without wood fiber, the Marshall stability and low temperature flexural tensile strain of RAP asphalt mixture with 0.3% wood fiber increase by 7.1% and 4.6%, respectively, and the high temperature rutting resistance and water stability decreases.
Study on Molding Process of Ether Anhydride Type Polyimide Materials
Authors: Chen Xiaoqi , Wang Zhengzheng , Xu Haoran , Zhou Haijun , Zhou Mengmeng , Li Yantao 
Published: March 2020

Abstract
The main molding process of ether anhydride type polyimide materials which synthesized by the main meterials of pyromellitic dianhydride (PMDA), 3, 3’, 4, 4’-tetracarboxydiphthalic dianhydride (OPDA) and Diamine diphenyl ether (ODA) was researched. The effects of molding temperature, molding time and molding pressure on the tensile properties of molded products were investigated. And the effects of dianhydride ratio on the properties and molding process of ether anhydr ide type polyimide materials was discussed. Results showed that samples molded by polyimide molding powder appeared the best comprehensive performance when the molar ratio of PMDA and OPDA was 2:1, with the tensile strength of 93.5 MPa, the elongation at break of 10.1%, the vitrification transition temperature of 340 °C and the thermal decomposition temperature of 5% was 574 °C. And molding process is under that the molding temperature is 410°C, the molding pressure is 4.0Mpa and the molding time is 15min.
Microstructures and Mechanical Properties of a new high entropy alloy
Authors: Chen Mingju , Yang Jing 
Published: March 2020

Abstract
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Structural optimization design of crane frame for nuclear power waste
Authors: Zhang Yu , Jiang Yong , Gong Yajun , Zeng Baoping 
Published: March 2020

Abstract
The structural stiffness and strength are the basis to ensure the performance of nuclear power waste crane. The structural topology optimization method is an effective method to ensure the structural performance of nuclear power waste crane in the conceptual design stage. In this paper, the topology optimization method is used to establish the finite element topology optimization model of the nuclear waste crane frame, and the structure optimization design is carried out. The optimization results are verified by the finite element method, which proves the effectiveness of the method.
Application of finite element method in strength analysis of ship connecting parts
Authors: Liu Yiou , Wu Zhengjiang , Gong Yajun , Xiang Chao 
Published: March 2020

Abstract
In the design stage, the strength and rigidity of general marine connectors can be calculated according to the relevant ship standard. However, some special nonstandard connections cannot be calculated by ship standard. The finite element method provides us another feasible option. In this paper, the finite element method is used to analyze the strength of the ship connecting flange, and the results are compared with the calculation results of the ship standard.
Effects of plasma treatment pressure on Aramid fiber III/BMI composite humidity resistance properties
Authors: Cui Jinyuan , Wang Jing , Jia Song , Wang Yu , Long Cheng , Kong Yida 
Published: March 2020

Abstract
The effects of oxygen plasma treatment pressure on Aramid Fiber III chemical structure and its reinforced bismaleimides (BMI) composite humidity resistance properties were investigated. The aramid fiber III chemical structure under different plasma treatment pressure were measured by FTIR. The composite interlaninar shear strength with different plasma treatment pressure before and after absorption water were tested by short-beam bending test method, respectively. The FTIR results showed that oxygen plasma treatment didn’t change the fiber bulk chemical structure. The composite humidity resistance of interlanimar shear strength was enhanced after plasma treatment. The retention rate of composite interlanimar shear strength was above 95%.
The study of spacing influence on the performance of Contra-Rotation-Propeller in stratospheric airship
Authors: Xie Cong , Tao Guoquan , Wu Zhe 
Published: March 2020

AbstractAccording to the requirements of a foreign high-altitude airship project, the Single-Rotation-Propeller (SRP) was designed under the maximum endurance factor criterion. The spacing influence on the Contra-Rotation-Propeller (CRP) was studied by numerical simulation analysis, the performance of front and rear propeller was compared with SRP. The result indicated that CRP was more efficient than SPR, the CRP has enormous potential in enhancing the aerodynamic performance.
Calculation on Refloating a damaged ship with salvage pontoon
Authors: Pan Dewei , Sun Yuqiang , Zhou Zhaoxin , Zhao Kangdi , Chen Yancai 
Published: March 2020

Abstract
Refloating a damaged ship with salvage pontoon can be very complicated. In the calculation process of traditional pontoon salvage for shipwrecks, the calculation of inflation time, analysis of pontoon motion and intelligent control are mainly studied. When the pontoon is inflated, the volume of gas in the pontoon will change with the change of time and temperature, which will affect the accuracy of salvage measurement. In this paper, According to the theory of heat conduction, a mathematical model of gas volume in pontoon varying with time and temperature is established, which is beneficial to getting the buoyancy and stability of ships.Through the simulation, the refloating process of a damaged ship with salvage pontoon was researched. Computation result shows that shipwreck with many pontoons sunk in the water totally of the preliminary stage, since the stability of the shipwreck is poor, the aeration rate in the pontoon should be calculated accurately to prevent the capsizing of the ship. As the draft of the wreck decreases, the stability of the hull increases gradually, which is beneficial to the process of lifting and floating. The change of pitch angle is small in the course of buoyancy, but it has obvious influence on the buoyancy distribution of ship hull. The position of pontoon has a great influence on the distribution of shear force and bending moment of ship hull. Relevant measures should be taken to reduce the damage to ship hull in the course of buoyancy.
Finite element analysis of building block ark Strength Analysis and Design of Building Block Ark Based on Finite Element
Authors: Li Hongyan , Wang Yu 
Published: March 2020

Abstract
The research on the building block ark can be divided into two key issues: first, the hydrodynamic performance analysis of the building block ark, the main content is to study the hull shape and main scale of the building block ark. The second is the square of blocks.The strength analysis of the boat is mainly to study the overall structure and local strength of the building block ark. This article will explore the Lord.The content is the structural strength analysis of building block ark.
Research and design of CSA-510 color analyzer
Authors: Hu Yunlong , Jiang Yingjie , Li Wenzhong , Yao Jun 
Published: March 2020

Abstract
This paper introduces the measurement principle of color analyzer firstly, and designs a kind detection equipment of color analyzer which can be used for accurate measurement and analysis of color, An experimental comparative study was carried out with foreign mature product CA-310 at last. The results show that When the brightness is greater ⩾ 0.1cd/m2, the results of brightness test keep a linear relationship, and the range of error with competitor brightness is less than 2%. The error range of color coordinate accuracy is basically controlled within ±0.0050. Compared to the high prices of abroad equipment, it has certain competitive advantages.
Study on Wear Performance of GS-18NiMoCr36/42CrMo Friction Pair
Authors: Xu Guo , Chen Bo , Feng Kun , Zhang Dongya , Zhu Pengxiao 
Published: March 2020

Abstract
GS-18NiMoCr36 steel was used to prepare fixed pin with different hardness. The rotating ring with hardness of 53HRC was prepared by 42CrMo steel. Under the different load conditions, MR-H3B high-speed ring on block wear tester was used to study the influence of different hardness matching friction pair wear performance. The results show that with the increase of load, the weight loss of wear has the law of increasing-decreasing-increasing. The form of wear is oxidation wear - adhesive wear -oxidation wear - adhesive wear. As the hardness of the fixed pin increases, the weight loss of wear tends to decrease, and the hardness of the material can be improved within a certain hardness range, which can significantly improve the wear resistance.
Optimization of a cantilever steel frame structure of bottom platform by finite element method
Authors: Sun Weihai , Ju Guiling , Ju Limei , Pan Jingwen 
Published: March 2020

Abstract
The finite element analysis of a cantilever steel frame structure of the bottom platform in civil engineering is carried out. Based on ANSYS and the basic characteristics of steel frame structure, parametric modelling is carried out, and the stress and deformation of the structure under extreme load conditions are analysed. The first-order optimization algorithm is used to optimize the beam cross-section size, which significantly reduces the total weight of the structure, thus providing a basis for the optimal design of the engineering structure.
Research on the Integration of Industrial Design and Mechanical Product Design
Authors: Zhang Lijuan , Yang Qin , Zhang Kewei , Liu Jiayue , Feng Caicai , Hou Wen , He Xin 
Published: March 2020

Abstract
The purpose of this paper is to integrate industrial design into mechanical design, improve the core competitiveness of mechanical products, and become a benign development path for the transformation and upgrading of traditional machinery enterprises. To provide perfect and feasible ideas, theories and concrete methods and means for traditional enterprises; Through the research and analysis of the present situation of the development of traditional machinery industry, this paper finds out a series of problems existing in the upgrading and transformation of traditional manufacturing industry in the emerging stage, combined with the core ideas of informatization and industrialization under the background of industrial design 4.0, taking Anshan old industrial base as an example. An innovative development model suitable for the integration of industrial design and regional machinery manufacturing industry is developed. Relying on the platform of Anshan Industrial Design Center, the development model of “industrial design industrial alliance + association + university” led by the government is established. And take the industrial design public service as the support, adjust measures to the local conditions. Focusing on “public service, platform construction, design competition, talent training, publicity and promotion, brand activities, standard formulation, basic research” and other aspects, to achieve the integration of new industrial design industry ecological model of machinery manufacturing industry.
Microstructure Evolution Simulation of GH4169 Fasteners in Forging Process
Authors: Wang Yanju , Jiang Jiaying , Wang Tao , Yang Yukai , Sha Aixue , Li Xingwu 
Published: March 2020

Abstract
This paper mainly calculated the microstructure evolution characteristics of GH4169 alloy fasteners during hot forging deformation. The constitutive equation and the microstructure evolution models of the material were embedded in the finite element software. By analysis, the grain size and dynamic recrystallization volume fraction were calculated, and the key points on the fastener in forging process were analyzed. As a result, the microstructure evolution of the GH4169 alloy fastener during the hot forging deformation process was obtained. The results show that, through the plastic deformation by the hot forging process, the grain size on the fastener’s head is gradually refined, the minimum average grain size is reduced from the initial 100μm to less than 10μm. During the deformation process, the splinted part of the fastener begins to undergo dynamic recrystallization first. After that, dynamic recrystallization volume fraction gradually increases from the central region to the edge, with the highest value of 60%. These results provide a basic data reference for GH4169 fastener forging process development and parameters optimization.
Comparative analysis of the fracture splitting deformation of the big end for C70S6, 36MnVS4 and 46MnVS5 connecting rods
Authors: Liu Jingsha , Kou Shuqing , He Dongye 
Published: March 2020

Abstract
During the fracture splitting process of the connecting rod, the plastic deformation, especially the plastic deformation before cracking, not only causes the big end hole of the connecting rod to be out of roundness, but also increases the residual stress, affecting the assembly precision and even the service life of the connecting rod. In this paper, the mechanical properties of microalloyed steel C70S6, 36MnVS4 and 46MnVS5 connecting rod were determined by tensile test. The displacement field, plastic strain and the deformation principle of the big end before the crack initiation of the fracture splitting of the connecting rod were numerically simulated. The results show that the yield strength, tensile strength and plasticity index of the new medium carbon microalloyed steels 46MnVS5 and 36MnVS4 are significantly higher than those of C70S6. However, the C70S6 connecting rod has a long loading time before crack initiation, and the plastic deformation area of the groove root front is large and the strain is high. The plastic deformation of 36MnVS4 and 46MnVS5 connecting rods is small and the area is concentrated. Among the three, the 46MnVS5 connecting rod has the smallest deformation and the C70S6 connecting rod has the largest deformation.
Analysis of Pavement Mechanical Properties under Different Parameters of Asphalt Materials
Authors: Feng Liu , Hao Li , Gui Liu , Yong Zhou 
Published: March 2020

Abstract
In view of the differences between the 2006 Chinese version of the asphalt pavement design specification and the 2017 version of the asphalt pavement design specification, taking the road structure of Renxin Expressway in Guangdong Province as an example, the finite element analysis method was used to establish the finite element model of the road structure. The mechanical response of asphalt pavement with different surface materials is analyzed. Then the mechanical response of asphalt pavement to asphalt pavement structure with different thickness is analyzed under the condition that the asphalt pavement remains unchanged in both the base layer and the subgrade. Finally, according to the above analysis results, the problems that need attention in asphalt pavement design are obtained.
Fatigue crack path and propagation rate at weld root in cruciform joint
Authors: Shlepetinskiy A Y , Manzhula K P , Saveliev A G 
Published: March 2020

Abstract
The results of experimental research of the path and propagation rate of fatigue cracks in cruciform welded joint with a lack of fusion are presented. It is shown that the cracks are initiated at and propagates from the all non-fused weld root faces. Experimental results are compared with the data of computer simulation in Ansys, and with numerical calculations of fatigue life using the received equations of stress intensity factors at the weld root.