bluuebunny/crossref_metadata_2025_split huggingface dataset:
Determination of solidification end position of continues cast slab based on force model
Authors: Lang Rui , Dang Jian , Zhang Qi , Guo Yansong , Shi Xueliang 
Published: October 2019

Abstract
For a better determination of solidification end position during the process of soft reduction to confirm the reasonable reduction position and reduction area and to get the better slab quality, by analyzing the force behaviour of slab shell during soft reduction process, a force dynamic determination model for the end position of liquid core of slab during soft reduction process has been built. The variation trend of reaction force and total pressure of segment clamping-roller with the changing of position of solidification end can be got by the using of model calculation, and by analyzing this trend, a force feedback-based model has been proposed for checking the end position of liquid core. The veracity of the force feedback-based model has been verified by using nail-shooting approach.
Research on hilly mountain tractor based on adaptive
Authors: Shao Mingxi , Zhang Xiumei , Xin Zhe 
Published: October 2019

Abstract
Finite element method is an effective numerical analysis method developed to adapt to the use of computer [1]. Its role in engineering practice has been extended from analysis and verification to optimization design, and it has become a computer aided by computer aided design (CAD) Engineering (CAE) an important part. With the increasing complexity of engineering practice problems, the application of finite element method and error analysis method in one of the adaptive finite element method is becoming more and more popular. The adaptive finite element mesh which reflects the physical and geometric characteristics of the structure is the necessary part of applying the adaptive finite element method. With the trend of the development of tractors in the direction of intelligent, lightweight, the application of electronic technology and micro-control technology to tractors is an inevitable way. In this paper, based on the traditional tractor hydraulic suspension system, a tractor system with force adjustment function is designed. Compared with the traditional tractor hydraulic suspension system, the system uses the electronic control technology to realize the deep displacement adjustment and force regulation, control the chip acquisition force sensor and the position sensor real-time feedback signal to raise or lower the hanging rod. Introduction.
Application of anti-eccentric open hydrostatic guideway in vertical lathe
Authors: Zhang Wenwu , Han Liang , Qian Lin 
Published: October 2019

Abstract
This paper introduces an open hydrostatic guideway with anti-eccentric load structure for vertical lathe. This hydrostatic guide adopts swing plate fee-dback throttling oil supply system. The structure improves the angular stiffness of the open hydrostatic guide rail of vertical lathe, ensures the stability of the worktable in a wide range of eccentric loads, and meets the requirements of high precision machining of eccentric loaded parts.
Experiments on a crane overspeed protection device
Authors: Zheng Wei , Zhao Yongpan , Weng Yiyong , Duan Xing , Jin Haibin 
Published: October 2019

Abstract
A crane overspeed protection device can quickly control the movement of the lifting rope and drum when the load of the crane overspeed, which can prevent the phenomenon that the lifting rope and drum are subjected to gravity and then continue to move under impulse, and effectively improve the braking efficiency of the lifting rope and drum.
Research on importance evaluation of NC machine tool working loads based on AHP-fuzzy comprehensive evaluation method
Authors: Li Guofa , Zhu Hongxiang , Wang Jili , Zhang Xinge , Huo Yongchao , Yang Haiji 
Published: October 2019

Abstract
The NC machine tool are subjected to a variety of working load during the actual machining process. The influence of different kinds of working loads on the NC machine tool’s reliability level are different. Therefore, this paper proposes an importance evaluation method of NC machine tool working loads based on analytic hierarchy process (AHP) -fuzzy comprehensive evaluation to judge the influence of different kinds of working loads on the reliability level. Firstly, the hierarchical structure of the importance evaluation of NC machine tool working loads is established, and then the structure of discrimination matrix and the consistency test of the matrix are determined. Secondly, the fuzzy membership R of the fuzzy subset is established, and then the weight vector M of the evaluation factor and the evaluation result vector S of the fuzzy comprehensive evaluation are determined to realize the quantitative analysis of the fuzzy object. Finally, the importance of calculating the machining center load is ranked as cutting force, feed rate, torque, tool changing frequency, temperature and noise in the example.
Design of mechanical arm based on piston fire rescue and emergency lock system in public places
Authors: Ma Yuan , Tang Bo , Ma Xu , Chen Yuxiao , Wang Yong , Zhang Ziqi , Liu Lu 
Published: October 2019

Abstract
In recent years, emergency have occurred in public place, especially fire, such as the Xinyi City Yiyuan Song and Dance Hall in Liaoning, and the Karamay Friendship Hall in Xinjiang, Henan Jiaozuo City Paradise Audio and Video Club. The common lesson is that the security channel is blocked by the security door and the security net, and the security exit is closed, causing people to escape without a door when the fire occurs, causing heavy casualties. Again and again, firefighting and rescue, all must first remove the security door, iron fence window to rescue the trapped people, missed the best time to extinguish the fire. In order to solve the problem of unimpeded safety exits, it is necessary to solve the problem of consistency between normal use management and fire safety. It is difficult to be effective only by administrative means, and technical measures must be taken to solve the problem of safety dredging. Small-scale hotels, Internet cafes, etc. without fire or security systems must be able to push open the emergency exit door, but an alarm will be generated locally when the door is opened during normal working hours. The emergency exit door of an emergency gathering place such as a large-scale hotel, an Internet cafe, a dance hall, a hotel, a department store, etc., which is connected by a fire-fighting linkage system or an anti-theft alarm linkage system, must be pushed open, but will open when the door is opened during normal working hours. Local alarms are generated, so it is especially important to design a security door that can automatically unlock when an emergency occurs in a public place.
Application of Polymer Materials with High Mechanical Properties in Competitive Sports
Authors: Tong Yibao 
Published: October 2019

Abstract
competitive sports is a sport that pursues higher, faster, stronger and more accurate sports goals. It is a sport that challenges the limits of individual athletes and even human sports. A polymer material with high mechanical properties, such as strength, elasticity and toughness. In this paper, the application of polymer materials with high mechanical properties in competitive sports was studied.
Analysis on the Developing Situation of CHINA RAILWAY Express
Authors: Zhang Zhijia , Li Xiaohong , Zhang Zhiwei 
Published: October 2019

Abstract
With the further implementation of the Belt and Road Initiative, the economic trade and exchanges between China and Europe, also including countries along the routes, have developed rapidly, resulting in a growing demand for the logistics. In this context, CR Express is developed. However, its rapid growth highlights many problems. In this paper, the current operating situation of CR Express is analyzed firstly, including the quantity, area of operation and type of goods. Then, analysis on the main problems of the operation is carried out from different aspects, especially the organization of goods source, loading technologies of container and facilities and equipment. Finally, concrete countermeasures are put forward to improve the operation of CR Express.
Comparison of equivalent model methods of joint surface based on modal analysis
Authors: Han Renxiu , Li Guoxi , Gong Jingzhong , Zhang Meng , Zhang Kai 
Published: October 2019

Abstract
The mechanical joint surface plays an important role in transmitting motion, load and energy during the normal operation of the mechanical system. Effective mechanical joint equivalent models are established to solve the practical problem of the dynamic model engineering. Equivalent models of joint surface in this study include spring damping method, virtual material method and Bond connection method. Firstly, the model is established by CATIA. Secondly, the physical properties of the model are assigned by ANSYS or Abaqus finite element simulation software. Then the modal analysis of the model carries out. By comparing the mode shapes and natural frequencies of the three methods, it is concluded that the mode shapes of the three methods are basically the same. Therefore, all three methods are reliable joint surface equivalent models. However, the natural frequency obtained by the virtual material method is significantly lower than the natural frequencies obtained by the other two methods. It is concluded by analysis that the natural frequency error obtained by the virtual material method is small, and the spring damping method and the finite element method have large errors.
Secondary electron emissive thin film fabricated by atomic layer deposition
Authors: Lin Yanjian , Gu Yunting , Yan Baojun , Liu Shulin , Wen Kaile , Wang Yuman , Heng Yuekun 
Published: October 2019

Abstract
The secondary electron emissive alumina thin film was fabricated by atomic layer deposition (ALD). The film thickness, structure and composition were characterized by Spectroscopic Ellipsometry (SE), X-ray Diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. The secondary electron yield (σ) of the sample was measured by pulsed electron beam method and the influences of primary electron energy and primary electron angle on the σ have been investigated.
Modal analysis and optimization of the main frame of a spherical stable platform
Authors: Xue Shan , Liu Zhengbin , Guo Jianbo , Zhang Zhen , Lv Qiongying 
Published: October 2019

Abstract
The frame of spherical stabilized platform is the main part and the key component. The initial main frame of a spherical stabilized platform is designed. In order to make the main frame of a spherical stable platform lighter and more rigid, the improved design is carried out. The SolidWorks software is used to conduct 3d model for the initial design and the improved design, and to compare the quality of the two designs. The finite element model of the two designs is carried out by using ANSYS software, and then the modal analysis is carried out to obtain the first natural frequency of the main frame. The comparison results show that the improved design is lighter than the initial design, the first-order natural frequency is improved, the corresponding stiffness is greatly improved, and the resonance does not occur in the frequency range of 80Hz ∼ 160Hz, which meets the design requirements. Finally, the improved four-jaw design is adopted to provide a reference for similar platform design.
Changes of Alkali Metal Ions and Alkaline Earth Metal Ions on The Surface of Lead Silicate Glasses
Authors: Jia Jinsheng , Zhang Yang , Zhang Xian , Sun Yong , Wang Yun , Zhang Lei , Liu Juan , Wang Chen , Yu Haoyang 
Published: October 2019

Abstract
Lead silicate glasses are currently the most employed glasses for microchannel plates (MCP) and other applications. X-ray photoelectron spectroscopy was used to determine the changes of alkali metal ions and alkaline earth metal ions on glasses surface during hydrogen reduction. The results showed that the chemical states of alkali metal ions and alkaline earth metal ions did not change. However, the content of these metal ions increases, which is beneficial to secondary electron emission yield of lead silicate glasses and the gain of MCPs.
Surface Compositional Studies of Mircochannel Plates During Hydrogen Reduction by XPS
Authors: Jia Jinsheng , Zhang Yang , Sun Yong , Zhang Xian , Wang Yun , Zhang Lei , Liu Juan , Wang Chen , Fan Zhiheng 
Published: October 2019

Abstract
Lead silicate glasses are currently the most employed glasses for microchannel plates (MCP) and other applications. X-ray photoelectron spectroscopy was used to determine the distribution and variation of surface composition of lead silicate glasses during hydrogen reduction. The results showed that the binding energy of silicon, sodium, potassium, magnesium, barium and cesium did not change. However, the content of metal elements is gradually increased increases, while the alkali metal ions and alkaline earth metal ions migrate to the surface. At the same time, the bridge oxygen and non-bridge oxygen content also changed. All the changes of valence and content of elements on glass surface eventually lead to the change of electrical properties of MCPs.
Electro catalytic Performance of bimetallic LDH on Mxene Adsorbed Nickle Foam
Authors: Zhang Ruya , Zhou Yang , Yue Qin , Kang Yijin 
Published: October 2019

Abstract
Mxene is a typical two-dimension material which have widely applied in many fields. Following the design strategy of electrostatic adsorption, coupled with bimetallic LDH, the layered Mxene is successfully used in electrochemical system. A large number of negative groups on the surface of Mxene are used to let Mxene monolayer adsorb on self-supporting materials. The comparison of the electrocatalytic performance before and after the adsorption of Mxene showed that a small amount of absorbed Mxene did have the effect on the reaction activity. The different bimetallic LDH synthesised by hydrothermal method was supported on this new material NF@Mxene. After exploring various combinations, the NF@Mxene with NiFe LDH was proved to be the best OER catalyst. This strategy will provide possibilities for subsequent Mxene electrocatalytic applications.
Effect of TiB2 on Properties of TiAl-based Alloy
Authors: Yan Bin , Yang Liying , Sun Zheng , Wang Qimeng 
Published: October 2019

Abstract
In this paper, we added particle reinforced phase TiB2 in TiAl-based composites, TiB2/TiAl matrix composites were prepared by using powder metallurgy vacuum hot pressing sintering technology, and the effects of TiB2 particle reinforced phase on the mechanical and tribological properties of TiAl-based alloy were studied. It was found that the hardness and density of TiAl-based alloy composites increased with the addition of TiB2, the friction coefficient and the wear loss decreased with the increase of TiB2 content in TiAl-based alloy. The wear resistance of TiAl-based alloy can be improved by adding TiB2 particles.
Modeling of Precision Machining for Crankshaft Follow-up Grinder
Authors: Wu Changjun , Fan Jinwei , Zhang Yiling , Zhao Yuanyuan 
Published: October 2019

Abstract
In this paper, follow-up grinding of crankshaft is studied and the mathematical model of follow-up grinding motion is established. Taking the double grinding wheel crankshaft follow-up grinder as the research object, the motion errors of the machine tool are obtained by analyzing the motion relations among the moving bodies. Based on the kinematics theory of multi-body system, the kinematics model of the whole machine tool is established. The position matrix of any cutting point is described according to the kinematic chain of “bed-workpiece” and “bed-tool”, and the precise machining model of double grinding wheel follow-up grinding machine tool is established by using the coincidence principle of tool actual trajectory and tool path. The coordinate system of each moving body is established, the transformation matrix between moving bodies is obtained, and the precision machining model of double grinding wheel follow-up crankshaft CNC grinding machine is solved, which lays a foundation for error compensation of the machine.
Research on Error Modeling and Identification Technology of CNC Camshaft Grinder
Authors: Tao Haohao , Fan Jinwei , Jia Xin , Yin Jian , Qi Guochao 
Published: October 2019

Abstract
Taking certain type of CNC camshaft grinders as the research object, through the analysis of its structure and movement to determine a total of 21 error parameters, a model describing the motion relations between adjacent body coordinate systems containing the error parameters was established. The machine movements were classified into two kinematic chains: the “bed-workpiece” and “bed-tool”. The topological structure of the machine tool was built and then the multi-body system theory was applied to model the errors of the machine tool. Body coordinate systems and motion reference coordinate systems were set up on each moving body and the corresponding transformation matrix was derived by joining the motion relation models between adjacent body coordinate systems. In order to achieve precision machining in the case of the existence of influential errors, a constraint equation Pw = Pt was put forward and solved. A mathematical model of the X-C axis linkage during camshaft grinding was proposed to work out the grinding point coordinates in the workpiece coordinate system and tool coordinate system. Three kinds of measurement methods were provided to identify 15 error parameters affecting the camshaft machining by using a cue instrument, which provides necessary conditions to research the machine tool error compensation.
An Improved SIFT Algorithm for Monocular Vision Positioning
Authors: Niu Xinyue , Pu Jiexin , Zhang Chi 
Published: October 2019

Abstract
In view of the high real-time and accuracy requirements of the monocular hand-eye vision system in the positioning process, and in the case that the existing image matching algorithm can not meet these two requirements well at the same time, this paper improves the SIFT feature matching algorithm based on local features. First, the corner points determined in the Harris operator are used instead of the key points determined by the SIFT algorithm as feature points in the template image and the image to be matched. Then, a 32-dimensional feature description vector is constructed for each of the selected feature points through a Gaussian circular window. In the registration phase, the Euclidean distance is used as a measure function to match the 32-dimensional feature descriptors. Finally, 100 template images acquired by the monocular hand-eye vision experimental platform are used to test the matching effect of the improved SIFT algorithm, which proves that the improved algorithm has higher improvement in matching time and registration accuracy than the original algorithm. It is applicable to image registration for monocular vision positioning in industrial practice.
Design and application of automated mechanical arm and intelligent transport vehicle
Authors: Guo Xingqi , Zhu Zhiyuan , Yan Dongmei 
Published: October 2019

Abstract
At present, the constant development of industrialization has ushered in a wide use of vehicle-mounted mechanical arms in all walks of life. Yet there are still some deficiencies, such as large load, low intensity, poor efficiency, etc. In such case, an armtype automated transport system is designed to improve its dynamic performance. The multi-degree-of-freedom mechanical arm is used as the mechanical structure to realize loading and unloading and the single-chip microcomputer is used as the main controller. Loading and unloading can be realized through smooth and flexible movements and the motion control of mechanical arm and automated transport vehicle is achieved through Raspberry Pi. The traditional mechanical arms are optimized in their structure and precision to increase their precision and enable them to meet different system requirements with applicability, economy, robustness and scalability.
A Stair-clamping Wheelchair for Elder People Based on Compound Structure
Authors: Fang Zhijin 
Published: October 2019

Abstract
In China, there is still a lot of the buildings which are without elevator, meaning that the floors can only be accessed by walking up and down stairs. It is slow, time-consuming and energy-consuming. At the same time, due to social enhancement like rising life expectancy, population aging has become a common phenomenon in majority regions of China. As there are more old people in the residential system, the challenge of climbing staircases is beginning to be considered as a potential social issue. Indeed, it is easy to find a stair-climbing wheelchair on the market nowadays, but not much device is able to provide the proper help for the majority of old ones who suffer through a daily double challenge of carrying some heavyweights from the vegetable markets and climbing the stair just to access residents. At present, the stair-climbing mobility has already been developed for several years, and there are a lot of different mechanical structures with different features. My design attains the maximized efficiency of stair-climbing and is able to consistently maintain the weights in the box structure always horizontal relative to the ground, under a device-body angle self-adjusting system. And it is able to do the job stably and efficiently, it will further facilitate the elders’ lives.
Design and characteristic analysis of a four-claw spherical photoelectric stabilization platform
Authors: Xue Shan , Lv Nanfang , Meng Xianyu , Liu Zhengbin , Guo Jianbo 
Published: October 2019

Abstract
Airborne photoelectric stabilization platform is an important tracking and scanning equipment. In order to make the photoelectric stabilization platform smaller and lighter, a four-claw spherical photoelectric stabilization platform is proposed. The four-claw spherical photoelectric stabilization platform is driven by piezoelectric motors with parallel structure. SolidWorks software is used to build the three-dimensional model of the stabilized platform. After reasonable simplification, the finite element model is built in ANSYS software. Comparing different mesh generation methods in the process of establishing finite element model, the mesh distortion is reduced from 0.74 to 0.38 by changing the mesh correlation and refinement. Different materials are used to design the platform, and the mass of the platform under different materials is compared. The platform mass of the new material is 30.3% and 66.4% less than that of the other two materials. The static characteristics of the platform with new materials are analyzed, and the maximum deformation and stress of the platform are analyzed. The results show that the designed airborne spherical photoelectric stabilized platform with new materials meets the requirements of stiffness and strength, which provides a reference for the design of such platform.
Generalized mechanics of flexure hinges for unified simulations
Authors: Xu Siqiang , Liu Pinkuan 
Published: October 2019

Abstract
Flexure hinges are widely introduced into precision mechanisms to perform the smooth motion without backlash and friction. In this paper, a generalized beam element based on the weak form quadrature element method is proposed to assess the compliances of the flexure hinges with different profiles. The flexure hinge is regarded as the Timoshenko beam taking the shearing effect into account. The elemental stiffness matrix is obtained with solution of algebraic equations and the explicit mesh structure is not required for compliance modelling of the flexure hinge with an arbitrary profile. The compliances of two typical types of flexure hinges are computed based on the proposed element. The results are compared with ones yielded by analytical equations. Then the high accuracy and effectiveness of the proposed element are validated.