bluuebunny/crossref_metadata_2025 huggingface dataset:
Finite element analysis of new energy vehicle scroll compressor shell under working pressure
Authors: Hu Shunan , Tang Mengyi , Ge Dawei , Guo Huaming
Published: October 2019

The interference design between the mating surface of shell and retainer in new energy vehicle scroll compressor were important parts of the design of the shell assembly. The finite element analysis of static structure was used to analyze the strength of shell and the deformation value of the mating surface under the working pressure, and minimum surplus were used to analyze whether the matching surface surplus design meet the design requirements. An analytical method was provided for the design of new energy automobile scroll compressor shell by static structure analysis of shell and the interference of mating surface.
Trial Production of Stainless Steel Cladding Rebar by Liquidsolid Casting and Hot Rolling Method
Authors: Liu Xuming , Feng Guanghong , Liu Xin , Wang Baoshan , Zhang Hongliang
Published: October 2019

In the present investigation, liquid-solid casting and hot rolling method was successfully used to manufacture stainless steel cladding (SSC) rebar. Stainless square tube that was surface treated by pellet blasting treatment was preheated to 1100 °C, and then liquid carbon steel which was heating up by induction furnace to 1620 °C was filled into the tube to cast the SSC billet. SSC billet was rolled in a wire and rod plant successfully due to metallurgical bond state between the tube and carbon steel. Soaking temperature and starting rolling temperature as well as finishing rolling temperature were exhibited 1180C, 1130C and 1000C. Uniaxial tensile testing of SSC rebar at room temperature exhibited an extremely yield strength of 433 MPa and a tensile strength of 599 MPa, while the elongation reached 24%. Positive and negative bending experiment showed no cracks during the deformation. Through metallographic analysis, it was found that the base structure of stainless steel was ferrite, and heterogeneous phases such as martensite and ferrite was discovered near the interface of carbon steel and stainless steel.
Multidimensional Data Management System for Spacecraft AIT Process Based on Product Structure
Authors: Wei Peng , Zhao Jingjing , Yang Xiaoning , Zhang Liwei , He Wenxing
Published: October 2019

In order to solve the problems such as poor integration and application of the data in spacecraft AIT process, this manuscript analyzes the evolution of AIT process data in three dimensions: product structure, time period and development stage from the aspects of data model construction and data integration. We built a multidimensional data model and developed a multidimensional data management system based on product structure. This system takes the product structure as the core, organizes the AIT process data, defines the correlation relationship between different systems and different dimensions, realizes the structured integration of the whole data of AIT process, and generates the AIT process packet.
Non-interactive object extraction based on saliency detection
Authors: Pa Ting , Wang Xuan , Liu Shouxun
Published: October 2019

In traditional content-based image retrieval (CBIR), it is very important to segment the regions of interest for retrieval. In order to realize the non-interactive target region segmentation, this paper proposes the object segmentation based on significance region detection. The Grab Cut segmentation algorithm is initialized through the detection of the significance region, and the interactive operation is removed. The segmentation precision of the algorithm proposed in this paper is 89.51%.
Silicon Carbide Material and Railway Electrical traction Innovation
Authors: He Anqi
Published: October 2019

With the development of new materials and new energy industries, power devices have also made great progress. Compared with traditional silicon-based power electronic devices, wide-band gap semiconductor devices based on silicon carbide which are considered to be an important alternative to silicon-based devices, have excellent properties such as high breakdown voltage, thermal conductivity, and electron saturation drift and radiation resistance. At the same time, power electronic devices are widely used in high-speed railway. The application of a new type of silicon carbide power device in electrical traction is discussed. The experiment of system characteristics shows that the power device made of silicon carbide can effectively reduce the power loss of the system, adapt to the bad working conditions, and make the equipment lightweight.
Development of Temperature-controlled and Humidity-controlled three-body Abrasive Wear Testing Machine based on MLD-10 Dynamic Abrasive Wear Testing Machine
Authors: Bai Heda , LI Ang , Quan Wei
Published: October 2019

In order to simulate engineering machinery (such as mining machinery, feed pellet machine, building machinery and so on), which existence of different degrees of high temperature and humid corrosion three-body abrasive wear behavior in the laboratory environment. In view of the current three-body abrasive wear testing machine cannot simultaneously take into account the composite conditions characteristics of the three-body abrasive wear behaviour, high temperature and humidity, and make the optimization design, based on the MLD-10 dynamic abrasive wear tester. It includes corrosion and wear groove, fluid medium, temperature measuring and controlling device, stirring device, etc. A three-body abrasive wear testing Machine that can control temperature and humidity. Subsequently, the simulated working condition test of the ring die of feed pellet machine were carried out. The test results show that the wear appearance of the test sample is basically consistent with that of the real ring die of feed pellet machine. It indicates that the developed testing machine can simulate the high temperature and humid three-body abrasive wear behavior, and has good reliability and applicability.
Fabrication of Superhydrophobic Surface on Stainless Steel Meshes for Oil-Water Separation
Authors: Wang Xiaohui , Han Zhuo , Huang Shan
Published: October 2019

In this paper, a superhydrophobic surface for oil-water separation were fabricated by grafting polymer on 3D hierarchical polydopamine-graphene (PDA-graphene) aerogel modified stainless steel mesh (SSM). The chemical compositions and surface morphology of the as-prepared composite were characterized by HNMR, FTIR and SEM. The results show that polymer/PDA-graphene/SSM exhibits unique interfacial properities, including hierarchically porous structure, large specific surface area, hydrophilicity and oleophobicity, hence it could work as excellent oil-water separation material. Oil-water separation experiments indicate that the average water permeation of the film is 1155 L h-1m-2bar-1, and the separation efficiency is 99.1%, which identifying the excellent performance of polymer/PDA-graphene/SSM.
Construction of contact force prediction model for cushion cylinder based on simulation and response surface method
Authors: Bao Zhongfu , Zeng Dejiang
Published: October 2019

Cushion cylinder is often used to alleviate collision in pneumatic manipulators. The pneumatic cushion circuit is a complex system, so it is difficult to calculate the contact force accurately. In order to solve this problem, the virtual experiment is carried out by digital simulation based on experimental design and response surface method, and the contact force prediction model of cushion cylinder is obtained by analyzing the experimental data.
Cooperation mode optimization between two clutches for dual clutch transmission during the torque phase
Authors: Zhang Jing , Zhou Ruyi , Li Xinyi , Liu Jikai , Xing Qingkun , Tang Pei
Published: October 2019

The study focuses on the control method optimization for the Dual Clutch Transmission upshift process during the torque phase. The upshift process and two power flow paths are analyzed in detail. According to the analysis results, if two clutches slip together during the DCT upshift process, either torque hole or power circulation generates. To avoid these two conditions, the torque relationship between two clutches is optimized to enable the off-going clutch to disengage without slippage. The Matlab/Simulink platform is used to establish the DCT dynamic model. The obtained simulation results illustrate that, compared with the control methods based on two clutches slippage, the optimized one can not only avoid torque hole and power circulation, but achieve the highest system efficiency during the torque phase, which means the least friction work and the extension of clutch life.
The influence of inertia resistance on the drag torque in the wet multi-disk clutch with splined connected restriction
Authors: Shi Luqi , Ma Biao , Wu Jianpeng , Yan Xu , Li Heyan
Published: October 2019

A theoretical model of friction plate is established by using Resal theorem, and the inertia resistance of the friction plate is obtained from this theoretical model. Focusing on the bias phenomenon in friction pairs, a new model is investigated for analyzing the bias state under low speed difference considering about the gyro effect. As for the gap shrinkage under high speed difference, the negative pressure contraction model for the friction pairs is built by analyzing the oil film and the pressure between plates. Based on that, the influences of the inertia resistance of the friction plates for these two models are also discussed. Afterwards the gap dynamic change between friction pairs is investigated in the whole variation range of the relative speed. Finally, an improved model, considering the influence of the gap dynamic change between friction pairs, is proposed to simulate the drag torque. The results obtained from the simulation and test data indicate that, under the same lubrication condition, the drag torque in the wet multi-disk clutch increases at first and then decreases and finally increases with the rise of the rotational speed difference. Furthermore, the main factors influencing the drag torque are the bias of plates in the low speed difference (0∼1000r/min) and the gap shrinkage in the medium and high speed difference (>1000r/min) respectively. From the comparison between test data and the simulation results obtained from the improved model, the average relative error is only 6.34% at medium and high speed difference (>1000r/min), which can greatly improve the accuracy for the estimation of the drag torque in wet multi-disk clutch.
Virtual Modeling and Simulation of Transplanting Mechanism with Non-circular Planetary Gears
Authors: Yuan Yongchao , Deng Jiongfeng
Published: October 2019

This article deploys an exploratory development of super rice High-performance transplanter transplanting mechanism with non-circular Gears by dint of rice transplanter transplanting mechanism analog machine accroding to UG software.This research is first to building a model of non-circular Gears designed by researcher before,and then assemble the whole to obtain the result of virtual manufacturing with non-circular Gears, and assemble it on the test machine of rice transplanter test machine, also analysis the Kinematic Principle of Simulation result by UG software.Finally, make the motion trail conform to the agronomy requirement according to correcting and consummating the fember unqualified.
Application of Weighted Object Variance Algorithm in Metal Surface Defect Detection
Authors: Zhang Wanzhi , Du Jinsong , Li Xingqiang , Wang Wei
Published: October 2019

In the process of metal surface defect detection, it is difficult to detect and segment small defects. In order to solve this problem, this paper uses weighted object variance algorithm to detect metal surface defects. Then the feature of defect area is extracted and the defect classification model based on support vector machine is trained. In order to verify the effectiveness of the method, this paper takes the metal surface of bearing cylindrical roller as the specific research object. The experimental results show that the method meets the production requirements.
Study on spare parts requirement modelling of multi-component system under stochastic shock condition
Authors: Wang Qiang , Jia Xisheng , Cheng Zhonghua , Wang Qian , Wang Shuangchuan
Published: October 2019

In the field of modern industry, equipment is becoming larger and more complex. Some precision components, especially electronic components and mechanical components, will suffer from external vibration and shock and traumatic failures during operation. Therefore, the analysis of the failure process of multi-component system under the condition of common cause failure is of great significance to improve the guarantee efficiency of multi-component equipment system. When multi-component equipment system is running, the problem of traumatic failures of components under shock is not considered in the calculation of spare parts demand for the system. Based on the analysis of the correlation between equipment degradation failure and shock failure, a spare parts demand calculation model under random shock is established in this paper. Finally, the feasibility of the method is verified by an example. The simulation results show that the model can solve the problem of spare parts demand calculation of multi-component mechanical equipment under random shock.
Lightweight Design of Six-dof Tandem Manipulator Based on Additive Manufacturing Technology
Authors: Lv Xin , Yang Yongtai , Zeng Wenhao , Xu Dawei
Published: October 2019

At present, topological optimization represents the most advanced structural design technology, and additive manufacturing represents the most advanced manufacturing technology. Combining the two technologies to provide a very effective way for the lightweight of the manipulator arm. Taking the six-degree-of-freedom series manipulator as the object, the lightweight design was carried out from the aspects of material lightweight and structure lightweight. Firstly, under the limit conditions, the exploratory topology optimization of the manipulator arm of the aluminum alloy material and the manipulator arm of the 3D printed plastic material was carried out respectively, and the optimization results were compared. 3D printing plastic material was selected as the design material of the manipulator. Then, under the condition that the stiffness and strength requirements are met, the manipulator of 3D printing plastic material is designed with the method of size optimization and topology optimization for the two limit working conditions, and the geometric reconstruction and simulation verification are carried out at last. The results show that the final manipulator arm meets the requirements of stiffness and strength, reduces the weight by 26.5%, and finally achieves the goal of lightweight.
Research on the Performance of Honeycomb Support Structure Based on SLM
Authors: He Lijun , Zi Feiyue , Zhang Zhixiong , Tang Li , Li Po
Published: October 2019

Selective laser melting (SLM) can break through the constraints of traditional manufacturing methods and enable the fabrication of lightweight and complex parts. However, in the SLM manufacturing process, the overhang structure requires a support structure to be successfully manufactured. At present, the typical support structure is the lattice structure, which has poor manufacturability, and the manufacturing defects of some of the bars cause the structure to yield in advance, and the reliability is not high. In this paper, we design honeycomb structures with different parameters. A set of structural parameters with excellent performance were obtained. The compression test was carried out using the WDW-100 universal material testing machine, which shows that the honeycomb structure of this set of parameters has high strength and meets the requirements of manufacturing. Finally, taking the sensor mount as the object, this set of parameter honeycomb structure is used for light weight reconstruction, which can obtain better weight reduction effect under the premise of satisfying the strength of the parts, which provides technical support for the lightweight design of parts.
Research on Linear Vibration Feeder Driven by Langzhiwan Oscillator
Authors: Su Jiang , Tong Jie , Shen Yanhu
Published: October 2019

In order to overcome the shortcomings of electromagnetic interference and noise of electromagnetic vibration feeder, a linear feeder driven by Langzhiwan oscillator is designed, its working principle is analyzed, and the prototype of feeder is tested. The experimental results show that the resonant frequency of feeder is 17.5 kHz, the amplitude is 28μm when the driving source voltage is 200 V. The transmission speed of M2 nuts is 102 mm/s, and the feeder has the ability to transport materials in the frequency range of 17.1 kHz to 17.9 kHz. In addition, with the increase of voltage, the conveying speed increases linearly, and the conveying performance is greatly weakened due to the deviation of resonance frequency.
Multi-body dynamics analysis of a small piezoelectric turntable with high speed
Authors: Xue Shan , Meng Xianyu , Liu Zhengbin , Guo Jianbo , Tu Xin
Published: October 2019

Piezoelectric turntable is a new type of real-time image reconnaissance equipment. The fast movement of piezoelectric turntable is an important guarantee for fast target locking and tracking of imaging system. Therefore, the multi-body dynamic analysis of the piezoelectric turntable designed by virtual prototyping technology is needed to verify whether its function meets the requirements. SolidWorks software is used to build a three-dimensional model of a high-speed small piezoelectric turntable. Then, the three-dimensional model of piezoelectric turntable is simplified and introduced into Adams software for multi-body dynamics analysis. The analysis results show that the piezoelectric turntable can rotate around the azimuth axis and pitch axis at high speed, which meets the design requirements. The virtual prototyping technology improves the design efficiency and provides a theoretical basis for the design of similar turntables.
Stiffness weak link identification of cantilever beam based on vibration test data
Authors: Guo Tieneng , Cao Jinxuan , Cai Ligang , Wang Guang
Published: October 2019

The evaluation of the weak link of machine tool structural stiffness is the key link to improve the machining performance of the machine tool. It is proposed that the serial structure of the machine tool be equivalent to a cantilever beam structure and the static rigidity of the machine tool be studied by using the method of dynamic test. A theoretical method for evaluating the position of the weak link of cantilever beam stiffness and the magnitude of stiffness by using the curve angle index is proposed. This paper mainly studies the evaluation effect of indicators. Taking the MATLAB finite element numerical model of cantilever beam structure as a numerical example, the dynamic test data of each node of the numerical model are obtained by using the state space method. After Fourier transform, the angle index is studied by taking the amplitude of 0 Hz. The weakening of the elastic modulus of the element is used to simulate the weak link of stiffness, and the evaluation effect of the corner index is studied under the three conditions of weakening the stiffness of a single element, weakening the stiffness of two elements, weakening the stiffness of three elements and involving noise. The results of simulation and experiment show that the curve angle can be used to better evaluate the weak link of the cantilever beam, which has a certain practical value in engineering.
Analysis of amplitude-frequency characteristics of spiral vibrating feeder system
Authors: Su Jiang , Tong Jie , Shen Yanhu
Published: October 2019

Spiral Vibrating Feeder is a kind of common equipment in Machining Automation. Traditional theoretical analysis of spiral vibrating feeder is based on the dynamic model of vertical vibration, which can not really reflect the working condition of the system. On the basis of explaining the working principle of the spiral vibration feeder system, a three-degree-of-freedom vibration mechanics model of the system is established. The theoretical formulas of the amplitude-frequency characteristics of the system are deduced and analyzed, and Taking PEF120A feeding system as an example, the amplitude-frequency characteristics of the system are analyzed comprehensively. The experiments prove that the re-established system model is closer to the actual situation, which will lay a good theoretical foundation for the design of vibrating feeder for conveying precision components.
Analysis of Influence of Optical Glideslope Indicator Deviation on Carrier Aircraft Landing
Authors: Du Yajie , Zhao Jianjun , Yang Libin
Published: October 2019

The guidance provided by the optical glideslope for the carrier’s safe landing is very critical. Several optical glideslope stable modes are analyzed. And the line stability mode is chosen as the research object. In the line stability mode, the guiding principle of the optical glideslope is analyzed. Under this mode, the optical glideslope indication deviation can be represented by the offset of the “meat ball” seen by the pilot. Through simulation and calculation, the influence of different “meat ball” offsets on the landing point of the carrier aircraft can be obtained, which provides a reference for the safe landing of the carrier aircraft.
Research on Hydraulic Robot for Pipe Handling Based on Adaptive Fuzzy-PID Control
Authors: Guo Rong , Ma Wei , Zhong Haisheng , Liu Yuchao
Published: October 2019

In order to improve the control performance of the pipe handling robot and the tracking effect of manipulator trajectory, the adaptive fuzzy-PID algorithm was applied to the joint control of robot arm. According to the nonlinear and time-varying parameters of valve-controlled asymmetric hydraulic cylinders extending and retracting movement, considering the influence of hydraulic pipeline and oil compressibility, a mathematical model of valve-control asymmetric hydraulic cylinder system was established. The dynamic response of the system model was studied based on the co-simulation of AMESim and Simulink. The results showed that compared with regular PID, the adaptive fuzzy PID controller could effectively suppress the nonlinear effect caused by oil compressibility, and reduce the response time of the system. At the same time, it could enhance the anti-interference ability of the system, and improve the dynamic tracking performance of the pipe handling robot.
Application of Fuzzy Comprehensive Evaluation Method Based on AHP in Product Materials
Authors: Wang Weqing , Bi Yangang , Shen Xuehui
Published: October 2019

In order to research the material selection method of products more in line with consumer image, a fuzzy comprehensive evaluation method based on AHP is proposed to establish product material design system. Application software SPSS for factor analysis and cluster analysis, extract the perceptual image factor that affects the consumer to product material; Comparing the elements of product materials in pairs by using the tree hierarchical structure in the analytic hierarchy process, the fuzzy relation between consumer image and product material quality is presented in a quantitative form, establish a product material design system that meets the consumer’s perceptual intentions; Using fuzzy comprehensive evaluation method to quantify product material design system, Verify the accuracy of the research results. Taking the material selection of lipstick as an example to verify and analyze, it is proved that the fuzzy comprehensive evaluation method based on AHP is an effective method for product material research, it can provide theoretical guidance for designers’ material selection and decision making.
Effect of the build orientation on the mechanical behaviour of polymers by stereolithography
Authors: Liu Haorui , Yang Nana , Sun Yitong , Yang Laidong , Li Ni
Published: October 2019

The use of Rapid Prototyping techniques for the production of end-use parts is increasing in rapid manufacturing. The mechanical properties of stereolithography parts become the most important factor restricting its wide application. The mechanical properties of stereolithography parts can be not only influenced by the material characteristics, but also by the parameters of manufacturing. The purpose of this study is to investigate the influences of the build orientation on mechanical properties of stereolithography parts. Specimens were fabricated with different build orientations related to layout (flat or on an edge), axis and build angle. Mechanical testing including tensile, compressive and impact tests on stereolithography specimens were conducted. The results indicated that layout had a significant effect on tensile and impact properties, and the axis had no significant effect on tensile and impact properties. Also, build angles play an important factor in the compressive strength. From these results, it appears that related characteristics of layer interface have a significant influence on mechanical properties of stereolithography specimens.
Machine Learning Approach Based on Gene Expression Programming for Dynamic Production Scheduling Problem
Authors: Nie Li , Wang Xiaogang , Bai Yuewei , Wu Xiaoyan
Published: October 2019

Dynamic Job shop scheduling problem (DJSSP) which involves the dynamic characteristic of job arriving over time is one of the most popular scheduling problems in manufacturing system. In the paper, a machine learning approach is proposed for DJSSP. The proposed machine learning approach employs gene expression programming (GEP) which introduces automatically defined functions (ADF) into the representation of chromosome to construct efficient scheduling rules (SRs) automatically for DJSSP. The proposed GEP-based machine learning approach is evaluated and the results show that the approach is effective.
The error modeling and measurement of 3-axis machine tools
Authors: Pan Fangyu , Bai Yuewei , Xu Kefeng , Nie Li , Wang Xiaogang , Liu Kai , Wu Xiaoyan
Published: October 2019

Machine tools’ accuracy is key characteristic, which may affect processing quality. Error compensation is an efficient and economical way to upgrade machine tools’ precision. The paper focuses on the basic research of error compensation, which includes source of errors analysis, error modelling and errors acquirement. Thus, 21 geometric errors are sought out which have strong influence on the precision; relationship between errors and compensation is built; the measurements for all 21 errors (including the vertical roll error) are presented, by the experiments; the feasibility is validated.
Research on Dynamic Scheduling Arrangement of RGV in Intelligent Machining System
Authors: Zhang Qinhong
Published: October 2019

The intelligent machining system scheduling arrangement is through the RGV that can receive intelligent control of the system, so as to install raw materials and unload clinker for each CNC and coordinate the production of CNC in the whole system. This paper analyzes the order in which work orders are issued to RGV, comprehensively uses C++ and Matlab software to explore the scheduling scheme of intelligent machining system, combines time series and genetic algorithm to research and optimize the scheme, and continuously improves after mutation, and finally gives the optimal RGV scheduling strategy.
Investigation of residual stress relaxation on Cr12MoV steel under high-frequency cyclic loading
Authors: Wang Ping , Gu Bangping , Hu Xiong , Xu Guanhua , Lai Jintao
Published: October 2019

High frequency vibratory stress relief (VSR) is a procedure to reduce the residual stresses by means of high frequency cyclic dynamic stress. Cyclic loading, or cyclic dynamic stress, imposed on the workpieces during the high frequency VSR affects the reduction of the residual stresses. In this study, the high frequency VSR was carried out on the Cr12MoV steel quenched specimens. And the residual stresses on the Cr12MoV steel surface before and after the high frequency VSR were studied by the hole-drilling method. The results show that the residual stresses can be effectively reduced by the high frequency VSR. Moreover, increasing the high frequency vibration frequency and the high frequency vibration amplitude can improve the effect of the high frequency VSR.
Torsional Vibration and Bifurcation Characteristics of Automotive Main Reducer Based on Nonlinear Hybrid Model
Authors: Zou Lin , Jia Bing , Du Mingya , Lie Yujun , Xu Jinli
Published: October 2019

In the view of integrating dynamics of systems with dynamics of structures, the pinion shaft of automobile main reducer is divided into several torsion rod elements to establish its dynamic model, while the torsional vibration dynamic model of hypoid gears is still built with lumped mass method, thus the hybrid dynamic model of automotive main reducer is obtained by the combination of two kinds of dynamic models. Considering the nonlinear factors such as time-varying mesh stiffness, backlash and static transmission error of gear pairs, Runge-Kutta method is applied to obtain the time domain spectrum, spectrum graph, phase-plane diagram, Poincaré maps, and bifurcation diagrams of the system. The dynamic response characteristics of system with different parameters such as input rotational speed and mesh stiffness are systematically investigated by numerical simulations.
Multi-Sensor Network Cable Tunnel Monitoring System Based on GIS
Authors: Jing Zhongzhao , Li Chuyang , Ren Guangwei , Chi Yuanhong , Tian Fenglan
Published: October 2019

In this paper, the main factors affect the normal operation of power cables and cable tunnel are introduced. In view of these factors, a multi-sensor network cable tunnel monitoring system based on GIS. In the system, cable temperature monitoring system, tunnel environment monitoring system, tunnel security system and tunnel video monitoring system are embedded in the GIS platform, and the high voltage cable, cable tunnel environment and auxiliary facilities are monitored and controlled, which is of great significance to ensure the stable and safe operation of the cable.
A New Fatigue Analysis Method for Rotating Parts Based on Fatigue Cumulative Damage Criterion
Authors: Duan Chenghong , Han Xiangxiang , Luo Xiangpeng
Published: October 2019

The camshaft is one of the most important rotating parts in diesel engine. As a continuous rotating part, the high-cycle fatigue problem of camshafts has always been a hotspot in engineering. Generally speaking, nominal stress method is used to analyse high-cycle fatigue problems, but the continuous operation of camshafts determines that nominal stress method can not be used directly. Based on this, a load-discretization method based on the fatigue cumulative damage criterion and nominal stress method is proposed to solve the fatigue calculation problem of continuous rotating parts.
Research on the Relationship between Energy Consumption and Economic Growth in Jilin Province Based on Error Correction Model
Authors: Huang Yimiao , Qu Yongjun , Chen Yanyu
Published: October 2019

Under the call of the green economy, the analysis of the relationship between energy consumption and economic growth can cater to the current policy agenda to achieve a resource-saving and environment-friendly society. Based on this, the thesis applies the error correction theory model to apply the variable stability, causality and cointegration test to the relationship between energy consumption and economic growth in Jilin Province, and obtains energy consumption and economic growth in Jilin Province in the past ten years. The cointegration relationship and causality between the two countries show that urban economic growth can drive energy consumption, and the economic development of Jilin Province is not entirely dependent on energy consumption, but has a two-way causal relationship with the four variables. To this end, in the future industrial development and economic promotion, it is necessary to accelerate the development and promotion of low-energy, high-efficiency industries, promote the diversified development of the energy structure, actively play the role of government agencies in policy regulation, and increase investment in technological innovation. And adopting taxes or funds to promote industrial capital to reform in a technology-intensive manner.
Research on rolling fatigue testing for manhole covers
Authors: Su Zhonghua , Yu Xiang , Yang Zhangcheng , Nie Hongbin , Ou Jian
Published: October 2019

Some manhole cover accidents have been listed. The direct cause and root cause of manhole cover accident have been analyzed. Anti-rolling fatigue testing for manhole covers has been put forward and studied. Test parameters and decision methods have been determined.An equipment for manhole covers anti-rolling fatigue testing, which including equipment structure, equipment parameters, manhole cover installation structure and equipment operation, has been studied and designed.
Microstructure of resistance spot weld ultra high strength steel Q&P980
Authors: Liu Tao , Wang Hua , Yang Haifeng , Ke Chongjian , Zhou Li , Zhao Hongyun
Published: October 2019

1mm thick Q&P980 steel plate was resistance spot welded and the appearance and microstructure of welded joint were investigated. The results show that Q&P980 steel achieves a better connection, When welding current is 12.5 kA, welding time is 10cycle, and electrode pressure is 2.4 kN. The joint can be divided into Fusion Zone (FZ), Coarse Grained (CG) HAZ, Fine Grained (FG) HAZ, and Inter Critical (IC) HAZ, Base Material (BM). The FZ undergoes recrystallization, and the HAZ undergoes a phase change due to thermal cycling and plastic deformation. FZ, CGHAZ and FGHAZ are completely austenitized and lath martensite is formed. ICHAZ generates tempered martensite.
Contact fatigue analysis of gear transmission system of drive axle final drive of truck
Authors: Wang Zhiqi , Liu Wenzhi , Liu Qingchao , Tao Jian , Wang Tianxiang , Chen Ye
Published: October 2019

The function of the final drive of a truck axle is to reduce the speed and increase the torque. The main transmission system is composed of a spiral bevel gear mechanism and a helical gear mechanism. After fully considering powertrain mass, moment of inertia and dedendum transition fillet, the dynamic calculation model of the meshing collision of the gear teeth was established. The speed of the gear and the contact force of the tooth surface in a moving cycle are calculated and analysed. Based on the results of the dynamic calculation as the load data, the finite element computation model of frictional contact between spiral bevel gear mechanism and helical gear mechanism is established. Using the augmented Lagrange multiplier method, the contact stress distribution of the tooth surface under the transient impact load is calculated and analysis in a motion cycle when the teeth are engagement-in and engagement-out. In order to avoid the damage of gear tooth contact fatigue, the more realistic surface contact fatigue strength of the gears was obtained and compared with the theoretical calculation according to the finite element calculation results.
Point Cloud Registration Method for Pipeline Workpieces Based on PCA and Improved ICP Algorithms
Authors: Xue Shan , Zhang Zhen , Lv Qiongying , Meng Xianyu , Tu Xin
Published: October 2019

Aiming at the registration problem of point cloud data obtained by laser scanning workpiece, a new automatic registration algorithm of point cloud based on PCA algorithm and improved ICP algorithm is proposed. Firstly, the feature points are selected according to the change rule of normal vectors in the original point cloud data, and the initial matching point set is obtained by establishing the histogram of feature points (FPFH); then the principal component analysis (PCA) is used to match the initial data; Finally using the k-d tree to accelerate the improved iterative method is closest point (ICP) precise matching, and using quaternion method of registration parameters are obtained. Experiments are carried out on the proposed new algorithm and PCA+ICP algorithm, and the experimental results are compared. The results show that the new algorithm can achieve registration, and improve the speed and accuracy of registration, which provide a reference for similar problems.
Point Cloud Registration Method for Pipeline Workpieces Based on RANSAC and Improved ICP Algorithms
Authors: Xue Shan , Zhang Zhen , Meng Xianyu , Lv Qiongying , Tu Xin
Published: October 2019

Aiming at the registration problem of laser-scanned workpiece point cloud data, a point cloud registration method based on RANSAC algorithm and improved ICP algorithm is proposed. Firstly, feature points are selected according to the variation law of the normal vector in the original point cloud data, and the initial matching point set is obtained by establishing the histogram (FPFH) of feature points. Then a random sampling consensus (RANSAC) algorithm is applied to the initial data matching. At last, the nearest point iterative algorithm (ICP) accelerated by k-d tree is used for accurate matching, and the quaternion method is used to obtain the registration parameters. The new algorithm and PCA+ICP algorithm are tested and the experimental results are compared. The results show that the new algorithm can achieve registration, and improve the speed and accuracy of registration, which provide a reference for similar problems.
Welding Groove Detection Based on Hough Transform and Gray-Level Co-Occurrence Matrix
Authors: Li Changwu , Xia Huiwen
Published: October 2019

With the development of the intelligent robot industry and the increasing labor costs of production, the demand for the quality identification of welding products using robots is increasing. Position identification and shape judgment of the welding groove are important conditions for measuring welding precision and welding quality. Based on a variety of welding groove images, the mathematical model of groove size and texture is constructed. Hough transform and gray-level co-occurrence matrix are used to identify and extract the welding groove position and shape characteristics in order to judge the quality of welding products. According to the identification and extraction of welding groove position and topography, through the simulation of the welding groove location and terrain identification and extraction of the model were analyzed from various angles and the accuracy of the algorithm.
Binary Fuzz Testing Method Based on LSTM
Authors: Yuan Xiaoxiao , Pan Limin , Luo Senlin
Published: October 2019

Fuzzing is an effective software testing technique to find bugs. In the binary fuzzing, the attempt of generating test data mainly focuses on the improvement of the mutation algorithm, which lacks further screening of the test data. This paper proposes a binary fuzz testing method based on long short-term memory. This method record the executed path information by QEMU. Then we assign values to different code branches according to the frequency of executed path. The path weights can be calculated. The LSTM model will be trained by test data and the path weights. Finally, we can take the test data as input and filter the data by referring to the path weights. This method can improve the time efficiency of fuzz testing. Experiments on a variety of different types of binary programs show that compared to the state-of-the-art fuzzer American fuzzy lop, this method achieves higher code coverage and time efficiency in the same time.
Research on Link Prediction Based on Similarity Index Algorithm
Authors: Xu Zhaodi
Published: October 2019

For social network with no rights and no directions, link prediction has lower computational complexity and higher link prediction accuracy by using similarity metrics. The existing local information-based similarity metrics are mostly calculated by the common neighbors of the pair of nodes to be predicted when performing link prediction, but these methods do not consider the influence of the relationship between the common neighbors. Aiming at this problem, this paper proposes a new link prediction algorithm based on the existing local information-based similarity measurement method, which not only considers the number and degree of common neighbors between the pairs of nodes to be predicted, but also considers the relationship between common neighbors. In order to verify the effectiveness of the algorithm, the proposed algorithm is compared with the original algorithm and other methods based on the similarity measure of local information in this paper. The experimental results demonstrate the effectiveness of the algorithm.
Power-split transmission performance research with the method of lever analogy
Authors: Zou Naiwei , Han Ping , Wu Wangjiang , Lu Jinlong , Wang Songlin
Published: October 2019

Power-split transmission system was very complex in structure; the continuously variable transmitting performance of this system is difficult to analysis, which impeded the further research of this kind of transmission. In this research, universal series mathematical models of power-split transmission system were set up firstly. Then, the lever analogy analysis method was introduced into the power-split transmission performance analysis process, and the multi-range continuously variable transmitting performance of power-split transmission was described comprehensive. Finally, the method was used to analysis one real power-split transmission systems, ZF Friedrichshafen power, and the accuracy, validity and convenience of this method were verified. The result show that the method of mathematical model combine with lever analogy could analysis the power-split transmission system continuously variable transmitting performance more correctly, easily and rapidly, it could provide a more intuitive and efficiently analysis method for the further research of power-split transmission system.
Optimization of metal belt continuously variable transmission pulley based on multi-island genetic algorithm
Authors: Cheng Jianfei , Li Hangyang , Fu Bing , Zhang Feitie , Zhou Yunshan
Published: October 2019

The efficiency of metal belt CVT is an important index to evaluate its transmission performance, and the greater the axial deformation of the pulley, the greater the efficiency loss. In this paper, the deformation of pulley under different passive pressures is measured by experiment, and the reliability of the optimized 3D CAD model is verified by comparing with the data of the simulation model. And based on multi Island genetic algorithm (MIGA), using ISIGHT to integrate CATIA and ABAQUS, and the maximum stress is used as the constraint condition, penalty function integrate pulley deformation, mass and moment of inertia of the smallest to construct single objective function to optimize a CAD model, finally the test sample analysis verify the reliability of the optimization results. Research results show that, the optimized pulley mass was reduced by 16.96% and the inertia was reduced by 11.7%. Comparing the axial deformation of different speed ratios of the pulley, the deformation is smaller than that before the optimization, laid the foundation for the study of pulley transmission efficiency.
Labyrinth structure sealing performance on grounding device of railway passenger vehicles
Authors: Li Gang , Lin Xiangli , Liu Yingying , Li Lun , Liu Qingshan , Guo Jishun , Zhao Zilian
Published: October 2019

In this paper, the function of isolating carbon powder and water in the labyrinth structure on Grounding Device of Railway Passenger Vehicles is studied. The possibility of carbon powder and water entering the bearing through the labyrinth structure under the condition of seal failure of the grounding device is analyzed.
Design and application of carbon fiber composite material in end box of rail transit vehicles
Authors: Liu Yingying , Lin Xiangli , Li Zuoxin , Dai Pingren , Zan Haibin , Cai Daotao , Du Chenglong
Published: October 2019

Carbon fiber composites have great application prospects in the field of rail transit. In order to study the application of carbon fiber composite materials in rail car end boxes. Firstly, the carbon fiber paving structure was designed, and then the product performance of carbon fiber car end box was studied by finite element analysis calculation and sample test verification method. The research results show that the weight of the car end box of carbon fiber composite is about 45% of the weight of carbon steel and stainless steel box, about 72% of the weight of aluminum alloy box, and the weight reduction effect is remarkable. The static strength and fatigue life of the box are the test results of insulation withstand voltage and protection grade all meet the standard requirements and have passed the test verification. The carbon fiber composite car end box can be used and promoted on rail transit.
Construction of the Remote Welding System based on Power Line Communication
Authors: Yin Ziqiang , Zhang Hongtao , Liu Wei , Wang Hougao , Yin Cong
Published: October 2019

Remote welding technology plays an important role in the construction of national key projects. Instead of manual welding and full-autonomous welding, it is the best way to apply remote welding technology to practical engineering by employing a special robot. This study uses the remote welding power supply cables as the carrier to construct the power line communication network. The key technical problems of the power line communication for complicated electromagnetic environment are proposed in this paper. On this basis, the welding parameters and the environment parameters are transferred to the local control unit, by the power line communication network. The influence rule on weld formation, microstructure, mechanical properties, and welding defects can be revealed by analyzing the above factors. This study explores a feasible way for the robot remote welding by the way of integration innovation. It will lay a foundation for the application of the robot remote welding technology in the construction of national key engineering.
The Research on Minimum System Construction Management Based on Water Temperature Detector
Authors: Huang Yuan , Li Mingze , Wu Fujun
Published: October 2019

The operation of the system greatly affects our work efficiency. We need to improve our system construction management. Therefore, we will use the eight-way detection method to study how to manage the minimum system with the water temperature detector. The research results show that the design and construction of the minimum system has passed the temperature detection of DS18B20 in eight, the system is stable, and the effect of the minimum system of process management is achieved.
Mutual Inductance Measurement and Analysis of Near-Field Magnetic Coupling
Authors: Lee Chin-Hsiung , Hu Qinjun
Published: October 2019

Magnetic element is an important component of power converter. It includes inductors, common mode inductors and transformers. Configuration and wiring of their components will affect the ability to suppress electromagnetic interference noise. Due to the miniaturization and increasingly higher power density, the composition of the power converters become more and more compact, which leads to the near field coupling effects among the components. In this study, the mechanism of near-field magnetic coupling between magnetic elements is analyzed, and the accuracy of the parameters of near-field magnetic coupling is further verified the simulation through experiments.