bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Influnence Law of Existing pipe-jacking Tunnel affected by Adjacent Foundation Pit Excavation in Soft Clay Stratum
Authors: Li Wenjiang , Han Xianmin , Chen Tao , Guo Xiaolong , Wang Kang
Published: December 2019

The problem that existing pipe-jacking tunnel was disturbed by adjacent foundation pit excavation had arose relative researcher’s attention, especially in soft clay stratum. Firstly, by means of numerical simulation, the deformation of diaphragm wall and settlement law of soil outside the pit during foundation pit construction were analyzed. Then deformation and stress characteristics of existing pipe-jacking tunnels were studied influenced by different spacing between foundation pit and pipe-jacking, different excavation depth of foundation pit and different buried depth of pipe-jacking. The main conclusions were as follows. (1) The maximum horizontal displacement of the diaphragm wall was located at 3/4 of the excavation depth of pit. (2) Due to the blocking or isolation effect of existing rigid pipe-jacking on the deformation of surrounding soil, the surface settlement became smaller.(3) Deformation, structural stress of pipe-jacking would gradually decreased under the conditions of increase of the spacing between foundation pit and pipe-jacking, decrease of excavation depth of pit and buried depth of pipe-jacking, (4) Due to the influence of pit excavation, deformation and stress of pipe-jacking near the end wall and middle of the foundation pit were relatively large. (5) When the buried depth of pipe-jacking was located at near 3/4 of excavation depth of pit and the spacing was less than 10m, excavation of the pit has a great impact on the existing pipe-jacking tunnel.
Research on Parking Lot Selection Model Taking Secondary Parking into Account
Authors: Yu Chengqiang
Published: December 2019

Parking difficulty is a common problem in a lot of cities. People often find that there is no space in the selected parking lot so they have to look for another parking lot, which makes the parking efficiency very low. In this paper, by introducing the concept of time value, a calculation method of secondary parking cost is proposed, considering the factors affecting parking saturation, and combining BP neural network to predict parking space. Then, an optimal parking selection model with minimum generalized parking cost is built, which is applied to the calculation of optimal parking choice in Fuzhou central business district. The parking lot selection model which is built in this paper will improve the parking success probability of the selected parking lot, reduce the blindness of parking lot selection, the secondary parking flow rate and the heavy traffic in the city.
Design and Simulation of Urban Variable-route Bus
Authors: Liu Lihua , Li Junzhuo , Li Aizeng , Zhao Jianfeng , Chen Jianping , Luo Shushuo
Published: December 2019

As a new mode of public transport service, variable-route bus service can further improve the service quality of urban public transit system, and will become an important part of integrated urban comprehensive public transit system. Therefore, this paper studies the operation scheduling model of variable-route bus, aiming at improving the service level of public transport and reducing the operating cost. Based on the theoretical research, the service area maximum width of variable-route bus is obtained according to the relationship between the system slack time and the travel time. Then a two-stage vehicle scheduling model which comprehensively considers the reservation demand and the dynamic real-time demand is proposed. The operation mode conversion model of variable-route bus and the conventional bus are further established, which provides powerful guarantee for the application of variable-route bus service. Finally, by designing simulation experiment, the comparison of relevant operation service parameters between variable-route bus and conventional bus is conducted. This paper aims to study the influence of variable-route bus to operation and scheduling, and provides a theoretical basis for the promotion and application of variable-route bus in China.
Analysis of the problems in China’s railway freight pricing system
Authors: Li Lutian , Guo Jingwei
Published: December 2019

The fundamental changes in China’s market structure have ushered in the development opportunity for the cargo transport market and prompted fierce market competition. In this economic environment, the perfection of railway freight pricing system directly affects the market competitiveness. Through sorting out the change course of China’s railway freight pricing management mechanism, this paper analyzes the current situation of freight pricing management mechanism, expounds the freight pricing system. On this basis, the problems of the pricing system are explored, which provides theoretical basis and technical support for improving the railway freight pricing system and deepening the reform of the freight rate mechanism.
Analysis and Evaluation of High Quality Development Status of Beijing Transportation
Authors: Wang Ying
Published: December 2019

China is realizing the leap of a big transportation country to a powerful transportation country, and promoting high-quality development is a fundamental requirement for transportation work in the future. This paper elaborates on the high-quality connotation of transportation, and measures the high-quality development index of transportation in Beijing from 2014 to 2018 by constructing a high-quality development evaluation index system. The results show that the high-quality development level of Beijing’s transportation has been increasing year by year, but the overall condition is not so good. At the same time of focusing on quantity, it has begun to work towards quality. In the future, Beijing’s transportation development should continue to be tilted towards high efficiency and green.
Research on Promoting Strategies of Urban Comprehensive Transportation Planning under the Background of Multiple Plans Integration
Authors: Zhong Guo , Yin Yixiao , Wei Linghong
Published: December 2019

In order to solve the problems of self-contained system, content conflict and lack of cohesion in various kinds of spatial planning, China has carried out Multiple Plans Integration works. As one of the important contents of spatial planning, how to seize the opportunity to play a greater role in the Multiple Plans Integration system is also necessary to study the key points and methods of transportation planning under the new situation. On the basis of understanding the connotation of Multiple Plans Integration, this paper puts forward the key problems to be solved in comprehensive transportation planning. On this basis, it puts forward some policy suggestions on top-level design, transportation model, performance evaluation and implementation mechanism of comprehensive transportation planning under the situation of Multiple Plans Integration, which can provide reference for the development of China’s transportation planning in the direction of Multiple Plans Integration.
Workbench Control System Design Based on Mecanum Wheel
Authors: Bai Ruoqi
Published: December 2019

The Mecanum wheel gains the particular interests in the field of robot, vehicle and workbench due to the capabilities of moving toward, sideway, rotation and combination of other motion pattern. This report details the progress of designing and building an omni-wheel robot control system which is controlled by Programmable Logic Controller (PLC) to achieve the ability of instantaneous motion in any direction with 4 coupled Mecanum wheels involved. A simulative control program has been developed to fulfill the function of line motion. Additionally, several advanced control methods have been reviewed, such as FPGA, NLP and TLC, which can be helpful in the future modification and improvement.
Study on Simulation Analysis of Vehicle Handling Stability Based on MATLAB
Authors: Cao Fengping , Wang Jinduo
Published: December 2019

Vehicle handling stability is an important performance index of vehicle, which directly affects the safety performance of vehicle. Driving speed, tire lateral stiffness, center of mass position, front wheel Angle are important factors affecting vehicle handling stability. This paper analyzes the influence of these four factors on the vehicle handling stability, draws the corresponding curve with Matlab software, and simulates the vehicle handling stability. This study provides a research method for analyzing the influence of driving speed, tire lateral stiffness, center of mass position and front wheel Angle on vehicle maneuvering stability.
Research and Optimization of Vehicle Handling Stability Based on Multi - body Dynamics
Authors: Chen Yajuan , You Fei , Li Xianglin , Fu Lei
Published: December 2019

Based on multi-body dynamics virtual simulation method, the vehicle simulation model is built and the transient response characteristics of the vehicle are analysed under the steering angle step input. According to the results, the improving method is given. The optimization and stiffness test of tuning bushing are carried out, and the better bushing stiffness is obtained. The vehicle steering transient response performance improvement effect is obvious. This method provides theoretical reference for structural engineers.
Research on Community Distribution Model Based on Structural Equation Model
Authors: Cong Danyang
Published: December 2019

Due to the increasing demand, community logistics has drawn the attention of the industry. Studying the community distribution model can not only reduce logistics costs, but also reduce resource consumption. Based on the structural equation model, this paper effectively combines the planned behavior theory model with the normative activation theory model, and joins the enterprise cost factor to construct a community distribution model, and effectively improves the customer satisfaction.
Analysis of Urban Traffic Engineering Planning Based on Travel Well-being
Authors: Jia Siqi
Published: December 2019

Traffic engineering system is one of the most important infrastructure in urban. The built environment and operation impact everyday life in urban. In order to build modern integrated transportation system of “One Belt and One Road”, travel well-being should be taken into consideration. Ordered logit models were built in this paper to find the pain points of traffic engineering design. Some recommendations were offered to improve the whole quality and efficiency of transportation system.
The design of AGV’s dynamic wireless power transmission power supply based on Adaptive Weight Value Multi-objective Genetic Algorithm
Authors: Ning Pingfan , Li Tiantong , Niu Pingjuan
Published: December 2019

AGV is the application of modern factory intelligence and automation. With the development of wireless power transmission (WPT), its transmission efficiency and stability are getting higher and higher. However, from static charging to dynamic power supply, the cost of technology implementation has increased significantly. This paper proposed a method to supply power to logistics AGV by intermittent segment, established the binary coverage model according to the power coverage distance, and designed an Adaptive Weight Value Multi-objective Genetic Algorithm (AWVMOGA) for this model to Optimizing the path design of sectional power supply. The influence of three weight value adaptive methods on the optimization results is analyzed, the effectiveness of the proposed method is analyzed and verified through case simulation.
Experimental Study on Shear Behavior of Expansive Soil Modified by Gravel Sand
Authors: Yang Lu , Deng Xiufu
Published: December 2019

Using the strain-controlled direct shear equipment, some direct shear experiments were carried out on the soil samples of Nanyang expansive soil with different gravel ratios under the specific water content, and the shear strength, cohesion and internal friction angle of the expansive soil samples were studied. The experimental results show that the shear strength of the expansive soil samples increases with the increase of vertical pressure. As the proportion of gravel sand increases, the shear strength of expansive soil samples increases to varying degrees. The shear strength of expansive soil increases significantly when the proportion of gravel sand is in the range of 10%~40%, and the shear strength of remolded soil is the highest when the gravel sand content is 10% under the lower vertical pressure. Under the higher vertical pressure, the shear strength of the remolded soil is the largest when the gravel content is 20%, and the shear strength of expansive soil is close to that of pure expansive soil when the proportion of gravel sand is 50%. The cohesive force of the sample increases first and then decreases sharply with the increase of the proportion of gravel sand, and is maximum when the content of gravel sand is 10%. The internal friction angle increases first and then decreases slowly with the increase of the proportion of gravel sand, and is maximum when the gravel sand content is 40%. The results show that gravel sand can effectively enhance the shear strength index of expansive soil, which can be used as a good engineering application material for improving expansive soil.
A novel deep recurrent neural network for Short-term travel demand forecasting under on-demand ride services
Authors: Wei Wang , Yan Xuedong
Published: December 2019

Short-term travel demand forecasting throughout a city is crucial for passengers, drivers and the on-demand ride service platform, which could reduce waiting time and fuel consumption. In this paper, we propose a novel stacked bidirectional long short-term memory neural network (SBi-LSTMs) that can forecast short-term travel demand in each area of a city based on historical demand data and other relevant information. The proposed model is evaluated on the real-world data provided by China’s largest on-demand ride platform (DiDi Chuxing). The experimental results show that the SBi-LSTM outperforms other benchmark algorithms in predicting large-scale travel demand, such as ANN, RNN and LSTM. In addition, we analyzed the effects of different parameters on performance and training time.
Design of High Efficiency Single-Phase Bridge Passive Inverter Based on SG3525
Authors: Zhu Zhen , Wang Renda , Yin Yong , Xing Shengwei
Published: December 2019

In this work, a method for simultaneously improving the conversion efficiency and power quality of marine distributed generation was proposed. Aiming at the insufficient correction of output waveform based on inverter technology, a model of improved inverter conversion system was built. For the limitation of external power grid pollution treatment, the self-regulation ability of the output voltage waveform was improved by adding high-performance real-time feedback technology and PI regulation. The test results showed that the proposed method had the advantages of stable output, high precision, good power quality, and superior to the traditional method of indiscriminate feedback regulation in terms of power conversion efficiency.
Study on Effects of FDM 3D Printing Parameters on Mechanical Properties of Polylactic Acid
Authors: Yu Zhu , Gao Yingchao , Jiang Jie , Gu Hai , Lv Shuaishuai , Ni Hongjun , Wang Xingxing , Jia Chaofan
Published: December 2019

In view of the existing problems of complexity of process parameters and the difficulty in determining the optimal process in the field of 3D printing, polylactic acid (PLA) samples were prepared by fused deposition modeling (FDM). Orthogonal experiments were designed with 3D printing parameters (layer height, filling density and printing speed) as factors. The effects of layer height, filling density and printing speed on the tensile and compressive properties of PLA were studied. When layer height is 0.15 mm, the filling density is 100%, and the printing speed is 30 mm/s, the sample has the best comprehensive mechanical properties.
Analysis of creeping mechanism and eliminating measures of creeping phenomenon of machine feeding system
Authors: Yu Chuanliang , Liang Ruijun , Li Wei , Song Dan
Published: December 2019

When the machine tool feeding system is running at low speed, the creeping phenomenon of the system will occur, which seriously affects the machining accuracy of the machine tool and the surface quality of the parts. In this paper, the mechanism behind the creeping phenomenon generated by the machine tool is theoretically analyzed. The dynamics and mathematical model are established, and the critical equation for generating the creeping phenomenon is solved based on the dynamics and mathematical model which we established. The influence of various factors on the creeping phenomenon is obtained by the equation analysis. Some measures to eliminate creeping phenomenon are presented.
Research on Polar-region Coarse Alignment Algorithm Based on Grid System
Authors: Tian Ming
Published: December 2019

Due to the convergence of meridians in polar regions, the geography-based northern-azimuth mechanics arrangement has problems such as increase of error and computational overflow in polar navigation, and the traditional compass alignment scheme is unable to operate normally. In this paper, the problem in polar navigation is solved by using the mechanics arrangement scheme, and a simulated analysis has been carried out on the application of compass alignment in high latitudes through static data, which verifies that it is unable to operate normally at the pole. Then compass alignment has been replaced by anti-sloshing coarse alignment and a simulated verification has been conducted on its correctness. After that, the latitude increment method is used to convert the sports car data at low-latitude regions to high-latitude regions and carry out a semi-physical simulation, which further verifies the correctness of the grid inertial navigation and the coarse alignment method in anti-sloshing polar region.
The Application of the Solid Waste Compost Products in Garden Plant Planting
Authors: Cai Xiaolong , Tan Jianyang , Chen Huaji , Huang Mingji , Huang Xinying
Published: December 2019

To solve the problem of solid waste pollution generated during the Ecological Rural Construction in China, the products obtained from composting were used for garden utilization on the premise of mixed compost product treatment of rotten garbage in rural areas. The results showed that the solid waste compost products had good biosafety and fertilizer efficiency in the growth of landscaping plants such as woody flowers, herbaceous flowers, turf plants and foliage plants. The experimental plants could not only survive in the soil containing compost products, but also grow well, significantly better than growing in the garden soil.
Optimization Design of Support Arm of an Upper Limb Rehabilitation Robot
Authors: Liu Hairui , Wang Yu
Published: December 2019

According to the structural design requirements of upper limb rehabilitation robot, the static analysis and harmonic response analysis are made in this paper. The structure of the upper limb rehabilitation robot is simplified in different ways according to the importance of each part of the structure. Selecting different element types and establishing finite element model Based on its analysis results, some unnecessary parts are removed and simplified, and the main forced parts are optimized by defining parameters to optimize and re-design the structure. The static analysis and harmonious response analysis of the modified model, comparing the structure before and after optimization, show that the modified structural mechanical properties are obviously improved and the design requirements are fully met.
Failure Mechanism and Prevention Research of Adhesive Wear in the Guide Part of Globe Valve
Authors: Chen Shaojiang , Zhang Qing , Sun Yilong , Gu Yufei
Published: December 2019

For the failure of a low-temperature globe valve, through disassembly and material analysis, the cause of the failure was initially determined to be caused by adhesive wear between the disc guide rod and the valve seat. From the three aspects of material detection, stress and adhesive wear, the failure mechanism of stainless steel motion pair was analyzed. Finally, the wear test was carried out for chrome plating and non-chromium plating. Tests showed that when the valve seat is chrome-plated, the surface hardness of the guide portion is increased, which could effectively prevent the adhesive wear failure of the guide rod and the valve seat guide hole.
Design of Armature Interference Structure of New Quadrupole Track Electromagnetic Launcher
Authors: Chen Qingrong , Shu Tao , Feng Gang , Liu Shaowei , Cui Mengyang
Published: December 2019

How to provide pre-tightening force for armature and how to achieve interference fit between armature and track are the basic and key difficult problems in the research process of electromagnetic track launcher, which directly affect the contact characteristics between armature and track, and have important research significance. Firstly, according to the armature arm structure of C-type armature of railgun, the interference structure of armature of new quadrupole track electromagnetic launcher is designed. Then, in the simulation process, two kinds of interference structures are simulated and analyzed by the loading assembly method. Finally, the final structure of armature interference is determined based on the four performance indicators of stress, pressure contact efficiency, stress and pressure distribution uniformity to quantify the contact characteristics. The results show that scheme 2 is more suitable for armature of new quadrupole track electromagnetic launcher, and has the best performance index when the interference is 0.6 mm.
Numerical Analysis of Nylon Projectile Engraving into Rifle
Authors: Dong Yucai , Sun Jing , Gong Liming , Wang Jianjun
Published: December 2019

The parametric model of projectile and rifled barrel is established by using finite element software ABAQUS. The numerical simulation of the projectile engraving into the bearing band under the maximum chamber pressure of 10 MPa and 15 MPa is carried out respectively. he force condition and morphological changes of projectile during extrusion at different times are analyzed and explained. The variation of velocity and displacement of projectile is obtained in the chamber, respectively. Simultaneously, the velocity and displacement components of rifled barrel and slippery barrel after muzzle exit are presented. It is verified that the rifling structure can effectively reduce the emission dispersion of the launching system under gravity free.
Three common preparation methods of hydroxyapatite
Authors: Ma Guoqing
Published: December 2019

Hydroxyapatite has good stability, biological activity and biocompatibility, the calcium ions can be a variety of metal ions by ion exchange reaction, form M apatite of the corresponding metal ions (M on behalf of metal ions that replace calcium). Hydroxyapatite also has a good ability of bone conduction, bio decomposition and bone formation induction, make it an excellent and nearly ideal repair and replacement material for human teeth and bones when damaged. However, due to its low strength, poor toughness, difficult to form, poor corrosion resistance, hydroxyapatite has not been widely used. Therefore, the preparation of hydroxyapatite with superior comprehensive properties and more ideal composite materials has become the focus of research in recent years. This article is written based on the research status of hydroxyapatite, summarizing the origin, development, preparation, application and development prospect of hydroxyapatite. Emphatically analyzing the advantages and disadvantages of three common methods, including hydrothermal method, solvothermal method and homogeneous precipitation method, the structure, size, properties and application of hydroxyapatite obtained using these methods are also discussed. Views on the future development prospect and research direction of hydroxyapatite are also put forward.
The Application of Artificial Intelligence in Mechanical Manufacture Industry
Authors: Wang Yubo
Published: December 2019

Artificial intelligence (AI) technology, as one of the most advanced science and technology in the current society, has been applied more and more widely to production and life, and especially in manufacture industry. This paper studies the application of artificial intelligence in mechanical manufacture industry. Firstly, it briefly introduces the definition and development of artificial intelligence and that of mechanical manufacture industry. Secondly, it analyzes the advantages of AI. Lastly, it illustrates how artificial intelligence technology is applied in mechanical manufacture mainly from the aspects of fault diagnosis, quality inspection, improving the safety of working places and other aspects as well.
Research on Wireless Pulse Monitoring System Based on AVR
Authors: Li Chao
Published: December 2019

Pulse is the most important, sensitive and reliable source of information for human activities. It is an important window to reflect the health of the human body. The extraction speed of the pulse is fast. Therefore, it is also an effective method to quickly find the cause by using the pulse signal. This topic adopts embedded and wireless communication technology, and proposes a new scheme for processing pulse signals, namely acquisition and processing and wireless transmission part (front end system) + wireless reception and PC display part (back-end system). The front-end system is mainly responsible for the acquisition and initial processing of the pulse signal and can be sent separately. It can be connected to the PC through the wireless receiving and serial port interface. The back-end system is mainly responsible for tracking and displaying the signal transmitted by the front-end system. It is the role of the wireless receiver module that enables the system to have remote monitoring capabilities.
Toughness Detection and Gradation for Kitchen knife Edge
Authors: Su Zhonghua , Yang Zhangcheng , Huang Taizhong , Mi Haipeng , Chen Na
Published: December 2019

Breakage, curling edge and bluntness are the common failure forms of kitchen knife edge. A comprehensive characterization index, knife edge toughness, has been proposed, which including sharpness, durability and roll/breakage edge resistance indexes. The definition, testing method and testing equipment for each index have been described. Gradation for each index has been taken by market sampling and testing. The grade marking method for kitchen knife edge toughness has been demonstrated by image case.
Research on Machining Error of Globoidal Cam Profile Based on Adaptive Algorithm
Authors: Wu Panlong , Hu Dongfang
Published: December 2019

In order to effectively control the machining error of globoidal cam profile, an adaptive tool position error compensation algorithm is proposed. According to the space meshing principle and the rotation transformation tensor method, the actual working profile equation of the non-equalization diameter machining globoidal cam is established. The objective is to minimize the maximum deviation of the actual tool axis, and search the optimal tool offset and direction during machining to achieve adaptive compensation of the tool position. When the tool radius compensation amount Δr=3mm, the theoretical value of the maximum normal error of the cam profile is close to the simulation value. The result validates the effectiveness of the tool position control technique of the adaptive algorithm for machining error compensation, thereby the machining accuracy of the globoidal cam is improved greatly.
Establishment and research of state model of intelligent vehiclebend system based on kalman filter
Authors: Fan Gong , Chen Chaoda
Published: December 2019

In view of the problems of route selection and driving stability of intelligent vehicle in the process of turning, a state model of intelligent vehicle turning system control based on Kalman filter is proposed. Taking intelligent vehicle as the research object, according to the route of intelligent vehicle passing through a certain bend at uniform speed, the corresponding state transition model of intelligent vehicle’s speed and position is established, and the state model of intelligent vehicle’s bend system is analyzed, and the system state equation of intelligent vehicle in the process of bend movement based on Kalman filter is obtained. According to the state equation of the system, it can effectively monitor the speed, position and trajectory of the intelligent vehicle on the bend. Combining with Kalman filter algorithm, it can effectively reduce the noise of the control process and observation noise. It can be used to achieve more stable and accurate control of the intelligent vehicle in the bend movement.
Research on Well Trajectory Deduction Method Based on Pythagorean-Hodograph Quintic Space Curves
Authors: Li Yufei , Cao Yinping , Liu Yuxue , Li Mingfei , Yihua Dou , Zhang Jiantao , Zhang Lin
Published: December 2019

Considering the influence of key parameters such as bore angle, azimuth and sounding of wellbore, based on the spatial five-time PH curve with continuous unit tangent and directional curvature, no need for iteration, using Bessel polynomial interpolation method, optimization the spatial model and the curve description can accurately deduct the spatial parameters of the fifth point according to the determined four points of the space, and then establish the wellbore trajectory analytical equation to generate the well trajectory curve. Taking a directional well as an example, the wellbore trajectories of the wells from 403.9 meters to 976 meters were fitted by PH, cubic spline and linear interpolation method respectively, and compared with the real measuring points. The results show that the wells fitted by PH method, the differences of the bevel angle and the measured point, the azimuth angle and the measured point are 0.910° and 5.7°. The differences of the cubic spline and the measured point, the straight line method and the measured point are 4.240°, 5.86° and 6.54°, 9.09°. For the PH method, the trajectory inclination and azimuth differences are the smallest, which are 3.51% and 3.17%.
Research on roundness error extraction method for precision machine tool spindle based on least square method
Authors: Zhang Shihai
Published: December 2019

Based on the application requirement of online measurement and evaluation for roundness error of precision machine tool spindle, a specific method is proposed to fit the spindle roundness error based on the least square method according to the characteristics of the roundness error. Firstly, aiming to the radial vibration displacement signal of spindle, which collected by the sensor, a multi-harmonic signal with speed frequency of spindle as the fundamental frequency is constructed, and then the least square method is used to fit the amplitudes and phases of each harmonic signals. Finally, according to the fitting results, the rotation error and the interference of higher-order noise signals are eliminated, and the contour signal with only roundness error of the spindle is reconstructed, and then the roundness error of the spindle is evaluated by appropriate evaluation method. The simulation system of rotation and roundness errors separation for spindle system is developed, and the feasibility and accuracy of least square method to fit the spindle roundness error are verified by simulation analysis.
Research and design of a new type of spray washing machine
Authors: Liu Dun , Hu Ruoyu , Zheng Weigang
Published: December 2019

Considering the universality of washing machines today, washing machines consume a lot of water. In order to reduce the water consumption in the washing process and at the same time achieve the effect of cleaning clothes, a new spray type washing machine is designed. It mainly consists of transportation system, cleaning system and control system. The washing system is designed to perform different tasks for washing machines, washing, rinsing and dewatering, respectively. The new washing machine washes clothes with water spray, washing liquid spray washing, high pressure water mist rinsing residue, sponge roller squeezing dehydration and warm air drying, so that the stains of the clothes are washed and the initial dehumidification is completed. The spray-type new washing machine is completely cleaned by spraying droplets and spraying water mist, which can greatly reduce the water consumption.
Research on Bearing Eddy Current Testing Based on ANSYS
Authors: Hu Jianhong , Wang Yufeng , Liang Mingxuan
Published: December 2019

In order to quantitatively analyze the eddy current flaw detection of bearing parts, the eddy current testing model is established by ANSYS finite element simulation software. The simulation analysis object selects a self-inductance eddy current probe. There is only one coil in the probe, which is both an excitation coil and a detection coil, and the detection signal is reflected by the change of the impedance of the coil. Through the simulation experiment, the influence of the structure size of the probe coil and the lift-off distance excitation signal of the probe on the detection effect when using the eddy current detection method for non-destructive testing of the bearing parts is explored. Study and analyze the influence of the change of the defect size on the detected object on the detection signal in the eddy current simulation.
Optimization of control strategy based on equivalent analysis during deployment of Hoop Truss Deployable Antenna(HTDA)
Authors: Cheng Tao , Wang Yihong , Liu Jiangong , Zhang Ke
Published: December 2019

Satellite’s Hoop Truss Deployable Antenna (HTDA) dynamics and controlling, has attracted more and more attention. However, many previous studies were mainly confined to rigid body modelling, which couldn’t reflect the flexible characteristic of the HTDA. By using ANCF, the multi-flexible dynamics system model was established in this paper. After compare with varies strategies, controlling system based on cosine and second-order polynomial was designed in this paper. Complete simulation of the deployment of the HTDA was finished. Modelling method and control strategy are effective and optimized according to the result. The deployment can be controlled precisely by the controlling system and finished smoothly. By this simulation, the rationality of the route planning and validity of control strategy is verified.
Design and test of CF-1A self-propelled residual film recover machine
Authors: Zhang Yaxin , Xiang Jishan , Zhang Hongze , Li Hang
Published: December 2019

At present, although China has developed a biodegradable film, its impact is not ideal that the cost of degradation of the film is higher, and more difficult to promote widely. In order to solve the current problem of picking up the remains of the domestic films, the CF-1A self-propelled residual film recoverable machine is designed. The core components of equipment are the Swing-type residual film picking part and the membrane tooth separation mechanism. The test results have showed that residual film recoverable machine pick-up rate reaches at 82.5% to satisfy the farmers pick-up of the agricultural requirements on the residual film and provides a new idea for the design of the residual film picker.
Rocket Tank Surface Glue Layer Thickness Measurement Robot Trajectory Tracking Control Based on Adaptive Iterative Learning
Authors: Xu Haibo , Li Liu , Ni Yongjun , Liu Siqi , Liu Xiaodong
Published: December 2019

Thickness measurement of surface glue layer of rocket tank is a critical part to ensure the quality of rocket tank. When measuring, the industrial robot equipped with a non-contact thickness measurement end actuator performs measurement tasks along the planned trajectory. Because traditional position tracking algorithm inevitably has hysteresis, the actual trajectory of the control point has a large error with the ideal trajectory, which directly affects the thickness measurement accuracy. Iterative learning controller is used in this paper for trajectory tracking control of rocket tank surface glue thickness measurement robot. Considering the non-repetitive disturbance and time-varying factors in the measurement process, an adaptive iterative learning controller is proposed to improve the trajectory tracking control process of the thickness measurement robot. The effectiveness of the control method is verified by Matlab/Simulink simulation.
New method for the calibration of cutter runout parameters in milling process
Authors: Pan Weiguang , Pan Wenjie , Wu You , Guo Liang
Published: December 2019

Cutter runout will induce irregular rotation radius of each flute and commonly exists in milling process. Duo to the runout inducing great variation of milling forces, it is necessary to accurately identify the runout parameters. In this paper, a new model is proposed to calibrate the cutter runout parameters in flat end milling process. The relationship between the rotation radius of each flute cutting edge and the deviation of maximum uncut chip thickness utilizing the sampled data of cutting forces is made. Several flat milling experiments on a three-axis are made to verify the validity of proposed model and the result shows the predicted cutting forces using calibrated cutter runout parameters having a great agreement with the measured cutting forces in shape under different cutting conditions.
Effect of Cryogenic Treatment on Extruded Copper Structures
Authors: Shengquan Zhang , Bing Wang , Shizhuo Wang , Changzhong Zhao , Xijing Wang , Zhongke Zhang
Published: December 2019

To improve the quality of electroplated copper anodes and reduce the amount of anode mud, it is necessary to further refine copper grains. In the electronics industry, this is typically accomplished by either extrusion or cryogenic treatment. In this study, samples were subjected to different cryogenic treatment periods, and SEM, EDS, XRD, and hardness tests were performed. It was confirmed that a sub-grain boundary was formed due to the disappearance of vacancies and an increase in dislocations after the cryogenic treatment of extruded copper, which improved the grain refinement and hardness. At longer treatment times, the combination and entanglement of dislocations reduced the strengthening effect, and the copper diffraction peaks changed. However, the distribution of trace phosphorus did not change with the grain refinement distribution. Therefore, the results confirm that cryogenic treatment can be used to refine the grains of extruded copper.
Combining the Characteristics of the Field to Determine the Retrieval Ideas and Improve The Retrieval Efficiency of Machine Tool Fixtures
Authors: Xia Baolin
Published: December 2019

Within the field of machine tool fixture, there are many design principles recognized by the industry, and there are many institutions based on industry consensus as the corresponding workpiece clamping. In the process of developing, the search work, the examiner needs to have his own understanding. It is not only based on the specifications of the inherent application fixture. It should be based on the relevant technical perspectives in the field, and understand the design ideas and related principles of the fixture. The specific functions of the components of the fixture are formed as a fixture design principle within the field and retrieved. Through the actual case, combined with the characteristics of the field, the analysis of the fixture design ideas is carried out, and the retrieval ideas of the machine tool fixtures are determined, which can effectively improve the retrieval efficiency.
Fault Diagnosis of the FANUC CNC Lathe Analog Spindle Speed Mismatch
Authors: Yang Dakui , Cao Chuanchuan , Ai Cunjin
Published: December 2019

This paper takes the failure of the spindle command speed and the actual output speed mismatch caused by the CK6136 horizontal CNC lathe (FANUC-0i-TD system) produced by Dalian Dalian Machine Tool Plant as an example. The hardware connection and spindle override of the analog spindle control circuit are described. PMC program design, spindle parameter setting, inverter parameter setting and theoretical calculation of main parameters, etc., and successfully debugged on the CNC lathe in the laboratory.
Study on function evaluation and development directions of Chinese ports
Authors: Yang Qiuping , Wu Jialu , Su Bohan
Published: December 2019

The definitions of a port and of port functions under new circumstances were presented based on the traditional definition of a port, combining economic and social development demands. In order to fully recognize the current situation of Chinese port functions, an investigation into port functions was conducted in Guangdong, Hebei and Shandong etc. Taking the investigated ports as reference samples, generational characteristics, port importance, port throughput, proportion of foreign trade cargo throughput, proportion of container throughput and proportion of container throughput on international routes are chosen as the major investigation objects. Furthermore, qualitative or quantitative partition methods are employed respectively to assess the present situation of ports and development stage of Chinese coastal ports and major river ports. Finally, a basic framework of Chinese port service function system and future development directions are established, combining characteristics of Chinese ports and by drawing lessons from port functions developments in foreign advanced countries.
Analysis On Manufacturing Logistics Network Equilibrium Under the VMI Inventory Management Mode
Authors: Ye Zhou , Zheng Jia-Wen , Wang Yong-Qin
Published: December 2019

The network equilibrium theory is used to study the optimization design of manufacturing enterprises in implementation of VMI inventory management model. In particular, we firstly construct a four tier logistics network, composed of raw material suppliers, spare parts suppliers, manufacturers, logistics service providers. And the network system is modeled, and the profit functions of all levels of decision maker are formalized, and then transformed into the equivalent variational inequality form for computation. Finally, a numerical example is given and some valuable research inspiration are obtained.
Exploring the impacts of online car-hailing service on individuals’ travel behavior
Authors: Yu Wenqiang , Yan Xuedong , Wang Yun
Published: December 2019

Online car-hailing is growing rapidly in popularity worldwide and provides a new travel mode to the urban residents. However, every coin has two sides, it does increase urban mobility while cause some new problems, such as safety concern and privacy issues. Therefore, it is urgent to facilitate the benefits of online car-hailing and avoid the negative impacts at the same time. With this consideration, this paper aims to provide a better understanding of the travel behavior induced by online car-hailing and the modes transfer to it. We apply Hierarchical Tree-based Regression (HTBR) to explore the influencing factors of the inducement and transferring mode, using the data collected by a web-based survey published on DiDi app. The results show that the passengers’ demand for car-sharing is the most significant factor to attract more traversers to use online car-hailing and car ownership mainly influence transferring mode. Finally, we provide some practical suggestions for the city operators.
Prediction of Ship Arrival Quantity Based on Optimized GM (1, 1) Power Model
Authors: Zheng Mingxia , Fan Mengying , Liu Hu
Published: December 2019

Since the ship arrivals is vulnerable to climate, market season, economic development and other factors and is characterized for volatility, the prediction for ship arrivals by means of the conventional GM (1, 1) power model has such problems as low precision, non-relevance between the modeling method and the model testing. In this paper, the optimal matching model parameters for the ship arrival data are found and the GM (1, 1) power model with optimized model parameters is established using the nonlinear programming method, based on the conventional GM (1, 1) power model. Comparisons in term of accuracy in the application of the predictions are made between the ship arrivals data in Cen gang port area of Ningbo - Zhoushan port in May for the last 10 years and the predictions. The predicted ship arrivals for May, 2018 is 860, with an average relative error of 1.67%, and the average relative error of the optimized power model is greatly reduced, which shows that the average relative error of the optimized GM (1, 1) power model has been significantly reduced, with a relative residual not exceeding 7%. The results show that the optimized GM (1, 1) power model is able to further improve the prediction accuracy and meet the actual requirements, providing theoretical support for planning of the port anchorage.
Metro Passenger Flow Statistics Based on YOLOv3
Authors: Liu Weiming , Du Xiaorui , Geng Qinghua , Li Jingning , Li Haiyu , Liu Lan
Published: December 2019

Passenger flow real-time detection in per train compartment is the basis for realizing metro entrance flow restriction, platform waiting guidance and optimizing train departure interval. In this paper, we collect RGB images as the input of the improved YOLOv3 network, then we can get the statistics of passenger flow by detecting and tracking passengers’ heads. For the head detection part, this paper re-selects the number of anchors by using the k-means++ clustering method and removes the large-scale object detection module in the original YOLOv3 network. For the head tracking part, this paper proposes the probability gradient map, IOU-Max maximum matching algorithm and voting strategy, which make the stability of target tracking greatly enhanced. Compared with the original YOLOv3 network, our research results show that the accuracy of head detecting based on the improved YOLOv3 network increases from 90.1% to 97.84%, the recall rate increases from 85.4% to 94.7%, and the accuracy of the head tracking algorithm is as high as 98.87%, and the accuracy of passenger flow density detecting is as high as 95%. The measured detection speed reaches 47FPS on the TITAN X server, enabling real-time fast detection and tracking of targets.
Research and Application of Microcirculation Theory in small cities
Authors: Xi Kuanxiang , Zha Weixiong , Ji Wenqian
Published: December 2019

This paper introduces the traffic microcirculation theory, proposes the innovative traffic microcirculation system theory to control the urban traffic congestion concrete method, applies this method to the small urban traffic congestion area; Taking the Anyi bridge area in Anyi county as an example, this paper analyzes the current situation of traffic congestion in the area, proposes the recent traffic organization optimization plan by using the traffic microcirculation theory, manages the traffic congestion problem in the area of Anyi bridge in Anyi county, and makes a systematic evaluation of the traffic organization optimization plan. Anyi long-term urban development plan, using traffic microcirculation theory method, puts forward of the long-term traffic organization Anyi bridge area, analyzes the forward Anyi bridge area traffic organization, as the forward Anyi bridge area traffic microcirculation system theory method, the city of Anyi road network will be improved greatly.
Quality Assessment Model of Air Traffic Management Service Process Based on TFN-ANP
Authors: Weijun Pan , Haochen Liu , Rundong Wang , Jiahao Tang
Published: December 2019

The ATM operation quality assessment model is the core component of the ATM process quality management. The existing model cannot accurately and completely describe the key indicators of performance in actual work due to the outdated concepts and strong subjectivity. After analyzing the characteristics of ATM process quality, we use TFN-ANP method to establish new assessment model. Each element in this model obtains its own weight and relevance to others. This method further reduces the subjectivity compared with the traditional assessment model. Finally, through the analysis of actual examples, the scientific and practicality of the new assessment model is indicated.