bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Subway Construction Monitoring and Warning System Based on Internet of Things Technology
Authors: Zheng Xuezhao , Guo Hang 
Published: May 2021

Abstract
Aiming at the problems that the low specification, underinvestment and the low professional level of risk management existed in the subway construction at present, analyzed the construction demand of monitoring and warning system for subway construction, a king of subway construction monitoring and warning system based on internet of things technology was proposed. Internet of things, wireless communication, cloud computing and other technologies was exploited to comprehensive sense and monitor of the construction site; Researched the personnel positioning system based on Mesh technology to realize wireless self-organizing network of transmit data and improve positioning accuracy and response speed; By combining the video monitoring with wireless sensing technology, real-time monitoring of field operations was realized, ensure the safety of workers’ lives and “zero hidden danger“ in the field working environment; Data push technology was used to achieve mobile video monitoring, stagewise and classified management, improve the flexibility of safety management.
A new rejuvenating technique for cable localized insulation failures of railway locomotives
Authors: Jia JinJun , Zhao YongXiang , Wang JunGou , Liu ZhiWei 
Published: May 2021

Abstract
A new rejuvenating technique, injection plastic technique with standard scales and over coatings, is developed for restoring the localized cable insulation failures of railway locomotives. The materials of cable jacket and insulation layers are pelt with standard scales around the localized fault location. The failed materials are treated visibly to eliminate hidden perils. Matched moulds with over coating spaces are creatively designed and manufactured for rejuvenating cable insulation and jacket layers materials with injection moulding machine. The policies of standard scales and over coatings can well ensure a reliable rejuvenation, good bound seals and well economic benefits.
Concept of biomimetic mechanical foot based on muscle simulation
Authors: Jin Chaoyue , Xiao Jialuan , Cao Chuqi 
Published: May 2021

Abstract
An concept of biomimetic mechanical foot based on muscle simulation is proposed to solve the problems of biped robots, such as unstable motion and inability to start at a high acceleration. Firstly, the human plantar muscles are mechanically simulated according to the force area and various factors, and the plantar mechanical matrix composed of several mechanical units is constructed. The biped robot collects its own motion state data through sensors, and then processes the data through the control system and issues posture instructions to the plantar mechanical matrix. Finally, the mechanical matrix module adjusts the mechanical unit according to the posture instructions, thereby greatly improving the movement of the biped robot’s stability.
Research on temperature error compensation method of vehicle-mounted laser gyro SINS
Authors: Yang Chen , Cai Yuanwen , Xin Chaojun , Shi Meiling 
Published: May 2021

Abstract
In order to solve the problem that the measurement accuracy of vehicle-mounted laser gyro strapdown inertial navigation system (SINS) is affected by the temperature change, a temperature error compensation method which can adapt to the full temperature environment is proposed. Based on the phenomenon that the temperature of the inertial sensor is still rising when the temperature of the temperature control box is kept, a continuous temperature change experiment is designed. Then, Pearson correlation analysis of the output of laser gyro and quartz flexible accelerometer with temperature, temperature rate and temperature gradient has been carried out. Based on that, the temperature error models of gyro and accelerometer are constructed, and the temperature compensation method based on polynomial model is proposed. The results show that this method could compensate the temperature error of the laser gyro and the quartz flexible accelerometer effectively, and the zero-bias stability of them are both improved, especially the zero-bias stability of the accelerometer is improved by at least one order of magnitude, the accuracy of inertial measurement in full temperature environment is improved effectively.
Experimental study on mechanical behavior of welded joints of strain strengthening austenitic stainless steel under 77K
Authors: Si Jun , Ren Facai , Ren Bin 
Published: May 2021

Abstract
With the development of economy and technology, people’s demand for material properties is developing towards the extreme direction of cryogenic temperature and high pressure. The development of materials with better properties has been widely studied. Austenitic stainless steel S30408 is a typical transformation induced plastic steel, that is, the martensite produced after strain affects the mechanical properties of the material, which will improve the yield strength of the material, effectively reduce the wall thickness. Compared with base metal, welded joint is the weakest link in pressure vessel. Therefore, the research on the mechanical properties of the welded joint of strain strengthening austenitic stainless steel can effectively ensure the safety and reliability of the strain strengthening pressure vessel. In this paper, experimental study on mechanical properties of S30408 welded joints with strain-strengthening were carried out.
Residual Stress Recognition Method for Welded Structures based on An Improved Multiple Differential Empirical Mode Decomposition
Authors: Liu Xiaohan , Shi Guangfeng , Liu Weina 
Published: May 2021

Abstract
To overcome the difficulty in accurately identifying the residual stress of complex large welded parts, a multiple differential empirical mode decomposition (MDEMD) method based on grey mean GM(1,1) prediction and mirror symmetry (MS) extension combined with energy entropy is proposed to identify the residual stress state of components. Firstly, the vibration signal of the welded steel plate is collected by the hammering method and preprocessed by MD algorithm. Secondly, GM(1,1) is used to predict the extreme points at the endpoints and mirror symmetry continuation is used to obtain the intrinsic mode function (IMF). Then, the energy value of IMF component is calculated and normalized by energy entropy, and the characteristic parameters are extracted to realize the identification of the residual stress state. The experimental results show that this method can effectively identify the residual stress state of welded components, and the recognition rate reaches 98.7%.
Intelligent Laser Leveling Control System for Cement Concrete Based on MCU Control
Authors: Wei Xinhua , Huang Shuangcheng 
Published: May 2021

Abstract
With the development of urbanization, cement concrete roads are laying more and more, and the requirements are getting higher and higher. The traditional leveling operation has the disadvantages of high labor cost, long time and poor precision. Based on this, a control system of cement concrete leveling based on laser sweeping technology is designed, and the cement concrete leveling control system based on the laser scanning level is designed. The embedded controller STM32 is used as the control core of the system, the laser horizontal plane scanned by the laser swinger is regarded as the horizontal standard of the leveling system. Two rows of laser receiving sensor arrays mounted on the scraping shovel were used to detect the vertical relative position and tilt of the scraping shovel. The stepping motor driving chip TB67S109AFTG was used to drive two stepping motors to realize the automatic adjustment of the vertical position and inclination of the scraping shovel, and realize the automatic leveling function of the laser leveling machine. Finally, the precision reached 4mm.
Study on opening pressure of hydrocephalus shunt under siphon
Authors: Ji Ping , Dong Quancheng , Wan Min , Yao Xiujun , Shi Kai , Sun Xuan 
Published: May 2021

Abstract
The opening pressure of the hydrocephalus shunt with the siphon device was studied and analyzed in this paper. The influence of fluid velocity and siphon height on the opening pressure of hydrocephalus shunt is analyzed. According to the national medical industry standards, the hydrocephalus shunt must be opened by the liquid column detection method. In this paper, computational fluid dynamics was used to simulate the liquid column pressure, and the interaction analysis of the two factors of flow rate and siphon height was carried out. Finally, the influence of flow velocity and siphon height on the opening pressure of hydrocephalus shunt was obtained in this paper, and the relevant formula of the influence of these two factors on the opening pressure was obtained.
Calculation method of steady-state fault current for offshore wind farm
Authors: Miao Weiying , Gao Houlei , Xu Bin 
Published: May 2021

Abstract
In order to improve the efficiency of solving the steady-state fault current of the offshore wind farm current collection system, In this method, the equivalent model of the PMSG and the VF control converter is established by taking into account the low-voltage ride-through in the case of failure. The Newton-Raphson method is used to iteratively calculate the fault equivalent network. By establishing a simulation model under PSCAD, the symmetric and asymmetrical faults in the collector system of a grid-connected permanent magnet wind turbine connected to the VSC-HVDC are simulated. Simulation results verify the effectiveness and accuracy of the calculation method.
Study on dynamic characteristic optimization of virtual inertia control for the grid-connected converters in DC micro grid
Authors: Wang Xue , Yang Tingyu 
Published: May 2021

Abstract
In order to reduce the transient time and voltage deviation due to voltage variation while increasing the system inertia of the DC microgrid, a new adaptive control method for the parameters of the grid-connected end is proposed. Firstly, a grid-connected converter control strategy mathematical model is established. Secondly, the influences of different control parameters on the dynamic characteristics of the system are studied. An adaptive equation based on the parameters of voltage deviation and voltage change rate of DC bus is proposed. Finally, through MATLAB/Simulink simulation, the simulation results of the traditional drooping control, the virtual inertial control with fixed parameters and the control strategy proposed in this paper are compared and analyzed. The result shows that the proposed control method has better dynamic characteristics.
Quadric Lyapunov Algorithm for Stochastic Networks Optimization with Q-learning Perspective
Authors: Li Hu , Zhang Xinguang , Bai Jinliang , Sun Heng 
Published: May 2021

Abstract
In this article, we investigate stochastic networks optimization using Quadric Lyapunov Algorithm (QLA) with Q-learning perspective. We proposed firstly a model of stochastic queueing networks with power constraints. QLA is then proposed aiming at minimizing an expression containing Lyapunov drift. Based on the analysed similarity between QLA and Q-learning, we show the possibility and feasibility of Q-learning. Simulation of a simple queue network model is carried out, and results using both QLA and Q-learning are compared.
The Influence of Different Constitutive Model Relations on Mechanical Behavior of Crack Tip Plastic Zone
Authors: Shao Xiaolin , Wang Jing , Zhang Yan , Huang Huiru 
Published: May 2021

Abstract
For ductile materials with cracks, when the stress at crack tip exceeds the yield strength, a plastic zone will be formed around crack tip. In this paper, the extended finite element method(XFEM) in ABAQUS was used to simulate the crack, and the mechanical behaviors of crack tip plastic zone under different constitutive models were studied by taking the three-point bending specimen as the research object. The COD experiment and theoretical verification of three-point bending demonstrate the effectiveness of this method. The effect of the plastic modulus on size of crack tip plastic zone under the double broken line constitutive model is analyzed, and the effects of the load on plastic zone size and stress distribution near crack tip under the true stress-strain constitutive model is discussed. Finally, the difference of stress distributions around crack tip obtained from two constitutive models is compared.
Design of functional electrical stimulator for foot drop rehabilitation
Authors: Wang Jinxiang , Zhang Yulin 
Published: May 2021

Abstract
This paper designed a functional electrical stimulator controlled by STM32F103 microprocessor for the rehabilitation of foot drop patients. The frequency, pulse width, period and other parameters of the electrical stimulator are set by the upper computer and transmitted to the remote controller. The remote controller then controls the lower computer to adjust the stimulus intensity through Bluetooth for electrical stimulation treatment. The electric stimulator outputs the stimulus current through the boost control circuit and the constant current output circuit. The results show that the functional electrical stimulator can adjust the therapeutic pulse in the range of 0-100mA current intensity, 17-40Hz frequency and 100-300μs pulse width. The design is easy to use, high degree of automation, easy to use in the home and hospital.
Design and experiments of a bio-inspired tensegrity spine robot for active space debris capturing
Authors: Feng Xiaogang , Wu Zhigang , Wang Zijie , Luo Jiahui , Xu Xiaoming , Qiu Zhoujingzi 
Published: May 2021

Abstract
Aiming at active space debris capturing, this paper proposes a novel tensegrity spine robot, inspired by the structure and mechanism of vertebrates’ spine. It consists of a series of conical rigid elements, which are linked with springs and stabilized in a tension network. The continuous bending of the robot is achieved by the actuation of three sets of cables. A prototype is built and a closed-loop control method is proposed for proof-of-concept experiments, including bending motion control, capturing a non-cooperative target, and tests of load performance. The experimental results show that the proposed tensegrity spine robot has potential application prospects in space debris capturing.
Design of the blow-drying device for gearbox housing based on stm32 microcomputer
Authors: Yang Xiaoyan , Hou Xujie , Wang Yanyan , Zhang Qiang 
Published: May 2021

Abstract
Based on STM32 microcontroller, the design scheme of the gear box shell drying device is proposed, and the design framework and software design flow of the device are given. On the basis of high-performance MCU, the device can automatically complete the intelligent drying of the gearbox shell, and can carry out the secondary recovery of cutting fluid. At the same time, the device is equipped with a monitoring system, which can monitor the internal influencing factors according to the specified requirements, so as to achieve the goal of safety and efficiency.
On-line detection device for high temperature forgings based on laser triangulation
Authors: Bian Shaoshun , Zhou PengZhong , Xu Jiawei , Zhang Jin , Shan Debin 
Published: May 2021

Abstract
This paper takes the online detection equipment of high temperature forgings in the forging environment as the research goal, and uses laser triangulation to perform 3D point cloud imaging of high temperature forgings, and then conducts online detection of the defects, temperature, position, size and other parameters of the forgings. Real-time information feedback of measurement results, and timely adjustment of forging equipment and improvement of production process routes based on the feedback results, thereby effectively improving forging accuracy and forging efficiency, and reducing the work intensity of workers.
Optimal Design of Flexspline in New Modular Robotic Joints Considering Position Keeping Conditions
Authors: Luo Yuyang , Li Zhaoyang , Wu Hongyu 
Published: May 2021

Abstract
In order to improve the service life of modular joints and meet the requirements of compact structure, considering the position keeping conditions of modular joints, a multi-objective optimization design method for the maximum stress and tube length of the new modular joint flexspline was proposed. This method established a finite element analysis model based on a new modular joint structure, conducted a thermo-mechanical coupling analysis on the joint under the holding state, and obtained the stress distribution of the flexible wheel. Plackett-Burman factorial design was used to screen the significant factors that affect the maximum stress. Based on the Box-Behnken test method and the least square method, the second-order response surface approximate model of the maximum stress of the flexspline was established. Taking the geometric structure parameters of the harmonic drive components as the design variables, and the maximum stress and tube length of the flexspline as the design goals, the response surface approximate model is optimized through the multi-objective genetic algorithm. The optimization calculation example of the new modular joint shows that the method can reduce the maximum stress of the flexspline while reducing the tube length, achieving the purpose of reducing the joint volume and increasing the service life.
Design of Geopolymer for Removal of Nitrogen in Industrial Wastewater based on Artificial Intelligence Technology
Authors: Yu Yangmei 
Published: May 2021

Abstract
In the era of big data, as an essential direction of international development in the next few decades, artificial intelligence has an extensive application suitable for all fields of life. Nowadays, artificial intelligence technology is also integrated into production and life. As a new unique material, geopolymer has been widely used thanks to its properties. Due to their special network structure, geopolymer materials have a higher temperature and mechanical properties than other materials, such as cement, ceramics, and metals. The experiment results show that the artificial intelligence technology is very suitable for the geopolymer design for nitrogen removal from industrial wastewater, and the satisfaction is as high as 72.3%. In this paper, industrial wastewater is used as raw material for nitrogen removal, and the future development direction of geopolymer research is analyzed. We hope to provide a novel way for the utilization of industrial wastewater.
Sand Bar Evolution Process Numerical Simulation Analyze Based on two Dimensional Numerical Model
Authors: Jiang Caodong , Ma Liangchao , Li Dongfeng , Zhang Hongwu , Li Zihao 
Published: May 2021

Abstract
The sand bar lies near the entrance to the sea, which is not only detrimental to the flood discharge and sediment discharge of the river, but also an important factor causing the swing the flow path to the sea. With the formation and development of the sand bar, the form of the sand bar is constantly changing, the river is expected to extend continuously, and the water level and velocity of the estuary river change within a certain range, thus affecting the estuary flood control and river management measures. It is of great significance to study the development process of sand bar and its form for flood control of estuarine rivers and to put forward reasonable control measures of the sand bar. The sediment inflow into the sea is calculated by using the validated two - dimensional numerical model of estuarine and rivers. In this paper, the variation and development process of the sediment form with time and space are analyzed from the following aspects: the process of sediment deposition thickness into the sea, the distribution chart of sediment deposition thickness along the direction of water flow into the sea, the process chart of seabed deposition height, the variation of intraday flow velocity along the sea and the analysis of the temporal and spatial variation of sediment concentration, etc. The calculated and analyzed results are consistent with the measured data.
Research on Intelligent Campus System Design Based on BIM & VR/AR Technology
Authors: Wu Bei , Hao Ruoyan , Li Huanyu , Chai Qian , Wang Yaning 
Published: May 2021

Abstract
With the new form of social development dominated by Internet technology innovation, more and more domestic colleges and universities are applying virtual reality technology to the construction of smart campuses. This method of combining virtual reality and augmented reality (VR & AR) technology with smart campuses has realized campus The goal of informatization, intelligence and visualization.
Parameter identification of general damping model based on structural dynamic response
Authors: Sun Qian , Zhang Kun , Ju Jianmin 
Published: May 2021

Abstract
A general damping model suitable for linear systems is proposed, which is not limited by the traditional damping model, and the parameters of the damping model are identified by using the inversion algorithm based on the sensitivity of the structure dynamic response. Firstly, the expression of the general damping model is constructed, and the sensitivity formula of the dynamic response of the structure to the parameters of the damping model is deduced. Then, the identification equation of structural damping parameter inversion is constructed, and the regularization method is used to solve the equation in an iterative way. Finally, the applicability and identifiability of the general damping mathematical model are verified by taking a 12-story shearing frame as an example. The numerical simulation results show that the general damping mathematical model has higher accuracy than the classical damping model in damping parameter identification and dynamic calculation.
Research on calculation model of Tower Impulse resistancebased on EMTP
Authors: Hongtao Ren , Yi Li Chen 
Published: May 2021

Abstract
Accurate determination of impulse grounding resistance of tower grounding body is the premise to improve the lightning withstand level of transmission line. The current research mostly ignores the nonlinear effect of soil spark discharge. Based on the analysis of the idea and conception of the equivalent model of grounding body considering spark discharge effect, two simulation models based on EMTP are proposed. The two simulation models can well simulate the inductance effect and spark discharge effect when lightning current flows through grounding body, and improve the grounding body model under impulse condition. The comparison results show that the simulation results are in good agreement with the field measurement results.
Design and Simulation of Sandwich Structure of Exoskeleton Backplate Based on Biological Inspiration
Authors: Peng Xuefeng , Dai Zongmiao , Liu Jiasheng , Wang Yongyuan 
Published: May 2021

Abstract
The backplate is the main skeleton of the exoskeleton robot, and its structural strength and lightweight design are very important to the body structure of exoskeleton. In this paper, a design scheme of grille reinforced foam sandwich structure based on biological inspiration is presented. By analyzing the influence of core thickness on the mechanical properties of the sandwich structure, a new sandwich structure of exoskeleton backplate with a surface thickness of 2mm and a core thickness of 15mm was designed. Based on finite element software ABAQUS, the simulation calculation was carried out. The results show that the maximum stress of the sandwich structure is 298.5Mpa and the maximum strain value is 2730με, which is less than the allowable value. This meets the structural strength design and lightweight design requirements.