bluuebunny/crossref_metadata_2025_split huggingface dataset:
Thermal Analysis for Lithium-Ion Battery Pack based on Parameter Estimation based on Genetic Algorithm
Authors: Wang Yong , Deng Yelin , Liu Weiwei , Hao Kunkun , Zhang Hongchao 
Published: April 2020

Abstract
Thermal analysis of Lithium-ion battery pack is the important portion of battery management for electric vehicles. The heat produced in charging and discharging will bring about impairment of the safety and service life of batteries. It is thus important to monitor battery temperature for prevention of the battery failure. This paper first sets up a simulation model based on the second-order RC circuit model of the heat generation and dissipation of the battery pack using SIMULINK. The temperature of the battery pack is tested under The New European Driving Cycle conditions. And by comparing with the experimental data of the battery temperature, the heat dissipation coefficient in the simulation model will be optimized by the genetic algorithm using MATLAB. The optimization result shows that the difference between the simulated temperature and the actual temperature is within one degree, so the model based on the optimization result can accurately reflect the actual temperature change.
Studies on Overheating Fault of Disconnecting Switch
Authors: Lan Zhijun , Wang Yaping , Wu Jianling , Fan Yongqiang 
Published: April 2020

Abstract
This paper mainly presents typical solutions to disconnecting switch overheating and mechanical problems of power grid in Extra High Voltage (EHV). In recent years, many faults have happened in the EHV power grid due to overheating and mechanical problems of disconnecting switches in Inner Mongolia. Dust storm weather and the special structure are main reasons which induced disconnecting switch lower operation reliability. For the overheating problems, the solutions include using conducting metal belt, replacing material of knee-arm wheel and modifying the structure of rolling-contact assembly; for the mechanical problems, the solutions include using dust shield, renovating operating mechanism and decreasing mechanically-driven part. Meanwhile suggestions are proposed as well for the design and application of isolator in the power networks of Western Inner Mongolia and the Northwester China which have similarly peculiar natural environments.
Development of a New Wax Scraper
Authors: Xie Lu , Liu Yangyang 
Published: April 2020

Abstract
Wax removal and prevention in oil wells is an important work in field management. This paper introduces the process of developing a new type of loose-leaf wax scraper by using TRIZ method. At the same time, 48 schemes, 33 feasible schemes and 5 patent plans have been obtained by using this method, and certain economic benefits have been obtained.
Supply network Optimization Based on Supper Efficiency Non-dominated Sorting Genetic Algorithm
Authors: Wang Yadong , Shi Quan , You Zhifeng , Li Lei , Zhang Fang 
Published: April 2020

Abstract
In order to optimize the supply network, a multi-objective constraint optimization model is established with the constraints of demand satisfaction, lead time and inventory capacity, aiming at minimizing total supply time and the supply costs. By using the proposed upper efficiency non-dominated sorting genetic algorithm, the set of non-dominant solutions are obtained. During optimization process, the upper efficiency data envelopment analysis (SE-DEA) is used to calculate the supper efficiency of the non-dominant solutions. In this way, on the one hand, the algorithm is guided to converge to the optimal efficiency individuals. On the other hand, the non-dominant solutions are sorted to select the optimal one. The example shows that 16 non-dominate solutions are obtained by using proposed algorithm, and the solution with supper efficiency of 0.9538 is determined as the optimal scheme.
Control-oriented representation method of assembly process for intelligent assembly system
Authors: Liu Yan , Zhang Zhijing , Guo Pengyue , Wang Lei 
Published: April 2020

Abstract
This work put forward a new idea of reconfigurable control of assembly process with a modular assembly control schedule (ACS) as system input and a series of automatic assembly actions of terminal execution units as system output. Based on this, an assembly process representation mechanism for reconfigurable control of intelligent assembly system is proposed, which provides an important basis and support for the further optimization and control of assembly actions. Firstly, the concepts of process meta-action (PMA) and control meta-instruction (CMI) of assembly were proposed, and the assembly process was decomposed into multiple PMAs by PSA (Procedure-Step-Action) decomposition method. Then, oriented to the control of assembly actions, PMAs were symbolized. Finally, the assembly of a micro gear was taken as a case study, and this work has been used to schedule the assembly actions of an actual micro-assembly system.
Thermal control technology for the space station adjoint modular satellite based on new thermal control materials
Authors: Hu Guojie , Chen Yujun , Wang Min , Liu Bailin , Yan Senhao 
Published: April 2020

Abstract
A modular satellite could perform various functions with various modules and the function of the satellite could be expanded easily. Therefore, the modularization design is an important development direction of space station adjoint satellites and others. However, every module of a modular satellite is structurally independent and the heat dissipation is unevenly distributed, while the interface between modules should support repeatable connection-separating. The traditional thermal control design could not satisfy the thermal control demand. In this paper, the thermal control technology for the space station adjoint modular satellite based on the thermal interface of carbon nanotube array on copper substrate, graphene coating and smart thermal control coating is proposed. By using the new technology, the thermal connection of the assembly and reconstruction system is built and the synergistic heat dissipation of the whole satellite is achieved. As to validate the proposed technology, the finite element model of the space station adjoint modular satellite is established and the whole flight process is simulated. The result indicates that the thermal control technology proposed in this paper can satisfy the thermal control demand of the modular satellite.
Research on Ship Fault Diagnosis Based on Deep Learning
Authors: Zhu Jun , Wang Lei , Zhang Di 
Published: April 2020

Abstract
This paper proposes a deep learning algorithm to diagnose ship faults in order to improve the accuracy and diagnostic efficiency of ship fault diagnosis. 90% of the large number of unlabeled ship operational data samples are selected for model training, and the remaining 10% is used for model testing. We optimize model parameters and improve the accuracy of the deep learning model for fault diagnosis classification. Hidden layer functions are used to extract multi-layer data features and perform feature fusion. Gain values are used to define ship faults, primary faults, secondary faults, and tertiary faults. Finally, we use the soft-max classifier to fault output the fault and get the fault level output. The experimental results on the ship simulation fault dataset show that compared with other traditional algorithms, the accuracy of the fault diagnosis of this method is greatly improved, and the simulation result is 92.5%. Experiments show that the model based on deep learning algorithm for multi-layer feature fusion training can better meet the needs of ship fault diagnosis under complex systems.
Side parking device based on automobileautomatic force drive
Authors: Qin Jiarui , Wei Cancan , Xiong Xinhong 
Published: April 2020

Abstract
With the development of China’s economy and the continuous deepening of urbanization, the number of urban private cars has increased dramatically [1]. However, the planning of the community construction was relatively backward at the beginning, this has resulted in many residential areas, especially the old-fashioned ones. The problem of difficult parking is becoming increasingly prominent. Therefore, it is very necessary to design a parking device that can effectively use the existing space and create more parking spaces. In addition, efforts are made to reduce the manufacturing cost of the device, save energy for product operation, avoid complicated maintenance of the device, and reduce potential safety hazards during use. The project team designed a side parking device based on the automatic driving force of the car. The device includes a vehicle-carrying walking module and a motion module. The vehicle-carrying walking module is composed of a laterally-movable vehicle-carrying platform device and a safety baffle mechanism, which realizes the lateral movement of the car parking and prevents accidents during the car parking process. The motion module is composed of a cross-cut telescopic mechanism, a transmission mechanism, a driving mechanism, and a ratchet and pawl mechanism, which realizes the functions of parking the car in the warehouse and preventing the car body from slipping. After many discussions, the members of this project team have fully studied the problems of the existing parking devices and the parking difficulties faced by the old-style residential quarters, the project team decided to start from two aspects: first, to overcome Insufficient; then, to meet the actual needs of parking in the community [3].
Fault diagnosis of mechanical spindle drive chain based on time-frequency domain characteristics
Authors: Zhao Guobo , Chen Xuezhen , Li Ying , Pan Shilu , Dong Guangliang , He Yi 
Published: April 2020

Abstract
As a key component of CNC (computer numerical control) machines, spindle’s performance directly affects the performance of machines. The mechanical spindle, which is often used in the processing of complex aeronautical structures such as titanium alloys, has the characteristics of large torque and impact resistance. However, its long drive chain and complex structure make it difficult to effectively forewarn and diagnose its faults. In this paper, a fault forewarning and diagnosis method is designed, which is based on the analysis of characteristics of vibration time-frequency domain of mechanical spindle. Firstly, a method for calculating the frequency characteristics of key components in the drive chain of mechanical spindle is proposed, and the signal characteristics of vibration are obtained. Secondly, according to the position and layout of each component in the spindle drive chain, the layout scheme of signal acquisition points is designed based on the principle of point-to-surface integration. This scheme ensures that the signals of each point can not only reflect the state of the spindle, but also reflect the vibration characteristics of different parts. Variable speed test is carried out on different equipment of the same type, and the signals processed by Fourier transform, and the frequency domain signals at different speeds are obtained. The time-frequency signal of the spindle is analyzed to find its vibration characteristics. Combining with the results of theoretical calculation, the working state of the spindle and the working performance of each component, as well as the specific fault parts and types of fault are obtained. Through experimental verification, the method proposed in this paper effectively improves the ability of working state monitoring and fault diagnosis of the spindle system.
Investigation into convective heat transfer of nanofluids at the thermal boundary layer development region in micro-channels
Authors: Wang Shuxiang , Xu Li , Tong Junjie 
Published: April 2020

Abstract
The convective heat transfer at the thermal boundary layer development region in microchannels was theoretical and experimently investigated with de-ionized water and Al2O3-H2O nanofluids as the working fluids. It was found that nanofluids could effectively decreased the wall temperature and improve the heat transfer coefficient compared with the de-ionized water at the thermal boundary layer development zone. When the serious agglomeration of nanoparticles didn’t appear, increasing the concentration of Al2O3 nanoparticles could effectively increase the heat transfer enhancement effect. And the local heat transfer coefficient increase amplitude by using the nanofluids decreased along the direction of refrigerant flow. At the thermal boundary layer development zone, higher inlet velocity would get the larger increase amplitude of the heat transfer coefficient. At the thermal boundary layer development region, lower heat flux could achieve more pronounced heat transfer enhancement by nanofluids. When the thermal boundary layer developed, the heat transfer enhancement by nanofluids decreased and affected by heat flow become weak. When the mass flow rate increases, the better improvement can be achieved by nanofluids in the micro-channels. The nanoparticles have greater impact on local heat transfer coefficient in thinner thermal boundary layer, leading to the heat transfer enhancement is better at the thermal boundary layer development region in micro-channels.
Research on multipath suppression performance of multiple BOC signals of navigation satellite
Authors: Wang Yan , Zhao Wei , Shen YangHe , Yu Su 
Published: April 2020

Abstract
BOC(Binary Offset Carrier) signal is a kind of navigation satellite downlink signal. Compared with BPSK(Binary Phase Shift Keying) modulation signal, it can improve the multipath suppression performance of navigation system. BOC signal modulation includes a variety of extended signal modulation modes, including TMBOC(time-multiplexed BOC), AltBOC(Alternative BOC) signals, etc. It is an important subject to study the performance of multipath suppression of various BOC signals. In this paper, the multipath error model is constructed by using the noncoherent early-late processing track loop, the performance of multipath suppression of TD-AltBOC(Time Division Alternative BOC) and AltBOC signals for different front-end bandwidth of the receiver is analyzed. By studying the average multipath error and envelope value of AltBOC (15,10), BOC (1,1) and TMBOC (6,1,4/33) signals, the performance comparison results of three kinds of BOC modulation are given. In order to verify the research results of multipath suppression performance, the receiver is used to receive the signals of different BOC modulation systems transmitted by navigation satellite, The multipath error is obtained by the combination of dual frequency pseudo range and carrier phase. The experimental results show that AltBOC (15,10) has the best multi-path suppression performance, followed by TMBOC (6,1,4/33), and BOC (1,1) has the worst multi-path suppression performance compared with the others, which proves the correctness of the research results of multi-path suppression performance of various BOC signals.
Dynamics analysis of planar linear array deployable structures with multiple clearance joints
Authors: Li Bo , Liu Hong Zhao , Zhang Jia Hua 
Published: April 2020

Abstract
The purpose of this paper is to investigate the dynamic characteristic of the scissor linear array deployable structure under the coupling action of clearance joints, where the kinematic model of the deployable structure with clearance is established according to the principle of the motion between joint elements. The normal and tangential contact forces between contact components are respectively described using the Flores contact force model and modified Column friction model. In the sequel of this process, the impact forces between the connected components are converted to the mass centers of links connected by this clearance joint, and the converted contact force and additional torque were integrated to the generalized force in motion equations of the deployable structure, and then the effect of joint clearance is introduced to deployable syetem. The simulation results show that the dynamic characteristics of the mechanism are very sensitive to the clearance position, and the movement of a joint clearance will affect the movement of the other joint clearance, which shows that clearance joints in deployable structure have a strong dynamic interaction and all the joints should be modeled as real joints.
Research on Air Pressure Cycle Test of Liquefied Petroleum Gas Cylinder
Authors: Jia Songqing , Han Bing , Dai Xingtao , Bo Ke , Wei Zhihao , You Hongxin 
Published: April 2020

Abstract
Air pressure cycle tests were performed on liquefied petroleum gas (LPG) high-density polyethylene liner glass fiber fully wound cylinders. During the repeated filling and discharging of the gas cylinder, the changes of the internal and external surface temperature and internal pressure of the gas cylinder with time were obtained. Through experimental analysis and numerical simulation, the characteristics of the flow field in the cylinder during the pressure cycle test at different pressure cycle rates were studied. The results show that the temperature in the gas cylinder rose steadily during the test. The temperature rise trend of the gas cylinder in Fluent simulation was the same as that in the test. In the air pressure cycle test, the temperature change of the cylinder was larger than that of the cylinder when it was filled with LPG, and the structure and material properties of the cylinder were unchanged. This test can check whether the LPG high-density polyethylene liner glass fiber fully wound cylinders are safe.
Safety performance optimization of front bumper system based on pedestrian lower leg protection
Authors: Zhong Jiabin , Shi Baijun , Zhang Yihuai 
Published: April 2020

Abstract
Taking the front bumper system of a passenger car as the research object, a finite element model of pedestrian lower leg collision was first established, and the tibial acceleration at Y400 was found to be high in the performance analysis. Second, the sensitivity analysis was performed on the main parameters of the bumper system to determine the skin Thickness and foam density are the main influencing variables. Finally, a performance improvement scheme is proposed, and the lower leg tibia acceleration is reduced by 47.71% after the improvement, indicating that the scheme is conducive to lower leg protection.
Task maintainability evaluation of complex system based on simulation
Authors: Song Mingchang , Shi Quan , Wang Yadong 
Published: April 2020

Abstract
In view of the problem that the randomness of maintenance time of functional units cannot be considered in traditional system maintainability evaluation, this paper firstly analyzes the general process of system task maintainability evaluation and determines the basic method of task maintainability evaluation. Then, aiming at the problem that it is difficult to solve the problem analytically when several functional units fail at the same time, a task maintainability evaluation algorithm based on simulation is proposed. Finally, an example is given to illustrate the effectiveness and practicability of the proposed method.
Numerical simulation of the flow in a vertical vane type tank with micro downward acceleration
Authors: Liu Jintao , Li Yong , Li Wen , Chen Lei , Bi Qiang 
Published: April 2020

Abstract
Vane type propellant tank is widely used in propellant system of satellite at present for that it can be refuelled in space. The performance of a vertical vane type tank is determined by propellant management device (PMD). The VOF model with commercial code (Fluent) was used to simulate the gas-liquid distribution with micro downward acceleration. Two kinds of volume fractions of liquid were chosen for the simulation. The flow rate of the liquid can reach 1300 ml/s. The potential energy caused by gravity for the initial conditions would be released in three seconds. The liquid in the tank would keep steady state in 28 seconds. These results could provide a reference for high acceleration maneuvers of a satellite.
Research on Postal Dispatching System at Multiple Transfer Points of Postal Containers Based on Genetic Algorithm
Authors: Liu Min , Meng Jie , Li Guangping 
Published: April 2020

Abstract
In this paper, a new comprehensive algorithm is proposed to solve the problem of postal dispatching at multiple transfer points of postal containers, and based on this, a postal dispatching system of postal transfers at multiple transfer points is established. In this system, Floyd algorithm combined with fuzzy judgment to find each key route, and to combine linear programming to set a small step size for the far three points on each key route, so as to realize the area planning and design of key points. Finally, the genetic algorithm is used to solve the postal planning of the remaining points in the area. To optimize the system, the compensation principle is used to carry out post and mail planning at nearly three points in the area and complete the post and mail planning for the entire area.
Design of self - diagnostic sensor and ordinary sensor signal combination device
Authors: Li Yuliang , Zhang Lihong , Zhou XiaoZhong , Lou Weidong 
Published: April 2020

Abstract
A device is designed to combine the signal of self-diagnosis sensor and ordinary sensor. The device comprises a high-speed optocoupler, a single-chip microcomputer and an output drive circuit. The high-speed optocoupler is responsible for collecting the level state of the signal of the self-diagnosis sensor and the signal of the ordinary sensor. Micro Controller Unit (MCU) is finally combined with the results of the operation and the self-diagnosis sensor signal state, real-time maintenance or the test results of the output drive circuit. The output drive circuit amplifies the control signal sent by the single-chip microcomputer to enhance the driving ability of the output signal; This device can intelligently identify the external input signal, and then perform the operation of and or merge with the external input signal, and output the control signal with diagnostic pulse according to the level state of the input channel.
Trusts Reimagined: The Transplantation and Evolution of Trust Law in Northeast Asia
Authors: Wu Ying-Chieh 
Published: April 2020

Abstract
This Article suggests that the trust envisaged by a Northeast Asian lawyer is not like the trust a common lawyer would generally conceptualize, and that a structurally different species of trust has been reconstructed and reimagined in Northeast Asia. Trust law can be transplanted, yet some of its rules are too cumbersome to be accepted directly. This ultimately calls for modifications of some of the features of the common law trust, which happened in Northeast Asia when trust law was transplanted into Romano-Germanic civil law culture, culminating in a type of civil law trust. This Article explains how the doctrinal conflicts between the civil law tradition and the common law trust have been resolved by examining the transformations that took place in the course of the transplantation process and how these conflicts created a distinctive underlying structure of the trust in Northeast Asia. Many compromises and modifications were made to pare down conflicts arising from grafting the common law-based trust onto Romano-Germanic soil. However, adopting modified trusts unexpectedly led to the dilution of some of the traditional rules in the civil codes. These alterations and the ensuing discordance with some presently well-settled civil law theories are the core themes of this Article.