bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Smart Electricity Meter Based on LoRa Technology
Authors: Yang Yang , Zhang Chuang , Yan Weiwei , Liang Qinci , Xuan Minsheng , Guo Shuai 
Published: March 2022

Abstract
For the current wireless communication methods of smart electricity meter, the communication cannot simultaneously take into account low power consumption and long distance. In this paper, the smart electricity meter based on LoRa technology is studied, using FM3308 chip as the control core, achieving low-power and long-distance communication through LoRa technology, and the nti-interference design is carried out from both hardware and software aspects. The research content of this paper realizes the coexistence of longdistance transmission and low power consumption of smart electricity meter communication, and maintains the better anti-interference ability of smart electricity meter, which is conducive to the realization of long-distance centralized meter reading behavior and can greatly reduce the arrangement of repeaters, reduces the cost investment while lowering the design requirements and helps to promote the construction of smart grid.
Flat Currents and Solutions of the AdS
3 × S
3 Superstring
Authors: Zhang Lixia , Li Lei , Miao Zheng , Fan Qi 
Published: March 2022

Abstract
For the covariant K-symmetric Green-Schwarz superstring action on AdS
3 × S
3 background, we show that Cartan one-forms associated with the flat currents satisfy not only the equations of motion but also the Virasoro constraint. So the flat currents with the spectrum parameter would make for a succession of classical conserved solutions ,which have the similar inexhaustible series of classical conserved quantities.
A New Generation of Hardware-in-the-loop Simulation Technology Combined with High-performance Computers and Digital Twins
Authors: Shi Yehui , Cheng Yuqiang , Gao Yushan 
Published: March 2022

Abstract
Liquid rocket engines are complex equipment with long maintenance cycles and high fault diagnosis costs. Therefore, hardware-in-the-loop simulation combining software and hardware has become the best choice. A hardware-in-the-loop simulation platform framework is proposed based on a V-type development model and related digital twin technology, and the main content of the framework is introduced. Based on the development process of the platform, a certain type of liquid rocket engine is taken as the object to verify the results. The results show that the platform can well simulate the engine changes under different faults, and has versatility and high real-time performance.
An Intelligent Multi-turn Dialogue Classification Method Based on Resampling
Authors: Guo Ming , Zhang Yunju , Yang Qiang , Shen Guangyou 
Published: March 2022

Abstract
Intelligent multi-turn dialogue classification uses the whole text as input to predict tags. As one of the most popular research topics in dialogue system, intelligent multi-turn dialogue classification has important research significance in academia and industry. In this paper, we focus on removing redundant information from dialogue text. Multi-turn dialogue classification is essentially a text classification problem. We selects Bert as the core model of multi-turn dialogue classification in view of its strong learning and redundancy removing ability. However, Bert limits the length of its input to 512 and the length of dialogues often exceeds 512. A long text segmentation method based on resampling is presented to solve the problem of input length limitation. The resampling mechanism can also further remove the redundant information in multi-turn dialogues. Experimental results show that the proposed method outperforms all the baselines and achieves an F1 of 53.91%.
Research on Mini-EfficientDet Identification Algorithm Based on Transfer Learning
Authors: Liu Chao , Lin Shouying 
Published: March 2022

Abstract
In this research paper, the Chinese beehive culture in Fujian Province, China is used as the carrier, and the Mini-EfficientDet deep neural network after migration is used to identify common species at the hive door, that is, the identification of Chinese bees, wasps and cockroaches in the form of nymphs. In this paper, we define the modified model as Mini-EfficientDet by compressing the initial EfficientDet model and adding the category imbalance function, which makes it focus more on the recognition and classification of small targets while ensuring the recognition accuracy. Through the test on the MSCOCO2017 data set, it is concluded that when the backbone network adopts EfficientNet B7, it shows strong detection accuracy in detecting targets of various scales, which confirms the role of the category imbalance function proposed in this paper and the efficiency of the improved EfficientDet model. Detection accuracy. The pre-trained model is transferred to the field of beehive species detection through migration learning, that is, after the post-training of the self-collected data set, the detection accuracy of Chinese bee, cockroach, and wasp is 98.66%, 83.71%, and 82.06%. It has made sufficient algorithmic preparations for the later detection and early warning system of beehive species invasion.
Automatic Detection of Avionics Electrical Connector Pins
Authors: Zhang Xiaolin , Wu Hanqing , Wu Yanxiang , Cao Lei 
Published: March 2022

Abstract
Avionics electronic connectors have a wide use and play a significant role in instrumentation and aerospace system. To substitute manual detection, we propose an automatic in-station connector pin detection system based on computer vision, machine vision, deep learning, and industrial robots. This system provides a high-reliable, high-accuracy, traceable, quantifiable, and real-time detection for connector pins.
Practical Application for Reactor Installation to Reduce Harmonics Resonance of Steel Factory
Authors: Hasabelrasul Hashim , Cai Zhenjiang , Kamal Mohaned , Sun Lei , Suo Xuesong 
Published: March 2022

AbstractHarmonicis one of the problems in the power system. It needs more focus due to the number of electrical devices that generate a considerable amount of harmonics. In this paper, a reactor was designed, installation and implementation for a steel factory. The installation objective is to solve harmonic resonance and reduce billing penalties for reactive power KVA by the electric power utility—technical analysis applied to the factory main panel. The ETAP software is used to discover the problem and evaluate the solution results. The power flow and harmonics analysis of an 11 kV system is modeled and implemented. Finally, the proper reactor was calculated and installation as practical to solve the harmonic and economic issues.
Design and Analysis of a New Cooling Structure for Interior Permanent Magnet Synchronous Motor with Built-in Fan
Authors: Wang Jin , Chen Lihui , Yu Zhanyang , Wang Zicheng , Li Yan 
Published: March 2022

Abstract
Aiming at the overheating problem of interior permanent magnet synchronous motor (IPMSM) for compressors due to the limitation of working environment, a new type of IPMSM with built-in fan based on the axial ventilation cooling structure is proposed. Firstly, an axial fan is installed inside the rotor without affecting the electromagnetic performance of motor, and the air velocity distribution and temperature distribution characteristics inside motor are analysed by computational fluid dynamics (CFD). Secondly, the influence of the position of the inlet and outlet on the heat flow distribution is analyzed. Finally, for the problem that the heat dissipation effect of the ventilation slots on casing is not obvious, the ventilation slots are removed and the air outlets are installed on front cover. And the results of heat flow characteristics show that this cooling structure is optimal.
Control Strategy of Rare Earth Permanent Magnet Synchronous Motor
Authors: Liu Xichen 
Published: March 2022

Abstract
Rare earth permanent magnet materials and magnetic composites help permanent magnet synchronous motor well developed. And it also has the advantages of small rotor inertia, high efficiency, high power density and high reliability. It has a good application prospect in high-performance servo system. This paper discusses the control strategy of permanent magnet synchronous motor.
Experimental Study on Electric Harvesting of Combine Harvester
Authors: Yang Zhengtao , Wang Haili , Sun Han , Wang Pengfei , Cao Qixin 
Published: March 2022

Abstract
The electrification and intelligent transformation of harvester to make it have independent operation ability is an important embodiment of the development trend of agricultural automation and intelligence. Based on a full feed combine provided by relative company, this paper makes an electric transformation for its reaping and threshing part, including mechanical design, electric circuit construction, brushless DC(Direct Current) motor installation and test. Based on the finite automatic state mechanism, the control system of the electric operation part is built. Its sequential start and stop functions, reel speed following function and blockage detection and discharge function are tested in no-load experiment and farmland harvesting experiment. Through the continuous wheat harvesting test for 30 minutes, the power characteristics when harvesting wheat are measured, and the stability of its work is verified.
Research on the Friction Pairs in Water Hydraulic Piston Pumps
Authors: Yang Yousheng , Yankey Richmond Polley , Li Hao 
Published: March 2022

Abstract
Power control hydraulics (PCH) has one of the most versatile research fields and technologies that has many applications especially in the mechatronic industries. It also comes with drawbacks especially with issues concerning the use of mineral oil as a pressurized fluid in most of it applications. Furthermore, in the mechatronic field, researches in the ocean environment has become more difficult due to mineral oil incompatibility with the ocean water. One of the most accepted solution is to find alternatives to mineral oil as a PCH pressurized fluid which has led to water being the safest candidate. As a result, more researches have been carried out on water as a pressurized fluid in PCH systems. Axial hydraulic piston pump has been one of the best pumps for PCH systems. It was realized in this paper that, more options for material selection for the friction pairs were available and therefore water hydraulics can realize its main goals of providing a safe environment as well as being cost-effective. This paper seeks to review the various material friction pair selection that has been suggested by various researchers in this field and analyze their various methodologies and experimentations.
Dynamic Analysis of Rudder Transmission Mechanism Considering Clearance Joint and Friction
Authors: Zhang Tao , Liu Geng , Ma Shangjun 
Published: March 2022

Abstract
Based on the theory of multi-body dynamics, this paper proposes typical impact model and friction model to research the dynamic characteristics of the transmission mechanism with clearance joints in ADAMS softwear environment; On this basis, considering the hinge gap and friction factors under the rigid condition of the mechanism, a multi-body model is developed. Dynamic simulation analysis has studied the influence of five hinge gaps and three friction coefficients on the speed and output displacement of the rudder transmission mechanism. The research results lay an important foundation for the further development of the rigid-flexible coupling and thermal-mechanical coupling dynamic characteristics of the rudder transmission mechanism base.
Design and Experiment Study on Three-dimensional Rotating Ultrasonic Composite Generating Electrolysis Machining
Authors: Cheng Wanwan , Li Jing , Ge Zhenghui , Zhu Yongwei 
Published: March 2022

Abstract
Proposed a multi-dimensional rotating ultrasonic composite electrochemical generating machining method. Designed and built the shaft and radial three-dimensional rotary ultrasonic composite electrolytic generating machining system, analyzed and studied the machining mechanism according to the interaction relationship between rotary ultrasonic, mechanical and electrolysis.Selecting and optimizing the machining parameters for to machine plane by grinding, ultrasonic and rotary ultrasonic composite electrolytic machining. By the tests, the machining system is stable and reliable, and the rotary ultrasonic composite electrolytic generative machining technology could effectively improve the machining efficiency and accuracy. Adding 3µm-5µm radial ultrasonic vibration, carried on the rotating ultrasonic generating machining the plane and cutting the grooves, the technical advantages of two-dimensional rotary ultrasonic composite electrochemical machining are verified.
Angle Steel Tower Bolt Installation Detection Based on Simplified Attention Mechanism
Authors: Zhang Jinfeng , Zhang Tianzhong , Lou Yihua 
Published: March 2022

Abstract
Incorporating position and channel attention into the image semantic segmentation network is an important strategy to improve the segmentation effect. However, there is a huge computational overhead in counting the correlation between any two positions or channels. To address the issue, this paper proposes a simplified attention mechanism network integrating position attention and channel attention. In addition, to further optimize the segmentation results, this paper adopts a new data-dependent upsampling method to expand the high-level feature map to the input size. Compared with the traditional attention network, our method reduces 32.6% of parameter and calculation amount, and obtains an average cross-comparison result of 95.42% on the dataset of angle steel tower bolt.
Realization of Parameterized Serialization Design of Flanges in Chemical Equipment
Authors: Liu Dongchen , Wang Junli , Zhang Yan 
Published: March 2022

Abstract
Flanges are important parts in the fields of machinery, chemicals, wind power, and sewage treatment. They are used in large quantities and have formed a series of products at present. In the paper, the secondary development of AutoCAD was adopted to parameterized series design, and 960 parts from 4 series flange (plate flat welding flange, neck flat welding flange, neck butt welding flange, socket welding flange) were drawn. The efficiency of part design has been significantly improved.
Research and Development of Electric Power Lifting Truck
Authors: Yao Zhao , Li Hejia , Zhou Liang 
Published: March 2022

Abstract
Equipment and materials are completely dependent on large machinery and human forklift, which is difficult to ensure the high efficiency of transportation. As a supplement to large transportation machinery and vehicles, it can make up for the lack of low transportation capacity of human-based transportation equipment, and solve the prominent problems such as backward material transportation equipment, poor road adaptability, time-consuming and laborious. The electric power assisted lifting truck to be developed can realize “one kilometer” of materials the transportation reserve with high travel efficiency has become the “range extender” of large vehicles. With the help of high and new technology, the R & D of electric power assisted lifting truck adopts the contractor guarantee mode to realize complementary advantages, resource sharing, joint development and win-win cooperation, so as to provide technical support for material support. The electric power assisted lifting truck is mainly composed of walking system, lifting system, control system and auxiliary system, which meets the needs of strong road trafficability, time-saving and labor-saving, simple operation, convenient maintenance, safety and reliability and low cost, and improves the rapid, accurate and convenient guarantee ability of materials.
Research on Design of the D-knotter Split Spindle
Authors: Guo Jiayu , Cen Haitang , Tang Hao , Shuang Zihan , Na Risu 
Published: March 2022

Abstract
The knotter is the core component of the square baler. The structure of the knotter is complex, the working load is large and the working environment is bad, which makes the knotter easily damaged. The imported D-knotter is widely used at present, once the parts are damaged, they often need to be disassembled and assembled as a whole, which takes a long time and seriously affects the efficiency of field operation. Aiming at the problem that the D-knotter assembly and its parts are inconvenient to replace after damage, this paper designs the split spindle of the knotter, and ensures the strength requirements of the spindle when working through an integral key connection. When replacing the knotter parts, the spindle is separated from the middle, and the knotter assembly is directly removed without removing other parts on the spindle, which obviously saves the replacement time of the damaged parts of the knotter. The statics and modal analysis show that the split spindle of the knotter can meet the strength requirements, and the spindle does not produce resonance.
Structural Design and Analysis of Part of Manipulator
Authors: Ma Yan , Jiang Xingqiao , Xu Jingxi , Liu Huang , Yuan Yue 
Published: March 2022

Abstract
In this paper, the manipulator can carry and grasp objects as the research object, manipulator is mainly composed of hands and motion mechanism. The adsorption type hand is mainly composed of suction cups and so on. The design object has three degrees of freedom, through the stepper motor and ball screw to complete the telescopic arm, through the cylinder to complete the lifting of the adsorption part, the workpiece from one coordinate adsorption and transport to another coordinate. Air suction hand structure design, hand calculation, cylinder control loop, cylinder working pressure, cylinder gas consumption analysisis presented.
Research on Fuzzy Control Algorithm of Self-walking Platform for Maintenance of Circular Tunnel
Authors: Liu Hao , Zhang Wen , Wu Zhenglong , Guo Tieying , Luo Dan , Peng Weiping , Zhang Tao 
Published: March 2022

Abstract
Self-walking platform is used to support subway tunnel maintenance and construction. However, the kinematics model and motion control of the subway tunnel self-propelled platform are different from that of the plane, it is a non-holonomic constrained system with serious sliding, strong coupling and highly nonlinear, and the pipeline environment is complex, so it is difficult to accurately model. In order to solve these differences, the kinematic characteristics of wheels in cylindrical workspace are discussed first. The geometric constraints of self-walking platform in circular tunnels are also analyzed. Secondly, considering the complexities of self-walking platform motion model, a control algorithm based on fuzzy logic is proposed. Finally, through MATLAB and ADAMS joint simulation, the scenarios for virtual platform moving in circular tunnels are simulated, which shows the effectiveness of the algorithm.
An Adaptive Threshold Selected Method from Remote Sensing Image based on Water Index
Authors: Qi Yanan , Dou Hongtao , Wang Zhaoming 
Published: March 2022

Abstract
Water is one of the most common and important objects on the earth, and its extraction is of great significance to many related researches in remote sensing domain. Water index method is most commonly used, and the accuracy of image interpretation is an unavoidable problem. However, traditional interpretation methods are subjective, and the efficiency of interpretation is relatively low. An adaptive threshold selected method based on modified normalized difference water index (MNDWI) is proposed here to extract water completely and accurately from remote sensing image. First, the study compares the effect of three commonly used water index methods (NDWI, MNDWI and MBWI) to extract water in Baiyangdian watershed, the result shows that MNDWI is better in separating water from background; then, a probability index method integrated water Z-score (IWZ) is used to segment MNDWI results. It shows that the optimized result with IWZ is more accurate than the traditional result with 0 as the dividing point, the former is 5% higher accuracy than the latter.
Research on Identification and Calculation Method of Moment of Inertia of Virtual Synchronous Generator
Authors: Guo Fusheng , Lv Zhiyuan , Bai Hao , Liu Dapeng , Wang Yongqing , Li Weichao 
Published: March 2022

Abstract
Because wind power itself does not have the ability to automatically adjust the frequency, the current continuous increase in the proportion of wind power in the grid makes it difficult for the frequency stability of the system to meet operating requirements. VSG control is to introduce the mathematical model of the synchronous generator into the control strategy of the inverter to make the inverter show the characteristics of the synchronous generator. As a control strategy of the inverter, Virtual Synchronous Generator (VSG) has flexible and adjustable control parameters. Features. This paper first analyze the current equivalent inertia calculation method. Based on the above-mentioned equivalent moment of inertia research method, a new improved equivalent inertia calculation method is proposed. The improved method further reduces the error on the base of the original method. At the same time, the amount of calculation is greatly reduced, which is of great significance to the stable calculation of the power system.
Numerical study of the effect of Inlet paired Swirl on Performance and Stability of Axial compressor
Authors: Cai Beijing , Liu Kaili , Yang Liu , Yang Xinyu , Guan Jian 
Published: March 2022

Abstract
In order to study the effect of inlet paired swirl distortion on the performance and stability of compressor, a full-annulus unsteady numerical simulation of the effects of swirl distortion on performance and stability of transonic rotor Rotor 37 is carried out in this paper. The result shows that: the rotor performance deteriorates and the stable working range decreases under the effect of vortex flow distortion; the circumferential side flow caused by vortex swirl distortion leads to the uneven circumferential distribution of flow parameters at the inlet and the outlet of the compressor; the rotor blade has a very significant attenuation effect on the swirl distortion, and the swirl distortion intensity decreases along the axial direction; the circumferentially inhomogeneous distribution of rotor angle causes excessive local aerodynamic load on the rotor, and high intensity leakage vortices and excitation vortices are generated at the blade tip. The circumferentially unevenly distributed swirl angle causes excessive local aerodynamic load of the rotor, resulting in high-intensity leakage vortex and shock wave interference in the blade tip area, which severely blocks the flow path and eventually leads to unstable flow in the Rotor37.
Optimization Study of Nacelle mounting position for Blended-Wing-Body Aircraft
Authors: Yang Liu , Liu Kaili , Zhong Yuan , Zhou Shirui , Cai Beijing , Yang Xinyu 
Published: March 2022

Abstract
Blended-wing-body aircraft is a new type of aircraft form that has been used in military aircraft. The potential for application in civil aircraft is being explored. Due to its special shape, the blended-wing-body aircraft is difficult to adopt the conventional under-wing engine mounting form, and usually applies the back braced mounting. The engine mounted on the back could cause surge and separation problems, which affects the flow field quality of the whole aircraft. In this paper, the effect of height and axial mounting position on the overall flow field of the aircraft is determined by modelling and calculation of the blended-wing-body aircraft. The effect of airflow separation is analysed. The engine axial mounting position is discovered to have a significant effect on the elimination of flow separation.