bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Installation Errors of Helical Gear on Bearing Capacity
Authors: Luan Heng , Shu Xiantao , Wang Jiabing
Published: October 2023

Broken tooth roots due to mounting errors in helical gears at high speeds and heavy loads are a common problem in steel mills. Based on the contact characteristics of helical gears, this paper uses the finite element method to simulate the bending stress at the root of the pinion gear and the contact stress at the tooth surface under two cases of different center distance error and axis parallelism error, analysis of the reasonable fluctuation range of the maximum principal stress and the maximum contact stress is obtained by fitting the relationship between these two stresses and the variation of the two errors, and then the bending and contact strengths are calibrated based on the simulation results. The study shows that the gears’ strength can meet the requirements when installed according to the grade seven gear transmission accuracy of the national standard of involute cylindrical gear accuracy, under the case of center distance error; under the case of the parallelism error, the inclination angle should be controlled within 0°3′2′′ to meet the minimum service safety factor conditions. The steel mills strictly control the above-mentioned installation accuracy when using helical gear drives, which can avoid gear tooth root breakage and improve the efficiency and reliability of gear drives.
Structure Design of Bionic Walking Chassis
Authors: Zhang Yiqing , Ma Yaoyu , Liu Ruijun , Ma Jingbo
Published: October 2023

As the land for UHV transmission lines slowly turns to mountainous areas, the operating environment for basic construction equipment will become very complex. The uneven ground and steep slopes are problems that machines often need to overcome. The existing traditional crawler type and wheel type construction machines and tools on the market can no longer adapt to this situation. Improving the mountain operation capacity of existing construction equipment is an urgent problem to be solved at present. In view of this, this paper designs a bionic walking chassis, describes its composition and structure, and proposes a hydraulic and electrical control scheme. Compared with the existing walking chassis, the bionic walking chassis has significant advantages such as good stability, high flexibility, strong climbing ability, etc. By using the bionic walking chassis in construction equipment, road construction can be greatly reduced, project cost can be reduced, and huge social, economic and environmental benefits can be brought, and it is of great significance to improve the national grid construction level.
Design of Hydraulic System for Pelton Turbine Governor
Authors: Xie Jiabin , He Lingyan , Yan Xinting , Ji Rui , Chen Bingsen , Li Jianfa
Published: October 2023

Bucket turbine is a device widely used in the development of high head and small flow hydraulic energy, which converts hydraulic energy into mechanical energy. The mechanical energy output by the water turbine is converted into electrical energy through a generator and then transmitted to the user end through the power grid for use. In order to ensure the quality of electrical energy and the controllability of energy conversion, bucket type water turbines need to be equipped with corresponding regulation and control mechanisms to achieve regulation and control during normal operation of the turbine and emergency shutdown of the turbine in case of accidents, while ensuring the safety of the hydropower station and unit. According to the requirements of hydraulic turbine regulation and control, a hydraulic control system scheme for the bucket type hydraulic turbine governor was designed, including the nozzle and deflector hydraulic control system, and the governor pressure oil station system scheme. The functions of various components of the hydraulic system and the regulation and control action process were analyzed in detail. The results have been applied in a high head hydropower station in Guangxi, China, with excellent performance and good results.
Analysis of Dynamic Response Characteristics of Sliding Overhead Hydraulic Support Under Variable Load
Authors: Qin Jianli , Jin Xin , Zhang Xiaowei , Cao Lianmin
Published: October 2023

Based on the situation that the hinge joint of the top beam of the sliding overhead hydraulic bracket is prone to damage by dynamic variable load, the response characteristics of the hinge joint when the top beam is subjected to variable load at different positions are studied to improve the reliability of the hydraulic bracket, and the numerical simulation model of the bracket is established using multi-body dynamics analysis software for analysis. The response coefficients of each hinge point are analyzed when the simple harmonic load is applied to different positions of the top beam. The findings indicate that when the simple harmonic dynamic load is positioned in the forward section of the front roof beam, the column exhibits a relatively significant mechanical steady-state response force and a heightened sensitivity to the dynamic load. Moreover, as the simple harmonic load exceeds a certain threshold, the pin at the hinge of the hydraulic bracket experiences greater susceptibility to damage. These observations offer valuable insights for the stability control and structural strength design of the bracket.
Research on Machine Tool and Process Planning for Composite Processing of Additive and Subtractive Materials
Authors: Cao Xuyan
Published: October 2023

The additive-subtractive hybrid machining can realize almost all the processes of additive and subtracting at one time, reduce the clamping error caused by changing, and greatly improve the processing quality and efficiency. Aiming at the problems existing in the processing of complex parts, this paper designs a micro composite processing machine tool for adding and subtracting materials, and takes complex impeller parts as an example to carry out the process planning of composite processing for adding and subtracting materials. The tool path planning of additive and subtracting machining was designed based on NX software. Finally, the virtual simulation machining system of the machine tool was built through VERICUT platform, and the simulation machining of the impeller parts was carried out to verify the rationality of the machine structure, the composite processing technology of additive and subtracting materials and the correctness of the NC program. The results show that this method can provide a new idea and reference for high efficiency and quality machining of complex parts.
Screw Theory Kinematics Modeling and Workspace Analysis Base on Offshore Gangway
Authors: Sun Wanqi , Li Chenxu , Chen Haiquan , Wang Shenghai
Published: October 2023

This paper carries out research on the offshore gangway, and introduces the spinor theory method which is simpler to calculate and more comprehensive to describe than the D-H parameter method. Referring to the modeling method of the series manipulator, the exponential product formula is applied to the kinematic analysis of the offshore gangway and the forward kinematic equation is established. The work space of the bridge was obtained by Monte Carlo method, and the 3D point cloud map of the gangway work space was drawn by MATLAB. The whole process shows the superiority and simplicity of spinor theory compared with D-H parameter method in inverse kinematics analysis and provides a new idea for similar kinematics and even dynamics analysis. Taking the RRP structure of telescopic gangway of offshore gangway as an example, the kinematics model based on screw exponential product equation is explained by Lie group knowledge and screw theory, the forward kinematics problem is analyzed, and a complete identification method with geometric significance is provided.
Discussion on Anti-Loosening Method of Commonly Used Fasteners in Coal Mining Machinery
Authors: Hu Yong
Published: October 2023

By understanding the development level of anti-loosening technology of threaded connectors at all companies from home and abroad, we studied the problem of loosening of threaded fasteners caused by the harsh working environment and strong vibration during the use of coal mine machinery and equipment, resulting in mechanical equipment failures Even hazards such as casualties. Through analysis and research on the basic principles of fastener loosening, we tried to find out the root cause of fastener loosening, through practice accumulation and application, research and discuss several commonly used fastener loosening methods, and by comparing and analyzing the advantages and disadvantages of many different anti-loosening methods, a solution is provided for solving the loosening of threaded fasteners of coal mine machinery and equipment. This method is not only applicable to coal mine machinery and equipment, but also provides a reference for solving the loosening problem of threaded fasteners of non-coal machinery and equipment.
Design of Freight Ropeway Feeding System for Long Steel Member of Tower Transportation in Complex Terrain
Authors: Huang Yongzhong , Li Lianmao , Wang Fei , Liu Chen , Qin Jian
Published: October 2023

For transmission lines in complex terrain transportation of large tower material with a single piece of large weight, length characteristics, research for long tower material transportation of new freight ropeway feeding system. Feeding system mainly by the feeding guide rail, rotatable material support railcar and power device, through the power device drive rotatable material support moving railcar in the feeding guide rail movement. Wherein the active rail car moves along the straight guide rail while driving the driven rail car along the curved guide rail by means of the long tower material on the rotating pallet According to the feeding guide rail trajectory, the material is transported from the stacking point to the loading point of the ropeway or from the lowering point of the ropeway to the construction point. The basic parameters of hydraulic cylinders and motors are derived through theoretical calculations, and the selection of hydraulic cylinders and motors is made conservatively by combining the actual situation, relevant standards, and parameters of existing products. The application of the feeding system solves the problem of transporting large materials in complex terrain, reduces the intensity of manual material handling and increases the mechanisation of the feeding process.
Fault Analysis and Form Discussion on Common Coupling of Coal Mining Machinery and Equipment
Authors: Du Jialin
Published: October 2023

By analyzing the possible faults such as wear, tooth breakage and deformation caused by couplings used in coal mine machinery and equipment, combined with practical application experience, the paper analyzes that the basic reason of causing coupling damage is the transient impact caused by overloading and design defects. In order to protect mechanical equipment from damage or shutdown caused by coupling failure such as overload and deformation, the advantages and disadvantages of rigid coupling, flexible coupling and safety coupling are compared, the author analyzes several kinds of couplings commonly used in coal mine machinery equipment, as well as the practical application occasions of various couplings, including the factors to be considered in the process of design and selection, etc., this paper provides a reference for the selection and design of couplings of coal mine machinery, and also provides ideas for the selection and design of couplings of non-coal mining machinery and other practical applications.
Research on Assisting Control and Oxygen Metabolism Testing of Rope Driven Flexible Exoskeleton
Authors: Song Dingan , Hu Jing , Li Yangyang
Published: October 2023

In order to improve the human-machine collaborative comfort and assistance comfort of rope driven flexible assisted exoskeleton robots, research is conducted on the assistance control design and assistance performance of rope driven flexible assisted exoskeleton robots. This article proposes the use of inertial measurement units (IMUs) for real-time detection of human motion posture information, and by extracting features from human motion posture information, a human motion gait switching model is used to identify the phase of the motion gait. Then, based on the gait phase recognition structure, plan the timing and duration of assistance for the exoskeleton. Then, based on the transfer efficiency model of the load on the human skeleton, the assistance size of the exoskeleton is determined, and a force position hybrid control method is used to assist in controlling human motion, obtaining control commands. Finally, the assistance performance of the exoskeleton was verified through the evaluation of human exercise net oxygen uptake metabolism test. The experimental results show that under the conditions of a slope of 5°, a walking speed of 5km/h, and an external load of 25kg, the rope driven flexible assisted exoskeleton robot can reduce the net oxygen uptake metabolism of human movement by a maximum of 10.28%, a minimum of about 2.2%, and an average reduction of about 6.23%. The results demonstrate that rope driven flexible assisted exoskeleton robots have significant assistance effects on human motion.
Design of a Circular Micro-Particle Filtration Device
Authors: Huang Zhiwei , Yan Lijing , Zhang Tong
Published: October 2023

Particles in a non-uniform electric field solution are subjected to dielectrophoresis, and the trajectory of particle movement is altered. This study is based on the principle of dielectrophoresis to design a device for the filtration of micro-particles of two different sizes that are in an AC electric field solution. Firstly, the two-dimensional plane structure of the filtration device is designed, and the filtration device model with coupled multi-physics fields is established by using the finite element analysis method. The electrode voltage magnitude, inlet flow rate, particle size, and particle conductivity in the model were analyzed and discussed to summarize the influencing factors that affect the filtration effect of micro-particles. The higher the electrode voltage of the filtration device, the greater the change in the trajectory of particle movement occurs, and it is difficult to achieve particle filtration when the electrode voltage is less than 5v. When the inlet flow rate increases the electrode voltage needs to be increased to achieve filtration of microparticles. When the flow rate of the filtration reaches 3000μm/s, it is difficult to filtration even when the voltage increases to 10V, so the suitable maximum flow rate of this device is 2000μm/s. The factors affecting particle manipulation are adjusted to improve the filtration effect of micro-particles, and this filtration device can filtration out larger size particles and leave smaller size particles.
Study on SVG Control Method Based on Reactive Open Loop
Authors: Xu Minmin , Jie Yibing , Yang Weiwei , Liu Chaonan , Rong Xiao , Wang Jinliang , Zhou Boxi
Published: October 2023

Aiming at the series of problems of power quality such as low power factor, large reactive power deficiency and the presence of harmonic interference leading to high harmonic content, which are caused by non-linear load in the system, a reactive power open loop control strategy is proposed in this paper. This control strategy improves the conventional indirect current control method, and uses the voltage outer loop of reactive power control to control the power factor parameter. The basic method is as follows: the reactive current of the system is controlled by a series of controls after comparison of a given ideal power factor with the actual power factor. Finally, the involved system is simulated and modeled by PSCAD tool. The simulation results show that, with this improved control strategy, the SVG can compensate the reactive power of the system through accurately responding to the dynamic changes of reactive power in the system.
Chip Architecture Design Management Based on Low-Power Multitasking Simulation
Authors: Zhang Ying , Sun Kai
Published: October 2023

From the aspects of low-power DSP design, low-power SOC design, and low-power power switch design, this paper proposes a chip architecture “high-low matching” scheme for low-power multitasking requirements. The low-power DSP design starts with operating voltage and operating frequency control, and uses three low-power modes, PD1, PD2, and PD3; the low-power SOC design carries out low-power mode management from the clock control of APB and AHB bus; In terms of low-power power switch design, no-load low-power control, and input under-voltage protection, output over-voltage protection, over-temperature protection, and output over-current protection are implemented. The paper proposes different low-power control modes. After the evaluation of the built test platform, it is proved that the design of the scheme is reasonable, and it can realize the engineering application of low-power multi-task management.
Research on the Distribution and Development Law of Cable Channel External Damage Disease
Authors: Xiong Gang , Li Kunsheng , Shi Zengli , Zhu Junyong , Huang Huixian , Wu Chen
Published: October 2023

With the increase of the scale, the accidents that the cable channel is broken by the adjacent construction equipment often occur, which will not only affect the normal operation and maintenance of the internal cable, but also may cause fire, power failure and other accidents. Therefore, it is very important to study the distribution law of the external damage disease of the cable channel structure, the influence of the external damage disease on the structure and the development law. Based on the structural damage of 255 cable channels in China, this paper studies the correlation between structural damage and cable channel type, construction method and structural type, and obtains the distribution law of main structural damage of cable channels such as cracks, water leakage, displacement / deformation, siltation and structural damage. Secondly, the model of the real cable channel with external crack damage is constructed by FLAC3D numerical analysis software, and the influence of different size cracks on the bearing capacity of the real cable channel structure with crack damage and the development law of external crack disease are studied.
Design of an Automated Handling Robot System Based on Autonomous Driving Technology
Authors: Fan Xiaotian , Tu Anjie , Zhang Hongrui , Chen Xiai , Zeng Tao
Published: October 2023

An Ackerman mobile robot based on the open-source Robot Operating System (ROS) was developed in this research, which can be controlled by the self-designed upper computer and achieve automated handling in specific situations. The robot can use the gmapping algorithm to build a map, use LIDAR and IMU sensors to obtain information about the external environment, and locate the position and attitude of itself in real-time. When the robot receives the target point sent by the upper computer, The robot will autonomously path plan and avoid surrounding obstacles according to the target point sent by the upper computer and the external environment, complete the required tasks through deep learning, and reach the known target point. And, this paper makes improvements to the pure pursuit algorithm in the path tracking method for self-driving car. For the traditional pure pursuit algorithm, the tracking accuracy is limited by the look-ahead distance and the inability to achieve a good tracking effect, this paper proposes the dynamic look-ahead distance selection and the improved pure pursuit algorithm.
Analysis of Typical Galloping Shandong 500kV Wendeng Line in 2021
Authors: He Yongjun , Zhang Bin , Chen Li , Zhao Bin , Shi Changye , Sun Guolei , Wu Yunliang
Published: October 2023

In November 2021, 500kV Wendeng pumped storage infrastructure projects in Shandong were affected by extreme bad weather, continuously galloping occurred on key devices, which resulted in damaging to some conductors and fittings and equipment, and brought large losses to the construction of Shandong power grid. To understand and prevent similar galloping disasters, the main amplitude and frequency characteristics of galloping were clarified by analyzing the topography around, the line’s design parameters and the observation data on site. Then by reviewing the local weather process, clear the weather process of temperature, precipitation, wind direction and other elements before and after the occurrence of galloping, and combined with applied mechanics modelling and analysis, to clarify the quantitative inducing factors of galloping, proposed for galloping characteristics of the analysis of applied mechanics methods for the infrastructure line, provided a theoretical basis and technical support to prevent galloping for the subsequent transmission line infrastructure projects in the power grid in Shandong as well as in China.
A Live-Line Emergency Power Restoration Robot for 10kV Overhead Distribution Networks
Authors: Zhou Jian , Xu Peng , Luo Sha , Xiao Rong , Huang Zhijian , Mo Jianbo
Published: October 2023

This study proposed a socially beneficial live-line power restoration robot to assist with the provision of back-up power to the 10kV overhead network. By using the winch, the robot can automatically climb up and down the Overhead power line without the cooperation of the insulated bucket truck. The operator only needs to control a remote on the ground instead of ascending the power tower. The robot performs multiple wire stripping by fine-tuning the feed amount, and cooperates with sensors to automatically detect the insulation layer stripping effect, achieving spiral stripping of the insulation layer of the distribution wire and connecting it to the emergency power supply. It is prominent in situations where emergency power generation vehicles are unable to reach the target operating position in time. Moreover, this robot is a user-friendly control with no terrain restrictions, allowing rapid power restoration to the distribution network and completely replacing traditional manual tower climbing operations.
Design and Analysis of a Continuous-Double-Cable Freight Ropeway
Authors: Qin Jian , Liu Chen , Qiao Liang , Wang Fei , Nie Qiong , Xu Jin
Published: October 2023

Aiming at the transport requirements and structural characteristics of double-bearing cable freight ropeway, a pulley type continuous-double-cable freight ropeway is proposed on the basis of the common double load-bearing cable freight ropeway. One wire rope forms two load-bearing cables through the automatic balance device of cable tension. The length of load-bearing cables can be adjusted according to the tension difference of cables during operation process of ropeway. In addition, the roller-type saddle for double-cable freight ropeway is designed to improve the adjustment ability of load-bearing cable. It ensures consistent sag between the load-bearing cables during transportation and avoids overturning of the running car. The calculation of ropeway structure is done according to the actual topography condition, and the loads of the main load-bearing components of the continuous double-cable freight ropeway, such as the automatic balance device of the cable tension, the roller-type saddle and the support leg ropeway, are obtained. The finite element analysis also is carried out on the basis of the loads of ropeway structure. The results show that the components of ropeway meet the structural strength requirement. The continuous-double-cable ropeway can maintain the tension equilibrium of the load-bearing cables, effectively reduce the difficulty of sag adjustment, and improve security in construction.
Research on Solenoid Valve Fault Diagnosis Algorithm Based on Coil Current
Authors: Li He , Tang Yuanyuan , Liang Wenwein , Jiang Yuchi , Zhang Yi
Published: October 2023

Ship intelligence is the trend of future ship development, and engine room intelligence is a key research direction. In the future, manual valves in ship engine rooms will inevitably be increasingly switched to automatic control. To solve the problems of traditional ship equipment controllers without feedback, inability to know the actual action of the solenoid valve, and inability to diagnose common faults when controlling the solenoid valve with switch values. A detailed analysis was conducted on the mechanism of the formation of the theoretical current characteristic curve for the opening and closing of the solenoid valve coil. Based on the actual use of the solenoid valve in the ship’s engine room, the current characteristic curve of the coil was studied for different temperatures, installation directions, valve core sticking at different positions, short circuits or open circuits. Corresponding fault diagnosis algorithms were designed based on the current characteristic curve. After testing, the solenoid valve drive fault diagnosis algorithm designed in this article can achieve 100% accuracy when the solenoid valve model is determined. Its short circuit fault diagnosis only takes 1.43ms, which is much less than the fusing time of the self-recovery fuse 200ms. It can disconnect the power supply in advance and effectively protect the circuit and equipment.
Design of Wheelset Clamp Type Insulation Coating Mechanism for Bare Wire
Authors: Sun Zheng , Zhu Junpeng , Xie Rui , Zhou Yu , Wu Wangping , Xu Kuo
Published: October 2023

The insulation coating of bare wires is an important measure to ensure the safety and reliability of power transmission. The design of the coating mechanism for bare wire insulation coating robots is the key to intelligent coating. This article proposes a new type of wheel group clamping coating mechanism suitable for multiple types of bare wires. It has a conventional sag adaptive design, which can stably walk on the wire, achieve uniform coating, and meet the requirements of different coating thicknesses by adjusting the movement speed. Through mechanical analysis, software simulation, and experimental verification, it is shown that the vibration of the front and rear wheels during operation is not uniform, forming the pitching motion of the entire mechanism. The speed fluctuation remains at around 70mm/s, with a fluctuation rate of about 23%. After 0.2 seconds of coating startup, the operating speed of the nozzle and the output torque of the driving wheel tend to stabilize, proving that the mechanism has characteristics such as stable performance and smooth walking, It provides a new solution for the insulation coating of bare wires and has important application value.
Battery Management System for Cell Balancing in an Electric Vehicle
Authors: Kumar Pulkit , Gill Amandeep , Johar Arun Kishor
Published: October 2023

Batteries are becoming more and more popular for use in homes and cars, which uses because of their high efficiency, minimal self-discharge, and high volumetric and gravimetric energy densities. However, because they can carry a lot of energy, Failure to confirm that they are functioning within their allowed safe operating limitations could result in fire dangers and explosions because they tend to be more unstable than other power sources, such as lead-acid batteries. To maintain battery packs within safe operating parameters & optimum power usage, innovative Battery Management Systems (BMS) are required, hence avoiding endangering users. This inquiry starts with a battery model employing passive components before addressing the crucial components of developing a successful BMS. Additionally, it offers simulation to make a BMS’s operation easier to understand.
Simulation of Car Body Deformation in Electrophoresis Process Based on Fluid-Structure Interaction Method
Authors: Yu Baojun , Li Ding , Xu Anyang , Huang Yongjian , Li Haidong
Published: October 2023

During the car body painting process, the car body is prone to deformation after being subjected to shock loads from electrophoresis fluid. The traditional solution is to adopt multiple rounds of test testing to verify the feasibility of the scheme and conduct an optimization plan attempt, undoubtedly requires a long period of time and a large amount of human and material resources. The multi-phase flow simulation method and overlapping mesh technology are used to simulate car body electrophoresis process, extract the electrophoresis shock load of the body, simulate the deformation of the body through the simulation method, and optimize the overall structure through the topology simulation method to reduce the deformation during the electrophoresis process. The simulation method is in good agreement with the test results, and can be used to simulate, predict and optimize the deformation of car body structure during the electrophoresis process in the product design and development stage.
Research on the Motion Mechanism of Polishing Machine Based on Joint Simulation
Authors: Zhang Mingsong , Cai Zhenyu , Xiao Jinzhi
Published: October 2023

This paper for the mathematical modeling mechanism of the polishing machine, first based on the mechanical characteristics of the plate, analysis of the adhesive contact force and driving force, establish the polishing machine in the straight line, arc motion of kinematics and dynamic model, deduce the movement under the polishing machine movement speed, angular speed, position and driving friction force, driving moment. Finally, through joint simulation and verification by Admas and Simulink. The conclusion is that as the inclination of the wipe disc increases, the saturation speed of the linear motion will increase with a constant tolerance speed, the saturation angular velocity of the rotation motion also increases uniformly with the tolerance angular velocity. The rotational radius of the arc motion increases uniformly with the tolerance radius, and in the two sides of the disc inclination value in the opposite direction. On the contrary, the value decreases to the same value of the same direction and turns to the rotation movement. With the decrease of the disc rotation speed, the saturation velocity and saturation angular velocity of the line and rotation motion, the linear velocity and rotation radius of the arc motion are all decreasing, the angular velocity is increasing. This paper provides the theoretical basis for the steady state control of motion pose, and provides important reference for system parameter design and field construction of disc machine.
Study of the Influence of Rotor Shape on the Aerodynamic Characteristics of Flettner Rotor
Authors: Huang Lianzhong , Song Qiushi , Zhang Rui , Wang Kai , Ma Ranqi
Published: October 2023

The research and application of sail-assisted ships are of great significance for promoting the green development of shipping industry. The optimization design of sails is crucial for improving the efficiency of wind energy utilization. This study investigates the effect of rotor shape on the aerodynamic characteristics of the Flettner rotor by using the computational fluid dynamics (CFD) method. New geometric model of the multi-circular arc Flettner rotor using SolidWorks software, followed by meshing and setting boundary conditions, is established. On this basis, the aerodynamic characteristics of different shapes of Flettner rotor are analyzed. The study results show that the lift and drag coefficients increase as the velocity ratio increases, and the closer the rotor shape is to a circle at a certain velocity ratio, the larger the lift coefficient is. In addition, the lift coefficient of the multi-arc Flettner rotor is close to that of the circular Flettner rotor at high wind speeds. The study can provide some guidance for improving the aerodynamic performance of the Flettner rotor.
Numerical and Experimental Study on AA5052-O Pipe Joining Components Fabricated by Inner Swaging
Authors: Yang Jingchao , Guo Wei , Cai Yang , Yang Pingchuan , Men Xiangnan , Duan XiaoYan , Li Guangjun , Li Heng
Published: October 2023

The reliable joining between two pipes is an important precondition and safe guarantee for the aviation pipeline system. In this paper, the inner swaging process is used to fabricate the aluminum alloy pipe joining components with large diameter and thin-walled structure to achieve the reliable connection of aviation pipes. The material of the joined pipe is AA5052-O, and the specification of the pipe is Φ75×t1.5 mm. The mechanical properties of the pipe were characterized for material modeling by the tension tests of arc-shaped sample cutting from the full-sized pipe. The whole model for the inner swaging process was simplified by fitting the cooperative motion of the mandrel, rollers, and cage into the independent motion of the rollers. Based on the above modeling process, the finite element model for the AA5052-O pipe forming process by inner swaging was established, and the accuracy of this model was verified by the comparison between the simulation and test results on the longitudinal section. Based on the numerical simulation results, the pipe filling into the grooves and deformation features were analyzed, and the forming process parameters were obtained. Finally, it is concluded that the qualified filling rate of the pipe into the grooves of the sleeve can obtain the reliable joining.
A Static Beamforming Method for Neural Networks with Continuous Spatial Coverage
Authors: Yang Xiaohui , Jiang Jingfei , Liu Jiang , Li Yunhao
Published: October 2023

The static beamforming algorithm obtains the beam response of the corresponding angle lattice within the range of scanning angles of interest by traversing different angles, resulting in the problem of discontinuous coverage in the spatial domain [1]. And the denser the airspace, the greater the beam storage resources required by the system. In response to the problem of large pointing angle estimation errors caused by discontinuous spatial coverage in traditional static digital beamforming algorithms, a beamforming algorithm based on RBF neural network is proposed. By utilizing the good generalization characteristics and nonlinear approximation ability of RBF neural network, the corresponding relationship between the array heading vector and beamforming weight is established to fit data on non lattice points, thus achieving continuous spatial coverage of static beamforming [2]-[3]. At the same time, after a large amount of precise network training, the use of neural networks can quickly obtain beamforming results in the same application scenario. Through theoretical analysis of the principle and ergodicity advantages of static beamforming algorithm based on RBF neural network, a simulation model was established, and the beamforming results of this algorithm were compared with traditional static beamforming methods. The simulation results show that the proposed static beamforming method based on RBF neural network has accurate beamforming ability and good robustness to amplitude and phase errors. The trained neural network can quickly obtain beamforming results. It has high practical application value.
Optimization and Investigation of Anti-Whiplash Test of Automotive Seats Based on Virtual Simulation
Authors: Zhang Yu , Si Tingting , Huang Wenjiao , Xie Jun
Published: October 2023

The improvement of social economy has promoted the vigorous development of the automobile industry, more and more people have their own special vehicles-cars, and put forward higher requirements for the appearance, comfort and safety of cars. In traffic accidents, rear-end collisions occur from time to time. Although the fatality rate is relatively low, it is easy to cause neck injuries to the occupants. Therefore, besides driver seat whipping (Whiplash), the second row seat whipping test is introduced into the system for the first time in the 2021 version of C-NCAP evaluation system. For the seat, according to the test results of the 2021 edition C-NCAP evaluation system, the finite element whipping alignment CAE model of the second row independent seat of a passenger car is established, and the calculation results of the whipping simulation model are obtained, in which the poor NIC, Upper Fz and Upper My are close to the test results. At the same time, the seat improvement scheme is proposed for the deduction items NIC, Upper Fz and Upper My, and the simulation verification of the improved second row seats is carried out. The results show that the Upper Fz can be improved by optimizing the effective height of the headrest, and the NIC and Upper My can be effectively improved by improving the frame stiffness of the headrest area. The final simulation results meet the requirements of the second row seat whipping score of the car, and provide theoretical and experimental basis for the optimization analysis of the second row seat.
Integration of the AI and ML Approaches for Prediction Analysis in Welding: Review
Authors: Bassir David
Published: October 2023

Welding techniques are presents in almost all industries from automotive, aerospace, building, etc. Despite the fact that the technology behind welding remain simple, it is very complicated to characterize and predict the final mechanics responses without considering all the process of the welding. In particular when we refer to the fatigue as the main constraints are located at these singularities areas. Such challenges include poorly controlled welding parameters and weld geometry, which lead to weld quality problems. Nowadays, with the recent involvement of Artificial intelligence (AI) and Machine Learning (ML) into the industry 4.0, it was just matter of time before it is applied to welding problems. The potential applications of ML and AI in welding are vast, as it should bring more efficient and streamlined compared to what is used to be in the early 90’s. In this review a focus will be done on the recent advanced, and reviews previous investigation on AI applications in welding process control and welding robot control. Quality control of such welds are important when we deal with mass production of sensitive products. The main challenges remain the data acquisition to increase the efficiency of the prediction. Testing are sometime coupled with finite elements simulation for training and testing the ML Perspectives and future challenges regarding the integration and the impact of AI in the welding industry in the era of Industry 4.0.
Research on High Dynamic and High-Precision Attitude Position Measurement Technology for Aircraft
Authors: Huang Gang , Xie Jiang , Gao Zhiyuan
Published: October 2023

The fighter’s positioning module is out of work when the aircraft speed was greater than Mach 1.5, and the satellite signal was blocked during high maneuvering. The airborne location collector is unable to locate. Aiming at the problem that the GNSS receiver can’t be located under high dynamic conditions, and the flight test tasks such as aerial refueling, weapon target test, and ship adaptation require highly for the attitude and position measurement accuracy and data update rate. But the accuracy and update rate of current measurement methods are low. It does not meet the test requirements of flight test missions. Therefore, the combined measurement technology based on the MEMS IMU + GNSS is researched. The network RTK is used to improve the accuracy of GNSS data measurement by an order of magnitude. Besides, GNSS data is used to modify the IMU solution data to achieve high dynamic and high-precision measurement for aircraft attitude.
Research on the Progress of Mechanized Harvesting Technologies for Garlic Mosses in China
Authors: Yang Jang , Zhang Shaoqiang , Ma Zhaoyi , Feng Yanwei
Published: October 2023

Nowadays, garlic moss harvesting in China is still by means of manual operation, and it is lack of mechanization. In order to develop garlic moss harvesters suitable for the needs, the study analyzes the garlic moss mechanized harvesting technology based on the current situation and characteristics of garlic moss harvesting, summarizes the research status and characteristics from four aspects including devices of pricking, clamping, peeling, and bolting, and generalizes the existing problems and solutions restricting the mechanized garlic moss harvesting in China. The paper also points out that the standardization of regional planting, the formation of deep integration of agricultural machinery and agronomy, promoting the process of intelligent research and development, and increasing the investment in scientific research will be the development trend of mechanized garlic moss harvesting in China in the future. The study provides reference for the structural and innovative design of the new garlic moss harvester.
A Review of Research on Intelligent Engine Room Systems
Authors: Zhang Jiale , Jiang Jiawei , Zhang Sijie , Zhang Peng , Dong Junwei , Sun Ze
Published: October 2023

The application of intelligent engine room systems in the field of ship automation is becoming increasingly important. This review focuses on the research of engine room fault diagnosis in ships, proposes the technical system of intelligent engine room systems, and discusses the research content of engine room condition monitoring technology and fault diagnosis technology. The paper points out that industrial intelligence is one of the main directions of industrial technological development, and emphasizes the intelligent transformation in the design and manufacturing of intelligent ships. The paper further introduces the engine room as the core of a ship, and emphasizes the importance of its operational efficiency for overall performance. However, most of the current domestic ship engine room automation systems are closed and isolated, unable to upload engine room equipment data in real time, and cannot meet the requirements of ship classification societies. Therefore, fully sensing the status of engine room equipment and using big data analysis and intelligent diagnostic technology to improve engine room operational efficiency become the future development direction.
Research on Design of Pile Foundation Considering Superstructure Synergy
Authors: Xiao Qingfeng , Shen Lingshan , Peng Yingying , Huang Yi
Published: October 2023

In the urban construction of high-rise buildings, pile raft foundation is widely used nowadays. Based on the empirical formula of Chinese design codes and the related theory of computer finite element, this paper conducts a general study on the calculation of mono-pile bearing capacity of pile raft foundation, established a numerical model to calculate the interaction between pile raft foundation and superstructure, considering the internal force and settlement deformation of pile raft foundation under the superstructure load and shield tunnel construction steps. In order to ensure the stability of large structures under complex conditions, the ultimate vertical load-bearing capacity of individual piles is calculated at different locations under the superstructure foundation. Through the analysis of the settlement and internal force change curves of the pile foundation under the completed working conditions, the results show that the response of each index tended to be stable, verifying the reliability of the structure and the safety of the shield construction. simultaneously, for the empirical formula of bearing capacity calculation of pile raft slab foundation, the correction coefficient of large diameter size effect is proposed in the Chinese code, and this empirical parameter can provide reference for bearing capacity calculation of pile raft foundation in the preliminary design of this kind of project in the future.
Study on the Solution of LEM Method for Slope Based on Multi-Directional Seepage
Authors: Wang Yongbo , Shen Lingshan , Mon San Myat , Wan Dian , Ren Huimin
Published: October 2023

Slope is a common form of engineering in mining, water conservancy and highway, and with the development of engineering technology, it shows more and more the trend of high and steep geological situation complex. Generally speaking, the main causes of sliding instability of soil slopes are the increase of load on the top of the slope or building construction, the increase of saturation weight of soil due to rainfall, the hydrodynamic force caused by seepage and hydrostatic pressure in soil cracks, and the increase of effective stress within the soil due to the significant drop of groundwater level. Due to the influence of various external factors leading to the reduction of shear strength of the soil body, prompting the destabilization and damage of the soil body, in the construction of projects such as open pit mining and earth and rock dams are involved in the stability of the slope, this paper based on the classical circular sliding method for the existence of hydraulic gradient and slope angle inconsistent with the detailed calculation of the study, the study of the pore water pressure and seepage force action direction under different circumstances of the calculation of the safety factor, through The stress limit equilibrium method and the strength reduction method are used to verify the above theoretical derivation method in detail, and a modified Swedish strip division exact solution considering the seepage effect is concluded.
Research on Software Fault Feature Data Extraction Method for Software Fault Prediction Technology
Authors: Yan Ran , Wang Meichen , Xu Zhaowei , Zhang Kai
Published: October 2023

The correlation between software failure characteristics and software failure directly determines the predictive performance of the failure prediction model. The extraction of software fault features is crucial for building equipment software fault prediction models, and is an important process to ensure accurate prediction. However, the software fault feature data extraction method is often complicated to use and has no pertinence to the selected software fault feature data, and it takes a lot of time to complete the extraction steps. This paper summarizes software metrics and software defect types based on research at home and abroad, and selects software metrics and software defect types that are suitable for equipment software. Using regular expression technology and CSV technology research the automatic extraction way of software fault features, and finally constructs a fault data set that can be used for software fault prediction models.
Machine Learning Motor Vibration Monitoring System with a Service Estimation Date
Authors: Ibrahim Salman Yusuf , Ilyas M.A. , Li Qinlin , Ahamed Khan M.K.A. , Othman M.B.
Published: October 2023

This paper presents machine learning motor vibration with service estimation date. AI and machine learning algorithms are used to evaluate electric motor vibration patterns and predict maintenance and repair needs. Efficiency, downtime, and maintenance and repair schedule optimisation are project goals. Over time, machine learning algorithms analyse electric motor data to identify vibration patterns. This will predict maintenance and repair needs. KNN, CatBoost, and Neural Network were studied. Machine learning algorithms predicted maintenance and repair needs with over 90% accuracy. Algorithms also calculated the service estimation date, improving maintenance and repair scheduling. It improved maintenance and repair programmes, reduced downtime, and increased reliability. An ESP8266 and a vibration sensor to record and send electric motor data to ThingsSpeak, an IoT website that analyses it. Machine learning algorithms is then used to classify the motor vibration to determine the service estimation date. This project taught me how to maintain and repair electric motors using machine learning and AI algorithms.