bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on Autonomous Operation Motion Control of Excavator
Authors: Gong Mingde , Jin Zhong , Zhang Yue , Liu Wenbin , Ning Yue 
Published: June 2024

AbstractAccurate motion control is the premise for the unmanned excavator to complete the operation. In this paper, the motion control of a 22 t hydraulic excavator is studied. By establishing the dynamic model of the 4-degree-of-freedom excavator working device, the external interference caused by gravity, centripetal force, Coriolis force and inertia to the hydraulic cylinder is compensated. The bucket load and related parameters in the excavation process are identified online, and the motion control accuracy of the excavator is improved. Based on the dynamic model, the motion control method of the unmanned excavator is given. The simulation and experimental results show that this motion control strategy can effectively improve the autonomous operation accuracy of the excavator.
Analysis and Experiment Study About Vibration Compaction Based on Drucker-Prager Model
Authors: Ma Liying , Gui Macheng , Gui Shaoxiong , Cao Yuanwen 
Published: June 2024

AbstractThe relationship and the applicable conditions between Mohr–Coulomb model and linear Drucker-Prager model were discussed, and the results showed that when the friction angle was less than 22° Drucker-Prager model was more suitable for modelling the soil unit; When the friction angle was more than 22°, the Mohr–Coulomb model should be used. In order to further study the compaction characteristics of vibratory roller and the dynamic relationship between vibratory roller and soil, the finite element model of “vibrating roller-soil” was established. The simulation results showed that vertical stress of the soil distributed symmetrically along the axial direction of the vibrating drum, shift forward along the direction of the vibration drum, and decreased sharply with the increasement of the depth. Then experiments carried out showed that acceleration of the vibrating drum was positively correlated with the compaction times, which verified the model was basically correct. Moreover, the regression equation between the compaction degree and the effective value of acceleration was obtained, which provided the idea for the new compaction degree monitoring system.
Multi-mode Sliding Mode Control of Four-Cable Parallel Robot Based on Wind Disturbance Observation
Authors: Tong Shenghao , Zhao Long , Shi Huaitao , Duo Zhiqiang , He Cai 
Published: June 2024

AbstractAiming at the problem of accurate trajectory tracking of four-cable parallel robot under wind disturbance in the process of material handling in buildings, a multi-mode sliding mode control (MSMC) method based on wind disturbance observer is proposed. Firstly, the wind field model is established, and the comprehensive wind speed model is introduced into the accurate dynamic model as a wind disturbance factor. Secondly, the wind disturbance observer is introduced to estimate the total disturbance of wind disturbance error in real time, which effectively reduces the switching gain, thus effectively reducing the vibration and improving the control accuracy of the system. Combined with the dynamic performance of multimode sliding mode controller, it can be switched at will to reduce chattering. Compared with the traditional sliding mode control method SMC, the anti-interference ability of MSMC is verified. The results show that the designed multimode sliding mode controller can effectively suppress the influence of wind disturbance on the vibration of the end effector.
Development of CDC Shock Absorber Design Software
Authors: Liang Zhitao , Zhao Zhiwei , Yue Luyou , Yang Xinlong , Zhang Xinxing , Zhang Bing 
Published: June 2024

AbstractIn response to the low design efficiency caused by the numerous design parameters of existing shock absorbers, this research presents the design of an efficient software tool for obtaining the external characteristics of Continuous Damping Control (CDC) shock absorbers. Firstly, a mathematical model for the damping force of the shock absorber was established based on principles from fluid dynamics, elasticity mechanics, and throttle orifice models in the rebound and compression valve systems. Secondly, a Graphical User Interface (GUI) was developed to visualize the external characteristics and conduct simulation studies of the CDC shock absorber. Finally, experiments were performed on a shock absorber test bench to validate the external characteristics of the CDC shock absorber using initial structural parameters. The GUI software interface enables direct adjustment of the shock absorber's structural parameters and signal excitation, thereby enhancing the practical efficiency of the shock absorber. A comparison between simulation and experimental results reveals that the relative error rate is generally high when the velocity amplitude is 0.052m/s, with a maximum relative error rate of 24.44%. For other excitation velocity amplitudes, the relative error rate remains within 10%. This demonstrates the high accuracy and reliability of the established mathematical model for the CDC shock absorber, providing a solid theoretical foundation for studying the shock absorber's external characteristics.
Kalman Filter-based Vibration State Estimation and Optimal Control of a Special Vehicle
Authors: Zhang Bowen , Zhang Ming , Zhou Yunbo 
Published: June 2024

AbstractTake a certain type of special vehicle as the research object, establish the four-degree-of-freedom suspension vibration time-domain simulation model of the semi-vehicle, and use the Kalman filter algorithm for the vibration state of the vehicle in the driving process. By designing the Kalman observer of the linear suspension system, the state estimation of the vertical displacement and vertical acceleration of the front and rear suspensions and the body of the vehicle travelling on the uneven road surface is carried out, and the simulation analysis of the estimation effect is carried out, and the simulation results show that: the algorithm is able to estimate the relevant parameters of the vehicle vibration more accurately under the random road surface of E-level. Based on the state estimation value, a linear-quadratic optimal control method is adopted for the active control of suspension, which provides a basis for the design and optimal control of active suspension for subsequent special vehicles.
Analysis on the Precooler Outlet Compensation Pipe Rupture of Civil Aircraft
Authors: Du Nannan 
Published: June 2024

AbstractThis paper focused on the rupture problem of precooler outlet compensation pipe of civil aircraft, the design concerning was discussed. Based on the design proposal, aging mechanical from two aspects of temperature and high velocity sand dust flow were calculated and tested. Root cause of pipe rupture is identified and the result shows silicon rubber could not suffer high temperature up to 250 ℃ and velocity up to 150 m/s.
The Influence of Parameters and Load on the Spin Angle of Multilayer Strand Wire Rope
Authors: Wang Siqi , Cao Xuyang , Wang Dianlong , Xu Zhihe 
Published: June 2024

AbstractThe spin characteristics of multi-layer strand wire ropes can reduce the control accuracy of the crane lifting system, resulting in the crane being unable to meet the high-precision operation requirements. An object of this paper is to know about the influence of different parameters on the spin characteristics of multi-layer strand wire ropes. This article first theoretically analyzes the effects of wire rope twist angle, wire diameter, material, and load on the rotational characteristics of multi-layer strand wire ropes. In addition, we use CREO to establish a parameterized model for multi-layer strand wire ropes, and then set the material properties, contact parameters, and boundary conditions of the model in ABAQUS. Finally, the dynamic simulation of the multi-layer strand wire ropes model was completed. The results indicate that when the multi-layer strand wire rope is in a steady state, the twist angle has the greatest impact on the rotation angle, and under the same conditions, the rotation angle increases with the increase of the twist angle. The rotation angle at steady state is basically consistent with the theoretical calculation results, indicating that the theoretical influence of wire rope twist angle, wire diameter, material, and load on the rotation characteristics of multi-layer strand wire ropes is accurate.
Simulation of the Influence of Rotational Speed on the Crushing of Cement Agglomerates
Authors: Wang Binqiang , Shen Jianjun , Jia Feng , Sun Zehang 
Published: June 2024

AbstractThe uniform dispersion of cement agglomerates during the concrete mixing process affects the overall homogeneity of concrete and adversely affects its strength. To investigate the effect of mixing speed on the crushing of cement agglomerates, this article uses the discrete element software EDEM to simulate the process of crushing of cement agglomerates by collision with aggregates during the mixing process. Within the traditional mixing speed, three different mixing speeds are set to study the crushing ratio of cement agglomerates. The results show that, when other parameters are unchanged and the mixing speed is certain, the breaking of cement bonds shows a rapid increase in time and then a slow increase in time and finally tends to stabilize. To make the cement agglomerates uniformly dispersed, the mixing time should be maintained for more than 15 s at a speed of more than 60 rpm. When the speed is below 50 rpm, the mixing time should be extended and the mixing intensity should be increased.
Structural Stability Analysis of a High Power PEMFC Stack
Authors: Chen Ting , Pan Jie , Zhang Xiao , Guan Dong , Chen Zhen 
Published: June 2024

AbstractAn automobile fuel cell stack mounted horizontally will be subjected to a large impact in the direction parallel with the cells. This may cause interfacial slippage between cells, showing a downward bowing phenomenon, which may cause decay in the performance, and even stack leakage. Therefore, ensuring structural and mechanical integrity is very important in stack assembly design, especially for high power stacks with hundreds of unicells. In this paper, the authors presented numeric analysis for a 300 kW stack with 550 unicells, and analyzed the local vibration from the stack global modes based on finite element analysis (FEA), further evaluated the vibration responses, such as deformed shape and directions, then modified the stack structurally by applying the reinforcement bars, and finally confirmed the robustness of the reinforced stack. It is demonstrated that with proper design, a single stack with hundreds of unicells can be produced for vehicle applications.
Design and Dynamic-Static Characteristics Analysis of Electric Fuel Pump Boost Valve
Authors: Si Guolei , Li Binjie , Li Mengru , Zhou Caibo , Lu Liang , Zhang Zize 
Published: June 2024

AbstractIn response to the challenges of significant power loss and the difficulty in quickly blocking fuel reverse backflow in one-way valves used in electric fuel systems for aerospace engines, this paper proposes a pump boost valve with a main valve spool designed as a baffle structure and equipped with a backflow damping mechanism. The aim of this boost valve is to achieve flow distribution between the main and auxiliary fuel circuits during engine startup, thereby reducing ineffective power loss. The baffle spool design is implemented to block reverse fuel backflow, while the backflow damping mechanism is incorporated to regulate the dynamic and static characteristics of the boost valve. Based on the proposed design, the working principle is analysed, and a dynamic model is established using AMESim for the modelling and simulation study of the boost valve's dynamic and static characteristics. Comparative experiments are conducted between the newly designed boost valve and traditional boost valves, and the accuracy of the simulation model is validated through experimental verification. The experimental results confirm that the newly designed boost valve outperforms traditional valves in terms of reducing power loss and effectively blocking fuel reverse backflow. Additionally, through the analysis of parameters such as spring stiffness, spool diameter, and backflow damping hole, this study optimises the static and dynamic characteristics of the electric fuel pump. By optimizing these structural parameters, the performance of the electric fuel pump is improved, leading to enhanced stability and responsiveness.
Modelling and Finite Element Simulation of Ball-End Milling for Nickel-Based Superalloy Inconel 718
Authors: Zhang Yaoman , Zheng Jin 
Published: June 2024

AbstractComprehensive exploration of ball-end milling processes is presented in this paper, with a primary focus on the modelling of milling forces and the execution of finite element analysis during the machining of Inconel 718, a material known for its challenging machinability. A detailed milling force model, considering various parameters such as cutting speeds, feed rates, and depths of cut, has been developed, providing valuable insights into the optimization of machining parameters. Temperature and stress distributions within the tool during milling, particularly in the context of difficult-to-machine materials like Inconel 718, were investigated through finite element analysis. Critical temperature profiles at the tool tip, rake face, and flank face, which have an impact on tool wear and lifespan, were identified through the temperature field analysis. Notably, a maximum tool tip temperature of 682 °C was observed during the machining of Inconel 718. Challenges posed by difficult materials were unveiled through the stress field analysis, aiding in stress mitigation and enhancing the understanding of machining processes. In conclusion, a significant contribution is made by this paper to the understanding of ball-end milling processes.
Ultimate Strength Test and Numerical Simulation Analysis of Typical Cabin Made of a Novel Steel
Authors: Luan Chen , Lou Pengyu , Wang Hongfu , Wan Qi 
Published: June 2024

AbstractA novel steel was proposed to apply to a ship, thereby enabling ships to safely complete their missions. But it is different in the ultimate bearing capacity between the novel material and traditional low-alloy high-carbon steels. There is little research on it. In this paper, the ultimate strength and the destruction mode of the typical cabin made of the novel steel under the hazardous condition are successfully obtained through a four-point bending test. Numerical simulation of the typical cabin at its limit state is verified by the test. Based on the numerical simulation method, theoretical initial deformation and ideal constitutive relation are introduced, which contributes to more conservative prediction for the ultimate strength of the ship made of the novel steel. This paper has guiding significance for subsequent tests and provides technical support for the structure design of the ship made of the novel steel.
Research of the Flow Field Characteristics of Flake Graphite in the Fan Shaped Nozzle of Premixed Water Jet
Authors: Dong Xing , Guo Chenhao , Chen Jifeng , Song Haorong 
Published: June 2024

AbstractGraphite is an important strategic resource, in order to explore the flow performance of flake graphite in the flow field of the premixed water jet fan nozzle, numerical simulation of nozzle flow field was carried out by FLUENT software. According to the jet characteristics, the Euler model is selected to simulate the two-phase flow law of water and flake graphite, and standard k-ε turbulence model is selected as the turbulence model, the influence of different inlet pressure on the flow field distribution of flake graphite was analyzed. The results show that the axial velocity distribution of flake graphite flow field under different inlet pressures is similar, and the distribution cloud chart has significant plane symmetry, the jet plane diffuses outward at a certain angle. With the increase of target distance, the jet section changes from a flat structure to a symmetrical “groove” structure with high ends and low middle, the axial velocity of flake graphite flow field has secondary acceleration in the internal flow field and primary acceleration in the outward flow field, the maximum axial velocity appears near the nozzle outlet.
A Study on the Parameters Matching of Dynamics System Electric Bulldozer
Authors: Tian Congfeng , Tan Piqiang , Wang Wenpu , Hu Bin , Wang Zhaoliang , Song Jinbao , Xi Hanxiao 
Published: June 2024

AbstractIn this paper, the parameter matching of dynamics system electric bulldozer was proposed. Firstly, Structure and parameters of the electric bulldozer were introduced. Secondly, the speed and power of the motor were calculated. Finally, power battery parameter was calculated. The results show the peak torque of the drive motor is 800 N·m, the peak power is 100 kW, the maximum rotational speed is 3000 rpm, the rated rotational speed is 1200 rpm and discharge power of the power battery are 235kw.
Intelligent Construction Machinery SLAM with Stereo Vision and Inertia Fusion
Authors: Lin Tianliang , He Zhongyuan , Wu Jiangdong , Chen Qihuai , Fu Shengjie 
Published: June 2024

AbstractPositioning technology is the foundation of intelligent construction machinery, the current mainstream positioning solution is simultaneous localization and mapping (SLAM) technology, which is mainly divided into lidar SLAM and visual SLAM. Due to the high cost of lidar, it is easy to degrade or even fail in scenes with a single environmental texture; while the cost of vision sensors is low and has a wealth of environmental texture information acquisition capabilities, which can effectively avoid degradation problems. In order to reduce the localization cost of intelligent construction machinery and improve the positioning accuracy, based on the VINS-Fusion stereo visual-inertial tightly coupled system framework, an improved Random Sampling Consensus (RANSAC) algorithm is used to reduce feature mismatch, and the Huber kernel function is used to IMU residuals and visual residuals are constrained to improve the effect of the SLAM system. Compared with the mainstream VINS-Fusion algorithm, the positioning root mean square error of this method on the EuRoC dataset is reduced by an average of 12.41%, which improves the positioning accuracy; simultaneously, the experimental results in the actual scene show that the motion trajectory of the algorithm, it is closer to the real trajectory than VINS-Fusion, which verifies the effectiveness of the method.
Design and Application of Hydraulic Inverted Pendulum
Authors: Ding Guyue , Bian Yongming , Yang Meng 
Published: June 2024

AbstractThis paper briefly describes the designing process of a hydraulic inverted pendulum including hardware and software design. First, the mechanical structure, including the components of the platform will be introduced. Second, the electrical system including controllers for receiving signals from sensors which measure the variables important for controlling inverted pendulum is about to be shown. Afterwards, the paper will present a mathematical model of the whole platform, then shows up an open loop simulation established by AMESim and Simulink in order to analysis its dynamic characteristic. By comparing the simulation result and reality, the rationality of mathematical model is finally verified.
Standard Components Query System Based on Logical Filtering and Semantic Retrieval
Authors: Huang Ziyan , Bian Yongming , Yang Meng 
Published: June 2024

AbstractThe establishment of a robust standard components database is essential in various industries to streamline product development and ensure quality. This paper presents a system for querying standard components data, leveraging the power of logical filtering and semantic retrieval. The structured approach of this system includes a well-defined database structure, logical filtering capabilities at different data levels, and advanced semantic retrieval techniques. The outputs of the system demonstrate its effectiveness in handling user queries, analysing unstructured data, and providing meaningful feedback based on logical filtering outcomes. This research contributes to the efficient utilization of standard components data through an innovative and powerful digital query system.
Energy Management Control Strategy of Series Hydraulic Hybrid Vehicle
Authors: Gong Jie , Zuo Jinyi 
Published: June 2024

AbstractAiming at a series hydraulic hybrid vehicle, the mathematical model and Matlab/Simulink simulation model of the vehicle are established, and the energy management strategy based on rules is put forward. The simulation results show that the control strategy not only realizes four working modes of hydraulic hybrid vehicle, but also improves its fuel economy by 11.9%. It is found that the volume of accumulator and the working pressure range of accumulator are two important parameters that affect the fuel economy of hydraulic hybrid vehicle. Under the condition of a certain accumulator volume, increasing the working pressure range of the accumulator can not only increase the energy storage of the accumulator, but also reduce the idling times of the engine and further improve the fuel economy of the vehicle.
Research on Leveling Strategy of Suspension System of Roadway Heavy-Load Transport Vehicle
Authors: Dai Jianjun , Zhang Hao , Li Wenlei , Guo Rui , Zhao Jingyi 
Published: June 2024

AbstractAs a transport device for underground equipment, the roadway heavy-load transport vehicle needs to ensure its safety and stability during loading and transportation. In order to reduce the overturning risk and improve the stability during transportation, the improved position error leveling method is proposed, and the effectiveness of the scheme is verified by simulation analysis and actual results.
Research on Wading Mobility of a Certain Type of Special Vehicle Based on MPS Method
Authors: Hao Yiyang , Zhou Yunbo , Zhang Ming 
Published: June 2024

AbstractIn order to study the wading mobility of a certain type of special vehicle, a high-precision dynamic model of the special vehicle is built. The vehicle dynamic model is verified by in-situ acceleration test and traction test. Through the dam-break experiment and wet road traction test, the feasibility and reliability of calculating the water impact pressure, buoyancy and solving the fluid–solid coupling problem based on the moving particle semi-implicit algorithm (MPS) are verified. Then, based on the MPS algorithm, a multi-body dynamics-fluid analysis simulation model is built to simulate and analyze the vehicle mobility under the static water wading condition and the water flow lateral impact condition. The relationship between the maximum speed of the vehicle at different water depths and gears under the static water wading condition the and the relationship between the lateral offset of the vehicle and the flow velocity and the deflection angle of the vehicle entering the water in the lateral impact condition are obtained.