bluuebunny/crossref_metadata_2025_split huggingface dataset:
Finite Element Simulation of Loss Stroke Phenomenon of Shock Absorber Based on Fluid Structure Interaction
Authors: Yu Zhen-huan , Zhang Na 
Published: June 2024

AbstractTo provide a design reference with guaranteed performance for vehicle shock absorbers, the loss stroke mechanism is studied in this paper based on fluid–structure interaction (FSI) numerical method. According to the parametric model of cavitation mechanism and by applying fluid–structure interaction (FSI) numerical methods, the structural and fluid finite element mesh shock absorber models with high precision are both established. Furthermore, simulations for the proposed models are carried out based on ADINA software. By analyzing the simulation results, the specific position and the distribution of loss stoke, and the difference of cavitation phenomenon under diverse shock absorber loading speeds are revealed. The results indicate that cavitation of the shock absorber primarily centers around the shock absorber valve system, and this phenomenon becomes increasingly pronounced as the piston speed rises. Moreover, the cavitation effect is higher apparent when the shock absorber oil possesses higher viscosity. These findings offer valuable insights for the design and implementation of measures aimed at preventing performance distortion in shock absorbers.
Research on TBM Disc Cutter Wear Prediction Based on CSM Model
Authors: Wang He , Wei Junkun , Yan Guangyu , Zhao Haigen , Xu Jianing 
Published: June 2024

AbstractThe wear of disc cutters significantly impacts the efficiency and cost of TBM operations. In this study, we established a calculation model for radial wear based on the CSM formula and abrasive wear mechanisms. Experimental validation of the wear mechanism confirmed that abrasive wear is the primary mechanism responsible for disc cutter wear. The predictive model was subjected to engineering validation, where the calculated values from the model were compared and analyzed against actual on-site measurements. This validation process confirmed the accuracy and applicability of the model.
Fatigue Life Assessment of Ship Hatch Corner Based on Hot Spot Stress Method
Authors: Qiao Langhao , Yan Renjun , Qiu Yu 
Published: June 2024

AbstractThe hatch corner of ship is the most prone area for stress concentration, which makes the fatigue problem of hatch corner particularly serious, and becomes a position that is easily damaged. Firstly, the hot spot stress method based on surface extrapolation is introduced, and the hatch corner of a bulk carrier is selected as the research object, the scale model test is designed and carried out, the finite element model is established, and the parameters of the corner form and different transition radii are analyzed. The CCS calculation specification evaluates the fatigue strength of hatch corner, and compares the test results with the finite element calculation results. The results show that the hot spot stress method has good adaptability to the fatigue assessment of hatch corner, and the fatigue strength evaluation of hatch corner needs to select the corresponding S–N curve according to the position of the maximum hot spot stress. The form of corner and the increase of transition radius are of great significance for alleviating stress concentration effect and improving fatigue life of corner, which provides reference for fatigue resistance and optimal design of hatch corner structure.
Research on Dynamic Simulation of Crane Movable Pulley System with Defects
Authors: Li Shuo , Zhang Hongsheng , Wang Xiangxiang 
Published: June 2024

AbstractThe movable pulley block failure can lead to catastrophic crane accidents, so the dynamic performance of a defective movable pulley block system is essential. Based on ANSYS contact analysis through APDL command, a pulley block simulation platform is developed, which can be used for dynamic analysis of defective pulley systems. Firstly, a parameterized 2D contact model is established and validated through static analysis. Then, dynamic simulation analysis for the intact pulley block under two working conditions is performed: lifting from the ground and sudden unloading. Finally, COMBIN 37 is used as a defective element, and dynamic simulations are analyzed for the faulty pulley system with hook or wire rope rupture. The analysis results show that the longer the unloading time and the shorter the wire rope length will lead to a minor impact under hook rupture and sudden unloading conditions. Meanwhile, if the unloading time is consistent, the dynamic analysis of the intact pulley block under sudden unloading and defective pulley block with hook rupture are equivalent. It is worth noting that when the steel wire ropes on both sides of the moving pulley break simultaneously in a defective system, it will cause a more significant horizontal impact force. This study demonstrates that ANSYS contact analysis with COMBIN 37 as the defective element can accurately and efficiently apply the dynamic simulation of a crane movable pulley system with defects.
Research on Characteristics of Three-Chamber Hydraulic Cylinder Driving Loader Boom
Authors: Zhu Huidian , Feng Jiangjiang , Yang Jing 
Published: June 2024

AbstractWhen the loader boom is lifted and lowered, the hydraulic pump operates at high peak power levels. In this process, the hydraulic valve port dissipates the gravitational potential energy of the boom. Consequently, the dissipated energy is converted into thermal energy, resulting in elevated hydraulic oil temperature and reduced energy efficiency. This paper proposes a gravitational potential energy recovery system based on three-chamber cylinder and a hydraulic accumulator. The system utilizes the hydraulic accumulator to balance the weight of the loading boom and achieve energy recovery for the boom. The co-simulation model of wheel loader based on the three-chamber cylinder was built in SimulationX, then the energy consumption was analyzed under two kinds of typical operating modes. The simulation results illustrate that when the initial pressures of accumulators are 6 and 8 MPa with heavy-load and without load, the system has the highest energy utilization rate. By establishing a loader prototype and investigating the operating characteristics and energy efficiency of the boom driven by a two-chamber cylinder and a three-chamber cylinder, the experimental results illustrate that the new system operates smoothly, reducing energy consumption by 39.24% and peak power by 27.41%.
Experimental Study on the Cohesive Model of Steel-Carbon Fiber Reinforced Plastic Interface by Laser Treatment
Authors: Teng Hao , Wan Hailang , Min Junying 
Published: June 2024

AbstractThe interfacial bonding performance between steel and CFRP significantly influences the mechanical properties of steel-CFRP hybrid structures. Surface treatment is commonly employed to enhance the bonding interface of steel-CFRP. Laser surface treatment is particularly advantageous due to its high efficiency, automatic production capabilities, and widespread use in enhancing interfacial bonding performance. However, little attention has been given to the impact of laser surface treatment on the property parameters that describe the cohesive mode's mechanical behavior at the steel-CFRP interface. This study examined the cohesive zone modes of both original and laser-treated steel-CFRP joints through a double lap shear test following ASTM D3528-96 (2016) standards. Non-contact strain measurement was conducted using 3D digital image correlation techniques. The analysis indicates that the bilinear cohesive model effectively describes the mechanical behavior of the steel-CFRP interface. Laser surface treatment resulted in a respective increase of 83.8% in maximum shear strength, 111.6% in the relative slip corresponding to maximum shear strength and 116.8% in maximum relative slip. Consequently, this study showcases the efficacy of laser surface treatment in improving the mechanical performance at the steel-CFRP interface while quantitatively assessing these improvements through performance parameters within the cohesive zone model.
Study on Blast Resistance of Armored Steel Welded Joint Structures
Authors: Wu Song , Zhang Ming , Zhou Yunbo 
Published: June 2024

AbstractIn order to study the anti-detonation performance of welded joint structure of armored steel, the finite element analysis of welded joint structure under explosion impact was carried out by using material assignment method and structured ALE algorithm (S-ALE), and the accuracy of the model was verified by explosion impact test. The central deformation and failure form of each weld structure under different equivalent loads of a single explosion are studied. Repeated explosive loading of weld structure based on complete restart technology; The cumulative analysis of plastic deformation of weld structure under multiple explosions is realized, and the relationship between central deformation and explosion times and explosion equivalent is obtained.
Aerodynamic Characterization of a Ballistic-Correction Bullet
Authors: Zhang Hongyue , Wu Zhilin 
Published: June 2024

AbstractObtaining the aerodynamic parameters of a ballistic-correction bullet is crucial for improving ballistic correction efficiency and enhancing shooting accuracy. In this study, a numerical simulation method is utilized to analyze and calculate the aerodynamic characteristics of the bullet. The focus is on investigating the changes in aerodynamic parameters when the rudder wings are in both unexpanded and expanded states, as well as analyzing the impact of deflection angles on the bullet's aerodynamic characteristics. The simulation results demonstrate that the bullet exhibits favorable aerodynamic performance and static stability when the rudder wings are unexpanded, leading to improved ballistic correction efficiency during flight. Moreover, the results indicate that in the expanded state of the rudder wings, increasing the deflection angle enhances the impact on the bullet's aerodynamic characteristics, resulting in more pronounced changes and stronger correction capabilities. This research provides valuable insights into the aerodynamic characteristics of ballistic-correction bullets.
Experimental Studies on the Load Characteristics of Low-Speed Droplets Impinging onto Surface
Authors: Li Guandong , Qu Qiulin , Liu Peiqing 
Published: June 2024

AbstractDroplet impingement on a wall is a fundamental scientific problem with wide engineering applications. When a droplet impacts the surface of an aircraft, it generates shock waves, airflow disturbances, and splashing phenomena. This not only has a negative impact on the aerodynamic performance and stability of the aircraft but also obstructs the field of view of optical sensors or causes distortion in optical devices. It can also damage the aircraft's structure, thus it’s vital to assess the droplet impact force for flight safety. However, droplets are often treated as rigid spheres for simplicity, but this does not reflect the real physical situation. In this paper, we utilized high-precision force sensors and high-speed imaging technology to experimentally investigate the impact dynamic of droplet impingement on a dry wall. The temporal evolution of force, the associated morphology changes and their relationship during collisions were analyzed systematically, we also elucidated the physical mechanisms underlying flow phenomenon. An unified and accurate mechanical model were established for droplet impingement, providing guidance for related engineering designs.
Load and Deformation Distribution Along the Bolt During Assembly Process
Authors: Li Zhixiang , Zhao Zhen , Zhang Jiaying 
Published: June 2024

AbstractBolt connection structure is widely utilized in modern large-scale equipment. Understanding the stress distribution along the bolt during assembly process is essential for improving its reliability. In this paper, assembly torque model is established to formulate the relationship between tightening torque and preload force, and a linear proportionality between them is obtained. The stress distribution during assembly process is modeled. Rotation angle and displacement distribution can be obtained from the proposed method. To validate our model, numerical simulation analysis is carried out to obtain the load and deformation distribution under different conditions. Comparison with the previous literature confirms the accuracy of the proposed model.
Stiffness and Strength Analysis of 2D Woven Composite Materials Based on Multi-scale Finite Element Method
Authors: Wang Weiye , Yan Renjun , Liu Kang , Qiu Yu 
Published: June 2024

AbstractThis study is based on the multi-scale finite element method and establishes RVE model of 2D woven fiber yarn and woven structure. The Stiffness matrix of plain, satin and twill 2D braided composites is calculated by applying Periodic boundary conditions and tensile shear loads in six directions. Write a UMAT subroutine to perform finite element simulation of the strength of woven RVE based on the three-dimensional Hashin failure criterion, and compare and verify it with existing experimental data. By comparing the load displacement curves of three types of braided composite materials under the same volume fraction, the stiffness and strength characteristics of the three types of braided composite materials, as well as the mechanical performance similarity issues caused by structural similarity, are studied.
Simulation Study of Shear Stress Distribution in Bolted Connection Structures of Sandwich Composite Plate
Authors: You Ruizhang , Yan Renjun , Zhu Haowen , Zhang Ziwei 
Published: June 2024

AbstractFor the shear problem of the bolt connection structure of Sandwich Composite Plate, shear test is carried out on two kinds of Bolt Connection Structure of Sandwich Composite Plate, namely, Pre-embedded countersunk bolt and Assembled countersunk bolt, and the shear strength and stress distribution of the two kinds of bolt connection structure are investigated by using ABAQUS, and the finite element simulation results coincided with the test phenomenon well. Using this model, the stress distribution under shear damage of the Bolt Connection Structure of Sandwich Composite Plate is analysed, and the influence of bolt preload is also analysed, and the results showed that: the stress of the Sandwich Composite Plate is mainly concentrated in the Skin on the bottom side, and gradually decreased to the top surface; the influence of bolt preload could be disregarded in the analysis of the shear strength and stress peak of the Sandwich Composite Plate.
Research and Practice on the Validation Testing Method of Safety of the Intended Functionality for High Way Assist Function
Authors: Guo Kuiyuan , Zhang Jiarui , Shi Juan , Zhang Zhiqiang , Ji Guotian 
Published: June 2024

AbstractWith the continuous development of the level of driving automation, the need for safety of the intended functionality (SOTIF) has gradually become prominent. As an important part of ensuring that vehicles meet the requirements of SOTIF, unknown scenario verification methods urgently need research and breakthroughs. A customized SOTIF verification test method for highway Assist (HWA) function based on Design Operation Domain (ODD) and a test route formulation method based on multi-dimensional key elements are studied and proposed. This method considers the data dimensions and environmental characteristics involved when deriving the acceptance criteria, and effectively meets the effective and practicable requirements of unknown scenario tests.
Improved Bidirectional Dynamic JPS Algorithm for Global Path Planning of Mobile Robot
Authors: Liu Ronghua , Wang Xin , Wu Di , Xie Chunyuan 
Published: June 2024

AbstractThis paper proposed to improve the bidirectional dynamic JPS algorithm in order to address the issues with the jump point search algorithm in the process of pathfinding, such as numerous path inflection points, numerous intermediate search hop points, numerous extended nodes, and lengthy pathfinding time in the process of finding jump points. The algorithm was based on the two-way dynamic hopping point search algorithm, defined the target points in the forward and reverse expansion directions dynamically, defined the heuristic function dynamically. In the process of searching each other from the starting point and the target point, the dynamic constraint ellipse was constructed to limit the expansion area of the jump point. The simulation results show that the optimized bidirectional dynamic JPS algorithm has a certain performance in general maps, especially in indoor environment maps with fewer obstacles and the target point is close to the starting point.
Accurate Finite Element Modeling of Bolted Joints and Modified IWAN Model
Authors: Li Jiuyi , Sun Yunhou , Yan Qiang , Kang Huaiqiang , Wang Haoxiang , Dong Shangwei 
Published: June 2024

AbstractA three-dimensional finite element model of helical bolted joints is established in this paper, and the validity of the model establishment scheme is verified by a numerical examples of “the stress distribution on the bolted joint”. Then, Hysteresis curves of the resultant torque versus the applied torsion angle are obtained from the finite element analysis. The results indicate that: (1) The contact threads have experienced three states of adhesion, partial slip and macro slip during the tightening and loosening process; (2) In the state of macro sliding, the resultant torque exhibits an upward trend due to the increase of the clamping pressure in tightening process. On the contrary, the resultant torque exhibits a downward trend due to the decrease of the clamping pressure in the loosening process. A modified IWAN model is established for the three-dimensional helical bolted joint under torsional load by adding the residual stiffness and correction of torque based on the results of finite element analysis. The results of the modified IWAN model for the M12 bolted joint present that the modified IWAN model can reproduce the hysteresis curves obtained by finite element analysis accurately, and the modified IWAN model composed of three Jenkins elements can cover the dissipated energy precisely.
Research and Practice on Verification Test of Intended Functional Safety Awareness System Based on HWA System
Authors: Zhang Zhiqiang , Liu Shaohua , Shi Zhaoyuan , Shi Juan 
Published: June 2024

AbstractWith the development of driving automation technology, more and more vehicles are equipped with intelligent driving functions. The Ministry of Industry and Information Technology (MIIT) issued in 2021 “Intelligent connected Vehicle production Enterprises and Product Access Management Guide (Trial)” (draft for comment) proposed that “intelligent connected vehicle products should meet the process assurance requirements of functional safety, intended functional safety and cybersecurity.” As the “eyes” of the HWA functional system, the perception system, due to its complexity, may still have safety problems caused by functional limitations such as sensors or algorithms in the absence of faults. Therefore, the intended functional safety analysis and verification methods for the perception system are particularly important to ensure that the system does not have unreasonable safety risks. This paper describes the analysis method of the intended functional safety function deficiency, and puts forward the test verification strategy and test verification method of known hazard scenarios. Taking the HWA system as an example, this paper analyzes the hazard scenario of the HWA perception system based on camera and millimeter wave radar, conducts testing and verification evaluation for typical hazard scenarios, identifies the insufficient function of the HWA perception system, and puts forward functional modification suggestions to ensure that the perception system does not have unreasonable risks.
Simulation of Nanoindentation Technology Based on Rough Surface
Authors: Ye Zihao , Wang Yonghang , Yao Jiasheng , Jiang Jiankang 
Published: June 2024

AbstractIn order to study the influence of roughness on the nanoindentation test, finite element method was used to simulate the nanoindentation test process, and secondary indentation method was further proposed to suppress the influence of roughness on the indentation. After optimizing the indentation parameters, the relative error between the results of nanoindentation simulation for rough surface samples and smooth surface samples is stable within 5%. The secondary indentation method can effectively reduce the influence of roughness on nanoindentation test results.
A Study of the Effect of Frontal Crash Seat Belts on Driver Injury in a Certain Type of Wheeled Tactical Vehicle
Authors: Wang Tao , Zhou Yunbo , Zhang Ming 
Published: June 2024

AbstractA finite element model of frontal collision of a certain type of wheeled tactical vehicle is established, and the collision test method is designed concerning the test requirements of Chinese frontal collision standard GB11551 and Chinese side collision standard GB2007 to get the acceleration inside the vehicle as well as the damage of the occupants, and the model accuracy is verified according to the results of the actual collision test and the simulation test, as well as the change of the energy in the process of the simulation. The Hybrid III 50% male dummy is placed in the driver’s seat, and under the action of different conditions and ways of restraint systems, the damage of each part of the dummy is obtained in the simulation test. The study shows that multi-point seat belts provide better occupant protection compared to traditional three-point seat belts in response to high-impact crash environments. It can improve the direction of the force on the occupant and effectively reduce the occupant injury. The final occupant WIC decreased by 25.9% relative to the initial four-point seat belt position, improving the survival rate of the occupants.
Monitoring potential impacts of climate change on the biodiversity of springs and springbrooks in the Central Alps
Authors: von Fumetti Stefanie , Aberhalden Angelika 
Published: July 2024

AbstractHeadwaters in alpine regions and their biodiversity are particularly threatened by climatic changes. Most predictions on their response to climate change are based on modeling approaches. Empirically gained data rarely exist for glacially influenced and groundwater-fed headwaters. In 2019, long-term monitoring was initiated at 15 springs, 8 springbrooks and 2 brooks in the UNESCO Biosphere Reserve Engiadina Val Müstair. The goal was to gain data on hydro-ecological aspects over several decades to understand whether (1) the environmental conditions change over time and (2) how these changes influence the composition of the species assemblages. Water temperature loggers were installed, pH, electrical conductivity, oxygen, nutrients and discharge were measured three times per year, and ecomorphological features were mapped two times per year. The meio- and macrofauna was sampled in 2019, 2020 and 2021 with a semi-quantitative approach. The results of the first 5 years of monitoring show that the physico-chemistry, water temperature and discharge confirm the stable character typical for groundwater-fed systems. Certain seasonal variability is evident, which possibly indicates an influence of permafrost or snow meltwater. The composition of the species assemblages differs significantly between sites but stays relatively constant over time within a site. Elevation and the availability of wood—parameters indicating forestation—significantly influence the species composition. This study provides a solid baseline on the environmental conditions and the fauna in springs and springbrooks in the Central Alps, which is needed for a proper interpretation of changes identified on a long-term basis.