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24th IFToMM China International Conference on Mechanism and Machine Science and engineering, IFToMM CCMMS 2024

作者： Xu, Du Mo, Haijie Huang, Long Huang, Juan Yin, Lairong School of Mechanical and Vehicle Engineering Changsha University of Science and Technology Hunan Province Changsha China Hunan Provincial Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle Hunan Province Changsha China College of Electrical and Mechanical Engineering Hunan Agricultural University Hunan Province Changsha China

ISBN: (纸本)9789819614639

This research presents a novel robot system that utilizes a continuous variable stiffness wrist to enhance compliance and accelerate the assembly process. The system is designed explicitly for shaft-hole operations. We developed a wrist that meets the required standards and suggested a combination of active and passive insertion control approaches that are both strong and resilient. This strategy relies on force and visual data. The fundamental concept of the control method is to calculate the position and orientation of the component by utilizing the data on the force exerted during contact between the components and the stiffness of the contact between the shaft and hole portions. This approach transforms the rigid assembly into a flexible contact system. Passive compliance supervision enables the shaft-hole assembly operation to be carried out with minimal alignment mistakes, lowering the precision needed for part alignment. The camera supplies the first positional data of the shaft component for the robot system. The performance of the variable stiffness wrist stiffness is next examined, followed by a discussion of the calculation of relative deformation between parts using contact force information. A novel and strong insertion control strategy, which combines active and passive elements, is introduced. This strategy is based on the measurement of contact force. This control method is highly efficient in achieving shaft-hole assembly, and it is evident that monitoring contact force is crucial for the successful completion of the insertion assembly process. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Robotic assembly

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reliability of system-of-systems: A new challenge of complex engineered systems

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Frontiers of engineering Management 2025年第2期12卷 434-441页

作者： Minghua LI Xing PAN Naimin ZHANG Pengwei HU Yuheng DANG China Academy of Launch Vehicle Technology Beijing 100076China School of Reliability and Systems Engineering Beihang UniversityBeijing 100191China National Key Laboratory of Reliability and Environmental Engineering Beijing 100191China System-of-Systems Center China Aerospace Science and Technology Group Co.Ltd.Beijing 100076China China Academy of Aerospace Standardization and Product Assurance Beijing 100071China

The emergence of systems-of-systems (SoS) brings new challenges for reliability research within the field of system-of-systems engineering (SoSE). In response, this study examines the requirements for measurement, evaluation, and design/testing of SoS reliability. Drawing on research practice in aerospace engineering, it outlines the concept of equipment SoS and proposes a corresponding research framework for equipment SoS reliability. By analyzing both the reliability demands of SoSE and the current research practice in aerospace equipment SoS, this study identifies several key challenges: Modeling of SoS and its reliability, network reliability in SoS, propagation and recovery of disturbances in SoS, reliability design and simulation methods, and reliability management in SoSE.

关键词： system-of-systems(SoS) architecture reliability network reliability resilience

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Hybrid deep neural network based prediction method for unsteady flows with moving boundary

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Acta Mechanica Sinica 2021年第10期37卷 1557-1566,I0003页

作者： Ren-Kun Han Zhong Zhang Yi-Xing Wang Zi-Yang Liu Yang Zhang Gang Chen State Key Laboratory for Strength and Vibration of Mechanical Structures Shannxi Key Laboratory for Environment and Control of Flight VehicleSchool of Aerospace EngineeringXi’an Jiaotong UniversityXi’an710049China Science and Technology on Reliability and Environment Engineering Laboratory Beijing Institute of Structure and Environment EngineeringBeijing100076China

Any motion, forced or free, of boundary affects the flow field around this boundary. A new kind of reduced order model (ROM) based on hybrid deep neural network is proposed to model flow field evolution process of unsteady flow around moving boundary. This hybrid deep neural network can map the relationship between the flow field at the next time step and the flow field and boundary positions at the previous time steps. Based on the learned information, the hybrid deep neural network can quickly and accurately predict the flow field. Unsteady flows around forced oscillation cylinder with various amplitudes, frequencies, and Reynolds numbers are simulated to establish the training and testing datasets. The prediction results of the hybrid deep neural network and the computational fluid dynamics (CFD) simulation results are consistent with high accuracy. The forces on the moving boundary can be integrated through the predicted flow field data. Good performance makes this new ROM method can be used in many fluid dynamics research fields, which needs fast and accurate simulation.

关键词： Deep neural network Flow fields prediction Moving boundary

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Motion Characteristics of a Novel Capsule Robot for Sampling Gastric Juice Based on Origami 24th

Motion Characteristics of a Novel Capsule Robot for Sampling...

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24th IFToMM China International Conference on Mechanism and Machine Science and engineering, IFToMM CCMMS 2024

作者： Huang, Long Tang, Lingling He, Changyan Yin, Lairong Chen, Gengbiao School of Automotive and Mechanical Engineering Changsha University of Science and Technology Changsha410114 China Hunan Provincial Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle Changsha University of Science and Technology Changsha410114 China The University of Newcastle CallaghanNSW2308 Australia

ISBN: (纸本)9789819614639

For many medical applications, it is necessary to sample and test the internal environment nondestructively, such as sampling the gastric juice and evaluating the intestinal microbiome. In this paper, we propose a novel soft capsule robot for sampling gastric juice based on rigid origami, which can be opened through magnetic actuation. The application of the origami pattern in the capsule robot reduces deformation and stress at each compliant joint when the capsule robot undergoes configuration transformation. Then we conduct kinematic analysis of the capsule-shape origami pattern, and verified that the origami pattern is a rigid-foldable 1-DOF origami pattern. Finally, through the preliminary experiment on the robot prototype, we verified the ability of the proposed robot for the required sampling task. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Medical applications

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Injury severity analysis of electric bike crashes in Changsha, Hunan Province: taking different lighting conditions into consideration

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Transportation Safety and Environment 2022年第3期4卷 43-54页

作者： Lin Hu Xiaotong Wu Xinting Hu Fang Wang Ning Wu School of Automotive and Mechanical Engineering Changsha University of Science and TechnologyChangsha 410114HunanChina Hunan Province Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle Changsha University of Science and TechnologyChangsha 410114HunanChina Institute for Traffic Engineering and Management Ruhr-University BochumD-44780 BochumGermany.

With the increasing use of electric bikes, electric bike crashes occur frequently. Analysing the influencing factors of electric bikecrashes is an effective way to reduce mortality and improve road safety. In this paper, spatial analysis is performed by geographicinformation system (GIS) to present the hot spots of electric bike crashes during daylight and darkness in Changsha, Hunan Province,China. Based on the Ordered Probit (OP) model, we studied the risk factors that led to different severities of electric bike *** results show that the main influencing variables include age, illegal behaviour, collision type and road factors. During daylightand darkness, elderly electric bike riders over the age of 65 years have a higher probability of fatal crashes. Not following trafficsignals and reverse driving are significantly related to the severity of riders’ injuries. In darkness, frontal collisions are significantfactors causing rider injury. In daylight, more serious crashes will be caused in bend and slope road segments. In darkness, roadswith no physically separated bicycle lanes increases the risk of riders being injured. Electric bike crashes are mainly concentratedin the commercial, public service and residential areas in the main urban area. In suburbs at darkness, electric bike riders are morelikely to be seriously injured. Adding protectionmeasures, such as improved lighting, non-motorized lane facilities and interventionstargeting illegal behaviour in the hot spot areas can effectively reduce the number of electric bike crashes in complex traffic.

关键词： Electric bike crash GIS Ordered Probit model daylight darkness

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Dynamics Modeling and Simulation of Multi-rotor UAV based on the Composite Wind Field Model 13

Dynamics Modeling and Simulation of Multi-rotor UAV based on...

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13th International Conference on reliability, Maintainability, and Safety, ICRMS 2022

作者： Wang, Jingru Yang, Jianfeng Yang, Zhongqing Key Laboratory of Unmanned Aerial Vehicle Technology Nanjing University of Aeronautics and Astronautics Ministry of Industry and Information Technology Nanjing210016 China Reliability and Environmental Engineering Center China Electronic Product Reliability and Environment Testing Research Institute Guangzhou China

ISBN: (数字)9781665486903

ISBN: (纸本)9781665486903

To study the influence of compound wind field disturbance on the stability of multi-rotor UAV(unmanned aerial vehicle), a dynamics modeling and simulation method for multi-rotor UAV under the compound wind field model is proposed. Firstly, based on the idea of equivalent modeling in practical engineering, the models of uniform wind, gust, turbulence and wind shear are constructed respectively. The numerical analysis and simulation research are then carried out. Second, the dynamic model of multi rotor UAV under the action of composite wind field is deduced, and the attitude control model is derived. Finally, the numerical analysis software is utilized to simulate and analyze the attitude response of the multi-rotor UAV under the condition of wind and no wind, and analyze its control performance under the interference of compound wind field. The simulation results show that the dynamic model of the multi-rotor UAV under the influence of the wind field can accurately reflect its dynamic performance under the action of the wind field, and the output attitude angle fluctuation is less than 2°. The obtained results show that the established wind field model can be effectively applied to the research on the flight performance of multi-rotor UAV under the interference of compound wind field. © 2022 IEEE.

关键词： Antennas

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Strain effects on the interfacial thermal conductance of graphene/h-BN heterostructure

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Nano Materials Science 2022年第3期4卷 227-234页

作者： Feng Liu YouKun Gong Rui Zou Huiming Ning Ning Hu Yaolu Liu Liangke Wu Fuhao Mo Shaoyun Fu Cheng Yan College of Aerospace Engineering Chongqing UniversityChongqing400044China School of Mechanical Engineering Hebei University of TechnologyTianjin300401China State Key Laboratory of Reliability and Intelligence Electrical Equipment Hebei University of TechnologyTianjin300130China National Engineering Research Center for Technological Innovation Method and Tool Hebei University of TechnologyTianjin300401China College of Mechanical and Vehicle Engineering Hunan UniversityChangsha410082China School of Chemistry Physics and Mechanical EngineeringQueensland University of Technology(QUT)BrisbaneQLD4001Australia

Previous experimental and computational results have confirmed that the thermal conductivity of a twodimensional(2D) material can be considerably affected by strain. Numerous attention has been paid to explore the relevant mechanisms. However, the strain effects on the interfacial thermal conductance(ITC) of 2D heterostructure have attracted little attention. Herein, the non-equilibrium molecular dynamics(NEMD) simulations were conducted to the graphene/hexagonal boron nitride(GR/h-BN) heterostructure to investigate the strain effects on the ITC. Three types of strains were considered, i.e., tensile strain, compressive strain, and shear *** results indicate that the strain can adjust the ITC for the GR/h-BN heterostructure effectively, and the strain loading direction also influences the ITC. Generally, the tensile strain reduces the ITC of the heterostructure, in addition to the BN-C system at small tensile strain;both the compressive strain and shear strain increase the ITC,especially at a small strain. For the NB-C system, it is more sensitive to the strain loading direction and the yx shear strain of 0.06 is the most effective way to strengthen the ITC. Our results also show that the out-of-plane deformation weakens the in-plane vibration of atoms, leading to a reduction of the interfacial thermal energy transport.

关键词： Graphene h-BN Heterostructure Strain engineering Interfacial thermal conductance NEMD

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A calculation method of gear tooth surface wear considering the center distance error

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Wear 2025年 570卷

作者： Wang, Hongbing Feng, Shicheng Yin, Lairong Hu, Bo Su, Jie Liu, Huihua Zhou, Changjiang Hunan Provincial Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle Changsha University of Science and Technology Changsha410114 China Xuchang Tobacco Machinery Co. Ltd. Xuchang461000 China Beijing Engineering Research Center of Precision Measurement Technology and Instruments Beijing University of Technology Beijing100124 China State Key Laboratory of Advanced Design and Manufacturing Technology for Vehicle Hunan University Changsha410082 China

In gear transmission, manufacturing/installation error and bearing radial clearance led to the variation of the center distance, changing the contact characteristic and subsequently affecting the wear behavior and the fatigue life of the tooth surfaces. In this work, a center distance error model of the gears with the manufacturing/installation error and the bearing radial clearance was derived, and a nonlinear dynamic model of the gear pair considering the variation of the center distance was established. The contact pressure distribution on the tooth surfaces under the dynamic load was obtained by combining the gear meshing principle and the Hertzian contact theory. A general calculation model of the sliding distance between the contact points in the meshing process of the gear pair was derived based on the single point observation method, and the wear depths of the tooth surfaces under the quasi-static and the dynamic load considering the center distance error were determined based on the Archard's adhesive wear model. The presented work found that the wear depth of the tooth surface under the dynamic load fluctuates around the wear depth distribution under the quasi-static load. When considering the center distance error caused by the manufacturing/installation error and the bearing radial clearance, the maximum wear depth at the tooth tip of the driving gear increases as the actual center distance increases, while the maximum wear depth at the tooth root decreases. As for the driven gear, the maximum wear depth at the tooth tip decreases as the actual center distance increases, while the maximum wear depth at the tooth root increases with the actual center distance. The conclusions in this research work can provide a basis for the strength enhancement design of the gears which performance is affected by the center distance error such small-modulus gear pair. © 2025 Elsevier B.V.

关键词： Gear teeth

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Effectiveness Assessment and Improvement for Vulnerable Road User Head Protection Testing and Evaluation Program Based on Real-world Accident Reconstructions

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Zhongguo Gonglu Xuebao/China Journal of Highway and Transport 2025年第3期38卷 177-187页

作者： Wang, Fang Liu, Zhang-Chi Hu, Lin Zou, Wei Shi, Liang-Liang Liu, Yu Zhou, Zhou School of Automotive and Mechanical Engineering Changsha University of Science & Technology Hunan Changsha410114 China Hunan Province Key Laboratory of Safety Design and Reliability Technology for Engineering Vehicle Hunan Changsha410114 China China Automotive Engineering Research Institute Co. Ltd. Chongqing401122 China Division of Neuronic Engineering KTH Royal Institute of Technology Stockholm14152 Sweden

Vulnerable road users (VRUs) face high risks of injury and death from traffic accidents. The current VRU head protection program relies on a single head impact velocity and injury assessment criteria that fail to account for brain tissue strain. This limitation affects the effectiveness of simulating real-world impacts and the accuracy of head injury risk assessments. In this study, the VRU head impact boundary conditions were extracted based on the reconstruction of 40 real-world pedestrian VRU head impacts. Using the Total Human Model for Safety (THUMS) head finite element model and headform impactor, this study explored the effects of real head impact boundary conditions on head kinematics and injury under procedural test scenarios and compared these conditions with test procedure scenarios. The results indicate that the peak linear acceleration in the current test procedure scenarios is higher;however, the peak rotational velocity is significantly lower than that observed in real-world accidents. Different impact locations have significant effects on the head kinematics and injury response parameters, particularly in stiffer areas, such as the windshield edges and lower right corner, where the injury risk under regulatory conditions is higher than that in real accident cases. In contrast, the opposite is true in other windshield areas. This study suggests that future programs or virtual assessments should diversify the head impact boundaries and injury assessment criteria to consider the differences in impact locations and the effects of head rotation on brain tissue injuries. For most windshields (non-edge areas), increasing the linear velocity enhances head rotation, and rotational injury assessment criteria should therefore be introduced. For future virtual assessments, injury criteria based on brain tissue strain should be used to assess VRU head injury risk in real accidents more comprehensively and accurately. © 2025 Chang'an University. All rights reserve

关键词： Windshields

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New method for controlling minimum length scales of real and void phase materials in topology optimization

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Acta Mechanica Sinica 2020年第4期36卷 805-826页

作者： Xuanpei Rong Jianhua Rong Shengning Zhao Fangyi Li Jijun Yi Luo Peng School of Automotive and Mechanical Engineering Changsha University of Science and TechnologyChangsha 410076Peopled Republic of China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan UniversityChangsha 410082People’s Republic of China Key Laboratory of Lightweight and Reliability Technology for Engineering Vehicle of Hunan Province dhangsha University of Science and TechnologyChangsha 410114Peopled Republic of China

Minimum length scale control on real and void material phases in topology optimization is an important topic of research with direct implications on numerical stability and solution *** it also is a challenge area of research due to serious conflicts of both the solid and the void phase element densities in phase mixing domains of the topologies obtained by existing ***,there is few work dealing with controlling distinct minimum feature length scales of real and void phase materials used in topology designs.A new method for solving the minimum length scale controlling problem of real and void material phases,is ***,we introduce two sets of coordinating design variable filters for these two material phases,and two distinct smooth Heaviside projection functions to destroy the serious conflicts in the existing methods(*** Comput Methods Appl Mech Eng 199(14):123-135,2009).Then,by introducing an adaptive weighted 2-norm aggregation constraint function,we construct a coordinating topology optimization model to ensure distinct minimum length scale controls of real and void phase materials for the minimum compliance *** adopting a varied volume constraint limit scheme,this coordinating topology optimization model is transferred into a series of coordinating topology optimization sub-models so that the structural topology configuration can stably and smoothly changes during an optimization *** structural topology optimization sub-models are solved by the method of moving asymptotes(MMA).Then,the proposed method is extended to the compliant mechanism design *** examples are given to demonstrate that the proposed method is effective and can obtain a good 0/1 distribution final topology.

关键词： Structural topology optimization Minimum length scale Manufacturability Coordinating density filter Heaviside projections Void phase

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