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7th International Conference on Material and Manufacturing Technology, ICMMT 2016

作者： Korotcenkov, G. Han, S.H. Cho, B.K. School of Material Science and Engineering Gwangju Institute of Science and Technology Gwangju Korea Republic of Division of Maritime Transportation System Mokpo National Maritime University Mokpo Korea Republic of

ISBN: (纸本)9783038357353

The features of conductometric gas sensors based on metal oxide composites are considered. The methods of the composites forming and the advantages of their using in the development of gas sensors are discussed. It is given the analysis of the factors that reduce the effectiveness of the composites using in conductometric gas sensors, which should be taken into account while designing and fabricating sensors based on metal oxide composites. The mechanisms explaining the operation of conductometric gas sensors based on metal oxide composites are also discussed. © 2016 Trans Tech Publications, Switzerland.

关键词： Fabrication

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A Two-Stage Approach for Electric Vehicle Routing Problem with Time Windows and Heterogeneous Recharging Stations

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Tsinghua science and Technology 2024年第5期29卷 1300-1322页

作者： Tianyu Luo Yong Heng Lining Xing Teng Ren Qi Li Hu Qin Yizhi Hou Kesheng Wang School of Electronic Engineering Xidian UniversityXi’an 71007China Beijing Institute of Electronic System Engineering Beijing 100854China School of Logistics and Transportation Central South University of Forestry and TechnologyChangsha 410004China School of Management Huazhong University of Science and TechnologyWuhan 430074China School of River and Ocean Engineering Chongqing Jiaotong UniversityChongqing 400074China Department of Mechanical and Industrial Engineering Norwegian University of Science and TechnologyTrondheim 7491Norway

An Electric Vehicle(EV)is an appropriate substitution for traditional transportation means for diminishing greenhouse gas ***,decision-makers are beset by the limited driving range caused by the low battery capacity and the long recharging *** resolve the former issue,several transportation companies increases the travel distance of the EV by establishing recharging stations in various *** proposed Electric Vehicle-Routing Problem with Time Windows(E-VRPTW)and recharging stations are constructed in this context;it augments the VRPTW by reinforcing battery capacity ***,super-recharging stations are gradually emerging in the *** can decrease the recharging time for an EV but consume more energy than regular *** this paper,we first extend the E-VRPRTW by adding the elements of super-recharging *** then apply a two-stage heuristic algorithm driven by a dynamic programming process to solve the new proposed problem to minimize the travel and total recharging ***,we compare the experimental results of this approach with other algorithms on several sets of benchmark ***,we analyze the impact of super-recharging stations on the total cost of the logistic plan.

关键词： Electric Vehicle(EV) vehicle routing Dynamic Programming(DP) two-stage algorithm

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Adaptive terminal sliding mode control for flexible air-breathing hypersonic vehicle

Adaptive terminal sliding mode control for flexible air-brea...

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AIAA science and Technology Forum and Exposition, AIAA SciTech Forum 2021

作者： Qin, Decong Chen, Haibing Lin, Wei Tang, Peng Ma, Tielin Xu, Cheng School of Transportation Science and Engineering Beihang University Beijing China Aircraft/Engine Integrated System Safety Beijing Key Laboratory Beijing China Beijing System Design Institute of the Electro-mechanic Engineering Beijing China Institute of Unmanned System Beihang University Beijing China Science and Technology on Complex System Control and Intelligent Agent Cooperation Laboratory Beijing China

ISBN: (纸本)9781624106095

Flexible air-breathing hypersonic vehicles show significant and complex aerodynamic, scramjet propulsion system, flight dynamic and elastic coupling characteristics, which usually are highly nonlinear. These result in huge uncertainties, parameter perturbation and internal disturbance, which can no longer be ignored, and therefore, extreme difficulties for flight control design. A unique parameter adaptive non-singular terminal sliding mode method is proposed for longitudinal control law design of a flexible coupling air-breathing hypersonic vehicle. This method uses adaptive reaching law gain instead of additional adaptive compensation term to handle the uncertainty to improve robustness. The stability of the close loop system is proved via a Lyapunov way. The longitudinal tracking control law for velocity and angle of attack is designed based on a rigid dynamic model of a flexible air-breathing hypersonic vehicle. A strong coupling model of the same vehicle, considering aerodynamic-scramjet engine-flight dynamic-elastic couplings, is established as the verification platform of control law designed. Simulation results obtained based on the coupling model demonstrate that the control law designed has good performance and acceptable robustness. © 2021, American institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Hypersonic vehicles

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An Optimal Control Based Trajectory Planning Method for Cooperative Merging Maneuvers 3

An Optimal Control Based Trajectory Planning Method for Coop...

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3rd International Symposium on Intelligent Robotics and systems, ISoIRS 2023

作者： Wang, Qi Ge, Hao Duan, Xuting Zhou, Jianshan School of Transportation Science and Engineering Beihang University State Key Lab of Intelligent Transportation System Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control State Key Laboratory of Air Traffic Management System and Technology Beijing China Nanjing Research Institute of Electronic Engineering State Key Laboratory of Air Traffic Management System and Technology Nanjing China School of Transportation Science and Engineering Beihang University State Key Lab of Intelligent Transportation System Beijing Key Laboratory for Cooperative Vehicle Infrastructure Systems and Safety Control Beijing China

ISBN: (纸本)9798350339963

Due to the prediction errors and diverse driving styles of surrounding vehicles, traffic congestion and even accidents can occur in the traffic bottleneck area where vehicles merge into the main road. To ensure that connected and automated vehicles (CAVs) can quickly and efficiently merge into the main road, this paper proposes a cooperative trajectory planning method based on optimal control for vehicle cut-in scenarios. A optimal control model is constructed, and a quintic polynomial is used to generate the initial solution of the optimal control problem to accelerate the solution process and improve the success rate. Finally, The obtained merging trajectory is then synchronized with the movement of vehicles on the main road to optimize their actions and ensure a safe merging process. Joint simulation with Robot Operating system (ROS) and RVIZ is utilized, and the results show that the proposed algorithm can quickly obtain cooperative results, the locally successful merging trajectory meets the requirements of smoothness and safety, and if the solution does not allow merging, the merging vehicle is instructed to terminate the execution. © 2023 IEEE.

关键词： Trajectories

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Autonomous spacecraft swarm formation planning using artificial potential field based on nonlinear bifurcation dynamics

Autonomous spacecraft swarm formation planning using artific...

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AIAA Guidance, Navigation, and Control Conference, 2017

作者： Chen, Haibing Sun, Jinfeng Li, Kang Wang, Mengmeng Airworthiness Technologies Research Center School of Transportation Science and Engineering Beihang University Beijing100191 China Aircraft/Engine Integrated System Safety Beijing Key Laboratory Beijing100191 China School of Transportation Science and Engineering Beihang University Beijing100191 China Beijing Institute of Control Engineering Beijing100080 China School of Transportation Science and Engineering Beihang University Beijing100191 China

ISBN: (纸本)9781624104503

Spacecraft swarms with huge members, for example, several dozens or hundreds, pose great advantages in many applications such as earth remote sensing, or deep space exploration. However, in traditional spacecraft formation control framework, path planning needs to be settled before orbital maneuver, and every spacecraft in the formation follows the preconditioned path. When the number of spacecraft reaches to swarm level, the control laws by tradition framework become very complex and computation consuming may be too huge to be burdened. A new spacecraft swarm control methodology is proposed by using nonlinear bifurcation dynamics. According to desired spacecraft swarm configuration, artificial force/acceleration filed with bifurcation characteristics can be designed. By only setting few bifurcation parameters, bifurcation may be aroused, and members in spacecraft swarms can be drove to new balanced position under bifurcation dynamics for the purpose of formation capture, maintenance and reconfiguration. The presented method may be more applicable and less calculation consuming for massive spacecraft swarms control. © 2017, American institute of Aeronautics and Astronautics. All rights reserved.

关键词： Space research

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Tensile behavior of additively manufactured Inconel 718 and stainless steel 316L with compositionally graded joints

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International Journal of Plasticity 2025年 189卷

作者： Yaojie Wen Yang Gao Ramasubramanian Lakshmi Narayan Wei Cai Pei Wang Xiaoding Wei Baicheng Zhang Upadrasta Ramamurty Xuanhui Qu Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing 100083 China State Key Laboratory for Turbulence and Complex System Department of Mechanics and Engineering Science College of Engineering Peking University Beijing 100871 China Department of Materials Science and Engineering Indian Institute of Technology Hauz Khas New Delhi 110016 India Department of Mechanical Engineering Stanford University Stanford CA 94305-4040 USA IMRE - Institute of Materials Research and Engineering 2 Fusionopolis Way Innovis #08-03 Singapore 138634 Singapore Beijing Laboratory of Metallic Materials and Processing for Modern Transportation Beijing 100083 China School of Mechanical & Aerospace Engineering Nanyang Technological University Singapore

The microstructure and tensile behavior of laser powder bed fusion (LPBF) processed 316L austenitic stainless steel (316L) and Inconel 718 Ni-based superalloy (IN718) coupons with compositionally graded joints (CGJ), spanning lengths of 0, 10 and 20 mm, in the as built and heat-treated conditions, are investigated. In the as built condition, the microstructure of pure 316L and IN718 ligaments consist of micron-sized sub-grains present within 〈001〉 textured columnar grains, whereas CGJs contain a mixture of randomly textured columnar and equiaxed grains. Heat treatment, involving solutionizing above 1040 °C with subsequent ageing at 720 and 620 °C, leads to the recrystallization of portions with > 85 wt. % IN718 of the CGJ coupons. Higher composition gradient span, in both the as built and heat-treated states, improves the yield and tensile strengths of the specimens, but compromises ductility. Simulations indicate that CGJs with shallower composition gradients have lower fluctuations in the stress triaxiality, von mises equivalent stress, and the maximum shear stress compared to those with sharper gradients. These mechanical property variations and the deformation characteristics of the CGJ specimens are analyzed in detail by considering the varying degrees of plastic constraint on the 100 wt. % 316L and the degree of interactions between strain-generated dislocations and geometrically necessary dislocations. Finally, the effectiveness of CGJ in enhancing the tensile properties of the 316L/IN718 joints and the geometrical considerations for designing such joints for different alloy combinations is discussed.

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Rapid prediction model for fatigue life of composite laminates

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engineering Failure Analysis 2025年 178卷

作者： Jiaxing Sun Wenfeng Pan Lingyu Sun Rihan Wang Bingyan Shi School of Transportation Science and Engineering Beihang University 37 Xueyuan Road Haidian District Beijing 100191 China Beijing Key Laboratory for High-efficient Power Transmission and System Control of New Energy Beijing 100191 China Beijing Hangshu Vehicle Data Research Institute Co. LTD. Beijing 100062 China

Composite laminates provide exceptional design flexibility to meet diverse structural fatigue performance requirements through tailored combinations of fiber orientations and lay-up sequences. However, numerical simulations during the conceptual design phase require S-N curves corresponding to different design schemes as input to predict structural fatigue life. Experimentally deriving S-N curves for all possible designs is both time-consuming and costly. This study developed two analytical models or empirical formulas for engineering prediction solely based on the S-N curves of 0° and 90° unidirectional laminates (UDLs) to rapidly obtain that of arbitrary laminates. One model corresponds to UDLs with arbitrary fiber orientations, while the other corresponds to multidirectional laminates (MDLs) with arbitrary lay-up sequences. The weighting coefficient function for UDLs is derived from intralayer failure mechanisms, whereas for MDLs, it incorporates both intralayer and interlayer failure contributions. The analytical model is validated using experimental data from UDLs/MDLs GFRP laminates, with the R 2 exceeding 0.7940, and an efficiency enhancement of 48 %. Finally, an application example is provided to illustrate the use of the analytical model for estimating the fatigue life of composite structures.

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Condition monitoring and fault diagnosis strategy of railway point machines using vibration signals

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transportation Safety and Environment 2023年第2期5卷 27-37页

作者： Yongkui Sun Yuan Cao Haitao Liu Weifeng Yang Shuai Su National Engineering Research Center of Rail Transportation Operation and Control System Beijing Jiaotong UniversityBeijing 100044China CRRC Zhuzhou Institute Co Ltd Zhuzhou 412001HunanChina Frontiers Science Center for Smart High-speed Railway System Beijing Jiaotong UniversityBeijing 100044China

Condition monitoring of railway point machines is important for train operation safety and *** to the fields of mechanical equipment fault detection,this paper proposes a fault detection and identification strategy of railway point machines via vibration signals.A comprehensive feature distilling approach by combining variational mode decomposition(VMD)energy entropy and time-and frequency-domain statistical features is presented,which is more effective than single type of *** optimal set of features was selected with ReliefF,which helps improve the diagnosis *** vector machine(SVM),which is suitable for a small sample,is adopted to realize *** diagnosis accuracy of the proposed method reaches 100%,and its effectiveness is verified by experiment *** this paper,vibration signals are creatively adopted for fault diagnosis of railway point *** presented method can help guide field maintenance staff and also provide reference for fault diagnosis of other equipment.

关键词： railway point machines condition monitoring variational mode decomposition(VMD)energy entropy statistical features

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Pressure-tracking control of a novel electro-hydraulic braking system considering friction compensation

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Journal of Central South University 2017年第8期24卷 1909-1921页

作者：雍加望高峰丁能根 HE Yu-ping School of Transportation Science and Engineering Beihang UniversityBeijing 100191China Beijing Key Laboratory for High-efficient Power Transmission and System Control of New Energy Resource Vehicle Beijing 100191China Department of Automotive Mechanical and Manufacturing EngineeringUniversity of Ontario Institute of TechnologyOshawa L1H 7K4Canada

This work presents an integrated pressure-tracking controller for a novel electro-hydraulic brake(EHB) system considering friction and hydraulic disturbances. To this end, a mathematical model of an EHB system, consisting of actuator and hydraulic sub-systems, is derived for describing the fundamental dynamics of the system and designing the controller. Due to sensor inaccuracy and measurement noise, a Kalman filter is constructed to estimate push rod stroke for generating desired master cylinder pressure. To improve pressure-tracking accuracy, a linear friction model is generated by linearizing the nonlinear Tustin friction model, and the unmodeled friction disturbances are assumed unknown but bounded. A sliding mode controller is designed for compensating friction disturbances, and the stability of the controller is investigated using the Lyapunov method. The performance of the proposed integrated controller is evaluated with a hardware-in-the-loop(HIL) test platform equipped with the EHB prototype. The test results demonstrate that the EHB system with the proposed integrated controller not only achieves good pressure-tracking performance, but also maintains robustness to friction disturbances.

关键词： electro-hydraulic brake brake-by-wire Kalman filter sliding mode control pressure-tracking friction compensation

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Energy-Efficient Incremental Control Allocation for Transition Flight via Quadratic Programming

Energy-Efficient Incremental Control Allocation for Transit...

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International Conference on Guidance, Navigation and Control, ICGNC 2022

作者： Lu, Zhidong Li, Hangxu He, Ruichen Holzapfel, Florian Institute of Flight System Dynamics Technische Universität München Garching85748 Germany School of Transportation Science and Engineering Beihang University Beijing100191 China

ISBN: (纸本)9789811966125

The transition flight of VTOL (vertical take-off and landing) aircraft is generally energy-consuming. This paper proposes an energy-efficient incremental control allocation method for transition flight control. To minimize energy consumption in the time increment, a secondary objective is incorporated into the total cost function when implementing control allocation. This energy increment is equated to the power increment and is estimated using its sensitivities to all control inputs. The final control allocation problem comes in the form of quadratic programming and is efficiently solved by a warm-start active set algorithm. This energy-efficient allocation is embedded in the INDI controller to control the trajectory of a VTOL model. Its performance is compared to open-loop optimal control results and the performance achieved with the weighted least square (WLS) and the redistributed pseudoinverse (RPI) methods. Results show that the INDI controller with the energy-efficient control allocation effectively reduces energy consumption while maintaining accurate trajectory tracking. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Quadratic programming

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