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5th International Conference on Cognitive systems and Signal Processing, ICCSIP 2020

作者： Zhuang, Hanyang Wang, Chunxiang Qian, Yuhan Yang, Ming University of Michigan-Shanghai Jiao Tong University Joint Institute Shanghai Jiao Tong University Shanghai200240 China Guangxi Key Laboratory of Automobile Components and Vehicle Technology Guangxi University of Science and Technology Liuzhou545006 China Department of Automation Shanghai Jiao Tong University Shanghai200240 China Key Laboratory of System Control and Information Processing Ministry of Education of China Shanghai200240 China School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China

ISBN: (纸本)9789811623356

The development of autonomous driving technology proposes higher requirements of the fidelity of the high-definition maps (HD maps). The construction of HD map based on orthophotos generated from panoramic images is the state-of-the-art approach. However, in this process, the dynamic obstacles and shadows on the road captured by the panoramic camera has significant impact on reducing the map quality. Moreover, the GNSS signal may inevitably unavailable or have jitter error, leading to the unsatisfactory of the orthophoto mosaic. Therefore, an approach is proposed to tackle these problems of HD map construction. The semantic segmentation of the panoramic images is firstly implemented to extract the dynamic obstacles such as vehicles and the road segments. Then the shadows on the road segments are removed through GAN networks to generate clean orthophotos. Afterwards, the clean orthophotos are used for feature extraction and image registration based on the road segmentation to provide finer pose estimations. Finally, the GNSS data, odometer data, and estimated poses are combined to optimize the vehicle pose for orthophoto mosaic. The experimental results illustrate that the proposed approach can improve the HD map construction accuracy under the congested environment. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Image registration

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Real-time trajectory generation for quadrotors using B-spline based non-uniform kinodynamic search

Real-time trajectory generation for quadrotors using B-splin...

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2019 IEEE International Conference on Robotics and Biomimetics, ROBIO 2019

作者： Tang, Lvbang Wang, Hesheng Li, Peng Wang, Yong Department of Automation Shanghai Jiao Tong University Key Laboratory of System Control and Information Processing Ministry of Education of China China School of Mechanical Engineering and Automation China Beijing Institute of Control Engineering China

ISBN: (纸本)9781728163215

In this paper, we propose a time-efficient approach to generate safe, smooth and dynamically feasible trajectories for quadrotors in the obstacle-cluttered environment. By using the uniform B-spline to represent trajectories, we transform the trajectory planning to a graph-search problem of B-spline control points in discretized space. Highly strict convex hull property of B-spline is derived to guarantee the dynamical feasibility of the entire trajectory. A novel non-uniform kino-dynamic search strategy is adopted, and the step length is dynamically adjusted during the search process according to the Euclidean signed distance field (ESDF), making the trajectory achieve reasonable time-allocation and be away from obstacles. Non-static initial and goal states are allowed, therefore it can be used for online local re-planning as well as global planning. Extensive simulation and hardware experiments show that our method achieves higher performance compared with the state-of-the-art method. © 2019 IEEE.

关键词： Trajectories

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A New Method of Fault Detection and Diagnosis for the Tennessee Eastman Process

A New Method of Fault Detection and Diagnosis for the Tennes...

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第32届中国过程控制会议(CPCC2021)

作者： Pengbin Zhang Tao Zou Jingyang Wang Zhijia Yang State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Key Laboratory of Networked Control System Chinese Academy of Sciences Shenyang China. Institutes for Robotics and Intelligent ManufacturingChinese Academy of Sciences University of Chinese Academy of Sciences College of Mechanical and Electrical Engineering Guangzhou University State Key Laboratory of Robotics Shenyang Institute of AutomationChinese Academy of Sciences Key Laboratory of Networked Control System Chinese Academy of Sciences Institutes for Robotics and Intelligent Manufacturing Chinese Academy of Sciences State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences

This paper proposes a new fault detection and diagnosis(FDD) method for the Tennessee Eastman(TE) large-scale chemical *** method is built integrated with a curve-type recognizer and a dynamic Bayesian network(DBN).The fault detection is carried out utilizing the curve-type recognizer,while the diagnosis is completed using the ***,the recognizer extracts fault symptoms from different times by distinguishes the curves' ***,the DBN is constructed to handle these time-related fault symptoms *** DBN will give the probability of each fault more and more accurately as time goes *** whole procedure consists of 1) deciding monitoring variables using chemical and control engineering knowledge 2) extracting fault symptoms,3) building a *** advantage over other data-driven FDD methods in reasonability and interpretability is also *** last,the simulation results demonstrate the availability of the proposed method.

关键词： A New Method of Fault Detection and Diagnosis for the Tennessee Eastman Process

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On Nash-Stackelberg-Nash Games under Decision-Dependent Uncertainties: Model and Equilibrium

arXiv

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arXiv 2022年

作者： Zhang, Yunfan Liu, Feng Wang, Zhaojian Chen, Yue Feng, Shuanglei Wu, Qiuwei Hou, Yunhe State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing China MOE Key Laboratory of System Control and Information Processing Department of Automation Shanghai Jiao Tong University Shanghai China Department of Mechanical and Automation Engineering The Chinese University of Hong Kong Hong Kong Hong Kong Renewable Energy Research Center China Electric Power Research Institute Beijing China Center for Electric Power and Energy Department of Electrical Engineering Technical University of Denmark Kgs. Lyngby Denmark Shenzhen Institute of Research and Innovation The University of Hong Kong Hong Kong

In this paper, we discuss a class of two-stage hierarchical games with multiple leaders and followers, which is called Nash-Stackelberg-Nash (N-S-N) games. Particularly, we consider N-S-N games under decision-dependent uncertainties (DDUs). DDUs refer to the uncertainties that are affected by the strategies of decision-makers and have been rarely addressed in game equilibrium analysis. In this paper, we first formulate the N-S-N games with DDUs of complete ignorance, where the interactions between the players and DDUs are characterized by uncertainty sets that depend parametrically on the players’ strategies. Then, a rigorous definition for the equilibrium of the game is established by consolidating generalized Nash equilibrium and Pareto-Nash equilibrium. Afterward, we prove the existence of the equilibrium of N-S-N games under DDUs by applying Kakutani’s fixed-point theorem. Finally, an illustrative example is provided to show the impact of DDUs on the equilibrium of N-S-N games. Copyright © 2022, The Authors. All rights reserved.

关键词： Game theory

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Dynamic Characteristics of Ball Bearing-Coupling-Rotor system with Angular Misalignment Fault

Research Square

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Research Square 2021年

作者： Wang, Pengfei Xu, Hongyang Yang, Yang Ma, Hui He, Duo Zhao, Xiang School of Mechanical Engineering and Automation Northeastern University Liaoning Shenyang110819 China China North Vehicle Research Institute Beijing100072 China Key Laboratory of Vibration Control of Aero-Propulsion System Ministry of Education Northeastern University Liaoning Shenyang110819 China

The rotor misalignment fault, which occurs only second to unbalance, easily occurs in the practical rotating machinery system. Rotor misalignment can be further divided into coupling misalignment and bearing misalignment. However, most of the existing references only analyze the effect of coupling misalignment on the dynamic characteristics of the rotor system, and ignore the change of bearing excitation caused by misalignment. Based on the above limitations, a five degrees of freedom nonlinear restoring force mathematical model is proposed, considering misalignment of bearing rings and clearance of cage pockets. The finite element model of the rotor is established based on the Timoshenko beam element theory. The coupling misalignment excitation force and rotor unbalance force are introduced. Finally, the dynamic model of the ball bearing-coupling-rotor system is established. The radial and axial vibration responses of the system under misalignment fault are analyzed by simulation. The results show that the bearing misalignment significantly influences the dynamic characteristics of the system in the low-speed range, so bearing misalignment should not be ignored in modeling. With the increase of rotating speed, rotor unbalance and coupling misalignment have a greater impact. Misalignment causes periodic changes in bearing contact angle, radial clearance, and ball rotational speed. It also leads to reciprocating impact and collision between the ball and cage. In addition, misalignment increases the critical speed and the axial vibration of the system. The results can provide a basis for health monitoring and misalignment fault diagnosis of the rolling bearing-rotor system. © 2021, CC BY.

关键词： Rotating machinery

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SIF calculation of car body based on sub-model method 25

SIF calculation of car body based on sub-model method

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25th ISSAT International Conference on Reliability and Quality in Design, RQD 2019

作者： Zhang, Ruijin Wei, Shaodong Zhao, Shuo Tang, Haichao Key Laboratory of Vibration and Control of Aero-Propulsion System of Ministry of Education Northeastern University Shenyang China School of Mechanical Engineering and Automation Northeastern University Shenyang China School of Mechanical Engineering and Automation Northeastern University Shenyang China School of Mechanical Engineering and Automation Northeastern University Shenyang China

ISBN: (纸本)9780991057672

- The accurate and efficient calculation of stress intensity factor (SIF) is necessary for damage tolerance design and safety assessment of engineering structures. According to the structural characteristics of car body, the simulation method of SIF calculation was firstly studied based on a simple plate structure respectively submitted to planar deformation and spatial bending deformation. The results showed that the shell element model could be used in SIFs calculation with a high accuracy in planar deformation state, and the shell-solid element coupling model should be used in spatial bending deformation state. Then, the sub-model method was applied in the fracture mechanics analysis of the side wall door column of car body with different crack lengths of assuming crack. The SIF simulation results by using the sub-model method were compared with the ones by using the whole car body model. It can be concluded that the sub-model method not only had a better accuracy in fracture mechanics simulation, but also greatly increased the computation efficiency for a complex structure. © 2019 International Society of Science and Applied Technologies. All rights reserved.

关键词： Cracks

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Corrigendum to "Investigation on the distribution mechanism of coupling mode frequencies of a blisk system" [Mech. Syst. Signal Process. 218 (2024) 111549] (mechanical systems and Signal Processing (2024) 218, (S0888327024004473), (10.1016/***.2024.111549))

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mechanical systems and Signal Processing 2025年 231卷

作者： She, Houxin Li, Chaofeng Zhang, Haoyan Xia, Xin Zang, Chaoping College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Jiangsu Province Key Laboratory of Aerospace Power System Nanjing210016 China School of Mechanical Engineering & Automation Northeastern University Liaoning Shenyang110819 China Key Laboratory of Vibration and Control of Aero-Propulsion Systems Ministry of Education of China Northeastern University Liaoning Shenyang110819 China

The authors regret that the last grant number in the funding acknowledgment was incorrectly stated. The correct funding information needs to be modified as follows: Original Funding Acknowledgment: The Science Center for Gas Turbine Project (P2022-A-III-002-001) Corrected Funding Acknowledgment: The Science Center for Gas Turbine Project (P2023-B-Ⅲ-001-001) The authors would like to apologise for any inconvenience caused. © 2025 Elsevier Ltd

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Simulation of Fatigue Crack Propagation Process after Overload Based on Cohesive Zone Model

Simulation of Fatigue Crack Propagation Process after Overlo...

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2019 International Conference on Quality, Reliability, Risk, Maintenance, and Safety engineering, QR2MSE 2019

作者： Zhang, Ruijin Hu, Binbin Xu, Lida Cao, Bin Northeastern University Key Laboratory of Vibration and Control of Aero-Propulsion System of Ministry of Education Shenyang110819 China Northeastern University School of Mechanical Engineering and Automation Shenyang110819 China

ISBN: (纸本)9781728114279

Fatigue failure due to varying load is one of the main failure modes in engineering. A large plastic deformation due to accidental tensile overload around the crack tip has a significant effect on the fatigue crack propagation. In order to simulate the crack propagation process, the Cohesive Zone Model (CZM) based on elastoplastic mechanics was studied to take into account the plastic deformation. Based on the bilinear cohesive constitutive model and experimental data, two parameters including cohesive fracture energy and material strength were determined. By comparing Digital Image Correlation (DIC) experiment results with simulation results, it was concluded that both the normal quasi-static model and the cohesion model had a good coincidence with the test data when the plastic area around the tip of crack was small. For a larger plastic zone around the crack tip, the cohesive model method was obviously better than the quasi-static model. © 2019 IEEE.

关键词： Finite element method

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Observer-based finite time H ∞ control of nonlinear discrete time-varying systems with an adaptive event-triggered Mechanism

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Journal of the Franklin Institute 2020年第16期357卷 11668-11689页

作者： Menghua Chen Hamid Reza Karimi Jian Sun School of Automation Beijing Institute of Technology Beijing 100081 China Department of Mechanical Engineering Politecnico di Milano Milan 20156 Italy Key Laboratory of Intelligent Control and Decision of Complex System Beijing Institute of Technology Beijing 100081 China

The problem of finite time stability and synthesis is discussed for nonlinear discrete time-varying systems by using the T-S fuzzy model. To reduce the communication network resources, two adaptive event-triggered mechanisms (AETMs) are taken into consideration in sensor-to-observer (S/O) and observer-to-controller (O/C) channels. The thresholds of the AETMs are adjusted according to the estimation error rather than some fixed ones. Sufficient conditions for developing an observer-based time-varying control are obtained, which ensure the time-varying error system to be finite time stable and satisfy the H ∞ performance simultaneously. Moreover, using the singular value decomposition technique, recursive linear matrix inequalities conditions are obtained for computing the gains of the controller and observer. Finally, the superiority and applicability of the proposed method are demonstrated by examples.

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Fatigue fixture design and structure simulation analysis for side beams of high-speed train 25

Fatigue fixture design and structure simulation analysis for...

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25th ISSAT International Conference on Reliability and Quality in Design, RQD 2019

作者： Qian, Wenxue Song, Shuai Zhang, Ying Yin, Xiaowei Xie, Liyang School of Mechanical Engineering and Automation Northeastern University Shenyang110819 China School of Mechanical Shenyang Institute of Engineering Shenyang110136 China Key Laboratory of Vibration and Control of Aero-Propulsion System of Ministry of Education Northeastern University Shenyang110819 China

ISBN: (纸本)9780991057672

- High-speed train side beam structure mainly has the task of hanging various equipments. A train will bear the action of random vibration and impact load during the process of traveling. The side beam structure will cause fatigue damage under the action of the external alternating load. For fatigue analysis of high-speed train side beam structure, the three-dimensional model of the side beam structural was firstly built using SolidWorks and imported into the workbench for material setting and finite element modeling. The stress distribution and max stress were obtained through FEA. According to the standard load spectrum and the S-N curve of the material, the fatigue life simulation analysis of structural was carried. After that several fatigue tests of the structural components were carried out to test the fatigue of the side beam structures to verify and correct the finite element analysis results. On this basis, the fatigue life evaluation of the entire side beam structure was performed in combination with the measured load spectrum. It provides a necessary basis for the life assessment of the train body structure. © 2019 International Society of Science and Applied Technologies. All rights reserved.

关键词： Finite element method

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