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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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Cloud-assisted nonlinear model predictive control for finite-duration tasks

arXiv

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arXiv 2021年

作者： Li, Nan Zhang, Kaixiang Li, Zhaojian Srivastava, Vaibhav Yin, Xiang The Department of Aerospace Engineering University of Michigan Ann ArborMI48109 United States The Department of Mechanical Engineering Michigan State University East LansingMI48824 United States The Department of Electrical and Computer Engineering Michigan State University East LansingMI48824 United States The Department of Automation Key Laboratory of System Control and Information Processing Shanghai Jiao Tong University Shanghai 200240 China

Cloud computing creates new possibilities for control applications by offering powerful computation and storage capabilities. In this paper, we propose a novel cloud-assisted model predictive control (MPC) framework in which we systematically fuse a cloud MPC that uses a high-fidelity nonlinear model but is subject to communication delays with a local MPC that exploits simplified dynamics (due to limited computation) but has timely feedback. Unlike traditional cloud-based control that treats the cloud as powerful, remote, and sole controller in a networked-system control setting, the proposed framework aims at seamlessly integrating the two controllers for enhanced performance. In particular, we formalize the fusion problem for finite-duration tasks by explicitly considering model mismatches and errors due to request-response communication delays. We analyze stability-like properties of the proposed cloud-assisted MPC framework and establish approaches to robustly handling constraints within this framework in spite of plant-model mismatch and disturbances. A fusion scheme is then developed to enhance control performance while satisfying stability-like conditions, the efficacy of which is demonstrated with multiple simulation examples, including an automotive control example to show its industrial application potentials. Copyright © 2021, The Authors. All rights reserved.

关键词： Model predictive control

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Mathematical Models and Algorithms for Forecasting National Security in Training Situational Centers

Mathematical Models and Algorithms for Forecasting National ...

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International Conference on Management of Large-Scale system Development (MLSD)

作者： Natalya Yandybaeva Alexander Rezchikov Evgeny Gorschkov Alexey Bogomolov Vadim Kuschnikov Balakovo branch of the Russian Academy of National Economy and Administration under the President of the Russia Balakovo Russia Laboratory no.33 V. A. Trapeznikov Institute of Control Sciences of RAS Moscow Russia Laboratory of system problems of control and automation in mechanical engineering Institute of Precision Mechanics and Control Russian Academy of Sciences Saratov Russia Yuri Gagarin State Technical University Saratov Scientific Center RAS Saratov Russia

ISBN: (数字)9781728110943

ISBN: (纸本)9781728110950

A mathematical model is presented, developed based on a system dynamics model, for carrying out an express analysis of the state and forecasting the national security of states. An algorithm for using the developed mathematical support in assessing the state of national security of states is presented. The method of training specialists in the field of national security in training situational centers is shown.

关键词： Training system dynamics Heuristic algorithms Predictive models Mathematical model National security Forecasting

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Output Feedback control for MIMO systems with Disturbances Compensation

Output Feedback Control for MIMO systems with Disturbances C...

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European control Conference (ECC)

作者： D.E. Konovalov S.A. Vrazhevsky I.B. Furtat A.S. Kremlev Martin Cech Faculty of Control Systems and Robotics ITMO University St. Petersburg Russia The Laboratory ”Control of Complex System” Institute for Problems in Mechanical Engineering of the Russian Academy of Sciences (IPME RAS) St. Petersburg Russia Pilsen — NTIS - European Center of Excellence University of West Bohemia

ISBN: (数字)9783907144022

ISBN: (纸本)9781728188133

The paper deals with the novel feedback output control law for multiple-input multiple-output (MIMO) plant with mismatched bounded disturbances. The plant model is described by linear and Lipshitz nonlinear terms. The control law is based on the auxiliary loop method for disturbance estimation and modified backstepping method for control under mismatched disturbances. Differently from existing results based on backstepping method the proposed algorithm allows to reduce the accuracy in steady state, while the existing auxiliary loop based algorithm are feasible under matched disturbances. The results in the England Power system Benchmark illustrate the efficiency of the proposed scheme.

关键词： Backstepping Steady-state control systems Mathematical model Attenuation MIMO communication Estimation

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Development of Sheet Palletizing Manipulator Based on Multi-link Mechanism

Research Square

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Research Square 2020年

作者： Chen, Zhihua Wang, Shoukun Liu, Quan Wang, Junzheng Key Laboratory of Intelligent Control and Decision of Complex Systems School of Automation Beijing Institute of Technology Beijing100081 China Key Laboratory of Servo Motion System Drive and Control Ministry of Industry and Information Technology School of Automation Beijing Institute of Technology Beijing100081 China New Energy Laboratory College of Mechanical and Electrical Engineering Beijing Information Science and Technology University Beijing100192 China

In view of the disadvantages of Traditional tandem joint type thin-plate palletizing robots using push-down adsorption sorting, such as moving path complexity, large occupied space, joint error stack and low end control precision, a novel multi-link mechanism thin-plate palletizing robot is developed. The kinematics analysis is carried out based on the analysis of the overall structure for the manipulator, a genetic algorithm based on the stroke speed ratio K, the transmission angle γ and the four-bar size is proposed to realize the optimal design of the four-link rocker arm mechanism. Secondly, a finite element based overall structure analysis method is proposed, which obtains the most affected part of the vibration process of a manipulator and performs load verification to prevent early warning and reference of faults caused by mechanical resonance. To solve the control problem of nonlinear strongly coupled dynamic systems, an iterative learning fuzzy adaptive control algorithm is proposed to achieve the smooth running of the manipulator and the high-precision tracking of the end centroid trajectory. The experimental results verify the feasibility and effectiveness of the proposed multi-link controllable thin-plate palletizing manipulator's overall structural design and iterative learning control method, which is well applied in practical engineering. © 2020, CC BY.

关键词： Manipulators

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Study on the Dynamic Characteristics of Subway Tunnel Billboard Under Wind and Vibration Loads

Research Square

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Research Square 2020年

作者： Sun, Yong-Hang Luo, Zhong Wang, Yu Wei, Kai Han, Gui-Xin School of Mechanical Engineering & Automation Northeastern University Shenyang110819 China China Key Laboratory of Vibration and Control Aero-Propulsion System Ministry of Education Northeastern University Shenyang110819 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian116024 China

In order to avoid the damage of billboards in the subway tunnel, the dynamic characteristic of them subjected to the wind load, the train-induced vibration load and both of them (multi-load) were analyzed. First, computational fluid dynamics (CFD) was used to simulate unsteady airflow when a train runs in tunnel. Second, the train-induced vibration load is obtained by the fitting formula. Finally, a finite element model of Shenyang Metro was built and the response of the billboard under different loads were obtained. The result shows that the structural response of the billboard under multi-load is severer than each single load. For the wind load, it has a greater influence on the equivalent stress of the billboard, while for the vibration load, it has a greater influence on the acceleration of the billboard. The response under multiple loads includes the characteristics of two loads acting separately. This study reveals the dynamic characteristic of billboards under different loads, which will help to improve the stability and safety life of them. © 2020, CC BY.

关键词： Computational fluid dynamics

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Balancing method without trial weights for rotor systems based on similitude scale model

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Frontiers of mechanical engineering 2018年第4期13卷 571-580页

作者： Ruiduo YE Liping WANG Xiaojie HOU Zhong LUO Qingkai HAN School of Mechanical Engineering and Automation Northeastern University Shenyang 110819 China Key Laboratory of Vibration and Control of Aero-Propulsion System Ministry of Education Northeastern University Shenyang 110819 China School of Mechanical Engineering Dalian University of TechnologyDalian 116000 China

A balancing method without trial weights based on the dynamic similitude scale model was proposed as a solution to the balancing problem of a large-scale rotor system. This method could be used to directly obtain the required coefficients for the balancing problem of the prototype system through a similarity model test without a prototype test. Thus, the weight test process of the prototype system was effectively eliminated in the proposed balancing method. First, with the rotor system as the research object, the analytical expression of the influence coefficient was derived on the basis of rotor dynamics theory. Then, through calculation and dimen- sional analysis methods, the similitude relationships of the rotor system and the influence coefficient were deduced on the basis of dynamic similitude theory. The correctness of the proposed similitude relationships was verified through numerical simulation and experiment. The balancing method without trial weights was proposed based on the similitude relationship of the influence coefficient. The effect of the balancing method without trial weights was compared with that of the traditional influence coefficient method through numerical simulation, and the results verified the correctness and effectiveness of the proposed balancing method. The results of this study provide theoretical supplements for the balancing method and the similitude design of the rotor system.

关键词： rotor system dynamic similitude balancing,without trial weights influence coefficient

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Digital Quadruplets for Cyber-Physical-Social systems based Parallel Driving: From Concept to Applications

arXiv

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arXiv 2020年

作者： Liu, Teng Yang, Xing Wang, Hong Tang, Xiaolin Chen, Long Yu, Huilong Wang, Fei-Yue State Key Laboratory of Mechanical Transmissions College of Automotive Engineering Chongqing University Chongqing400044 China Department of Mechanical and Aerospace Engineering Nanyang Technological University Singapore School of Vehicle and Mobility Tsinghua University Beijing China Waytous Inc. Qingdao Shandong266109 China Department of Mechanical and Mechatronics Engineering University of Waterloo N2L 3G1 Canada State Key Laboratory for Management and Control of Complex System Institute of Automation Beijing China

Digital quadruplets aiming to improve road safety, traffic efficiency and driving cooperation for future connected automated vehicles are proposed with the enlightenment of ACP based parallel driving. The ACP method denotes Artificial societies, Computational experiments and Parallel execution modules for cyber-physical-social systems. Four agents are designed in the framework of digital quadruplets: descriptive vehicles, predictive vehicles, prescriptive vehicles and real vehicles. The three virtual vehicles (descriptive, predictive, and prescriptive) dynamically interact with the real one in order to enhance the safety and performance of the real vehicle. The details of the three virtual vehicles in the digital quadruplets are described. Then, the interactions between the virtual and real vehicles are presented. The experimental results of the digital quadruplets demonstrate the effectiveness of the proposed framework. Copyright © 2020, The Authors. All rights reserved.

关键词： Vehicles

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