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Methods of Parametric modeling and simulation Numerical Analysis of Rotor Dynamics in Active Magnetic Bearings on Example of the Turbocompressor

Methods of Parametric Modeling and Simulation Numerical Anal...

引用

international Scientific and Technical conference on Integrated computer Technologies in Mechanical Engineering - Synergetic Engineering (ICTM)

作者： Kuchma, Mykhailo Martynenko, Gennadii Natl Tech Univ Kharkiv Polytech Inst 2 Kyrpychova St UA-61002 Kharkiv Ukraine

ISBN: (纸本)9783031614149;9783031614156

The article includes the comparison of two methods of modeling and evaluating the dynamics of rotors in active magnetic bearings (AMBs). An analysis of the dynamics of the rotor of the turbocompressor of the gas-pumping unit is considered, taking into account AMBs which are used as systems for control of motion stability. Two different methods of modeling were used to simulate the rotor dynamics of the rotor-AMBs system: the first is solid modeling which takes into account the deformability of the hinged elements of the rotor and its effect on its natural frequencies and critical speeds and the second is mass modeling where all hinged elements are replaced by mass-inertial elements. Both approaches are based on the application of finite element methods. The work aims to identify the advantages and disadvantages of using different methods for modeling and calculating rotordynamics characteristics of rotors supported by AMBs. The identification is based on various static and dynamic analyses. The results of numerical experiments are presented in the form of calculations of critical speeds and modes of oscillation (precession). This makes it possible to judge the possibility of the resonance regimes of the system and prevent dangerous situations. Obtained results indicate the accuracy and adequacy of results generated using different methods. The results could be used to determine the applicability of certain approaches depending on the specific needs of an engineer or researcher.

关键词： Turbocompressor Rotor Dynamics Analysis Active Magnetic Bearing Package for General Technical Engineering Analysis

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Research on Structural Model Optimization simulation of Magnetic Bearing Based on Deep Learning

Research on Structural Model Optimization Simulation of Magn...

引用

2023 international conference on computer simulation and modeling, Information Security, CSMIS 2023

作者： Li, Yongbin Zhou, Mingjia Chen, Bo Sun, Yan Harbin Huade University Heilongjiang Harbin150025 China

ISBN: (纸本)9798350343724

At present, in the industrial application of AMB (active magnetic bearing), most of the design methods are to linearize the magnetic bearing model near the working point, and then design the traditional PID controller. But it is difficult to adjust the parameters of such a controller. In this paper, the structural model optimization method of magnetic bearing based on deep learning is established, and the fully connected neural network structure is constructed based on the idea of deep neural network and BPNN (BP neural network). According to the running state of the system, the parameters of PID controller are adjusted, and the output of neural network corresponds to the parameters of PID controller under the optimal control theory through self-learning of neural network and adjustment of weighting coefficient. The simulation results show that after starting the drag motor, under the control of AMB, the rotor moves approximately in a circle around the center of mass, and the maximum displacement is only in the order of tens of microns, which is less than 240um of the protective bearing clearance. The test results show that the established optimization process of magnetic bearing structure improves the design efficiency and provides an effective reference method for the structural optimization design of magnetic bearing. © 2023 IEEE.

关键词： Magnetic bearings

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A modeling and simulation of ReRAM with Nonidealities for System-Level PIM Validation in System Verilog

A Modeling and Simulation of ReRAM with Nonidealities for Sy...

引用

2023 IEEE international conference on Consumer Electronics-Asia, ICCE-Asia 2023

作者： Jeong, Ingu Park, Jun-Eun Sungkyunkwan University Department of Electrical and Computer Engineering Suwon Korea Republic of

ISBN: (纸本)9798350344318

This paper presents an efficient modeling approach of resistive random-access memory (ReRAM) for fast system-level validation of ReRAM-based processing-in-memory (PIM). The proposed of ReRAM model is implemented with XMODEL primitives in SystemVerilog, providing compatibility with Verilog models of PIM architecture. Various nonidealities of ReRAM are realized in the proposed model such as resistance states, switching voltages, and dynamic current fluctuation. Hence, ReRAM-based PIMs can be modeled and validated in more accurate and efficient way with the proposed ReRAM model. Compared with previous Verilog-A modeling approaches, the proposed modeling achieves about 95% simulation time reduction in 64 ReRAM cell array. © 2023 IEEE.

关键词： RRAM

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Design and simulation of hydraulic self-driven flood control gate based on ANSYS 8

Design and simulation of hydraulic self-driven flood control...

引用

8th international conference on Electrical, Mechanical and computer Engineering, ICEMCE 2024

作者： Zhao, Shengjie Liu, Danyang Bai, Jiayi Lv, Can Zhou, Chenyang Xi'an Shiyou University Xi'an China

ISBN: (纸本)9798331506230

The traditional gate can not use the natural conditions to achieve flood control function, in the flood comes by relying on human operation, can not carry out timely flood control operation. This paper proposes a hydraulic self-drive flood control gate, which mainly includes hydraulic dynamic drive mechanism and hydraulic drive mechanism. Use SolidWorks 3 D modeling software to establish its 3 D model, with the overall length of 6.5 m, the width of 1.5 m and the height of 4.5 m. And the secondary protection function is realized through the hydraulic drive mechanism. The parameters of the gate are set, and the specific design parameters of the water tank and hydraulic cylinder are obtained through the theoretical analysis of the two mechanisms. Ansys simulation software is used for dynamic analysis and mode analysis, show that the maximum stress of the gate is 8.84 Mpa and the maximum deformation is 0.186 mm, which meets the requirements of gate design strength and stiffness of the gate. Mode analysis simulation results show that the minimum vibration frequency of the gate is 34.588 Hz, greater than the maximum pulse frequency of water flow is 20 Hz, which almost does not resonate with the flood. © 2024 IEEE.

关键词： Flow of water

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Reinforcement Learning for Control of Human Locomotion in simulation 10

Reinforcement Learning for Control of Human Locomotion in Si...

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10th IEEE RAS/EMBS international conference for Biomedical Robotics and Biomechatronics (BioRob)

作者： Dashkovets, Andrii Laschowski, Brokoslaw Ukrainian Catholic Univ Dept Comp Sci Lvov Ukraine Univ Toronto Dept Mech & Ind Engn Toronto ON Canada Toronto Rehabil Inst KITE Res Inst Toronto ON Canada

ISBN: (纸本)9798350386523;9798350386530

Control of robotic leg prostheses and exoskeletons is an open challenge. computer modeling and simulation can be used to study the dynamics and control of human walking and extract principles that can be programmed into robotic legs to behave similar to biological legs. In this study, we present the development of an efficient two-layer Q-learning algorithm, with k-d trees, that operates over continuous action spaces and a reward model that estimates the degree of muscle activation similarity between the agent and human state-to-action pairs and state-to-action sequences. We used a human musculoskeletal model acting in a high-dimensional physics-based simulation environment to train and evaluate our algorithm to simulate biomimetic walking. We used imitation learning and artificial biomechanics data to accelerate training via "expert" demonstrations and used experimental human data to compare and validate our predictive simulations, achieving 79% accuracy. Moreover, when compared to the previous state-of-the-art that used deep deterministic policy gradient, our algorithm was significantly more efficient with lower computational and memory storage requirements (i.e., requiring 7 times less RAM and 87 times less CPU compute), which can benefit real-time embedded computing for robot control. Overall, our new two-layer Q-learning algorithm using sequential data for continuous imitation of human locomotion serves as a first step towards the development of bioinspired controllers for robotic prosthetic legs and exoskeletons. Future work will focus on improving the prediction accuracy compared to experimental data and expanding our simulations to other locomotor activities.

关键词： Exoskeleton (Robotics)

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The Negotiator: Interactive Hostage-Taking Training simulation 14

The Negotiator: Interactive Hostage-Taking Training Simulati...

引用

19th international conference on Software Technologies, ICSOFT 2024

作者： Monaco, Pierre-Benjamin Backlund, Per Gobron, Stéphane Avenue de Provence 7 Lausanne Switzerland Department of Game Technologies School of Computer Science University of Skövde Skövde Sweden Espace de l’Europe 11 Neuchâtel Switzerland

ISBN: (纸本)9789897587061

High-stakes professions like negotiators and pilots utilize simulations for risk-free training, enhancing skills and decision-making. Traditional simulations, while effective, are resource-intensive. computer simulations offer a scalable alternative but lack realism and sensory engagement, impacting immersion. This study explores mobile phones’ role in simulation-based learning, using a 3D hostage-taking scenario to improve immersion through realistic interactions. The simulation integrates a detailed environment and interactive elements, and demonstrate the potential of mobile technology to enhance training in critical fields by making simulations more lifelike and engaging. This paper is presented alongside a twin paper, both part of the same project Master final project. The second paper introduces a different version of the simulation using a Large Language Model (like ChatGPT) for generating dialogue freely and interactively. It also discusses the results of a study comparing immersion levels between the two versions. © 2024 by SCITEPRESS – Science and Technology Publications, Lda.

关键词： Smartphones

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simulation of Hydraulic Control Model of Underwater Manipulator Based on Improved Genetic Algorithm

Simulation of Hydraulic Control Model of Underwater Manipula...

引用

2023 international conference on computer simulation and modeling, Information Security, CSMIS 2023

作者： Zhou, Mingjia Chen, Bo Sun, Yan Li, Yongbin Harbin Huade University Heilongjiang Harbin150025 China

ISBN: (纸本)9798350343724

Underwater manipulator is mainly driven by electric and oil hydraulic pressure, and it is widely used in underwater operation. The control parameters of conventional PID controller are fixed, and the control effect on nonlinear and time-varying systems is poor, so the dynamic response and steady-state accuracy of the system cannot be taken into account. In order to make full use of the dynamic performance of the manipulator, the fuzzy PID controller structure is introduced into the hydraulic control system of the underwater manipulator, and the fuzzy PID control parameters are adjusted by using the improved GA (genetic algorithm). Multi-point parallel operation mechanism is used to find the global optimal solution, and the convergence speed is fast. The mutation operator used for local search is optimized. The simulation results show that the improved GA tuning fuzzy PID control parameters has obvious advantages and faster search speed. The response speed of PID controller based on improved GA is 65.85% higher than that of conventional PID controller. The experimental results verify the feasibility of the hydraulic control model of underwater manipulator based on improved GA, and this method has certain reference significance for complex trajectory planning. © 2023 IEEE.

关键词： Genetic algorithms

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System Dynamics in Manufacturing Processes Modelling and Analysis 1

引用

3rd international conference on Innovation in Engineering, ICIE 2024

作者： Litwin, Pawel Szymusik, Anna Department of Computer Science Faculty of Mechanical Engineering and Aeronautics Rzeszow University of Technology Al. Powstanców Warszawy 8 Rzeszów35-959 Poland

ISBN: (数字)9783031615825

ISBN: (纸本)9783031615818

The systems dynamics (SD) method allows analysis of the performance of complex systems over the full simulation period. It allows for prediction of the dynamics of systems containing many interdependent elements. However, due to the complexity of models, SD is most often used to map systems at an aggregate level with a low level of detail. This paper presents solutions to improve the process of detailed modelling and simulation of manufacturing systems. The integration of SD with value stream mapping (VSM) and the use of pattern models help streamline the modeling process and can contribute to increasing the SD application area in manufacturing process analysis. The case study illustrates the methodology for modeling and simulation and shows how SD can be used to improve the manufacturing process. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.

关键词： System theory

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POLARIS-LC: A Multi-Class traffic Flow Model in Lagrangian Coordinates for Large-Scale simulation 15

POLARIS-LC: A Multi-Class traffic Flow Model in Lagrangian C...

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15th international conference on Ambient Systems, Networks and Technologies Networks, ANT 2024 / The 7th international conference on Emerging Data and Industry 4.0, EDI40 2024

作者： De Souza, Felipe Gurumurthy, Krishna Murthy Verbas, Omer Auld, Joshua Transportation and Power Systems Division Argonne National Laboratory 9700 S Cass Ave LemontIL United States

Agent-based modeling has become increasingly prevalent in transportation systems simulation as the scenarios around new technologies and policies become increasingly complex. This increased complexity, in terms of traveler behavior, traffic flow, modal operations, system management, and so on, requires increasingly sensitive and detailed representation of the core components of the simulation, especially as it relates to traffic flow. Many future mobility solutions rely on connectivity, communication, advanced sensing, and detailed information flows, while the simulation also needs to remain computationally tractable. In this paper, we propose a new Lagrangian Coordinate within the POLARIS Agent-Based-modeling Framework (LC-POLARIS) of traffic flow, which combines computational efficiency while adding microscopic features. This model allows multi-class traffic flow by setting different speed-spacing relationships. In this modeling, automated vehicles have lower reaction time, while light-duty trucks have lower free-flow speed and higher jam spacing. The model captures the reduction in capacity and higher queue spillback because of higher jam spacing of trucks. Also, the model yields higher capacity for both passenger and light duty automated vehicles on expressways. The LC-ABM traffic flow model is validated in Bloomington, IL, USA, in a scenario with different rates of four vehicle types. © 2024 Argonne National Laboratory.

关键词： Trucks

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Research on The Application of American College Classroom Experience Evaluation System Based on computer Virtual Reality Technology

Research on The Application of American College Classroom Ex...

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2022 international conference on Mathematics, modeling, and computer Science, MMCS 2022

作者： Lei, Chenwenxuan Kuai, Xiao Rossier School of Education University of Southern California Los AngelesCA90007 United States Viterbi School of Engineering University of Southern California Los AngelesCA90007 United States

ISBN: (纸本)9781510664593

With the continuous development of computer virtual reality technology, in recent years, Chinese foreign students can learn more knowledge and multi-dimensional and multi-stage online open courses in the process of classroom experience in American universities. The traditional video playing system has been unable to meet the process of new college classroom learning. With the progress of computer virtual reality technology, Many college classroom learning processes can be reconstructed using computer modeling technology, so as to mine the student behavior data available in the teaching management system, and extract the key factors affecting students' academic performance. This computer system uses the method of machine learning virtual reality to analyze the meaning and predict the final score of students' courses. The experimental simulation shows that the system realizes the substantial equivalence of online and offline teaching, and promotes the good development of online teaching. © 2023 SPIE.

关键词： Students

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