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Heat Transfer Optimization of end Winding Rotor Generator by the Use of Modified Axial Spacer: A Case Study

Journal of Physics: Conference Series 2021年第1期1845卷

作者： Y Baskoro I Jaya A Glowacz M Sulowicz W Caesarendra PT Indonesia Power Indonesia Department of Automatic Control and Robotics AGH University of Science and Technology 30-059 Kraków Poland Institute of Electromechanical Energy Conversion Faculty of Electrical and Computer Engineering Cracow University of Technology Warszawska 24 31-155 Cracow Poland Faculty of Integrated Technologies Universiti Brunei Darussalam Jalan Tungku Link Gadong BE1410 Brunei Darussalam

This paper presents a case study of a rotor fault occurring in the rotor generator of a steam power plant located in Lontar, Banten Province, Indonesia. The steam power plant has 3 x 315 MV capacity and uses hydrogen in the cooling system. The issue arising during the operation was caused by heat transfer exceeding the normal level. The grounding of the rotor occurred through rising vibration and temperature, tripping the generator unit. During repairs, the axial spacer was replaced with a new model, where it is longer than the original, adding a bar spacer at a previously unavailable position and creating a cooling track profile. This is a case study on the replacement of the axial spacer model aimed at preventing the expansion of the winding, so as not to touch with each other, through the installation of a longer axial spacer and the addition of the spacer bar, and lastly adding the track profile to the cooling hydrogen gas flow thereby maximizing the cooling process from the end winding rotor generator. Heat transfer is an analysed parameter related to the model change of the axial spacer. The addition of a track cooling gas flow has been able to maximize the heat transfer process, which is simulated in this paper. The performance of the rotor generator increased through several parameters after the replacement of the axial spacer model.

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Sequential Linear Quadratic Optimal control for Nonlinear Switched Systems

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IFAC-PapersOnLine 2017年第1期50卷 1463-1469页

作者： Farshidian F. Kamgarpour M. Pardo D. Buchli J. Agile and Dexterous Robotics Lab ETH Zürich Switzerland Automatic Control Laboratory ETH Zürich Switzerland

In this contribution, we introduce an efficient method for solving the optimal control problem for an unconstrained nonlinear switched system with an arbitrary cost function. We assume that the sequence of the switching modes are given but the switching time in between consecutive modes remains to be optimized. The proposed method uses a two-stage approach as introduced by Xu and Antsaklis (2004) where the original optimal control problem is transcribed into an equivalent problem parametrized by the switching times and the optimal control policy is obtained based on the solution of a two-point boundary value differential equation. The main contribution of this paper is to use a Sequential Linear Quadratic approach to synthesize the optimal controller instead of solving a boundary value problem. The proposed method is numerically more efficient and scales very well to the high dimensional problems. In order to evaluate its performance, we use two numerical examples as benchmarks to compare against the baseline algorithm. In the third numerical example, we apply the proposed algorithm to the Center of Mass control problem in a quadruped robot locomotion task. © 2017

关键词： control control design for hybrid systems Mobile robots Optimal control of hybrid systems Optimal control theory Real-time control Riccati equations Switching stability

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Efficient trajectory reshaping in a dynamic environment

Efficient trajectory reshaping in a dynamic environment

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International Workshop on Advanced Motion control (AMC)

作者： Martin Biel Mikael Norrlöf Dept. of Automatic Control Royal Institute of Technology Stockholm Sweden Robotics and Motion Division ABB AB Västerås Sweden

A general trajectory planner for optimal control problems is presented and applied to a robot system. The approach is based on timed elastic bands and nonlinear model predictive control. By exploiting the sparsity in the underlying optimization problems the computational effort can be significantly reduced, resulting in a real-time capable planner. In addition, a localization based switching strategy is employed to enforce convergence and stability. The planning procedure is illustrated in a robotics application using a realistic SCARA type robot.

关键词： Trajectory Planning Optimization Robots Real-time systems Convergence System dynamics

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Reinforcement Learning for 4-Finger-Gripper Manipulation

Reinforcement Learning for 4-Finger-Gripper Manipulation

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IEEE International Conference on robotics and Automation

作者： Marco Ojer de Andres M. Mahdi Ghazaei Ardakani Anders Robertsson Mahdi Ghazaei is with the Department of Advanced Robotics (ADVR) Italian Institute of Technology (IIT) Anders Robertsson is with the Department of Automatic Control Lund University Lund Sweden

In the framework of robotics, Reinforcement Learning (RL) deals with the learning of a task by the robot itself. This paper presents a hierarchical-planning approach in which the robot learns the optimal behavior for different levels in a decoupled way. For high-level discrete actions, Q-learning was chosen, whereas for the low level we utilize Policy Improvement with Path Integrals (PI~2) algorithm to learn the parameters of policies, represented by rhythmic Dynamic Movement Primitives (DMPs). The paper studies the case of a 4-finger-gripper manipulator, which performs the task of continuously spinning a ball around a desired axis. The results demonstrate the efficacy of the hierarchical planning and the increased performance of the task when PI~2 is used in conjunction with rhythmic DMPs in a real environment.

关键词： Robots Trajectory Task analysis Planning Heuristic algorithms Learning (artificial intelligence) Approximation algorithms

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On-body non-invasive glucose monitoring sensor based on high figure of merit (FoM) surface plasmonic microwave resonator

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Scientific reports 2023年第1期13卷 17527页

作者： Farzad Soltanian Mehdi Nosrati Saleh Mobayen Chuan-Chun Li Telung Pan Ming-Ta Ke Paweł Skruch Department of Electrical Engineering University of Alberta Edmonton Canada. Department of Electrical Engineering Manhattan College New York USA. Department of Electrical Engineering University of Zanjan Zanjan Iran. mobayens@yuntech.edu.tw. Graduate School of Intelligent Data Science National Yunlin University of Science and Technology Douliou 640301 Yunlin Taiwan. mobayens@yuntech.edu.tw. National Taiwan University Hospital Yunlin Branch Yunlin Taiwan. a***@***. Bachelor Program in Interdisciplinary Studies College of Future National Yunlin University of Science and Technology Yunlin 64002 Taiwan. Graduate School of Intelligent Data Science National Yunlin University of Science and Technology Douliou 640301 Yunlin Taiwan. Department of Automatic Control and Robotics AGH University of Science and Technology 30-059 Kraków Poland.

High-figure of merit (FoM) plasmonic microwave resonator is researched as a non-invasive on-body sensor to monitor the human body's blood glucose variation rate in adults for biomedical applications, e.g., diabetic patients. The resonance frequencies of the proposed sensor are measured to be around [Formula: see text] GHz and [Formula: see text] GHz over the frequency band of DC to 6GHz which are suitable for monitoring interstitial fluid (ISF) changing rate. The [Formula: see text] sensor is experimentally wrapped on the human body arm to monitor the blood glucose changing rate via amplitude and frequency variations of the sensor. Amplitude variation and frequency shift are measured to be around 7 dB and 30 MHz, respectively. The measured results demonstrate the high precision of the proposed approach to depict a valid diagram for glucose changing rate due to good impedance matching of the designed microwave sensor and human body. The sensor is shown to enhance the sensitivity by a factor of 5 compared to the conventional ones.

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Distributed online linear regression

arXiv

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arXiv 2019年

作者： Yuan, Deming Proutiere, Alexandre Shi, Guodong Research School of Engineering Australian National University CanberraACT0200 Australia School of Automation Nanjing University of Science and Technology Nanjing210094 China Department of Automatic Control KTH Royal Institute of Technology Stockholm100-44 Sweden Australian Center for Field Robotics School of Aerospace Mechanical and Mechatronic Engineering University of Sydney SydneyNSW2006 Australia

We study online linear regression problems in a distributed setting, where the data is spread over a network. In each round, each network node proposes a linear predictor, with the objective of fitting the network-wide data. It then updates its predictor for the next round according to the received local feedback and information received from neighboring nodes. The predictions made at a given node are assessed through the notion of regret, defined as the difference between their cumulative networkwide square errors and those of the best off-line network-wide linear predictor. Various scenarios are investigated, depending on the nature of the local feedback (full information or bandit feedback), on the set of available predictors (the decision set), and the way data is generated (by an oblivious or adaptive adversary). We propose simple and natural distributed regression algorithms, involving, at each node and in each round, a local gradient descent step and a communication and averaging step where nodes aim at aligning their predictors to those of their neighbors. We establish regret upper bounds typically in O(T 3/4) when the decision set is unbounded and in O(√T) in case of bounded decision set. Copyright © 2019, The Authors. All rights reserved.

关键词： Gradient methods

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Economic scheduling of a hybrid microgrid based on weather forecasts

Economic scheduling of a hybrid microgrid based on weather f...

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2017 International Conference on Advanced Systems and Electric Technologies, IC_ASET 2017

作者： Bouaicha, Hamadi Dallagi, Habib Craparo, Emily Nejim, Samir Automatic Control and Marine Robotics Naval Academy Tunisia Department of Operations Research Naval Postgraduate School United States

ISBN: (纸本)9781509066346

Intermittency of renewable resources represents a major impediment that restricts their integration in microgrids. This paper presents an approach that can contribute to solve this issue by the prediction of near-Term future renewable power production, mainly wind power and photovoltaic power, based on weather forecasts. After knowing the future renewable power production, the electric grid manager needs to find the optimal operating plan in order to efficiently integrate the predicted renewable production and to optimally operate other controllable components of the microgrid such as fuel-based generators, energy storage units and connectors to the commercial electric grid. We formulate this optimization problem as an integer linear program and exercise the model to study a number of practical issues surrounding microgrids. © 2017 IEEE.

关键词： Scheduling

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The three-measurable problem change of coordinates functions of floater suspended in acoustic environment 17

The three-measurable problem change of coordinates functions...

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17th Conference on Applied Mathematics, APLIMAT 2018

作者： Korobiichuk, Igor Karachun, Volodimir Mel'nick, Viktorij Asaftei, Olena Szewczyk, Roman Institute of Automatic Control and Robotics Warsaw University of Technology Boboli 8 Warsaw02-525 Poland National Technical University of Ukraine Igor Sikorsky Kyiv Polytechnic Institute 37 Avenue Peremogy Kyiv03056 Ukraine Industrial Research Institute for Automation and Measurements PIAP Jerozolimskie 202 Warsaw02-486 Poland

ISBN: (纸本)9788022747653

The constructed analytical model of elastic-stressed state of a floated gyroscope gimbal. Clarified the pattern of elastic displacement of the gyroscope gimbal under the action of the penetrating acoustic radiation. Analyzed the possibility of manifestation of local features. The obtained values of the coordinate functions of the floated gyroscope gimbal provide the possibility of manifestation, in the operating conditions, of the effect of selectivity of the angular motion of an aircraft, components of acoustic vibration of its surface in the form of the formation of a systematic measurement error. © 2018 Slovak University of Technology in Bratislava. All rights reserved.

关键词： Gyroscopes

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Heat distribution in the deep drawing device components working by high temperatures 10

Heat distribution in the deep drawing device components work...

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10th International Conference Machine and Industrial Design in Mechanical Engineering, KOD 2018

作者： Tropp, M. Brumerčík, F. Šteininger, J. Weis, P. Glowacz, A. Univerzity of Žilina Faculty of Mechanical Engineering Department of Design and Mechanical Elements Univerzitná 1 Žilina010 26 Slovakia AGHUniversity of Science and Technology Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering Department of Automatic Control and Robotics Al. A. Mickiewicza 30 Kraków30-059 Poland

The subject of the article is a simulation of heat affected components of a device for deep drawing by extreme conditions in vacuum by high temperatures required for forming of crystallization containers made from thin molybdenum sheets. The simulation is focused on the distribution of heat in particular components in relation with their shape. There are presented the design of working components and the boundary conditions of transient thermal simulations with the results. © 2018 Institute of Physics Publishing. All rights reserved.

关键词： Deep drawing

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Orbital and physical parameters of eclipsing binaries from the ASAS catalogue - XII. A sample of systems with K2 photometry

arXiv

引用

arXiv 2021年

作者： Helminiak, Krzysztof G. Moharana, A. Pawar, T. Ukita, N. Sybilski, P. Espinoza, N. Kambe, E. Ratajczak, M. Jordán, A. Maehara, H. Brahm, R. Kozlowski, S.K. Konacki, M. Nicolaus Copernicus Astronomical Center Polish Academy of Sciences ul. Rabiańska 8 Toruń87-100 Poland Okayama Astrophysical Observatory National Astronomical Observatory of Japan 3037-5 Honjo KamogataOkayama Asakuchi719-0232 Japan Graduate University for Advanced Studies 2-21-1 OsawaMitaka Tokyo181-8588 Japan Space Telescope Science Institute 3700 San Martin Dr. BaltimoreMD21218 United States Subaru Telescope National Astronomical Observatory of Japan 650 North Aohoku Place HiloHI96720 United States Warsaw University Astronomical Observatory Al. Ujazdowskie 4 Warszawa00-478 Poland Facultad de Ingeniería y Ciencias Universidad Adolfo Ibáñez Av. Diagonal las Torres 2640 Peñalolén Santiago Chile Millennium Institute for Astrophysics Santiago Chile Institute of Automatic Control and Robotics Poznań University of Technology Piotrowo 3A Poznań61-131 Poland

We present results of the analysis of light and radial velocity (RV) curves of eight detached eclipsing binaries observed by the All-Sky Automated Survey, which we have followed up with high-resolution spectroscopy, and were later observed by the Kepler satellite as part of the K2 mission. The RV measurements came from spectra obtained with OAO-188/HIDES, MPG-2.2m/FEROS, SMARTS 1.5m/CHIRON, Euler/CORALIE, ESO-3.6m/HARPS, and OHP-1.93/ELODIE instruments. The K2 time-series photometry was analysed with the jktebop code, with out-of-eclipse modulations of different origin taken into account. Individual component spectra were retrieved with the fd3 code, and analysed with the code ispec in order to determine effective temperatures and metallicities. Absolute values of masses, radii, and other stellar parameters are calculated, as well as ages, found through isochrone fitting. For five systems such analysis has been done for the first time. The presented sample consists of a variety of stars, from low-mass dwarfs, through G and F-type Main Sequence objects, to evolved active sub-giants, one of which is found to be crossing the Hertzsprung gap. One target may contain a γ Dor-type pulsator, two more are parts of higher-order multiples, and spectra of their tertiaries were also retrieved and used to constrain the properties of these systems. © 2021, CC BY-NC-SA.

关键词： Photometry

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