Дисертації з теми "Thermal parameters identification"
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Urukalo, Djordje. "Thermal parameters identification and internal temperature bservation of DC actuators in robotics." Versailles-St Quentin en Yvelines, 2014. http://www.theses.fr/2014VERS0057.
Повний текст джерелаOne of the objectives of this work is to implement fatigue prevention of electrical motors inside a humanoid robot. We aim to design the most simplified lumped thermal models for DC actuators with low-level control that can be used for motor protection to avoid too much warming and destruction of windings. The research conducted in this thesis is mainly centered on determination of thermal model parameters and influence on the thermal model parameters of a shelling actuator on real actuator benches. Two different identification processes are taken into account: invasive and non-invasive identification that can be implemented onsite in real time. Transmission efficiency determination of a specific actuator for two different scenarios is done, where is taken into account influence of angular velocity and actuator shelling. Fatigue implementation of prevention for electrical motors inside a humanoid robot is proposed in this work. The two types of observers for inner (rotor) temperature observation is conducted: rotor temperature observers with known and unknown input. Known input observer is Luenberger observer where observer gain is properly tuned and temperature dependence on rotor wire resistance is taken into account. Work on unknown input rotor temperature observer is of great importance in humanoid robotics, because there are many unmeasurable quantities. In complex system such as humanoid robots, computing time and price has to be reduced. In order to satisfy these conditions, unknown input observer is desirable to be used. Applications in humanoid robots are conducted in the thesis. In order to validate our work, NAO robot is used
Dupuis, Quentin. "Identification des caractéristiques d'une carte électronique et de ses composants, et modélisation de leurs comportements thermiques." Electronic Thesis or Diss., Paris 10, 2023. http://www.theses.fr/2023PA100131.
Повний текст джерелаThe work presented in this thesis is a contribution to the identification via experimental measurements of critical parameters for the thermal modelling of an electronic board and its components.First, the study of the temporal evolution of the junction temperature of an electronic component stimulated by a constant thermal power is proposed, based on the graphical analysis of its Cumulative Structure Function. All the steps involved in the construction of this function are presented in detail, together with an analysis of the various sensitive parameters. Absolute identification of the thermal parameters of the different materials of an electronic component is not feasible, but a relative study is presented to enable the calibration of its detailed numerical model.The second part of this thesis is devoted to the identification, using inverse methods, of the characteristics of a component embedded in an electronic board, namely its position, its dimensions, and its dissipated thermal power. To achieve this objective, a 3D numerical model based on the finite volume method was implemented to calculate the transient conductive heat transfer within the structure of study. The conjugate gradient algorithm with adjoint variable calculation is used to estimate the dissipated heat power density, while its coupling with a one-dimensional minimisation function permits to identify the position of the heat sources according to the depth of the structure. The application of this procedure to data from numerical simulations and experimental measurements has enabled to validate the inversion method
Madrid, Lozano Francesc. "Thermal Conductivity and Specific Heat Measurements for Power Electronics Packaging Materials. Effective Thermal Conductivity Steady State and Transient Thermal Parameter Identification Methods." Doctoral thesis, Universitat Autònoma de Barcelona, 2005. http://hdl.handle.net/10803/5348.
Повний текст джерелаPhoenix, Austin Allen. "High Precision Thermal Morphing of the Smart Anisogrid Structure for Space-Based Applications." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/78824.
Повний текст джерелаPh. D.
Andres, Matthias [Verfasser], and René [Akademischer Betreuer] Pinnau. "Improving thermal ablation of liver tumors: Modeling and parameter identification of laser-induced interstitial thermotherapy / Matthias Andres ; Betreuer: René Pinnau." Kaiserslautern : Technische Universität Kaiserslautern, 2021. http://d-nb.info/1233986619/34.
Повний текст джерелаZhang, Ying. "Synthesis of Local Thermo-Physical Models Using Genetic Programming." Scholar Commons, 2009. https://scholarcommons.usf.edu/etd/103.
Повний текст джерелаCasetta, Damien. "Modèle d'aide à la conduite de réseaux de froid." Thesis, Paris Sciences et Lettres (ComUE), 2017. http://www.theses.fr/2017PSLEM012.
Повний текст джерелаCooling demand management of commercial buildings can contribute to limit global warming below 2°C. District cooling is an energy-efficient option. However, improving operational performance is of great importance to ensure and increase its competitive advantages. The aim of this thesis is to contribute to the development of a decision-support tool for daily operation of district cooling networks. Challenges lie at two levels: diversity of decisions to be taken and complexity of physical phenomena involved. The original aspect of our work is to propose a methodology to improve chillers and cooling towers control, differential pressure management and dispatching between production plants with variable efficiency. Our developments are applied to the district cooling of Paris-Bercy, operated by Climespace. First; a model featuring a physical description of chilled-water production plants, distribution network and buildings substations, is developed. In particular, a semi-empirical model with identified parameters is modified to compute non-nominal characteristics of centrifugal chillers. The system model is validated against an independent dataset. Then, the model is used to find optimized controls from cooling loads forecast. The proposed methodology is sequential: pre-computation of optimal set-points at plant level and then generation of quadratic plant models to solve the dispatching optimization problem at each time step. Differential pressure is minimized with a simulation-based tracking of the critical substation. To conclude, electricity consumption reduction with optimized controls is evaluated during a summer week
Pernot, Gilles. "Identification de propriétés thermiques et spectroscopie térahertz de nanostructures par thermoréflectance pompe-sonde asynchrone : application à l'étude du transport des phonons dans les super-réseaux." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR13997/document.
Повний текст джерелаThe work presented in this thesis deals with identification and control of the thermal and acoustic properties of high thermoelectric potential nanostructures called “superlattices”. This thesis is divided in three parts: The first part gives a theoretical description of thermal diffusion in insulating and semiconducting materials. We first broach the atomic description then the macroscopic view using the Thermal Quadrupole model. The end of this chapter deals with acoustic and thermal properties specific to superlattices. The second part describes and compares synchronous and asynchronous thermoreflectance techniques used to extract thermal properties of thin films and superlattices. We find that for the synchronous case signals are subject to artifacts which confound parameter estimations. For the asynchronous case, we find that lack of a mechanical translation stage removes these artifacts. We then investigate the sensitivity functions, and finally validate our identification method by estimation of the thermal conductivity of a SiO2 thin film. The third part presents the results of thermal parameter identification in SiGe superlattices. We show that thermal interfaces play a major role to in the overall thermal conductivity. We also study superlattices with Ge nanodots and show that for such structures we are able to obtain thermal conductivity values near the amorphous values. Moreover, the linear behavior of the thermal conductivity with period thickness shows that it is possible to control this value. Finally, we use Thermoreflectance to perform THz coherent phonon spectroscopy of superlattices, revealing the spectral selectivity of these nanostructures
Mondalek, Pamela. "Modélisation numérique du procédé de frittage flash." Phd thesis, Ecole Nationale Supérieure des Mines de Paris, 2012. http://pastel.archives-ouvertes.fr/pastel-00820191.
Повний текст джерелаGroßmann, Knut. "Thermo-Energetische Gestaltung von Werkzeugmaschinen: Modellierung und Simulation: 2. Kolloquium zum SFB/TR 96: 24./25.10.2012 in Chemnitz." Technische Universität Dresden, 2012. https://tud.qucosa.de/id/qucosa%3A28098.
Повний текст джерелаIm Mittelpunkt der 2. Tagung des Sonderforschungsbereichs Transregio 96 „Thermo-energetische Gestaltung von Werkzeugmaschinen standen erste Ergebnisse zur Modellierung und Simulation von Komponenten und Baugruppen von Werkzeugmaschinen im Mittelpunkt. An den drei Standorten Aachen, Chemnitz und Dresden werden unterschiedliche Lösungsansätze für die steuerungsintegrierte Korrektur thermischer bedingter Strukturverformungen in spanenden Werkzeugmaschinen verfolgt. Von diesen wird eine unterschiedliche Wirksamkeit bzw. Eignung für verschiedene Einsatzfälle erwartet. Bevor diese in der Praxis umgesetzt werden können, müssen Fragen zur Beschreibung der Wärmequellen und zur Wärmeübertragung beantwortet werden. Außerdem bedarf die Umsetzung der Konzepte in den CNC-Steuerungen effizienter Verfahren zur Modellierung und Simulation der thermisch bedingten Strukturverformung. Für die Entwicklung und Bewertung der Korrekturverfahren sowie zur Berechnung der notwendigen Achs-Korrekturen ist die Systemsimulation u. a. an einem prozessaktuelle Werkzeugmaschinenabbild erforderlich. Für die Bewertung ihrer Praxisrelevanz werden die Einzellösungen nach und nach in ein betriebswirtschaftlich orientiertes Gesamtmodell integriert.
Großmann, Knut. "Thermo-Energetische Gestaltung von Werkzeugmaschinen: Experimentelle Methodik: 3. Kolloquium zum SFB/TR 96: 29./30.10.2013 in Aachen." Prof. Dr.-Ing. habil. Knut Großmann, 2013. https://tud.qucosa.de/id/qucosa%3A28099.
Повний текст джерелаHuang, Jui-Cheng, and 黃睿政. "Simulation of Rapid Thermal Process Modelling,Parametres Identification and Temperature Control." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/59412070481972156241.
Повний текст джерела國立交通大學
控制工程系
84
An integrated model is given for the components that make up a rapid thermal processing (RTP) system. These components are the lamp power dynamics, ray-tracing model, and the wafer thermal dynamic model. The models for the components are integrated in a numerical code to give a computer simulation of the complete RTP system. The simulation can be used to investigate the interaction of the furnace, lamp contour, and the control system. Of the various techniques for controlling the temperature of the RTP system,model-based control has the greatest potential for attaining the best performance in the field of conventional control, when the model is accurate. In this thesis, some identification methods are introduced to help obtain more accurate models from measured input-output data. At first, identification techniques are presented to estimate the parameters (time constant and gain) of step response. Then show how to use the input-output measurements to obtain a black-box model (autoregressive exogenous mo del) of the RTP system, which turns out to have better prediction capability. The identified models are useful not only to control law design but also to analysis of system characteristics.We apply the tracking system technique that is known in the digital control literature for the model-based control, and propose a controller-switching rule throughout the nonlinear operating region. To overcome ill performance of the tracking system due to the inaccuracy of the identified model, the neural fuzzy network for inverse control is proposed. The key advantage of neural fuzzy approach over traditional ones lies on that the approach doesn't require a mathematical description of the system while controlling. The neural fuzzy network that we use is the Self-cOnstructing Neural Fuzzy Inference Network (SONFIN) proposed by Junag and Lin. Temperature control involves maintaining a spatially uniform temperature distribution across the wafer while tracking a temp orally varying temperature trajectory such as a rapid ramp to processing temperatures. The combination of lamp added RTP system and the MIMO SONFIN is shown to be able to track a temporally varying temperature trajectory and maintain the uniformity of the spatial temperature distribution simultaneously.
Erfurt. "Identifikation von Waermeaustauschparametern Thermischer Netzwerke durch transient gemessene Knotentemperaturen bei minimierter Messzeit." Phd thesis, 2001. http://edocs.tu-berlin.de/diss/2001/biering_bernd.pdf.
Повний текст джерелаBaasch, Gaby. "Identification of thermal building properties using gray box and deep learning methods." Thesis, 2020. http://hdl.handle.net/1828/12585.
Повний текст джерелаGraduate
"Thermo-Energetische Gestaltung von Werkzeugmaschinen: Modellierung und Simulation." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-143929.
Повний текст джерелаIm Mittelpunkt der 2. Tagung des Sonderforschungsbereichs Transregio 96 „Thermo-energetische Gestaltung von Werkzeugmaschinen standen erste Ergebnisse zur Modellierung und Simulation von Komponenten und Baugruppen von Werkzeugmaschinen im Mittelpunkt. An den drei Standorten Aachen, Chemnitz und Dresden werden unterschiedliche Lösungsansätze für die steuerungsintegrierte Korrektur thermischer bedingter Strukturverformungen in spanenden Werkzeugmaschinen verfolgt. Von diesen wird eine unterschiedliche Wirksamkeit bzw. Eignung für verschiedene Einsatzfälle erwartet. Bevor diese in der Praxis umgesetzt werden können, müssen Fragen zur Beschreibung der Wärmequellen und zur Wärmeübertragung beantwortet werden. Außerdem bedarf die Umsetzung der Konzepte in den CNC-Steuerungen effizienter Verfahren zur Modellierung und Simulation der thermisch bedingten Strukturverformung. Für die Entwicklung und Bewertung der Korrekturverfahren sowie zur Berechnung der notwendigen Achs-Korrekturen ist die Systemsimulation u. a. an einem prozessaktuelle Werkzeugmaschinenabbild erforderlich. Für die Bewertung ihrer Praxisrelevanz werden die Einzellösungen nach und nach in ein betriebswirtschaftlich orientiertes Gesamtmodell integriert
"Thermo-Energetische Gestaltung von Werkzeugmaschinen: Modellierung und Simulation." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-212144.
Повний текст джерела"Thermo-Energetische Gestaltung von Werkzeugmaschinen: Experimentelle Methodik." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-143947.
Повний текст джерела"Thermo-Energetische Gestaltung von Werkzeugmaschinen." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-85961.
Повний текст джерела