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Ein Beitrag zur Identifikation von dynamischen Strukturmodellen mit Methoden der adaptiven Kalman-Filterung / A. Eichhorn (2005)

Public Titre : Ein Beitrag zur Identifikation von dynamischen Strukturmodellen mit Methoden der adaptiven Kalman-Filterung Titre original : [Une contribution à l'identification des modèles dynamiques de structures avec des méthodes de filtrage adaptatif de Kalman] Type de document : Thèse/HDR Auteurs : A. Eichhorn, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2005 Collection : DGK - C Sous-collection : Dissertationen num. 585 Importance : 124 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5024-2 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes descripteurs IGN] filtre de Kalman [Termes descripteurs IGN] navigation automobile [Termes descripteurs IGN] objet mobile [Termes descripteurs IGN] positionnement cinématique [Termes descripteurs IGN] réseau routier Résumé : (Auteur) Within the field of research " Identification of Dynamic Systems " this dissertation was created at the Institute for Applications of Geodesy to Engineering (University of Stuttgart) and is investigating two different tasks. The first task is related to deformation analysis and contains the development of a temperature deformation model for the close-to-reality prediction / simulation of the effect of one-sided dynamic thermal loads on bar-shaped bodies. This topic is motivied by mechanical engineering searching new methods for the indirect compensation of thermal influences on highly precise machine tools (i.e. robot arms, etc.). In civil engineering the analysis of the thermal bend of slim constructions like towers or pillars under sun exposure is of great interest. The central part of the deformation model is represented by a finite element topology quantifying the non-stationary temperature distribution inside the body. The topology is realized by a system of partial differential equations which base on FOURIERS law of heat flow. The parametric identification of the structural model ('white box'-model) is carried out by means of adaptive KALMAN-filtering. In lab tests with an aluminium column the estimation of thermal diffusivity succeeds with a deviation of only 0,2% of the theoretical value. The calibrated model is verified by independent temperature measurements. It is shown that the deviations between the calculated and the measured temperature distribution are within the 3 u-range of the thermocouples (óT ~ 0,4 K). Consequently the model is suitable for close-to-reality calculations considering a variable spectrum of dynamic thermal loads. The combination with a deformation module enables the prognosis of the columns thermal bend with a relative error of only 3% related to the maximum deformation amplitude. The result fulfills the requirements for indirect compensation methods in industrial manufacturing. The second task contains the parametric identification of a vehicle movement. On behalf of the DaimlerChrysler AG a module for map-independent positioning is developed. The central element of the module is represented by a KALMAN-filter with causative modified kinematic motion equations. The system equations explicitly consider measured changes in orientation whereby the usual inertia of kinematic models is significantly reduced. Testing the positioning module in different scenarios on highways, country roads and in city centres accuracies within a range of Sp ~ 2 ... 3 in are achieved. Numéro de notice : 13273 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54952

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GPS-Anwendungen in der Sportwissenschaft / T. Blumenbach (2005)

Public Titre : GPS-Anwendungen in der Sportwissenschaft : Entwicklung eines Messverfahrens für das Skispringen Titre original : [Emploi du GPS dans la science du sport : développement d'un procédé de mesure pour le saut en ski] Type de document : Thèse/HDR Auteurs : T. Blumenbach, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2005 Collection : DGK - C Sous-collection : Dissertationen num. 591 Importance : 74 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5030-3 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes descripteurs IGN] GPS en mode cinématique [Termes descripteurs IGN] mesurage de phase [Termes descripteurs IGN] phase GPS [Termes descripteurs IGN] positionnement par GPS [Termes descripteurs IGN] précision centimétrique [Termes descripteurs IGN] récepteur GPS [Termes descripteurs IGN] sport Résumé : (Auteur) Carrier phase based GPS applications with centimeter accuracy have become more popular over the last years, not only in surveying. First investigations are accomplished in sports sciences as well. However, most geodetic GPS equipment is too large and too heavy for attaching it at the athletes body. Using the potential of miniaturized electronics, a special GPS receiver for ski jumping was developed. The hardware could be integrated completely into a common jumping helmet. Striving to an ideal measurement system with no influence on the athlete activities only little adverse effects remain on the athletes using the GPS-helmet. The topography of jumping hills results in a more or less shadowing of the GPS satellite signals. Not all jumping hills are applicable for GPS measurements. Measurement campaigns need to be well planned considering satellite constellation issues. Centimeter accuracy requires successful integer ambiguity fixing. Common algorithms assume uninterrupted signal reception over a sufficient long time. But the 10-20 seconds for an attempt, take-off, flight and landing are not long enough. Thus a laser light barrier array was developed. It determines position and time of the GPS-helmet during athletes take-off from the ramp. This information enables the ambiguity fixing and enhances accuracy and reliability of the solution, even for short GPS measurement segments. The system was successfully tested during some training sessions of german ski jumpers. It was shown which informations can be derived from positions and velocities for several phases of a jump. Numéro de notice : 13275 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54954

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Johann Georg von Soldner (1776-1833) und seine Zeit ; Johann von Lamont (1805-1879) / J. Past (2005)

Public Titre : Johann Georg von Soldner (1776-1833) und seine Zeit ; Johann von Lamont (1805-1879) : Lebensweg und wissenschaftliche Leistungen unter besonderer Berücksichtigung seiner Arbeiten zur Erforschung des Erdmagnetfeldes Type de document : Monographie Auteurs : J. Past, Auteur ; H. Soffel, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2005 Collection : BAW Astronomisch-Geodätische Arbeiten, ISSN 0340-7691 num. 62 Importance : 36 p. Format : 21 x 30 cm + cédérom ISBN/ISSN/EAN : 978-3-7696-9624-0 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Histoire des sciences et techniques [Termes descripteurs IGN] champ géomagnétique Numéro de notice : 13457 Affiliation des auteurs : non IGN Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54968

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Modelbasierte Segmentierung und Objekterkennung aus Distanzbildern / Johannes Böhm (2005)

Public Titre : Modelbasierte Segmentierung und Objekterkennung aus Distanzbildern Titre original : [Segmentation basée sur le modèle et reconnaissance d'objet à partir d'images à distance] Type de document : Thèse/HDR Auteurs : Johannes Böhm, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2005 Collection : DGK - C Sous-collection : Dissertationen num. 583 Importance : 94 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5022-8 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes descripteurs IGN] appariement [Termes descripteurs IGN] arbre (mathématique) [Termes descripteurs IGN] données localisées 3D [Termes descripteurs IGN] objet géographique 3D [Termes descripteurs IGN] partitionnement [Termes descripteurs IGN] reconnaissance d'objets [Termes descripteurs IGN] segmentation d'image Résumé : (Auteur) The availability of highly capable three-dimensional sensor systems creates the need for adequate systems for automated processing of three-dimensional data. Contrary to conventional intensity-images, which contain information on the intensity of an objects surface, range images store the distance of each point on a surface to the sensor. In order to process these data on a high level of abstraction, new concepts need to be developed, exceeding two-dimensional image analysis. In the context of developing automated three-dimensional computer vision systems, this thesis brings two aspects into focus: partitioning the image data and establishing a correspondence in-between image- and model-data. This work aims at developing a model-based system for the segmentation and object recognition of three-dimensional objects with curved surfaces using range images. The model data is represented using a CAD-model, providing a mathematical precise and reliable description of arbitrary shapes. Within this thesis a newly developed method for model-based range image segmentation is presented, using curvature as invariant features. By integrating model information into the segmentation stage, the segmentation process is guided to provide a partitioning corresponding to that of the CAD-model. The features extracted during segmentation stage are brought into correspondence with the features of the model using a tree-search strategy. The number of possible pairings is reduced due to the fact that model information has been utilized during segmentation. After successful pairing, the three-dimensional transformation of the model onto the object in the scene is computed, completing the object recognition process. This work provides a way to compute the segmentation of objects in range images containing curved surfaces, detect objects in arbitrary positions and derive the transformation onto a CAD-model. Thereby it contributes to the development of automated systems in the areas of inspection, manufacturing and robotics. Numéro de notice : 13271 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54950

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Modellgestützte Kostenprognose für den Aufbau qualitätsgesicherter Geodatenbestände / M. Stark (2005)

Public Titre : Modellgestützte Kostenprognose für den Aufbau qualitätsgesicherter Geodatenbestände Titre original : [Modèle de pronostic des coûts pour la constitution de bases de données géographiques de qualité] Type de document : Thèse/HDR Auteurs : M. Stark, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2005 Collection : DGK - C Sous-collection : Dissertationen num. 590 Importance : 128 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5029-7 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Infrastructure de données [Termes descripteurs IGN] base de données localisées [Termes descripteurs IGN] coût [Termes descripteurs IGN] qualité des données [Termes descripteurs IGN] qualité totale [Termes descripteurs IGN] stratégie Résumé : (Auteur) Spatial geodatabases are basic condition for many modern traffic management and telematic services. By realising the digital road map and using modern positioning techniques the complex task of target guidance finally took up speed and meets the required maturity for market introduction. These geodatabases are not only indispensable for those services but their realisation and ongoing maintenance work is highly expensive. Data aging by less maintenance, data errors and incomplete databases will cause an increasing loss of acceptance. This errors can also cause additional work and the rising of the resulting costs. Therefore it must be the own interest of an enterprise to get an precise forecast of investment and the resulting costs. Such a forecast plays an important roll to set up a new business model. Regarding aspects of quality a prediction model for the build-up costs of geodatabases is presented in this work. By regarding the intermodal routing planner which had been realised within the official German research project MOBILIST the working tasks and their schedule are shown as well as the resulting costs to built up that intermodal database. With this database the interconnection of the street and railway network had been improved in order to ensure future individual mobility with respect to the increasing flood of traffic. It is shown that the total costs of realisation depends on the tasks of quality management. Costs of quality management can be higher than the total costs of realisation. This motivates the research about the influence of building-up strategies of geodatabases on quality management costs. By integrating the quality aspects in the prediction model it will be able to forecast not only the build-up costs but also identify the cheapest way of error detection and correction. This leads to the possibility to say which build-up strategy with respect to quality requirements is cheaper and better. It is proven by model calculations that it can be reasonable to reject own geodatabases and follow the new build-up strategy to buy a new geodataset and improve it by yourself. Furthermore the threshold value of quality requirements for the decision which way of quality inspection (full inspection or inspection by random sample) is given. With this prediction model of the total costs regarding quality requirements a method was developed to decide which strategy of building up a geodatabase will be useful. It is shown how to transfer this method into other fields of applications on geodatabases. Numéro de notice : 13433 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54965

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Multi-Sensor-Photogrammetrie / Norbert Haala (2005)

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Nicht-lineare Sensitivitätsanalyse gezeigt an Beispielen zu bewegten Objekten / Volker Schwieger (2005)

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Theoreme über Bewegungsintegrale und ihre Anwendung in Bahntheorien / Monique Schneider (2005)

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Wavelettransformation hybrider Geländemodelle / G. Beyer (2005)

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Zur Parametrisierung radialsymmetrischer Dichtemodelle für die Erde / H. Wziontek (2005)

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Atmosphärische und ozeanische Einflüsse auf die Rotation der Erde - Nummerische Untersuchungen mit einem dynamischen Erdsystemmodell / Florian Seitz (2004)

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Automatische Extraktion urbaner Straßennetze aus Luftbildern / Stefan Hinz (2004)

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Das stochastische Modell bei der VLBI-Auswertung / V. Tesmer (2004)

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Effiziente Wavelet Filterung mit hoher Zeit-Frequenz-Auflösung / O. Fabert (2004)

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Ein integritätswahrendes Messsystem für kinematische Anwendungen / W. Stempfhuber (2004)

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