304 research outputs found

    Updating structural wind turbine blade models via invertible neural networks

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    Wind turbine rotor blades are huge and complex composite structures that are exposed to exceptionally high loads, both extreme and fatigue loads. These can result in damages causing severe downtimes or repair costs. It is thus of utmost importance that the blades are carefully designed, including uncertainty analyses in order to produce safe, reliable, and cost-efficient wind turbines. An accurate reliability assessment should already start during the design and manufacturing phases. Recent developments in digitalization give rise to the concept of a digital twin, which replicates a product and its properties into a digital environment. Model updating is a technique, which helps to adapt the digital twin according to the measured characteristics of the real structure. Current model updating techniques are most often based on heuristic optimization algorithms, which are computationally expensive, can only deal with a relatively small parameter space, or do not estimate the uncertainty of the computed results. This thesis’ objective is to present a computationally efficient model updating method that recovers parameter deviation. This method is able to consider uncertainties and a high fidelity degree of the rotor blade model. A validated, fully parameterized model generator is used to perform a physics-informed training of a conditional invertible neural network. This network finally represents a surrogate of the inverse physical model, which then can be used to recover model parameters based on the structural responses of the blade. All presented generic model updating applications show excellent results, predicting the a posteriori distribution of the significant model parameters accurately.Bundesministerium für Wirtschaft und Klimaschutz/Energietechnologien (BMWi)/0324032C, 0324335B/E

    STAB-Jahresbericht 2023 - Proceedings of the 21st STAB-Workshop 2023 in Göttingen

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    Die STAB-Jahresberichte werden als Sammlung der Kurzfassungen der Vorträge an die Teilnehmer der abwechselnd stattfindenden Symposien und Workshops verteilt. So erscheint der vorliegende STAB-Jahresbericht 2023 anlässlich des 21. STAB-Workshops, der am 7. und 8. November 2023 in Göttingen stattfinden wird. Der Bericht enthält 77 Mitteilungen über Arbeiten aus den Fachgruppen, die auf dem Workshop vorgestellt werden. Den Mitteilungen ist ein Inhaltsverzeichnis (Seite 14 bis Seite 19) vorangestellt, das nach Fachgruppen gegliedert ist. Innerhalb der Fachgruppen sind die Beiträge alphabetisch nach Autoren geordnet. Die Beiträge verteilen sich (bezogen auf die Erstautoren) zu 4 % auf die Industrie, zu 39 % auf Hochschulen und zu 57 % auf Forschungseinrichtungen (DLR, DNW, ISL). Die Autoren und Koautoren dieses Berichts sind auf den Seiten 174 und 175 aufgeführt

    University of Windsor Undergraduate Calendar 2023 Spring

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    https://scholar.uwindsor.ca/universitywindsorundergraduatecalendars/1023/thumbnail.jp

    Mars delivery service - development of the electro-mechanical systems of the Sample Fetch Rover for the Mars Sample Return Campaign

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    This thesis describes the development of the Sample Fetch Rover (SFR), studied for Mars Sample Return (MSR), an international campaign carried out in cooperation between the National Aeronautics and Space Administration (NASA) and the European Space Agency (ESA). The focus of this document is the design of the electro-mechanical systems of the rover. After placing this work into the general context of robotic planetary exploration and summarising the state of the art for what concerns Mars rovers, the architecture of the Mars Sample Return Campaign is presented. A complete overview of the current SFR architecture is provided, touching upon all the main subsystems of the spacecraft. For each area, it is discussed what are the design drivers, the chosen solutions and whether they use heritage technology (in particular from the ExoMars Rover) or new developments. This research focuses on two topics of particular interest, due to their relevance for the mission and the novelty of their design: locomotion and sample acquisition, which are discussed in depth. The early SFR locomotion concepts are summarised, covering the initial trade-offs and discarded designs for higher traverse performance. Once a consolidated architecture was reached, the locomotion subsystem was developed further, defining the details of the suspension, actuators, deployment mechanisms and wheels. This technology is presented here in detail, including some key analysis and test results that support the design and demonstrate how it responds to the mission requirements. Another major electro-mechanical system developed as part of this work is the one dedicated to sample tube acquisition. The concept of operations of this machinery was defined to be robust against the unknown conditions that characterise the mission. The design process led to a highly automated robotic system which is described here in its main components: vision system, robotic arm and tube storage

    University of Windsor Undergraduate Calendar 2023 Winter

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    https://scholar.uwindsor.ca/universitywindsorundergraduatecalendars/1020/thumbnail.jp

    The ring vortex complex flow phantom: characterisation, optimisation and expansion

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    The field of cardiovascular diagnostic imaging is rapidly evolving, with emerging state-of-the-art medical flow visualisation technologies demonstrating superior quantitative abilities. These techniques require rigorous QA through flow phantoms which generate well-characterised and challenging flows, a requirement not met by current flow test objects. The ring vortex complex flow phantom is a prototype device designed and manufactured in previous work, intended to challenge and assess these next-generation technologies and enable comparison between modalities. The ultrasound-compatible phantom generates ring vortices over a range of Reynolds numbers. These vortices were previously visualised using Laser-PIV and noted for their reproducibility at the macro-scale. This work strove to continue the development of this device, by optimising the device, characterising its functionality (both in device and flow) and expanding its modality compatibility. Achieving these objectives would produce a pre-commercial device compatible with both US and MRI, where high confidence is held in its capabilities. Firstly, the phantom vortices were characterised at the micro-scale, with stability of 80% and reproducibility of 10% found for a range of generating conditions. These thresholds established the levels to which this device and its flows can perform. A QA tool was manufactured to ensure these behaviours were met, with device and flow behaviour tracked in real-time to heighten confidence in correct functionality. The device was optimised to ensure efficient and consistent behaviour, through refinement of the device components and flow generating conditions. Phantom vortices were then further characterised in the context of analytical models, with vortices found to behave according to the Kaplanski-Rudi viscous vortex ring model. Updated experimental visualisation was performed on the optimised phantom version, with the vortices found to retain their high stability and reproducibility, and low stroke-ratio rings acting according to Kaplanski-Rudi. This consistent agreement established Kaplanski-Rudi model as a useful tool for analytical ground-truth datasets for flow characterisation. With the ultrasound-compatible phantom suitable for more widespread use, its restriction to US modalities was addressed, and an MRI-compatible version was manufactured. High stability and reproducibility were observed at the macro-scale, and micro-scale analysis revealed Kaplanski-Rudi behaviour despite the significant design change. This proved the consistency of vortex behaviour over a wide range of generating conditions, and its robustness to design changes. This project significantly improved confidence in the ring vortex phantom, through characterising its vortices’ behaviour (experimentally and analytically), demonstrating device functionality in real-time, and retaining its abilities through a significant re-design for MRI application. The ring vortex phantom is now equipped for the final pre-commercial stage, where widespread imaging through clinical and pre-clinical technologies will demonstrate its usefulness and potential

    University of Windsor Undergraduate Calendar 2022 Winter

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    https://scholar.uwindsor.ca/universitywindsorundergraduatecalendars/1017/thumbnail.jp

    Visual and Camera Sensors

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    This book includes 13 papers published in Special Issue ("Visual and Camera Sensors") of the journal Sensors. The goal of this Special Issue was to invite high-quality, state-of-the-art research papers dealing with challenging issues in visual and camera sensors
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