1,721,104 research outputs found
Interaction as an Issue in the Development of Effective Tools for the Management of the Engineering Knowledge Base
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Alla scoperta del suolo... presentazione di un ciclo di attività sperimentali per studenti delle scuole secondarie
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Functional geometric characterization of lifting airfoil: An ICP based metrological approach
Full text linkThis paper presents a novel metrological approach for the functional geometric characterization of lifting airfoils, utilizing an Iterative Closest Point (ICP) algorithm to assess deviations in camber, thickness, and form. Traditional geometric specification methods, such as line profile tolerances, often fail to capture the full impact of geometric deviations on airfoil performance. In response, the proposed methodology addresses this limitation by linking airfoil geometry more closely to functional requirements. The new methodology was validated using synthetic datasets and real-world data, demonstrating robustness in the absence of noise and highlighting areas for improvement in noise handling. The findings suggest that the ICP-based method is a valuable tool for airfoil manufacturing, enhancing conformity checks against design specifications. This study opens pathways for more accurate tolerance synthesis and enhanced quality control in the production of lifting airfoils
Arsenic in berries and its correlation with natural soil content: experience in Trentino (Italy)
No full textBridging the gap between design and manufacturing specifications for non-rigid parts using the influence coefficient method
Full text linkThe manufacturing process may lead non-rigid parts to endure large deformations which could be reduced during assembly. The manufacturing specifications of the single parts should refer to their free state or “as manufactured” state; the functional specifications should instead address the “as assembled” state. Therefore, a functional geometrical inspection requires dedicated fixtures to bring the parts in “as assembled” state. In this paper, through a linearized model that considers fixturing and elastic spring-back, we aim to correlate the functional specification to the manufacturing specifications. The model suggests a hybrid approach called “restricted skin model” that allows to reduce the degrees of freedom considering the form error when relevant. Firstly, the framework is verified in a mono-dimensional test case. Subsequently, it is verified including FEM simulation and actual measurement for two simple assemblies. The results show that the model can correctly interpret the theoretical assembly behaviour for actual applications. The use of the “restricted skin model” approach shows a negligible difference when compared to full FEM simulation with differences of 2.1 · 10e−7 mm for traslations and 6.0 · 10e−3 deg for rotations. The comparison with actual measurement values showed an error of ±0.2 mm at the assembly features. Furthermore, the linearized model allows a possible real-time application during production that enables to adjust manufacturing specification limits in case of process drifting
Modellazione del Processo di Progettazione in un Ambiente per la Gestione di Basi di Conoscenza
No full textL'evoluzione di sistemi di supporto alla progettazione realmente innovativi, e in particolare di quelli "knowledge driven", non può prescindere dallo sviluppo di strumenti per la gestione delle basi di conoscenza ingegneristica in grado di integrare le diverse informazioni generate o utilizzate e descrivere i processi attivati dal progettista. In un precedente contributo [1] è stato presentato lo schema generale di uno strumento con tali caratteristiche basato sull'utilizzo di "frame" per la modellazione dei dati. Scopo del presente lavoro è quello di illustrare in che modo sia possibile descrivere mediante la schematizzazione prescelta alcuni tipici processi utilizzati nella comune pratica progettuale come, ad esempio, la derivazione di dati da tabelle, la stima e aggiustamento di parametri, ecc.
Come esemplificazione, si farà riferimento al processo di progettazione di una pompa centrifuga a flusso radiale con pale a semplice curvatura
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