Spelling suggestions: "subject:"mechanical""
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Untersuchung von Resonanzproblemen am MEYRA E-Rollstuhl 9506 CompactStegemann, Patrick 12 May 2011 (has links)
Der Vortrag zeigt die einzelnen notwendigen Schritte auf, die zur Lösung des Resonanzproblems an der Vorderradaufhängung eines E-Rollstuhls der Firma MEYRA-ORTOPEDIA notwendig waren. Alle Lösungsschritte wurden mit Creo Elements/Pro und seinen Modulen Mechanism Design Option (MDO) und Advanced Mechanica erarbeitet.
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Simulation von Lagern - Vergleiche -Reul, Stefan 11 May 2009 (has links) (PDF)
- Allgemeine Problematik bei der FEM-Simulation von Lagern/Gelenken
- Modellierungstechniken in MECHANICA wie z.B. Kontakt-Analysen, Balkenspinnen, gewichtete Verbindungen, orthotropes Material, etc.
- Vergleich dieser Techniken und Diskussion der Vor- und Nachteile anhand eines Gleitlagers
- Empfehlungen und Regeln
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Entwurf und Auslegung eines neuen nichtlinearen Antriebskonzeptes mittels Creo™ Elements/Pro™Denninger, Daniel, Berger, Maik, Heine, Andreas 12 May 2011 (has links) (PDF)
- ganzheitliche Getriebeauslegung mit Hilfe von Mathcad, Creo™ Elements/Pro™ und MOCAD
- Konkretisierung der Problemstellung beim Rundflechten und Ableiten von Bewegungsanforderungen an die Getriebestruktur
- Strukturauswahl und Synthese mit Motion-Skelett in Creo™ Elements/Pro™ und Mathcad
- MOCAD - MOtion and CAm-Design ist ein universell einsetzbares Werkzeug zum Bewegungsdesign und zur Auslegung von Kurvengetrieben
- MOCAD wird zur Bearbeitung von Forschungs- und Industrieprojekten eingesetzt und mit Kooperationspartnern weiterentwickelt
- Integrierte FEM-Analyse von Getriebestrukturen und Einzelteilen
- Test des neuen Mechanica Features "Gelenkverbindungen"
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Simulação computacional do comportamento do concreto nas primeiras idades. / Computational modelling of the early age concrete\'s behaviour.Aurich, Mauren 15 December 2008 (has links)
O estudo do comportamento do concreto nas primeiras idades está se tornando cada vez mais importante, pois os efeitos térmicos e de retração do concreto, neste período inicial, geram fissuras, aumentando a permeabilidade das estruturas e podendo induzir problemas de durabilidade e funcionalidade das mesmas. Um detalhado estudo da evolução das tensões durante as primeiras idades pode ser decisivo para manter baixos os níveis de fissuração. Neste trabalho foi implementado um modelo computacional, baseado no método dos elementos finitos, para a simulação do comportamento de peças de concreto nas primeiras idades, tendo, em especial, o propósito de avaliar o potencial risco de fissuração. A análise por elementos finitos abrange a modelagem computacional dos fenômenos químicos, térmicos, de difusão de umidade e mecânicos que ocorrem nos primeiros dias após o lançamento do concreto. Na análise química é determinado o calor gerado pelas reações exotérmicas de hidratação do cimento. Na análise térmica o programa considera ainda o fluxo de calor devido à diferença de temperatura entre o corpo e o ambiente. Em função das propriedades térmicas e geométricas do corpo em estudo são determinadas as temperaturas nodais. Na seqüência, realiza-se a análise de difusão de umidade. Aproveitando a semelhança entre as equações que regem os fenômenos de transferência de calor e difusão de umidade, empregam-se os mesmos procedimentos da análise térmica para a determinação do valor nodal da umidade relativa dos poros. Na análise mecânica, por sua vez, são calculados os estados de tensões decorrentes das variações de temperatura e umidade determinadas nas etapas anteriores e dos fenômenos de retração e fluência do concreto. Quando o estado de tensão de determinado ponto de integração atinge a superfície de ruptura, o ponto passa a ser considerado fissurado. O programa considera a fissuração através de um modelo de fissuras distribuídas com fisssura fixa. Os resultados desta modelagem computacional foram comparados com valores experimentais encontrados na literatura, demonstrando excelente aproximação em todas as etapas de solução implementadas. / The study of the early age properties of concrete is becoming more important, because the thermal effects and the shrinkage, even in the first hours, could generate cracks, increasing the permeability of the structure and being able to induce problems of durability and functionality. The detailed study of the stresses development during the construction process can be decisive to keep low the cracking levels. In this work a computational model, based on the finite element method was implemented, to simulate the early age concrete behavior, having as a special feature, the evaluation of the cracking risk. The finite element analysis encloses the computational modeling of the following phenomena: chemical, thermal, diffusion and mechanical which occur at the first days after the concrete cast. In the chemical analysis, the heat generated by the exothermic reactions of cement hydration is evaluated. In the thermal analysis the program still considers the heat flow due to differences in temperatures between the body and the environment. Considering the thermal and geometric properties of the body, the nodal temperatures are determined. The following analysis is the humidity diffusion. Using the similarity between the equations that describe the phenomena of heat transfer and humidity diffusion, the same thermal analysis procedures are used to evaluate the pore relative humiditys nodal values. In the last analysis, mechanical, the stress states due to temperature and humidity variations, evaluated in the previous steps, and also due to shrinkage and creep are calculated. When the stress state in a determined sample point reaches the rupture surface, the point is considered cracked. The program evaluates cracking through a smeared fixed crack model. The developed software results were compared with experimental values found in the literature, demonstrating an excellent agreement for all the implemented analysis.
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FEM- analys av standardräls BJV50 : Undersökning av belastningsfall vid vägning av malmvagn UID IISvensson, Erik, Viitala, Tero January 2007 (has links)
Då godsvagnar skall vägas med trådtöjningsgivare monterade i järnvägsräls finns ett antal faktorer som inverkar på mätresultatet. Denna rapport utreder genom datorbaserade simuleringar hur underlag och hastighet inverkar på töjningen i rälsen och även i viss mån hur deformationen i rälsen påverkas. Vidare utreds hur störningar i form av temperaturförändring samt förändring av kontaktkraften mellan vagnshjul och räls inverkar på töjningen. Förändringen av kontaktkraften kan exempelvis bero på hjulplatta, vibrationer från godsvagn eller ojämnheter i rälsen. / When goods wagons are weighed out with a strain gage assembled to a rail there are certain factors that affect the results of the measurement. This report investigates by computer based simulations how the foundation and the speed of a wagon affect the strain and the deformation of a rail. Furthermore, in the report investigations are made how disturbances in the form of changes in temperature and changes of the contact force between the wheel of a wagon and the rail affect strain. The changes can occur due to non-round wheels, vibrations of a wagon or irregular rail.
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Simulationsgestützte Beurteilung der Dauerfestigkeit einer Förderschnecke für die Pellet-Dosiereinrichtung eines BlockheizkraftwerkesLegat, Philipp 22 May 2012 (has links) (PDF)
Ermüdungsanalyse mit Pro/Mechanica am Beispiel einer Förderschnecke
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Top - Down Design eines universellen Kegelrollenlagermodells in Pro/MECHANICAKloninger, Paul 12 May 2011 (has links) (PDF)
In dieser Präsentation wird das universelle FE-Modell eines Kegelrollenlagers vorgestellt. Mittels eines Pro/ENGINEER-Layouts, basierend auf dem Top-Down Designkonzept, kann automatisch innerhalb einer kurzen Bearbeitungszeit ein geprüftes und lauffähiges FE-Modell eines Kegelrollenlagers abgeleitet werden. Dieses Modell kann z.B. in großen Getriebemodellen eingebaut werden, um eine quasistatische Betrachtung mit korrekten Lagersteifigkeiten zu ermöglichen.
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Jet milling from a particle perspective predicting particle fracture based on mechanical material properties /Vegt, Onno Martinus de, January 2007 (has links)
Proefschr. Rijksuniversiteit Groningen. / Met lit. opg.-Met samenvatting in het Nederlands.
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FEM- analys av standardräls BJV50 : Undersökning av belastningsfall vid vägning av malmvagn UID IISvensson, Erik, Viitala, Tero January 2007 (has links)
<p>Då godsvagnar skall vägas med trådtöjningsgivare monterade i järnvägsräls finns ett antal faktorer som inverkar på mätresultatet. Denna rapport utreder genom datorbaserade simuleringar hur underlag och hastighet inverkar på töjningen i rälsen och även i viss mån hur deformationen i rälsen påverkas. Vidare utreds hur störningar i form av temperaturförändring samt förändring av kontaktkraften mellan vagnshjul och räls inverkar på töjningen. Förändringen av kontaktkraften kan exempelvis bero på hjulplatta, vibrationer från godsvagn eller ojämnheter i rälsen.</p> / <p>When goods wagons are weighed out with a strain gage assembled to a rail there are certain factors that affect the results of the measurement. This report investigates by computer based simulations how the foundation and the speed of a wagon affect the strain and the deformation of a rail. Furthermore, in the report investigations are made how disturbances in the form of changes in temperature and changes of the contact force between the wheel of a wagon and the rail affect strain. The changes can occur due to non-round wheels, vibrations of a wagon or irregular rail.</p>
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Obtencao do cermet Ni-ZrOsub(2) por moagem de alta energia / Cermet Ni-ZrO2 by mechanical alloyingLEITE, DOUGLAS W. 09 October 2014 (has links)
Made available in DSpace on 2014-10-09T12:27:20Z (GMT). No. of bitstreams: 0 / Made available in DSpace on 2014-10-09T13:59:14Z (GMT). No. of bitstreams: 0 / Dissertacao (Mestrado) / IPEN/D / Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
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