Global ETD Search

331	Autosalon v Olomouci / Car show room in Olomouc Mudrák, Štěpán January 2022 (has links) The subject of this diploma thesis is structural design of a car showroom building in Olomouc. The layout dimensions are 16 x 37 m, the roof is designed as a 5° slope half span roof with cantilever hanging of 6 m. Roof layout dimensions are therefore 22 x 37 m. The object is designed as a two – storey building with two levels of second floor. Maximum height of the structure is about 9,0 m. The design is based on a study of two materiál variants – timber and steel structure. More suitable variant was chosen and following drawings, structural design report and technical report were processed. Main structural system is designed as a one rigid corner column – girder connection, 6 m axis dimensions. Main structural material is a glued laminated timber, completed with coniferous timber and steel elements. The roofing is supported by rafters which are connected to the main roof truss. Bearing element of floors is a Novatop Element structural systém. The spatial rigidity of structure is ensured by steel stiffeners. Structural analysis was carried out by finite element method in software Scia Engineer 21, where the design of the basic elements for ultimate limit state and serviceability limit state was made. Connection design was processed manuály and with software Idea Statica and Hilti Engineering Suite.
332	Deformačně-napěťová analýza aneurysmatu břišní aorty / Stress-Strain Analysis of Abdominal Aortic Aneurysm Ryšavý, Pavel January 2011 (has links) This thesis deals with problems of biomechanics of soft tissues, namely of stress-strain analysis of abdominal aortic aneurysm (AAA). The introduction describes briefly the possibility of aneurysm occurrence with a focus on an aneurysm in the abdominal aorta.
333	Utveckling av luftkompressormonterad ljuddämpare / Development of an air compressor mounted silencer Mustafa, Kobin, Rozumberski, Kristian January 2018 (has links) Ett ljudfenomen som uppstår i samband med luftkomprimeringen i den nya D7 motorn har uppmärksammats som ett problem av kunderna. Ljudfenomenet som resonerar i hytten bidrar till en obehaglig arbetsmiljö. Uppdraget har i sin tur varit att utveckla en luftkompressormonterad ljuddämpare mot en kravspecifikation som eliminerar detta fenomen. Med hjälp av diverse verktyg och en spiral produktutvecklingsprocess utfördes ett flertal iterationer av dem koncept som kan tänkas lösa problemet. Dessa iterationer konstruerades i mjukvaran CATIA V5 för att sedan beställas in som fysiska prototyper i materialet Pa12. För att bekräfta prototypernas funktionalitet utfördes simuleringar samt fysiska tester. Det resulterande arbetet blev ett konceptförslag till Scania CV AB som uppfyller kravspecifikationerna. Lösningens ljuddämpningsförmågan reducerade ljudfenomenet med 73% i genomsnitt. Med hjälp av observationer och analyser under de fysiska testgenomförandet uppmärksammades komplikationer som bör åtgärdas. Det mest kritiska med det nuvarande konceptet är dem vibrationer som uppstår. För att åtgärda detta problem kommer det krävas ytterligare infästningspunkter på motsvarande sida till de nuvarande. All mätdata i denna rapport är modifierat. Detta för att skydda känslig information. / A noise phenomenon that arises in connection with air compression in the new D7 engine has been noted as a problem by the customers. The sound phenomenon resonates in the cabin contributes to an unpleasant work environment. The mission, in turn, has been to develop an air compressor-mounted silencer against a requirement specification to eliminate this phenomenon. Using various tools and a spiral product development process, a number of iterations were made of those concepts that could solve the problem. These iterations were engineered in the CATIA V5 software, then ordered as physical prototypes in the material Pa12. To confirm the prototypes' functionality, simulations and physical tests were performed. The resulting work became a concept proposal for Scania CV AB that meets the requirements specifications. The solution managed to reduce the sound phenomenon by 73% on average. With the help of observations and analyzes during the physical test implementation, complications were noted that should be addressed. The most critical on the current concept is the vibration that occurs. To fix this problem additional attachment points will be required on the corresponding side to the current ones. All data in this report have been modified. This is to protect sensitive information. Product development muffler sound phenomenon air compressor truck Scania CV AB engine CATIA V5 analysis design installation concept spiral product development process ergonomics frequency hertz decibel development engineering engineer innovation and design Produktutveckling ljuddämpare ljudfenomen luftkompressor lastbil Scania CV AB motor CATIA V5 analysering konstruktion installationskoncept spiral produktutvecklingsprocess ergonomi frekvens hertz decibel utveckling ingenjör maskiningenjör innovation och design design Engineering and Technology Teknik och teknologier
334	Elumo : - Smart bottenplatta för klivande rullstolar Svensson, Malin, Olsson, Johan January 2022 (has links) Imagine a power wheelchair that can step over obstacles, step up on sidewalks and drive on lateral slopes whilst the user is still seated upright. Previously these features were impossible, but thanks to Elumo this is no longer the case. Elumo is a six-wheeled base to be used on electric wheelchairs. The base has been developed by Malin Svensson and Johan Olsson during their bachelor’s thesis at the Innovation Engineering Program at Halmstad University. The project took place between autumn 2021 and spring 2022. The development of Elumo started with several user studies conducted by the students, where over 70 wheelchair users responded to a survey concerning the everyday life of a person using wheelchairs. These users were later invited to a user workshop where they could list everyday complaints and possible improvements concerning existing power wheelchairs. One of the most common complaints was getting up on sidewalks and driving on uneven terrain. Both of these problems will be solved with the base Elumo. The technology that makes the stepping-feature and improved suspension possible, is patented by the company EMTW and the students have had a close cooperation with them during the development. Our goal is for “Elumo to become a new product that will focus on the user and will deliver innovative power wheelchairs that provide safety, independence and improve quality of life for people using wheelchairs.” Wheelchair Power Wheelchair Elumo MedTech Innovation Engineer. Rullstol Elektrisk rullstol Elumo Medicinteknik Produktutveckling EMTW Användarstudie Fokusgrupp Terrängkörning Klivande rullstol Nivellerande CAD Affärsutveckling Utveckling Utvecklingsingenjör Högskolan i Halmstad. Övrig annan teknik Medical Ergonomics Medicinsk ergonomi Other Medical Engineering Annan medicinteknik Övrig annan medicin och hälsovetenskap
335	Minimization of Noise and Vibration Related to Driveline Imbalance using Robust Design Processes Al-Shubailat, Omar 17 August 2013 (has links) Variation in vehicle noise, vibration and harshness (NVH) response can be caused by variability in design (e.g. tolerance), material, manufacturing, or other sources of variation. Such variation in the vehicle response causes a higher percentage of produced vehicles to have higher levels (out of specifications) of NVH leading to higher number of warranty claims and loss of customer satisfaction, which are proven costly. Measures must be taken to ensure less warranty claims and higher levels of customer satisfactions. As a result, original equipment manufacturers (OEMs) have implemented design for variation in the design process to secure an acceptable (or within specification) response. The focus here will be on aspects of design variations that should be considered in the design process of drivelines. Variations due to imbalance in rotating components can be unavoidable or costly to control. Some of the major components in the vehicle that are known to have imbalance and traditionally cause NVH issues and concerns include the crankshaft, the drivetrain components (transmission, driveline, half shafts, etc.), and wheels. The purpose is to assess NVH as a result of driveline imbalance variations and develop a tool to help design a more robust system to such variations. program. Java quality engineering quality capability studies manufacturing processes manufacturing engineer design engineer sales profit customer concern warranty objectionable Eigen functions vectors Eigen Eigen values identity Euler differential equations differential transfer case shaft driveline static imbalance dynamic imbalance passenger customer driver inboard ear driver outboard ear steering wheel seat track variation Gamma distribution normal distribution standard deviation average variance mean phasor victor scalar linear system LTI linear time invariant transfer function output input microphone accelerometers tachometer channels order frequency frequency domain time domain convolution Transformation Fourier Transformer Fourier imaginary and real logarithmic decibel sensitivity curves run down run up two wheel drive Four Wheel Drive Nissan Truck OEM Original Equipment Manufacturers Data Acquisitions Channels Simulation Six Sigma variability Design Robust sensitivity Vibration Imbalance Noise Harshness NVH Driveline
336	The Leadership Perspective of Promoting Creativity and Innovation : A case study of an R&D organization Bolanowski, Daniel January 2008 (has links) <p>This paper focuses on leadership problems and possibilities regarding creativity in a specific R&D organization. This is done with the help of a model consisting of four domains of special interest for R&D leaders. A survey in the form of personal interviews was conducted with leaders and staff members of two R&D sections in the organization. The analysis pointed towards problems on work load and stress issues. Furthermore the organizational structure of the two sections provided a discussion on optimal structural build‐up in order to maximize creativity. Trust issues arose because of the apparent use of control by upper management as described by lower level leaders and the employees. Indications showed that the trust issues put up obstacles for learning and dealing with failure. On the other hand the relationships between section management and staff were perceived as good. Also the ground works of a good creative work was laid with the trusting relationships between fellow professionals within the group.</p> Leadership innovation relationship connection connectivity failure organization structure manager staff engineer domain creativity matrix project responsibilities reporting evaluation feedback rules corporate governance international fear, R&D research development trust work load pace productivity Ledarskap innovation kreativitet F&U forskning utveckling tillit förtroende arbetsbörda produktivitet relation kontakt misslyckande rädsla organisation struktur chef ledare personal. ingenjör domän matris projekt ansvar raportering utvärdering feedback regler företagsledning internationell Business studies Företagsekonomi
337	The influence of biophysical feedbacks and species interactions on grass invasions and coastal dune morphology in the Pacific Northwest, USA Zarnetske, Phoebe Lehmann, 1979- 09 September 2011 (has links) Biological invasions provide a unique opportunity to study the mechanisms that regulate community composition and ecosystem function. Invasive species that are also ecosystem engineers can substantially alter physical features in an environment, and this can lead to cascading effects on the biological community. Aquatic-terrestrial interface ecosystems are excellent systems to study the interactions among invasive ecosystem engineers, physical features, and biological communities, because interactions among vegetation, sediment, and fluids within biophysical feedbacks create and modify distinct physical features. Further, these systems provide important ecosystem services including coastal protection afforded by their natural features. In this dissertation, I investigate the interactions and feedbacks among sand-binding beach grass species (a native, Elymus mollis (Trin.), and two non-natives, Ammophila arenaria (L.) Link and A. breviligulata Fernald), sediment supply, and dune shape along the U.S. Pacific Northwest coast. Dunes dominated by A. arenaria tend to be taller and narrower compared to the shorter, wider dunes dominated by A. breviligulata. These patterns suggest an ecological control on dune shape, and thus, coastal vulnerability to overtopping waves. I investigate the causes and consequences of these patterns with experiments, field observations, and modeling. Specifically, I investigate the relative roles of vegetation and sediment supply in shaping coastal dunes over inter-annual and multi-decadal time scales (Chapter 2), characterize a biophysical feedback between beach grass species growth habit and sediment supply (Chapter 3), uncover the mechanisms leading to beach grass coexistence and whether A. breviligulata can invade and dominate new sections of coastline (Chapter 4), and examine the non-target effects resulting from management actions that remove Ammophila for the recovery of the threatened Western Snowy plover (Charadrius alexandrinus nivosus) (Chapter 5). I found that vegetation and sediment supply play important roles in dune shape changes across inter-annual and multi-decadal time scales (Chapter 2). I determined that a biophysical feedback between the beach grass growth habits and sediment supply results in species-specific differences in sand capture ability, and thus, is a likely explanation for differences in dune shape (Chapter 3). I found that all three beach grass species can coexist across different sediment deposition rates, and that this coexistence is largely mediated by positive direct and indirect species interactions. I further determined that A. breviligulata is capable of invading and dominating the beach grass community in regions where it is currently absent (Chapter 4). Combined, these findings indicate that A. breviligulata is an inferior dune building species as compared to A. arenaria, and suggest that in combination with sediment supply gradients, these species differences ultimately lead to differences in dune shape. Potential further invasions of A. breviligulata into southern regions of the Pacific Northwest may diminish the coastal protection ability of dunes currently dominated by A. arenaria, but this effect could be moderated by the predicted near co-dominance of A. arenaria in these lower sediment supply conditions. Finally, I found that the techniques used to remove Ammophila for plover recovery have unintended consequences for the native and endemic dune plant communities, and disrupt the natural disturbance regime of shifting sand. A whole-ecosystem restoration focus would be an improvement over the target-species approach, as it would promote the return of the natural disturbance regime, which in turn, would help recover the native biological community. The findings from this dissertation research provide a robust knowledge base that can guide further investigations of biological and physical changes to the coastal dunes, can help improve the management of dune ecosystem services and the restoration of native communities, and can help anticipate the impacts of future beach grass invasions and climate change induced changes to the coast. / Graduation date: 2012 / Access restricted to the OSU Community at author's request from Sept. 22, 2011 - March 22, 2012 ecosystem engineer invasive species coastal dune foredune wind tunnel species interactions Ammophila arenaria Ammophila breviligulata Elymus mollis beach grass Charadrius alexandrinus nivosus targeted management Oregon Washington ecosystem service coastal protection sediment supply Lotka-Volterra facilitation coexistence indirect effects sand supply species distributions sediment transport Elymus -- Ecology -- Northwest, Pacific Sand dunes -- Northwest, Pacific Sand dune ecology -- Northwest, Pacific Grasses -- Ecology -- Northwest, Pacific
338	The Leadership Perspective of Promoting Creativity and Innovation : A case study of an R&D organization Bolanowski, Daniel January 2008 (has links) This paper focuses on leadership problems and possibilities regarding creativity in a specific R&D organization. This is done with the help of a model consisting of four domains of special interest for R&D leaders. A survey in the form of personal interviews was conducted with leaders and staff members of two R&D sections in the organization. The analysis pointed towards problems on work load and stress issues. Furthermore the organizational structure of the two sections provided a discussion on optimal structural build‐up in order to maximize creativity. Trust issues arose because of the apparent use of control by upper management as described by lower level leaders and the employees. Indications showed that the trust issues put up obstacles for learning and dealing with failure. On the other hand the relationships between section management and staff were perceived as good. Also the ground works of a good creative work was laid with the trusting relationships between fellow professionals within the group. Leadership innovation relationship connection connectivity failure organization structure manager staff engineer domain creativity matrix project responsibilities reporting evaluation feedback rules corporate governance international fear, R&D research development trust work load pace productivity Ledarskap innovation kreativitet F&U forskning utveckling tillit förtroende arbetsbörda produktivitet relation kontakt misslyckande rädsla organisation struktur chef ledare personal. ingenjör domän matris projekt ansvar raportering utvärdering feedback regler företagsledning internationell Business studies Företagsekonomi
339	Das neue Kontaktmodell in Mechanica WF 4.0 mit Reibung : Theoretische Grundlagen und Anwendungsbeispiele Jakel, Roland 11 May 2009 (has links) (PDF) Der Vortrag stellt das neue, unendlich reibungsbehaftete Kontaktmodell der FEM-Berechnungssoftware Pro/ENGINEER Mechanica in der Version Wildfire 4.0 von PTC vor. Dabei werden sowohl die Grundlagen des reibungsfreien Kontaktes als auch die Theorie des unendlich reibungsbehafteten Kontaktmodells behandelt sowie die Grundlagen der zur numerischen Lösung in der Software verwendeten Penalty- und Newton-Raphson-Methode erläutert. Als Anwendungsbeispiel für das reibungsfreie Kontaktmodell wird ein Zylinderrollenlager vollständig mit sämtlichen Wälzkontakten für verschiedene Lager- und Einbauspiele berechnet, die Ergebnisse umfassend dargestellt sowie eine analytische Gegenrechnung nach der Hertzschen Theorie ausgeführt, die sehr gute Übereinstimmung mit der numerischen Simulation zeigt. Für das reibungsbehaftete Kontaktmodell wird exemplarisch eine geschrumpfte Welle-Nabe-Verbindung unter Torsion berechnet. Diese wird einer analytischen Lösung sowie verschiedenen 2D-Idealisierungen (ebener Spannungszustand, ebener Dehnungszustand, 2D-Axialsymmetrie) gegenübergestellt. FEM-Methode FEM-method Hertzian contact presssure Idealisierungen: Ebener Spannungszustand ebener Dehnungszustand Axialsymmetrie Kontaktdruckverteilung Newton-Raphson-method Pro/ENGINEER Mechanica Schlupfindikator contact pressure contact with friction cylindrical roller bearing distribution idealizations: plane stress state plane strain state axial symmetric state infinite friction penalty method reibungsbehafteter Kontakt rolling bearing shaft-hub joint slippage indicator unendliche Reibung ddc:620 Ebener Spannungszustand Hertz-Flächenpressung Kontakt <Reibung> Newton-Verfahren Penalty-Methode Wellen-Naben-Verbindung Wälzlager Zylinderrollenlager Zylindrische Anordnung contact
340	Návrh předpjaté nádrže / Design of reinforced tank Štramberský, Martin January 2014 (has links) The matter of this diploma thesis is a static storage tank for petroleum substances, the study of a solution for appropriate shape of shell and its effort to dihedral for roofing, and the study of effect of the storage of inner roofs walls of the tank to the size of the internal forces. The internal walls are carried out by the method of finite elements in the engineering program Scia Engineering 2013 and on the basis of it, designing of the framing sections of the tank. There is a calculation part of the lower horizontal bias wreaths of the shell and internal supporting wall. All the components are assessed on the 1st limit state of the load-bearing capacity and the 2nd limit state of the application (emergence cracks, limiting voltage in the concrete and a prestressing steel). The existing external wall is assessed only on the marginal status load of carrying capacity. The part of diploma thesis is also drawing documentation, accompanying report and technical report. The goal of the diploma thesis was to design the tank without an occurrence of the cracks in the concrete so as the vertical wall was prestressing only in the horizontal direction and the optimal proposal roof tanks as an addition.

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