Dissertations / Theses on the topic 'Belt Drive Systems'
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1
Zhang, Lixin. "Dynamic analysis of viscoelastic serpentine belt drive systems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0021/NQ45747.pdf.
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Yang, Xuedong. "Modeling and control of two-axis belt-drive gantry robots." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/13061.
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Masaki, Mukalu Sandro. "A cost-effective design approach for multiple drive belt conveyor systems." Diss., University of Pretoria, 2005. http://hdl.handle.net/2263/66217.
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Multiple drive belt conveyors are being increasingly incorporated in mining plans worldwide because of their high economic performance and the ease of moving these installations around, especially in underground mines. A typical modern multi-drive conveyor system consists of one or more intermediate drive stations positioned along the upper stretch of the conveyor and a single drive station situated in the lower stretch. Despite the acknowledged cost saving potential of the multiple drive technology, no previous work was reported on the methodology to realize a cost-effective design of multi-drive belt conveyors. This study investigates a design approach for multiple drive belt conveyors with the objective to achieve the lowest life cycle cost of multi-drive belt conveyors for a specified material transport task. For this purpose, an optimization model for the cost-effective design of multi-drive conveyor systems is formulated on the basis of the recommendations of the DIN 22101 and SANS 1313 standards. For a given number of intermediate drive stations, the proposed model optimizes a set of design parameters so that the minimum equivalent annual cost of a conveyor can be attained whilst handling the transport requirements and design conditions. The conveyor parameters optimized in this study are the rated powers of motors, the rated torques of gear reducers, the diameters and wrap angles of drive pulleys, the belt width, the belt speed, the lengths of the belt sections not nestled between drive pulleys, the spacings between idler rolls and the shell diameters and shaft diameters of idler rolls. For benchmark analysis purposes, a similar optimization model is also developed for the single drive technology. Described as mixed integer nonlinear programming (MINLP) problems, the two optimization models are solved using the MIDACO solver embedded in the MATLAB environment. The results of this study show the validity and effectiveness of the design model proposed for multi-drive belt conveyors. The results also indicate that the multiple drive technology is more beneficial for the conveying over long distances. The impact of the possible instability of inflation throughout the project lifetime is also investigated through three hypothetical scenarios, which involve a fixed inflation rate, a higher fluctuating inflation rate and a lower fluctuating inflation rate, respectively. The results of this sensitivity analysis show that the most cost-effective multi-drive belt conveyors obtained under a fixed inflation rate is robust enough against limited fluctuations of this parameter.Dissertation (MEng)--University of Pretoria, 2017.
Electrical, Electronic and Computer Engineering
MEng
Unrestricted
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DI, NAPOLI MARIA. "Modeling and experimental characterization of belt drive systems in micro-hybrid vehicles." Doctoral thesis, Politecnico di Torino, 2018. http://hdl.handle.net/11583/2715955.
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Belt Drive Systems (BDS) constitute the traditional automotive mechanism used to power the main internal accessories (such as the alternator, water pump and air conditioning pump) taking power from the engine's crankshaft rotational motion. BDS usually work in the severe ambient conditions of the engine compartment and are subject to highly dynamic excitations coming from the crankshaft harmonics. The substitution of the traditional alternator with an electric machine, namely Belt Starter Generator (BSG), is the most promising micro-hybrid technology towards a quick and effective satisfaction of the current regulations of fuel consumption and pollutant emissions reduction. The use of a BSG leads to increased stresses in the already complex front end accessory drive. As a matter of fact, a BSG is an electrical machine able to work both as motor and as generator and defines two distinct functioning modes of the drive, namely motor and alternator modes. The relative alternation of tight and slack spans profoundly changes the functionality of the overall drive and affects its transmissions capability and efficiency, furthermore resulting in NVH (noise vibration harshness) effects that need to be carefully addressed. Traditional automatic tensioners acting on the slack span of the alternator mode application are not capable of facing the irregular stresses of a BSG-based BDS which requires the use of a tensioning device capable of keeping the belt tension inside a safe range and of preventing slippage during all the operating conditions of the drive. With this goal many solutions are currently being investigated, such as the cooperation of two tensioners one for each span, active tensioners, double arm tensioners or hydraulic tensioners. The critical issues due to the involvement of BSG in BDS require a deep study focused on the tension conditions of the belt and its influence on the overall efficiency of the system.
The aim of the research described in this thesis is to obtain a defined modelling approach of belt drive systems for micro-hybrid vehicles and to validate it through extensive experimental analysis.
To obtain a reliable testing environment, a dedicated full-electric test rig was designed and realized. The test rig presented in this work is capable of assuring the repeatability and accuracy of the measurements leaving aside the uncertainties deriving from the irregularities of the ICE behaviour that usually affect the experimental activities conducted on front engine accessory drives.
After providing both the modelling and testing environment as assets for the analysis, several experimental activities are carried out with the goal of assessing the dynamic behaviour of belt drive systems and their efficiency, comparing the performances of different tensioning solutions, understanding the behaviour in static and dynamic conditions of a traditional automatic tensioner and one example of an omega twin arm tensioner, which is the tensioning solution most explored by the manufacturers at present.
The ultimate goal of gaining a complete understanding of belt drive systems in the special case of micro-hybrid vehicles is eventually fulfilled by an experimental validation of the static and dynamic models proposed.
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Zhu, Farong. "Nonlinear dynamics of one-way clutches and dry friction tensioners in belt-pulley systems." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1158689667.
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Kilic, Ergin. "Structured Neural Networks For Modeling And Identification Of Nonlinear Mechanical Systems." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614735/index.pdf.
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Most engineering systems are highly nonlinear in nature and thus one could not
develop efficient mathematical models for these systems. Artificial neural
networks, which are used in estimation, filtering, identification and control in
technical literature, are considered as universal modeling and functional
approximation tools. Unfortunately, developing a well trained monolithic type
neural network (with many free parameters/weights) is known to be a daunting
task since the process of loading a specific pattern (functional relationship) onto a
generic neural network is proven to be a NP-complete problem. It implies that if
training is conducted on a deterministic computer, the time required for training
process grows exponentially with increasing size of the free parameter space (and
the training data in correlation). As an alternative modeling technique for
nonlinear dynamic systemsthis thesis proposed a general methodology for structured neural network topologies and their corresponding applications are realized. The main idea behind this (rather classic) divide-and-conquer approach is to employ a priori information on the process to divide the problem into its fundamental components. Hence, a number of smaller neural networks could be designed to tackle with these elementary mapping problems. Then, all these networks are combined to yield a tailored structured neural network for the purpose of modeling the dynamic system under study accurately. Finally, implementations of the devised networks are taken into consideration and the efficiency of the proposed methodology is tested on four different types of mechanical systems.
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Lioy, Gerald T. "Optimization of an elastic drive belt system using an algorithm of automated optimal design /." Online version of thesis, 1985. http://hdl.handle.net/1850/9042.
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Pakhotin, Ivan. "Fusion of first principles driven and system science approaches to advance radiation belt forecasting." Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/7260/.
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Modern radiation belt models can be broadly split into either physics-driven diffusion based algorithms, or data science techniques that utilise the continuous data coverage from satellites at geostationary orbit and the Lagrange point L1 to apply statistical data analysis methods to predict electron fluxes at geostationary orbit. The first kind, while posessing generality due to their physical nature, lack accuracy compared to their data-driven counterparts. This is because the magnetosphere is a highly complex system that is not easy to model and its dynamics are not yet fully understood. Meanwhile, data-driven methods possess statistical accuracy, but cannot predict outside their operating parameters, and so on their own provide no information about what happens in the wider radiation belt region. This thesis is devoted to the development of a model that combines the two approaches into one unified system, attempting to combine the predictive range of physical modelling with the accuracy of the data-driven approach. This model uses geosynchronous orbit fluxes predicted using an advanced data science technique as an input to drive a physics-based radiation belt modelling code. The model has been developed and tested for a range of energy channels, magnetospheric conditions, and with various modifications. It was validated using data from NASA's recent Van Allen probes mission and with NOAA's GOES-13 geostationary satellite. The model results are in good agreement with observations, with the sources of inaccuracies explored in the manuscript. This work is a first attempt to create such a model, and potential improvements are outlined that should further increase accuracy. A further modification of the model is explored that is found to provide superior performance at geostationary orbit at the cost of degraded performance elsewhere. It is proposed to use this modification in tandem with the main model, where accurate information about geostationary orbit is required. The modification has been tested on long-duration time periods and was found to generate good predictions for high-energy electron fluxes. The role of electromagnetic ion cyclotron (EMIC) waves is explored using wave vector analysis and calculation of minimum resonant energies. The aim is to identify what effect EMIC waves have on electron dynamics at energies below 1 MeV. The conclusions are that EMIC waves, under certain conditions, do affect these electron populations in the magnetosphere, and their effect should be included in a representative radiation belt model. This is suggested as a further improvement to the simulation.
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Weekes, Alix M. "Systems for the automotive industry for improved safety of pregnant occupants." Thesis, Loughborough University, 2010. https://dspace.lboro.ac.uk/2134/6374.
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The thesis presents an investigation of pregnant women s safety and comfort needs during car travel. A survey is used to investigate all aspects and problems of car travel. This survey is a comprehensive examination of the entire driving activity with much detail of reported difficulties from pregnant women that forms a novel resource for the automotive engineers. The survey results are used to generate guidelines for the automotive industry. A series of sled tests are presented that investigate seat belt use in pregnancy including the use of lap belt positioners. The peak abdominal pressure results clearly agree with current guidelines that the lap belt should be positioned across the hips and not across the abdomen. This research includes a novel anthropometric dataset for 107 pregnant women including measurements especially selected for the field of automotive design and to describe the changes of pregnancy. This includes investigation of pregnant driver s proximity to the steering wheel. A novel measurement of knee splay is used to define the pregnant women s preference to sit with their knees widely spaced instead of knees together, in both normal sitting and in a car. Comparison is made between the pregnant women's measurements and the available data in the literature for non-pregnant women and males, and this shows that pregnant women can be excluded from designs if the accommodation does not consider their needs. The pregnant women's anthropometric data is presented as a novel website in order to make the data available to the automotive industry. This website is generated for use by automotive engineers and is designed to suit their usability needs and the general trends within the industry, in order to make the site more user-friendly and more likely to be used as a reference for pregnant occupant's needs.
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Silva, Carlos Alexandre Ferreira Da. "Modeling and optimization of power losses in poly-V belt transmissions : Application to the Front Engine Accessory Drive of trucks." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI079/document.
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Ces travaux s’inscrivent dans le cadre du projet EDIT(Efficient Distribution Truck, FUI19), piloté par le groupe Volvo Trucks, dont l’objectif de réduction de consommation pour 2020 est fixé à 13% par rapport à un véhicule actuel EURO-6. Le projet EDIT porte sur cinq axes techniques d’amélioration dont un consiste en l’obtention d’un système optimisé de transmission par courroie poly-V au regard des pertes de puissance. Actuellement les faces avant de moteur sont perfectionnées sur le plan mécanique ; cela signifie que la durée de vie de ses composants est optimisée, et que les nuisances vibratoires sont réduites. Par contre, des améliorations peuvent être apportées sur le plan énergétique. Cette thèse, qui a pour objectif d’investiguer les possibilités de réduction et d’optimisation des pertes de puissance sur les façades accessoires, se décline en trois parties : une caractérisation par l’analyse mécanique dynamique des matériaux viscoélastiques des courroies poly-V et des composantes de façade ; une modélisation, une optimisation et une implémentation logicielle des modèles de pertes de puissance ; validées par une dernière partie expérimentale sur banc d’essais. Les pertes de puissances dans une face avant moteur sont de plusieurs types : des pertes internes à la courroie poly-V (hystérésis du caoutchouc), des pertes externes à la courroie (glissement poulie/courroie) et des pertes internes aux composants (frottement dans les roulements). Ces pertes peuvent désormais être quantifiées et optimisées grâce aux modèles développés durant cette thèse. Ces modèles ont été validés et implémentés dans un outil de simulation (PLFead, Power Loss Front engine accessory drive), qui a été développé pour optimiser les pertes de puissance en tenant compte des paramètres de design et de fonctionnement des faces avant moteurThis work is a part of the Efficient Distribution Truck (EDIT, FUI 19) project, led by Volvo Trucks, whose objective is to reduce distribution vehicles’ fuel consumption for 2020 by 13% when compared with the current production vehicle EURO-6. The EDIT project targets five areas of research and technical solutions, one of which consists of obtaining an optimized poly-V belt transmission concerning the power losses. In terms of lifetime of the mechanical components, reduction of noise and vibrations, the Front Engine Accessory Drives (FEADs) are currently one of the most technologically sophisticated systems. However, further improvements can be made to make the vehicles more energy efficient. This thesis, which aims at investigating possibilities for reducing and optimizing the power losses in the FEADs, is composed of three main parts: the characterization of the viscoelastic materials of the poly-V belts via Dynamic Mechanical Analysis (DMA) and the FEAD components; the modeling, the optimization and the implementation of the power loss models in a simulation tool; and their experimental validation through a test bench. The power losses occurring in a FEAD are of several types: poly-V internal losses (hysteresis of the belt-rubber), poly-V external losses (belt/pulley slip) and losses from the accessory drives (friction inside the bearings). These power losses can be quantified and optimized thanks to the models developed throughout this thesis. These models have been validated and implemented in a simulation tool (PLFead, Power Loss Front engine accessory drive), which has been developed to optimize the power losses taking into consideration the design parameters and operating conditions of the FEAD
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Cambrook, Helen Elizabeth. "Investigating the role of T-bet in CD4+ T cell driven central nervous system autoimmunity." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/17608.
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Self-reactive CD4+ helper T cells (Th) are key causal agents in the pathogenesis of many autoimmune diseases. Experimental autoimmune encephalomyelitis (EAE) is a CD4+T cell model of the demyelinating autoimmune disease multiple sclerosis (MS). It has been shown that EAE is caused by CD4+ T-cells that produce pro-inflammatory cytokines IFN-γ (Th1) and IL-17 (Th17). As such, understanding how these Th cells are generated and controlled is essential. There is debate as to whether Th1 and Th17 cells act independently in EAE or if there is plasticity between these two subtypes, and whether the capacity to switch from Th1 to Th17 confers pathogenic capacity. T-bet was first described as the master transcription factor for Th1 cells, and is thought to have a critical role in EAE even though IFN-γ, the Th1 archetypal cytokine, has been shown to be redundant. More recent work has shown that T-bet is expressed in multiple immune cell types, and it remains unclear in what cells the expression of T-bet is required for EAE. Considerable efforts have been put into understanding the role of T-bet in EAE pathogenesis, with a view to modulate cells expressing T-bet for therapy. The hypothesis of this work was that T-bet has multifaceted roles in EAE, in initiating and directing an immune response in innate antigen presenting cells such as dendritic cells (DC) as well as programming pathogenic effector CD4+ T cell (Teff) response to antigen. T-bet-/- mice were studied using different models of EAE to dissect the role of T-bet in disease pathogenesis. Active immunisation of C57BL/6 mice with the immunodominant peptide from myelin oligodendrocyte glycoprotein (MOG35-55) showed that T-bet-/- mice developed EAE with an IL-17 dominated profile and critically, T-bet-/- mice were able to produce GM-CSF which has recently been described as a key cytokine for EAE. T-bet-/- cells were not able to transfer EAE in a model of passive transfer EAE, where CD4+ T cells were polarised towards a Th1 profile in vitro. Illustrating that T-bet is required in CD4+ T cells for Th1 mediated EAE. DC driven EAE showed that T-bet-/- DC were able to activate CD4+ T cells in vitro and cause EAE upon co-transfer into host mice with transgenic CD4+ T cells. Thus, it has been shown that T-bet is not required in EAE. This work represents a step further towards understanding the disease mechanisms involved in EAE and suggests T-bet is not an appropriate therapeutic target for the treatment of MS.
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Sumser, Anton [Verfasser], and Bert [Akademischer Betreuer] Sakmann. "Structure and dynamics of the corticothalamic driver pathway in the mouse whisker system / Anton Sumser ; Betreuer: Bert Sakmann." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2016. http://d-nb.info/1117474186/34.
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Schützhold, Jörg. "Auswahlsystematik für energieeffiziente quasistationäre elektrische Antriebssysteme." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-218139.
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Rund 70 % der Energieaufnahme von elektrischen Antriebssystemen wird von quasistationären Antrieben in Transportanlagen hervorgerufen. Eine gesteigerte Energieeffizienz führt neben reduzierten Energiekosten zu weiteren Nutzeffekten, wie z.B. einem verringerten Kühlaufwand, einem kleinerem Bauraum und einer höheren Lebensdauer der Komponenten. Zur Steigerung der Energieeffizienz dieser Transportanlagen werden in dieser Arbeit Methoden zur Auslegung der zugehörigen Antriebssysteme unter besonderer Berücksichtigung des Förderprozesses erarbeitet. Als repräsentative Transportanwendungen werden Pumpen- und Förderbandanlagen untersucht.
Dabei wird das gesamte elektromechanische System analysiert, um das volle Energiesparpotenzial zu erfassen – beginnend mit dem Lastprofil des transportierten Förderguts bis hin zur elektrischen Energieversorgung. Hierzu werden alle Systemkomponenten modelliert, um die Verluste in verschiedenen Betriebspunkten im Volllast- und Teillastbereich abzuschätzen.
Darauf aufbauend erfolgt die Erarbeitung praktikabler Projektierungshinweise und prozessspezifischer Auswahldiagramme, welche eine schnelle Vorauswahl der energieeffizientesten Antriebstopologie ermöglichen. Da die Verlustmodelle auf frei zugänglichen Datenblattangaben basieren, können die vorgestellten Methoden und Auswahlkriterien bereits in einem frühen Projektierungsstadium zur Auslegung einer energieeffizienten Transportanlage angewandt werden.
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Fournier, Etienne. "Protocole de diagnostic des entraînements asynchrones par références : application à la détection des déséquilibres mécaniques et des défauts de courroies." Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/15546/1/E_Fournier.pdf.
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Les applications entrainées par des moteurs asynchrones consomment à elles seules la majorité de l’énergie électrique utilisée dans le secteur industriel. Des défauts, majoritairement d’origine mécanique, sont susceptibles de se développer au cours du fonctionnement de ces systèmes et rendent nécessaires la mise en place d’une maintenance souvent onéreuse. Afin de réduire ces coûts et d’optimiser la disponibilité des matériels, des méthodes de diagnostic peuvent être développées afin de détecter au plus tôt l’apparition d’un défaut. Cependant, la fiabilité de ces algorithmes et l’automatisation du diagnostic sont complexifiées par la diversité des systèmes alimentés par les variateurs de vitesse industriels ainsi que par le changement de leur point de fonctionnement. Afin de répondre à ces problématiques, un protocole de diagnostic permettant de réaliser une détection sensible et robuste des défaillances mécaniques est développé dans ce travail. Cette méthode consiste à segmenter le plan couple-vitesse du moteur surveillé et à réaliser des références statistiques caractérisant son fonctionnement sain sur chacune des zones de fonctionnement. Des indicateurs de défaut peuvent ensuite être définis statistiquement afin de quantifier l’écart du système vis-à-vis de son comportement sain. Ces indicateurs sont ainsi indépendants du système surveillé et de son point de fonctionnement. Les principales applications ciblées par ce protocole sont les systèmes de compression, de pompage et de ventilation qui représentent une part importante de l’énergie électrique consommée dans le secteur industriel. Le protocole de diagnostic développé dans cette étude est validé expérimentalement dans le cadre de la détection de différentes niveaux de déséquilibre mécanique mais également pour la surveillance d’un système de transmission de type poulies-courroies. De plus, les campagnes expérimentales sont effectuées sur plusieurs systèmes électromécaniques dont les propriétés sont foncièrement différentes afin de valider les performances de normalisation de ce protocole.
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Robinson, Peter William Alexander. "Dynamics of open and closed belt conveyor systems incorporating multiple drives." Thesis, 2016. http://hdl.handle.net/1959.13/1312200.
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Research Doctorate - Doctor of Philosophy (PhD)The incorporation of conveyor systems throughout industry has seen an increase in demand for systems that exceed the specification of conventional conveyors. This coupled with the demand to convey bulk materials over larger distances, at higher speeds and efficiencies, requires the development of a versatile design approach. This thesis explores the design aspects associated with modern pouch conveying systems, and how they vary, and can be adapted from theories used with conventional troughed conveyors. In particular, the indentation rolling resistance (IRR) is explored in detail, as this can account for up to 60% of the drag forces of a system. This is the drag force that arises due to an asymmetric pressure distribution as the idler roll shell indents the bottom cover of the belt. The potential idler roll arrangements for a generic pouch conveying system are analysed, and compared with experimental values. In addition to this, the drive traction attainable from suitable drive stations is analysed. Troughed conveyors typically wrap the conveyor belt around a large drive pulley, generating large amounts of traction. Given the layout of pouch conveying systems, a different approach is required, at multiple locations. As such, pouch conveyors are typically driven through simply supported drive stations, with small areas of contact with the belt. The useable traction from these point contact drives is considered. These theories are then united and applied to a dynamic package capable of handling multiple conveyor designs. This package utilises Finite Element Modelling (FEM) to model the viscoelastic nature of the system, based on the distributed drag forces, and inputs of the conveyor. Lastly, to qualify this theory, experimental analysis is conducted on an on-site installation, and compared with the theoretical results.
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Nouri, Mostafa. "Design optimization and active control of serpentine belt drive systems with two-pulley tensioners." 2005. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=370999&T=F.
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Musselman, Marcus William. "Improvement of belt tension monitoring in a belt-driven automated material handling system." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-08-1712.
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The goal of the study presented in this thesis was the improvement of estimation and monitoring procedures for condition monitoring of belt tension and misalignment in belt-driven automated material handling systems widely used in modern semiconductor manufacturing systems. In pursuit of this goal, two 3-factor, 3-level experiments were designed to study how belt vibration characteristics depend on changes in belt length, belt tension, belt misalignment, and initial location of the excitation of belt vibration. Dependent variables in each of the experiments were drawn from a denoised frequency spectrum calculated from an Autoregressive model of the belt vibration time-series. A feature vector was developed from the Autoregressive features via variance based sensitivity analysis. Results showed that belt vibration characteristics were sensitive to changes in all of the independent variables examined. These results motivated the design of a device to improve the standardized technique widely used to monitor belt tension in belt-driven material handling systems. Reducing variance in the belt length and the location of the initial excitation of belt vibration yielded a reduction of tension estimate standard deviation an order of magnitude, as compared to a human performing the standardized technique. Thus, the use of this device provided higher belt tension estimate resolution. Future work that could lead to a less intrusive technique is presented.text
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Olatunde, Adebukola Olsanmi. "Design and Analysis of a Tensioner for a Belt-driven Integrated Starter-generator System of Micro-hybrid Vehicles." Thesis, 2008. http://hdl.handle.net/1807/17209.
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The thesis presents the design and analysis of a Twin Tensioner for a Belt-driven Integrated Starter-generator (B-ISG) system. The B-ISG is an emerging hybrid transmission closely resembling conventional serpentine belt drives. Models of the B-ISG system's geometric properties and dynamic and static states are derived and simulated. The objective is to reduce the magnitudes of static tension in the belt for the ISG-driving phase. A literature review of hybrid systems, serpentine belt drive modeling and automotive tensioners is included. A parametric study evaluates tensioner parameters with respect to their impact on static tensions. Design variables are selected from these for an optimization study. The optimization uses a genetic algorithm (GA) and a hybrid GA. Results of the optimization indicate the optimal system contains spans with static tensions that are significantly lower in magnitude than that of the original design. Implications of the research on future work are discussed in closing.
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Hall, Taylor Quinn. "System reliability for bridge bent foundations on driven piles." 2013. http://hdl.handle.net/2152/21951.
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Modern day bridge foundations are often designed for the maximum loading
condition on a single member and each following foundation member often follows the
same design. A 4-pile and a 2-pile foundation system were analyzed with an upperbound
plasticity model in an attempt to approximately represent the system capacity. A
sensitivity analysis was performed to measure the change in the ultimate system capacity
by altering the parameters used to define individual pile capacities. The load and the
resistance are considered to be normally distributed and are each characterized by a mean
and a standard deviation. A first order reliability method was used to measure and
account for any system redundancy in the foundation system by predicting a probability
of failure based on the load and resistance of the system. Based on the most heavily
loaded pile and the analysis performed on the 2-pile and 4-pile foundation systems, the
probabilities of failure are lower for the system than for the single pile. This would bring
reason to state there is some measurable redundancy in the basic systems analyzed where
these systems would once be considered to be non-redundant systems.text
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Chen, Hui. "Modeling and analysis of a belt-driven integrated starter generator system with two independent tensioners." 2009. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=958053&T=F.
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Bott, Gregory. "The Effects of a Quality Grading System on the Development of Consumer Driven Best Practice Value Chains: The Example of Meat Standards Australia." Master's thesis, 2010. http://hdl.handle.net/10048/1444.
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This research project analyzes the beef grading system in Australia. Firstly, the Meat Standards Australia (MSA) grading system as a potential value-creating and value chain-coordinating mechanism is investigated. In-depth interviews with value chain stakeholders and industry experts suggest that the implementation of the MSA grading system has had a catalytic effect of moving value chains toward a greater level of coordination. The concept of best value supply chains is also used as a benchmark in determining MSAs effect on value chain performance.
Secondly, using a survey of Australian consumers, findings suggest that the MSA certification is perceived as a trustworthy signal for tenderness and quality, reducing information asymmetry at the consumer level. This thesis then addresses the questions of whether or not it is necessary to use a grading system in consumer marketing (e.g. quality label) in order to be successful in terms of adding value to the industry.Agricultural and Resource Economics
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Schützhold, Jörg. "Auswahlsystematik für energieeffiziente quasistationäre elektrische Antriebssysteme: - am Beispiel von Pumpen- und Förderbandanlagen -." Doctoral thesis, 2015. https://tud.qucosa.de/id/qucosa%3A30146.
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Rund 70 % der Energieaufnahme von elektrischen Antriebssystemen wird von quasistationären Antrieben in Transportanlagen hervorgerufen. Eine gesteigerte Energieeffizienz führt neben reduzierten Energiekosten zu weiteren Nutzeffekten, wie z.B. einem verringerten Kühlaufwand, einem kleinerem Bauraum und einer höheren Lebensdauer der Komponenten. Zur Steigerung der Energieeffizienz dieser Transportanlagen werden in dieser Arbeit Methoden zur Auslegung der zugehörigen Antriebssysteme unter besonderer Berücksichtigung des Förderprozesses erarbeitet. Als repräsentative Transportanwendungen werden Pumpen- und Förderbandanlagen untersucht.
Dabei wird das gesamte elektromechanische System analysiert, um das volle Energiesparpotenzial zu erfassen – beginnend mit dem Lastprofil des transportierten Förderguts bis hin zur elektrischen Energieversorgung. Hierzu werden alle Systemkomponenten modelliert, um die Verluste in verschiedenen Betriebspunkten im Volllast- und Teillastbereich abzuschätzen.
Darauf aufbauend erfolgt die Erarbeitung praktikabler Projektierungshinweise und prozessspezifischer Auswahldiagramme, welche eine schnelle Vorauswahl der energieeffizientesten Antriebstopologie ermöglichen. Da die Verlustmodelle auf frei zugänglichen Datenblattangaben basieren, können die vorgestellten Methoden und Auswahlkriterien bereits in einem frühen Projektierungsstadium zur Auslegung einer energieeffizienten Transportanlage angewandt werden.