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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

The development and application of instrumentation and computer resources for the investigation of lateral strata movement and powered support interaction on longwall coalfaces

Burstwistle, P. T. January 1987 (has links)
No description available.
2

Sensitivy analysis and graph-based methods for black-box functions with on application to sheet metal forming. / Nouvelles méthodes pour l'analyse de sensibilité des fonctions boîte noire. Application à l’emboutissage.

Fruth, Jana 12 March 2015 (has links)
Le domaine général de la thèse est l’analyse de sensibilité de fonctions boîte noire. L’analyse de sensibilité étudie comment la variation d’une sortie peut être reliée à la variation des entrées. C’est un outil important dans la construction, l’analyse et l’optimisation des expériences numériques (computer experiments).Nous présentons tout d’abord l’indice d’interaction total, qui est utile pour le criblage d’interactions. Plusieurs méthodes d’estimation sont proposées. Leurs propriétés sont étudiées au plan théorique et par des simulations.Le chapitre suivant concerne l’analyse de sensibilité pour des modèles avec des entrées fonctionnelles et une sortie scalaire. Une approche séquentielle très économique est présentée, qui permet non seulement de retrouver la sensibilité de entrées fonctionnelles globalement, mais aussi d’identifier les régions d’intérêt dans leur domaine de définition.Un troisième concept est proposé, les support index functions, mesurant la sensibilité d’une entrée sur tout le support de sa loi de probabilité.Finalement les trois méthodes sont appliquées avec succès à l’analyse de sensibilité de modèles d’emboutissage. / The general field of the thesis is the sensitivity analysis of black-box functions. Sensitivity analysis studies how the variation of the output can be apportioned to the variation of input sources. It is an important tool in the construction, analysis, and optimization of computer experiments.The total interaction index is presented, which can be used for the screening of interactions. Several variance-based estimation methods are suggested. Their properties are analyzed theoretically as well as on simulations.A further chapter concerns the sensitivity analysis for models that can take functions as input variables and return a scalar value as output. A very economical sequential approach is presented, which not only discovers the sensitivity of those functional variables as a whole but identifies relevant regions in the functional domain.As a third concept, support index functions, functions of sensitivity indices over the input distribution support, are suggested.Finally, all three methods are successfully applied in the sensitivity analysis of sheet metal forming models.
3

Optimering av Produktstyrning genom Integrerat Logistikstöd: Minimera Livscykelkostnader / Optimizing Product Management through Integrated Logistic Support: Minimizing Life Cycle Costs

Bergström, Elliot, Mathisson, Felix January 2024 (has links)
Integrated Logistics Support (ILS) is a tool that ensures the operation and longevity of products and systems throughout their lifecycle. The method structures logistics support activities and yields results that simplify, prevent, or mitigate risk areas, ultimately aiming to minimize lifecycle costs. ILS was developed within the defense industry, but its use in the civilian sector is still limited, indicating untapped potential. The purpose of the research is to investigate the process of ILS implementation and the potential benefits it could bring to the civilian industry. The emphasis is on comprehending the process and methodically developing guidelines that organizations can adopt. This purpose is achieved through an initial literature review examining integrated logistics support. The ideas are then implemented in a case study to demonstrate the process and generate improvement strategies. Based on the case study, the conclusion is drawn that the method achieves the desired effects. A generalized methodology is presented, which can be utilized by civilian companies and organizations.

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