Thesis (M.S.)--University of Wisconsin--Madison, 1984. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 126-128).

Thesis (Ph. D.)--University of Texas at Austin, 2009. / Title from PDF title page (University of Texas Digital Repository, viewed on September 9, 2009). Vita. Includes bibliographical references.

Contexte de travail Le travail de thèse se déroulera en collaboration entre le CTDEC et le laboratoire GSCOP de Grenoble sous la responsabilité scientifique de Henri PARIS. Le travail de thèse sera co-dirigé opar Joël RECH (MdCf) du laboratoire LTDS en poste à l'ENI de Saint-Etienne. Le travail de thèse s'inscrit dans le cadre d'un projet dénommé FGVV (Forage à Grande Vitesse Vibratoire) soutenu par le FCE (pôles de compétitivité VIAMECA et ARVES INDUSTRIES). Objectifs industriels et scientifiques Ce projet FGVV vise essentiellement à maîtriser et à industrialiser la technologie dite de « forage vibratoire ». Cette technologie permet de réaliser des trous de très grandes profondeurs grâce à une vibration axiale du foret conduisant à une fine fragmentation des copeaux qui s'évacuent alors naturellement sans aucune difficulté. Le projet fait suite à plusieurs années de travaux scientifiques et technologiques, qui ont montré la viabilité technique et économique de ce procédé. L'objectif de cette thèse est d'étendre l'utilisation de cette technologie à des applications concernant des diamètres plus petits et sur des matériaux plus difficile à usiner. Le domaine du décolletage est souvent confronter à des perçages de petit diamètre, voire très petit diamètre (<1mm) dans des matériaux difficile à usiner (acier inox, titane, …). Dans ces applications, l'incidence de l'âme du foret devient importante et les modèles mis en place trouve leurs limites. De plus, les aspects thermiques et tribologiques à l'interface copeau outil ne sont pas simples à maîtriser et génèrent un amortissement qui peut être préjudiciable au bon fonctionnement de la tête de perçage vibratoire. Il s'agit, dans un premier temps, à l'aide de résultats expérimentaux d'identifier les phénomènes liés à coupe de ces matériaux qui sont les plus influents sur le comportement dynamique de la tête de perçage vibratoire. Dans un deuxième temps, cette caractérisation devrait permettre de mettre en place des modèles permettant de prédire le comportement et ainsi d'identifier des points de fonctionnement intéressants. Ces modèles seront alors intégrés dans un outil de simulation permettant de prédire le fractionnement du copeau et plus largement le comportement du système composé de la tête de perçage vibratoire, du foret et de la pièce. Dans un troisième temps, l'extension vers les très petits diamètres nécessite une bonne compréhension et un modélisation de l'amortissement issu de l'âme du foret qui devient prépondérant est nécessaire. Enfin, une optimisation des paramètres autour des points de fonctionnement identifiés permettra de répondre au mieux aux contraintes de productivité. Une re conception de la tête, intégrant ces nouvelles connaissances, est alors prévue pour répondre au mieux aux applications industrielles. Les modèles mis en place devraient aussi permettre une extension vers les applications sur des pièces en alliages d'aluminium moulées car les phénomènes de collage du copeau et son l'incidence sur la comportement dynamique de la tête de perçage vibratoire sont aussi présent sur ce type de matériau. / Background work The thesis work is conducted in collaboration between the laboratory and CTDEC GSCOP Grenoble in the scientific responsibility of Henri PARIS. This thesis will be co-directed by Joël RECH (MdCf) laboratory LTDS stationed in ENI Saint-Etienne. This thesis is part of a project called FGVV (Forage Vibratoire a Grande Vitesse) supported by the CFE (competitiveness clusters VIAMECA and ARVES INDUSTRIES). Objectives industrial and scientific This project focuses FGVV control and industrialize a technology called "drilling vibration." This technology can make holes very deep thanks to an axial vibration of drills leading to fragmentation of a thin shavings which go out then naturally without any difficulty. The project follows several years of scientific and technological work, which demonstrated the technical and economic viability of this process. The objective of this thesis is to extend the use of this technology in applications involving smaller diameters and materials more difficult to machine. The field of cutting is often confronted with small-diameter holes, even very small diameter (<1 mm) in materials difficult to machine (stainless steel, titanium,…). In these applications, the impact of the soul of drills becomes important and models introduced found their limits. In addition, thermal and tribological aspects to the interface chip tool are not easy to control and generate an amortization, which may adversely affect the proper functioning of the head of drilling vibration. In a first step, using experimental results to identify phenomena related to cutting of these materials which are most influential on the dynamic behavior of the head of drilling vibration. In a second time, this characterization is expected to introduce models to predict the behaviour and identify points of operation interesting. These models are then integrated into a simulation tool to predict splitting chip and more broadly the behaviour of the system composed of the head drilling vibration, and the drill room. In a third time, extending to the very small diameters requires a good understanding and modeling of depreciation from the soul of drills that becomes dominant is necessary. Finally, an optimization settings around the operating points identified will best respond to constraints on productivity. A re design of the head, incorporating this new knowledge, is then scheduled to suit the industrial applications. The models put in place should also allow an extension to the applications on parts of aluminum alloy castings as the phenomena of bonding the chip and its impact on the dynamic behavior of the head drilling vibration are also present on this type material.

Title: Methodology of training trampoline jumps Objectives: The aim of the thesis is to create a methodical support for practicing basic jumps on the trampoline on the basis of controlled interviews with leading Czech experts. Methods: To meet the set goal, we used controlled interviews with selected trainer jumps on the trampoline. The results were confronted with professional literature. The methodical material created was written and written in HD quality. The selection of the respondents as well as the probands who participated in the creation of the visual documentation was deliberate. Results: The outputs include the results of the interviews and the text and image part of the methodology. The result of the video is a 15 - minute video that captures individual elements, from simpler ones, such as direct jumps to more challenging ones, such as salt and screw rotation. The video contains examples of correct execution and demonstrations of direct help. Keywords: trampoline,methodology,training,jumps,elements

Orientador: Olivio Novaski / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica / Made available in DSpace on 2018-07-21T14:28:26Z (GMT). No. of bitstreams: 1 Correa_Mauricio_M.pdf: 18944022 bytes, checksum: fa80ba3f95ae565ff2e1de6ed0385620 (MD5) Previous issue date: 1996 / Resumo: O objetivo principal deste trabalho é estudar o comportamento das afiações Racon (cônica radial) e Cônica em brocas helicoidais de aço rápido e analisar a performance das mesmas, buscando correlacioná-Ias às suas características geométricas. Para esta finalidade, realizou-se ensaios com dois materiais de diferentes usinabilidade, o aço SAE 4340 e o aço SAE 1045 utilizando-se três diferentes velocidades de corte associadas a um avanço específico para cada material. Testaram-se as afiações, repetindo-se as condições de corte três vezes para cada ponto ensaiado, evitando-se dessa maneira, influências aleatórias inerentes aos ensaios e aumentando-se quantitativa e qualitativamente as amostragens obtidas. Através desses experimentos, monitorou-se o percurso de usinagem, os esforços de corte (momento torçor e força de avanço), a evolução do desgaste de flanco e o alargamento dos furos usinados. Com os resultados obtidos levantaram-se hipóteses para explicar o comportamento de vida da ferramenta e esforços de corte (momento torçor e força de avanço). Constatou-se a superioridade da afiação Racon em vida de ferramenta, quando aplicada ao aço SAE 4340 e vida equivalente à Cônica, quando aplicada ao aço SAE 1045. Já, os esforços de corte observados (momento torçor e força de avanço) para afiação Racon mostraram-se inferiores aos da afiação Cônica, para praticamente todos os casos à exceção da força de avanço para a terceira condição de usinagem no aço SAE 1045. A partir dessas considerações presume-se que o comportamento da afiação Racon tende a ser semelhante em performance em outras condições de usinagem para os materiais ensaiados e possivelmente também para outros materiais demonstrando sua evolução frente à afiação Cônica / Abstract: The main goal of this work is to study the behaving of Racon (radiused conventional point) and Conical (conventional) drill points in high speed stell twist drills and analyse their performance, trying to correlate them to their geometrical features. For this purpose, tests with two different machinability materiais, the SAE 4340 and SAE 1045 steeIs, were carried out by using three different cutting speeds associated to an specific feed for each material. The drill points were tested by repeating three times the cutting condictions to each point, avoiding the random influences inherent to them and increasing the obteined samples both in quality and quantity. Cutting length, cutting forces (torque and thrust force), flank wear evolution and widening of the machined holes were supervised through out these tests. Hipoteses to explain toollife behaving and cutting forces (torque and thrust force) were generated with the obtained results. It was verified the superiority of Racon drill point in tool life when the SAE 4340 stell was used. But cutting forces in Racon drill point were inferior when compared to the conventional one in almost all cases, except the thrust force to the third cutting condiction in SAE 1045 steel. Through all these considerations it's presumed that Racon drill point behaving tends to be similar in performance in other cutting condictions in the tested materiaIs and possibly in other materiaIs showing its evolution over the conventional drill point / Mestrado / Engenharia de Fabricação / Mestre em Engenharia Mecânica

This thesis is focused on proposing a design and providing the realisation of a CNC drill used for printed circuits. The first section is concerned with researching the background of CNC drills, which is followed by the proposed design and realisation of a custom model. Fundamental calculations and individual constructional aspects were carried out based on the chosen parameters. Furthermore, the operating electronic functions and the description of a G-code generating program is the main content of the second section. Finally, the last part of this thesis includes economic evaluation and the CNC drill’s assessment in practice.

This document deals with the development of drilling tools by means of CAD and CAE technologies. At first, a brief overview of various design procedures of 3D drill models is presented, possibilities of measurement of force and moment loading during drilling are mentioned, a chip formation mechanism is briefly described and then a list of commonly used explicit (mesh) finite element methods used for cutting simulations is presented. A meshless SPH method have been selected for this work. Although it is able to handle the large deformations easily, it has been used for cutting simulations very rarely and only an orthogonal cutting simulations related information can be found in scientific databases. It has been demonstrated on the orthogonal cutting simulation of A2024-T351 alloy that was also the starting point for SPH simulation of drilling. The following is a decription of the design, simulation and prototyping of new drilling tools - drills with three and two cutting edges and an internal chip channel. This document is focused in detail on the variant with two cutting edges for which SPH drilling simulation has also been performed. Some drawbacks related to more precise chip simulation demands have been revealed, especially a rapid increase in number of SPH elements followed with prolongation of a computational time. Information related to the design of the drilling head with two cutting edges were then used to create the patent application.

The primary purpose of this study was to evaluate the feasibility of controlling oyster drills in Tomales Bay, particularly Urosalpinx cinerea and Ocenebra Japonica (astropods, Muricidae), with chemicals which have been succesfully tested on a number of oyster pests, Including urosalpinx, in Long Island Sound (Loosanoff , 1956- 1961). The problem was polo to provide information. en the present status of drills alle is the bay, a basic preliminary in evaluating others of pest control.

No description available.

In order to help a group of introductory-level music students achieve a foundational understanding of music theory, a series of computer-based instructional modules were developed using a system called Technology-Assisted Language Learning (TALL). This system, though primarily intended to be used in developing natural language-based instruction, was designed to be flexible enough to handle a broad range of academic subjects. The design of the instruction was largely accomplished via formative evaluation, where student and expert reviews of prototypes played a significant role. Students reviewed three separate prototypes of the instruction, and experts in instructional design and evaluation were also asked to provide feedback. The instructional approach of the learning modules consisted of drill and practice exercises, which included remedial feedback. Activities were sequenced such that review was required until a specified level of mastery had been achieved. The implementation of the software was less than perfect as numerous software bugs were present throughout. This caused frustration on the part of students and resulted in inaccuracies in the data collected by the system. A formal evaluation of the software and implementation was conducted in order to answer specific questions generated by those identified as stakeholders in the experience.