<p> It is shown that the experimentally determined deflectional behavior of certain elastomer-lined sleeve bearings under static radial loads can be modeled to some extent by the compressive behavior of flat elastomeric slabs.</p> <p> An equation for the thermal bearing-bore change is developed using the conventional theory for the thermoelasticity of homogeneous cylinders. Some experimental results agree fairly well with this equation. An equation for the bore contraction due to liquid swell is developed in terms of thermoelasticity.</p> <p> Minimizing the lining thickness is recommended for minimizing both the radial deflections and the bore changes.</p> <p> An analysis is made of the frictional forces involved with the interference fit between the lining and its housing.</p> <p> Areas for further investigation are suggested.</p> / Thesis / Master of Engineering (MEngr)

<p> This thesis presents a derivation of a method to obtain two-body, diagonal and non-diagonal, reaction matrix elements for central and tensor forces respectively directly from nucleon-nucleon scattering phase shifts. This procedure eliminates the necessity for constructing a nuclear potential.</p> / Thesis / Master of Science (MSc)

This is Part A. / Abstract Not Provided. / Thesis / Master of Engineering (MEngr)

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No description available.

The deflections of screw rotors under machining forces cause mismatch between the male and female rotors and, consequently, accelerated wear and suboptimal efficiency in their performance. Optimizing the machining process to minimize the generated forces and accounting for the resulting mismatch in the design of the rotor profile requires accurately computing the machining forces in computer simulations. Virtual machining systems combine graphics-based computation of the Cutter-Workpiece Engagement (CWE) with the physics-based models of machining mechanics to simulate the forces during complex machining processes. However, because of the high computational load of graphical simulations, virtual machining is not suitable for the repetitive force simulations that are required for optimizing the design and manufacturing of rotors. In this work, we present a new method that simulates screw milling forces based on the process kinematics instead of graphical simulations. Utilizing mathematical equations that describe the process kinematics, the theoretical rotor profile is determined for feasible combinations of cutting tool profile, setup angle, and centre distance. Subsequently, to find the milling forces, the cutting edge is discretized into multiple small edge segments and a mechanistic cutting force model is used to determine the local cutting forces at each segment. After geometric and kinematic transformations of these local forces, the screw milling forces are obtained for each roughing and finishing pass. Instead of graphics-based methods, the engagement conditions between the cutter and workpiece are determined by the ensemble of 2D rotor and tool profiles; as a result, the computational efficiency is increased substantially. The semi-analytical nature of the presented method allows for computing the forces with arbitrary resolution within a reasonable time. The accuracy and efficiency of the presented method is verified by comparing the simulated forces against a dexel-based virtual machining system. / Graduate

Those who eat share a relationship with design. The Museum of Gastronomy, a museum located at the Washington D.C. National Mall, would dedicate a space to a full-sense experience pursuing a relationship between food, culture, and design. The National Mall is a symbolic setting dedicated to U.S. heritage via museums, memorials, and the honoring of legacies accessible to the public. As the U.S. is a melting pot of different nationalities, this museum would fill an open niche devoted to celebrating the cultural heritage of cooking throughout the cycle of food consumption. As consumers, regardless of notice or intention, we have an intimate relationship with food as means of survival. Cooking, the method for preparing this vital element, is also an expression of culture, style, and use of available resources. In essence, cooking is an everyday design: a crucial aspect of our very survival. Therefore: food → cooking → design → survival → food → cooking Similarly, it is the architect's mission to reach an effective design with available "ingredients," forces, or kit-of-parts within a project. In the Museum of Gastronomy, the architect would become the unifying source between a relationship literally built between food, people, and design in an interactive experience. This would result in a space dedicated to showcasing and combining the concept of "cooking is designing." Incorporating these components into a museum located at the National Mall would personify an experience of the cooking processes as a building block of every-day observation of design. / Master of Architecture

Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.

Thesis (M.S.)--Boston University / PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you. / This thesis is a description of the Armed Forces Radio and Television Service (AFRTS) with an emphasis on its informational and educational aspectso The thesis opens with a history of AFRTS, tracing its development from the early days of World War II through Korea to today's service of over 300 radio and television outlets in all areas of the world where American servicemen are stationed. The concept of operations of AFRTS is also discussed, describing the radio networks and the television distribution systems. Policies governing programming on AFRTS are also discussed in detail. Special emphasis is given to the operating philosophy of AFRTS. This is followed by a description of some of the various kinds of programs available on AFRTS. Examples are used only to indicate the range of programming available to the individual serviceman overseas. Audience reaction to AFRTS by both the American and foreign audience is examined. The American military man overseas finds AFRTS to be an essential serviceo AFRTS is found to serve five major functions for the foreign audience: Emergency Alerting; Taste Setting (fashion and music); English Learning; Source of Credible Information about the United States. This thesis concludes that AFRTS is a potent education force and morale booster for the individual service member, keeping him informed about the world of events and his responsibilities as an American fighting man. / 2999-01-01

This dissertation presents an analytical study of a class of problems involving discontinuities, also referred to as shocks, propagating through one dimensional flexible objects such as strings and rods. The study entails interrogation of the classical balance laws of momentum, angular momentum, and energy across propagating discontinuities. A major part of this dissertation also concerns itself with a non-classical entity called the ``material momentum''. The balance of material momentum is studied in a variational context, where both the local and singular forms of it are derived from an action principle. A distinguishing aspect of discontinuities propagating in continua is that, unlike in the bulk, the balance of momentum and angular momentum are not sufficient to describe their mechanics, even when the discontinuities are energy conserving. In this work, it is shown that the additional information required to close the system of equations at propagating discontinuities can be obtained from the singular form of energy balance across them. This entails splitting of the energy balance by its invariance properties, and identifying the non-invariant and invariant part of the source term with the power input and energy dissipation respectively at the shock. This approach is in contrast with other treatments of such problems in the literature, where additional non-classical concepts such as ``material momentum'' and ``configurational force'' have been invoked. To further our understanding of the connections between the classical and non-classical approaches to problems involving discontinuities, a detailed exposition of the concept of material momentum is presented. The balance and conservation laws associated with material momentum are derived from an action principle. It is shown that the conservation of material momentum is associated with the material symmetry of the continuum, and that the conditions for the conservation of physical and material momentum are independent of each other. A new classification of the deformed configurations of the planar Euler elastica based on conserved quantities associated with the spatial and material symmetry of the rod is proposed. The manifestation of the balance of material momentum in seemingly unrelated fields of research, such as fracture mechanics, ideal fluids, and the mechanics of rods with discontinuities, is also discussed. / Ph. D. / One dimensional flexible bodies such as strings and rods can exhibit fascinating and counterintuitive behavior when they interact with rigid obstacles. For instance, a chain falling on a rigid surface falls faster than it would have if it were falling freely. When one end of a long chain piled up in a container placed at an elevation is pulled across the rim and let go, the chain flows out of the container like a water fountain. Discontinuities in the cross-sectional properties of an elastic rod contained in a curved frictionless channel can result in the generation of forces that propel the rod along the channel. Such counterintuitive phenomena are a consequence of the physics taking place at the point of partial contact where the flexible body comes in contact with a rigid surface. The purpose of this dissertation is to study the mechanics of such points of discontinuity. Several such phenomena where effectively one dimensional bodies interact with rigid surfaces are all around us. A familiar example is the peeling of an adhesive tape, where the peeling front qualifies as a point of discontinuity propagating through the tape as the peeling progresses. A good understanding of the mechanics of the peeling front is crucial in estimating the strength of the adhesive. Another such example of practical importance is a mooring line being placed on the seabed. In such situations, the existence of a reaction force acting at the touchdown point depends on whether or not the cable develops a kink at that point. Similar questions of importance can be asked in the context of deployment and unspooling of space tethers. In this dissertation, an analytical study of the general physics of the phenomena described above is presented. Standard theoretical tools of classical physics are employed to understand the mechanics of points of partial contact between flexible and rigid bodies. The conditions under which a flexible body could experience sharp changes in its geometry (e.g. a kink) at such points are investigated. In addition to that, we explore the implications of a nonclassical law of physics called the balance of “material momentum” in the context of such problems.