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Mechanical Engineering Commons

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Full-Text Articles in Mechanical Engineering

Spatial Mechanism Design In Virtual Reality With Networking, John N. Kihonge, Pierre M. Larochelle, Judy M. Vance Aug 2002

Spatial Mechanism Design In Virtual Reality With Networking, John N. Kihonge, Pierre M. Larochelle, Judy M. Vance

Mechanical Engineering Publications

Mechanisms are used in many devices to move a rigid body through a finite sequence of prescribed locations. The most commonly used mechanisms are four-bar planar mechanisms that move an object in one plane in space. Spatial mechanisms allow motion in three-dimensions (3D), however, to date they are rarely implemented in industry in great part due to the inherent visualization and design challenges involved. Nevertheless, they do provide promise as a practical solution to spatial motion generation and therefore remain an active area of research. Spatial 4C mechanisms are two degree-of-freedom kinematic closed-chains consisting of four rigid links simply connected ...


Interactive Virtual Tools For Manipulating Nurbs Surfaces In A Virtual Environment, Brian P. Perles, Judy M. Vance May 2002

Interactive Virtual Tools For Manipulating Nurbs Surfaces In A Virtual Environment, Brian P. Perles, Judy M. Vance

Mechanical Engineering Publications

DN-Edit is a virtual environment developed to allow the manipulation of non-uniform rational b-spline (NURBS) surfaces using virtual shaping tools. NURBS have become the industry standard for representation of free-form curves and surfaces. The contribution of the work presented here is in the development of shaping tools which are used to operate directly on the NURBS data and change the shape of the surfaces in a virtual environment. These shaping tools allow surface manipulations to be made using methods that match the shaping of real malleable objects. The virtual shaping tools are threedimensional shapes that are controlled through a six ...


Bubble Size In A Cocurrent Fiber Slurry, Theodore J. Heindel Feb 2002

Bubble Size In A Cocurrent Fiber Slurry, Theodore J. Heindel

Mechanical Engineering Publications

Bubble diameter measurements in a two-dimensional cocurrent bubble column are obtained using a gas−liquid−solid system in which the solid component is a cellulose fiber. Flash X-ray radiography, a noninvasive measurement technique, is used to record bubble size in the opaque slurry at various operating conditions. Results are presented for a range of fiber mass fractions (0 ≤ C ≤ 1.5%), a range of superficial gas velocities (1 ≤ υg ≤ 4 cm/s), two superficial liquid velocities (υl = 1 or 2 cm/s), and two column heights (H = 15−40 or 115−140 cm). Bubbles are categorized as either large (d ...