High speed dynamics of a press feed mechanism: Mathematical simulation and experimental verification.
Item
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Title
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High speed dynamics of a press feed mechanism: Mathematical simulation and experimental verification.
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Identifier
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AAI8820851
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identifier
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8820851
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Creator
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Chassapis, Constantin.
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Contributor
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Adviser: Gerard G. Lowen
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Date
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1988
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Mechanical
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Abstract
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A mathematical model for a lever-type roll feed mechanism, which furnishes favorable comparisons with simultaneously obtained experimental results, is presented. This device, which is used in all manner of power press work, consists of an RSSR spatial linkage with a bent coupler, an indexing-type sprag clutch, a set of feed and pressure rollers which move the metal strip forward, and a disc brake. Its intermittent motion is characterized by four distinct motion regimes. With the exception of the coupler link which is assumed to be elastic, and the sprag clutch which is modeled by a nonlinear torsional spring, all members are considered rigid.;The derivation of the motion equations is based on Hamilton's principle, and the method of Kantorovich is used to reduce the partial differential equations to ordinary ones, which are subsequently solved numerically.;In the experimental set-up, the motion of the mechanism is monitored by three angular encoders. These are attached to the drive shaft, the rocker-link shaft, and the feed-roller shaft, respectively, and their output is stored in a specially designed data acquisition system. Strain gages are attached to the coupler link to determine both in-plane and out-of-plane bending strains.;Experiment and theory, for six different loading conditions, are correlated by way of the following criteria:;In-plane coupler strain traces; the clutch windup angle, which represents the difference between feed roller and rocker rotations, and the total feed length.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
