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Driveshafts
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Order Number
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Title
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Author
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Date
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Flexible Coupling Driveshaft Systems For Cooling Towers (TP-98A)
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Fred K. Landon, Koppers Company, Inc.
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1972
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Abstract:
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Thermal Expansion Problems With Long Single Piece Fan Drive Shafts (TP-85-20)
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C.W. Hendrickson, Rexnord Mechanical Power Division, D.A. Fairbanks & G.R.
Kleman, Southwestern Public Service
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1985
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Abstract:
The use of larger and more efficient mechanically induced draft
cooling tower fans has given rise to the use of long single
piece fan gearbox input shafts. This type of shaft replaces the
maintenance nuisance of intermediate shaft bearings with
potential thermal expansion problems. This paper discusses some
of these problems and their circumvention.
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Composite Driveshafts in Cooling Towers (TP-88-06)
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Dr. K.R. Berg, ASEA Composites, Inc.
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1988
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Abstract:
The use of fiber-reinforced epoxy driveshafts dates back to
1969. However, the high price of carbon fiber at that time
precluded industrial applications. Today, after 18 years of
intense development and production, the price of carbon fiber
permits competitive pricing for driveshafts of composite
materials. The paper presents the whys and wherefores of
composite materials applied to cooling tower driveshafts. Also
presented is the status of composite driveshafts in other
applications.
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Design and Application of Composite Cooling Tower Couplings (TP-89-08)
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Brian S. Spencer, Addax, Inc.
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1989
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Abstract:
This paper discusses the design and application of composite
cooling tower couplings. Couplings are now available in both
composite spacers and composite flexible elements. The composite
spacers have proven their effectiveness through two years of
service. The flexible coupling has been recently introduced
after completing laboratory testing. The one-piece composite
flexible element provides up to 5 degrees misalignment at a very
low misalignment moment. The element also offers corrosion
resistance, lightweight and a virtual infinite fatigue life.
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Composite Couplings for Cooling Towers (TP-91-11)
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Dennis Van Laarhoven, Consultant
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1991
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Abstract:
Many cooling tower designs now require special consideration to
reduce their impact on the environment and facilitate site
permitting. Unique designs will be discussed including: low
noise applications; injectional scrubbed flue gas into natural
draft cooling towers; drift requirements as low as .0001%; new
EPA testing methods, environmentally critical thermal
performance; removal, redesign and replacement of asbestos
products with alternate materials; water conservation; zero
discharge towers and elimination of plume through the use of a
wet/dry cooling tower.
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Mechanical Damage Caused by EMF Generated from Fast Bus Reclosure
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James T. Heard, Addax, Inc.
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1997
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Abstract:
Energy conservation considerations have led to the increasing use of
two speed motors and variable frequency drives for mechanical draft
cooling towers. While this practice has resulted in improved
efficiency, its proper application has several hidden pitfalls that
must be considered when specifying the motor control and mechanical
components in the system. The potential damage tooth electric motors
and the connected equipment that is caused by fast switching or fast
bus reclosure can be quite extensive. This paper discusses the details
of motor reaction to fast switching, illustrates damage caused to
mechanical components and recommends prevention.
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Natural Frequency Characteristics of Drive Shafts
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Robert Poling, Amarillo Gear Company
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2005
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Abstract:
For rotating machinery utilizing drive shafts, it is important to
operate at a speed sufficiently lower than the drive shaft's
natural frequency to prevent destructive vibration. In this paper, the
theory of determining the shaft's natural frequency is presented
as well as methods for empirically testing a shaft's natural
frequency. Vibrations levels in the region of the natural frequency
are empirically determined for composite drive shafts and multiple
test methods for determining the natural frequency are described and
compared. The effect of the end conditions is discussed and an
appropriate end condition is presented, and finally, the effect on
natural frequency when a torque is applied to the composite shaft if
presented.
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