Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 15, Problem 19RQ
A motor is operating a load that requires a torque of 750 lb–in and is turning at a speed of 1,575 RPM. How much horsepower is the motor producing?
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Q2(15 Marks): From Fig. 2, Determine
(a) mass equivalent in term x2, (b)
stiffness equivalent in term x2, and (c) the
natural frequency for the system in term
x2. Note: (1) J Cylinder =
mcr?
J link
(2)
2
3
Pulley, mass moment of
inertia J
Rigid link 1 (mass m₁),
rotates with pulley.
about O
Cylinder, mass m
Adherence to the symbols as in the question
152 153
xx(1)
Fig. (2)
m
k₁
nimmunizmu
Rigid link 2 (mass m₂)
Q3-B (7 Marks): A mass (m) is suspended from a spring of stiffness 4000 N/m and is
subjected to a harmonic force having an amplitude of 100 N and a frequency of 5 Hz. The
amplitude of the forced motion of the mass is observed to be 20 mm. Find the value of mass
(m).
Fig. (2)
Q3-A (8 Marks): An automobile is modeled as a single-degree-of-freedom system vibrating in
the vertical direction. It is driven along a road whose elevation varies sinusoidally. The
distance from peak to trough is 0.2 m and the distance along the road between the peaks is 35
m. If the natural frequency of the automobile is 2 Hz and the damping ratio of the shock
absorbers is 0.15, determine the amplitude of vibration of the automobile at a speed of 60
km/hour
6.18
Chapter 15 Solutions
Electrical Transformers and Rotating Machines
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