Solutions on bearings, gears maintainability problems
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TQ4
1. A signal is sampled at 100 samples/sec. It was later found that the original signal
contained a frequency component at 60 Hz. Calculate the frequency at which the aliasing effect is seen in the power spectrum in the frequency range [0 50] Hz.
2. The stiffness, k, of a linear spring used for vibration damping is 120 lbf/inch. Calculate
the resisting force on the spring for a deflection of 0.2 inch.
3. The drive gear in a gearbox has 32 teeth. It drives a pinion with 16 teeth. The drive
shaft speed is 180 RPM. Calculate the following.
(a) Drive gear shaft speed (Hz)
(a) Tooth mesh frequency (Hz)
(c) Rotational speed of the pinion (Hz)
4. Calculate the belt pass frequency for a belt drive, with a total belt length of 200 inch.
The belt passes over a pulley of diameter 20 inch with a shaft frequency of 1000
RPM. Express your answer in cycles per minute.
5. The ball pass frequency of the outer race (BPFO) in a ball bearing is given by
The following parameters are given: Bd = 8 mm, Pd = 40 mm, θ = 0°.
(a) Simplify the expression for BPFO in terms of Nb and fr.
(b) If Nb = 9 and fr = 30 Hz, calculate the BPFO for this bearing.
(c) What does BPFO indicate if there is a defect in the bearing outer race?
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Solution Summary
The expert selected problems and solutions involving gears, ratios, BPFO, vibrational analysis. A linear spring used for vibration damping is determined.
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TQ4
1. A signal is sampled at f_s=100 samples/sec. It was later found that the original signal
contained a frequency component at f_i=60Hz. Calculate the frequency at which the aliasing effect is seen in the power spectrum in the frequency range [0 50] Hz.
Alias frequencies are determined from
f_a=|f_s-nf_i |, n=1,2,3...
Therefore alias frequencies in the band [0 50] Hz are when
n=1
f_a1=|100-1×60|=40Hz
n=2
f_a2=|100-2×60|=20Hz
2. The stiffness, k, of a linear spring used for vibration damping is 120 lbf/inch. Calculate
the resisting force on the spring for a deflection of 0.2 inch.
The force due to a spring F, of spring constant k, extended by a displacement x is given by Hooke's Law as
F=-kx
Hence on putting in parameter values given
F=-120×0.2=-24lbf
The negative in the ...
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