In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be
A. Double
B. Four times
C. Eight times
D. Sixteen times
Answer: Option A
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Consider an annular strip of radius r and width dr.
F = Aμ (du/dy) = A μ(u/y)
u = 2πrN/60, y = h, A = 2πr dr y=h=clearance
Torque = Force * radius.
dT = 2πr dr μ(2πrN/60h)r.
dT proportional to N.
Consider an annular strip of radius r and width dr.
F = Aμ (du/dy) = A μ(u/y)
u = 2πrN/60, y = h, A = 2πr dr y=h=clearance
Torque = Force * radius.
dT = 2πr dr μ(2πrN/60h)r.
dT proportional to N.