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The arms of Hartnell governor are of equal length. When the sleeve is in the mid position, the masses rotate in a circle with diameter of 150mm (the arms are vertical in the mid position). Neglecting friction, the equilibrium speed for this position is 360rpm. Maximum variation/ of speed taking friction into account, is to be 6% of the midposition speed for a maximum sleeve movement of 30mm. The sleeve mass is 5kg and the friction of sleeve is 35N.
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Assuming that the power of the governor is sufficient to overcome the friction by 1% change of speed on each side of mean position. Find (neglecting obliquity effects of the arms), the
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(i) mass of each rotating of ball.
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(ii) spring stiffness.
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(iii) initial compression of the spring.
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Mumbai University > MECH > Sem 5 > Theory Of Machines 2
Marks: 12 M
Year: May 2015