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. -
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
- (i) mass of each rotating of ball. - (ii) spring stiffness. - (iii) initial compression of the spring. -

Mumbai University > MECH > Sem 5 > Theory Of Machines 2

Marks: 12 M

Year: May 2015

Given:

w= 360 rpm

m = 5kg

F = 35N

X= 30mm

To find:

M, K and x1

$$\text{Fig: Hartell governer considering only the left side.}$$

1. Mass

   It is said that 1% change in speed can overcome friction of 35N. In this case only friction will be balanced and not …