Mechanical engineering
Example 9.21 In a spring controlled governor of the Hartung type. the lengths of the horizontal and vertical arms of the bell crank lever are 120 mm and 90 mm, respectively The fulcrum of the bell crank lever is at a distance of [20 mm from the axis of rotation of the governor: Each revolving weight is [00 N The stiffness of the spring is 25 N/mm: If the length of each spring is [20 mm when the radius of rotation is 75 mm and the equilibrium speed is 350 rpm; find the free length of the spring: If the radius of rotation increases to 120 mm; what will be the corresponding percentage increase in speed?