Sensitiveness of Governor
Sensitiveness of Governor
A governor is said to be sensitive when it readily responds to a small change in speed.
Sensitiveness = range of speed/ mean speed = N2 – N1/N
Sensitiveness = 2 (N2-N1)/ N1+N2
when
N= Mean speed
N1 = Minimum speed corresponding to full load conditions
N2 = Maximum speed corresponding to no-load conditions
Hunting
Sensitiveness of a governor is a desirable quality. However, if a governor is too sensitive, it may fluctuate continuously. This phenomenon of this fluctuation is pronounced as hunting.
Isochronism
A governor with sensitivity equal to infinity is treated as isochronous governor. For all position of sleeves all position of sleeves, governor has same speed.
Stability
A governor is said to be stable if it brings the speed of the engine to the required value and there is not much hunting. The ball masses, occupy a definite position for each speed of the engine within the working range.
The stability and the sensitivity are two opposite characteristics.
Effort of Governor
The effort of the governor is the mean mean force acting on the sleeve to raise or lower it for a given change At constant speed, the governor is in equilibrium and the resultant force acting on the sleeve is zero. However, when the speed of the governor increases or decreases, a force is exerted on the sleeve which tends to move it. When the sleeve occupies a new steady position, the resultant force acting on it again becomes zero.
Power of Governor
The power of a governor is the work done at the sleeve for a given percentage change of speed.
Power Effort of governor displacement of sleeve
Controlling Force
Controlling force is equal and opposite to the centrifugal force and acts radially inwards. It is supplied by
- Gravity of mass of ball in case of watt governor.
- Gravity of mass of ball and dead weight of sleeve in case of porter and proell governor.
- Gravity of ball masses and spring force in Hartnell and Hartung governors.
- Controlling force curve for spring-loaded governor.
Where, A, B > 0
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