Lab mannaul



Download 286.02 Kb.
Page4/11
Date29.04.2021
Size286.02 Kb.
1   2   3   4   5   6   7   8   9   10   11
1. Controlling force , Fc1 = m.ꞷ12.r1Newton. where, m = total mass of balls - 0.5 Kg.

2. Sensitiveness :- It is the ratio of difference

between the maximum and minimum . equilibrium speed to mean equilibrium

speed.

Practically, from no load to full load operation of the engine, a definite



, movement of fuel control element (throttle or fuel pump) is required.

If x1 is sleeve position at no load (upper position), and x2 is sleeve position at full load,

(lower position) then speeds corresponding to these positions, N1 & N2 are maximum

and minimum equilibrium speeds. Thus , sensitiveness of governor can be determined

for any two positions of sleeve, x1 and x2.



Sensitiveness = 2 {(N1 – N2)/ ( N1 + N2 )}.



This is sensitiveness between sleeve positions x1 and x2.
3. Governor Effort :- It is the mean force required on the sleeve to raise or lower it for given

charge in the speed. For convenience, in comparing different types of governors, it is usual

to define the effort which will be applied for 1% change of speed.

If, c = percentage increment of speed (expressed as fraction).

Governor effort, Q = (W + w).c Newton.
4. Governor power :- It is the work done at the sleeve for a given change of speed.

Governor power, P = Q . x1 N-m



2 ) Proell Governor :-



Data


    1. Length of links, 1 = 0.130 m.

    2. height of’ vertical ball arm, a = 0.070 m

    3. Ang1c between vertical ball arm and lower link – 1500.

Mass of sleeve and balls, initial radius of rotation and distance between top

and bottom link are same as Porter governor.

CALCULATIONS :-

Radius of rotation at speed N1,

r1 = 0.05 + s1 + d1mtr.

Now, finding C1 similar to Porter governor, at speed N1.

Applying pythagores theorem
S1 =

Ѳ = tan-1 (C1 / S1 )

As total included angle of link EFH is 1500

Ѳ1 + α + 90 = 150

α1 = (60 – P1)2

d1 = a sin α1.

= 0.07 sin α1

∴ r1 = (0.05 + S1 + d1).

Similar to Porter governor

1. Controlling force, Fc = m. ꞷ12. r1 Newton. ----------- (m = ______kg)


Download 286.02 Kb.

Share with your friends:
1   2   3   4   5   6   7   8   9   10   11




The database is protected by copyright ©ininet.org 2020
send message

    Main page