Gyroscopic forces
Gyroscopic forces
(OP)
I have a calculation problem I need some help with. I have a cooler fan which is rotating with a speed of 1000 rpm, the axis of rotation is horizontal. The whole cooler is also rotating with a speed of 1 rpm around a vertical axis. The fan is supported on one end only. I need to calculate gyroscopic forces on the bearing/axle, I suspect it is quite simple, but I have never done such a calculation before. Anyone who has? :)
Distance fan-bearing: 0,1 m
Moment of intertia, fan: 0,639 kgm2
Distance fan-bearing: 0,1 m
Moment of intertia, fan: 0,639 kgm2





RE: Gyroscopic forces
RE: Gyroscopic forces
RE: Gyroscopic forces
2) Did you do a Google (or other Internet search engine) search on the words "gyroscopic force formula?"
3) Did you know that if you had done #2, you would have had your answer several hours ago and you wouldn't have bothered posting here, much less posting twice.
4) Hint, does the moment of inertia times the angualar momentum ring a bell?
RE: Gyroscopic forces
gyroscopic torque about y axis
Now equate this to external torques including gravityinduced.
From equilibrium equation
Ty+bearing torque +mgx=0
you get your answer.
I moment of inertia of spinning assembly
w = angular velocity of fan
d(theta)/dt rate of precession rotation about z axis
Ty gyroscopic torque
x distance CM to bearings
mgx moment due to gravity
RE: Gyroscopic forces
A.
RE: Gyroscopic forces
FYI, it was I who redflagged my own post since I had no way of deleting it.