Would you say then that damping is a "driver" of behavior, or a "reaction" to it? What I mean is, how would the phase lag created by damping so ideally correlate with the rotor-bearing system critical speed to produce the right phase lag angle at the right speed, and bring the rotor to a...
Thanks for the reply. By the way, where you said...
Does mean that the shaft naturally "self-balances" any sudden unbalance change if it happens when the speed is above the critical, in the same way as an integrated unbalance "self-centers" as it passes through the critical from 0 to 180...
So, I'm trying to study phase shift in an unbalanced rotating system (where "phase shift" means the resulting response of orbital motion lags behind in time/position relative to the force that's causing it)
I know that conservation of angular momentum applies ideally in a closed system...
"Suppose you are drilling a hole at one end of a long board. If the drill suddenly jams, the board will start to swing around and the drill will want to swing with it. That is the force on the pivot point of the drill. "
That's an interesting example of a similar situation... where here the...
Thanks, but it doesn't quite answer what I'm looking for.
The parallel axis theorem will tell me the higher total moment inertia I might have from rotation centered away from the cg, which of course will require more torque to equivalently accelerate to a given angular velocity.
But I'm...
Assume that the arbitrary-shape object shown has a torque applied at the black X with a circle, and is free to rotate about the X axis. Assume that the object is also constrained by a pin at this torque input point, parallel to the X-axis. The CG of the object is the blue plus sign, and there...
Relating to the synchronous nature of the moon’s rotation and orbit around the earth, what would happen if the orbital radius of the moon were slightly increased?
I want to ignore tidal locking or gravitational gradient, and just look at it from an angular momentum perspective.
Would...
"Sorry, I don't see the problem. If you remove the fixed axis, I would switch the description of the system to avoid additional terms popping up in the calculation (fictional forces if you keep the original axis of rotation, or a rotating coordinate system if you take the axis through the center...
"Does the physical manifestation of the conservation of angular momentum have a time constant or time lag in its action?
"?
Without external forces, angular momentum around every axis is conserved. It is the same for every point in time."
What I was wondering is this... For example, say...
"You can always write an arbitrary motion as sum of a translation and a rotation around an arbitrary axis (not the direction, but the position)"
Thanks for the reply, but I’m not sure that clarifies it for me. Maybe I’ll ask another way…
How would you represent the natural tendency of a...
Hello all. I'm a newer engineer in rotor dynamics trying to better understand some things, so perhaps someone can provide some insight...
First, I'm trying to better understand the physics of forced, non-centroidal rotation (for a spinning cylinder in particular). Non-centroidal rotation...