Why Does MSC Adams Show Increasing Acceleration with Constant Torque?

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SUMMARY

The discussion centers on the behavior of a simple annulus in MSC Adams when subjected to a constant torque of 100,000 Nmm and an inertia of 124.9 kgmm². Users expect the acceleration to be calculated as torque divided by inertia (T/I), but they observe continuously increasing velocity and acceleration during simulations. The discrepancy arises from the absence of friction and air resistance in the model, which are critical factors that limit angular velocity in real-world scenarios. Thus, without these damping factors, the simulation reflects an idealized condition where acceleration appears unbounded.

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Mechanical engineers, simulation analysts, and students studying dynamics who are interested in understanding the implications of idealized versus real-world conditions in rotational motion simulations.

bugatti79
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Hi Guys,
I have a simple annulus of radius 25mm and 15mm of length 50mm where i applieD a torque of T=100000Nmm. Its inertia about its main axis is I=124.9 kgmm2.
Therefore i expect the acceleration to be T/I.
Its not clear how to confirm this answer in Msc Adams because when i set simulation time of 0.1 or 1 sec I always get increasing velocity/acceleration.
What am I missing?

Regards
B
 
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If you apply a fixed value torque to an object with a fixed value polar moment of inertia then it will just keep on accelerating forever ?
 
Then under what conditions does this Torque =inertia times alpha hold that one typically sees in textbooks?
 
Nothing wrong with the expression .

What is angular velocity of object after time t ? Assume zero initial velocity .
 
+1

In practice things like friction, air resistance, strength of materials limit the angular velocity but if you don't model those then the angular velocity is unlimited.
 
bugatti79 said:
Therefore i expect the acceleration to be T/I.
Its not clear how to confirm this answer in Msc Adams because when i set simulation time of 0.1 or 1 sec I always get increasing velocity/acceleration.

Does the acceleration you get in Msc Adams agree with the calculated value?
 

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