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Jordanskiz1-Visitor
1-Visitor
June 25, 2014
Question

Torque and centrifugal loads

  • June 25, 2014
  • 3 replies
  • 1582 views

Hi,

I want to simulate an air plug which makes the distribution in a motor.

This plug is in the cylinder head and two bearings at each end hold it in place.

Thanks to a chain on a sprocket at one end, the part rotates at 4000 rpm. So I add a centrifugal load on the whole part.

The chain does not rotate everytimes at the same speed and due to the inertia of the part, the chain creates a torque at one end of the part.Capture.PNG

I put two pin constraints and two planar constraints at each end to simulate the bearing and I add the torque on the right end (460 Nm).

But I need to block the last degree of freedom (the rotation on the central axle of the part) otherwise I can not do a simulation...

I don't know what to block because in the reality the part is not blocked...

Can you please help me ?

Thanks,

Jordan


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3 replies

J
JonathanHodgson13-Aquamarine
13-Aquamarine
June 25, 2014

If I understand this correctly, the component isn't transmitting any torque - it's just being twisted against its own inertia, presumably backwards and forwards at some fairly high frequency.

If you look at the centrifugal load it also has a section for angular acceleration. If you replace your torque load with a rotational constraint, and instead apply an acceleration load, does that do what you want?

G
gkoch2-Explorer
2-Explorer
July 3, 2014

Hello Jordan, did Jonathan's suggestion help or maybe Steven's detail questions gave you an idea, so you could solve the task? Gunter

S
SylvainA.1-Visitor
1-Visitor
July 18, 2014

Hello,

you write: "due to the inertia of the part, the chain creates a torque at one end of the part"

It is only true during acceleration/deceleration.

At fixed velocity, one doesn't care about inertia of the part.

During constant-speed rotation, the motor torque will be due to frictions or a torque load applied on this part.

In theory, if you apply a constant torque on a part that is frictionless, it will endlessly accelerate.

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