Critical Speed Using XLRotor Software

[Penguineer]

Has anyone used the XLRotor software to design a drive system for a large industrial belt driven fan? I saw the recommendation for the software from the post below:

thread384-103687

In evaluating the software it appears to be very useful, however I haven't seen anywhere in the tutorials or help files where a sheave and belts can be applied. I am just looking for some input from others who have used/evaluated this software for similar applications. I am working with a 3'L shaft with an overhung fan on one end, a belt driven sheave on the other and two pillow block bearings in between.

Thank you!

 

[electricpete]

Is this something you see in other software? What model is used?

My thoughts - most sofware will not have a specific model for that.
You are modeling the fan only (not the motor) I assume.

I'd think about putting in spring between center of sheave and ground (use a bearing element for that purpose) and varying the stiffness K0 over a range of very low stiffnesses to see if it has significant impact. K0 to be split among Kx = K0*cos(theta) and Ky = K0*sin(theta) where theta is the angle of the belt with respect to horizontal axis.

There are standard test where you tension a belt in static condition by measuring force/deflection of belt pulled perpendicularly at the center of the belt span. With some drawn out calculations involving belt lengths, geometry, and belt factor, I'm almost positive that there is a (non-straightforward) means to convert that into tension of an equivalent spring while running K0. I'd just try with a range of low stiffnesses first and see if it makes any difference.

My two cents, worth what you paid for it…


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(2B)+(2B)' ?

 

[Tmoose]

Is this in the design stage, or do you need the solution to a problem with an existing product?