PTC Creo Simulate has a functionality called Measures where I can setup a point in the CAD model and ask the software to give me Stress_XX or Von Mises stress or displacement etc at that point. In the output file these value(s) are recorded. It is like the Probe functionality in Autodesk Nastran...
BobM3,
I am doing a static analysis. My dilemma is that during the start up the torque loads are due to
1. The friction in the bearing
2. The inertia
3. Reaction torque
or all of these combined?
The output torque on the reducer is 18 times higher than the motor torque. When I apply this torque...
BobM3,
The output shaft of the reducer box is driving the conveyor belt shown in the sketch as a big red circle. The motor shaft supplies power to the reducer. Thanks
I have attached a more detailed sketch which shows how the reducer box, coupling box and the motor are configured. The output shaft of the reducer box drives a conveyor belt. My primary concern is the stresses in the reducer box housing. My loads in the static analysis include the weight of the...
FeX32,
"...Then, you can approximate the polar mass moment of inertia of the rotating parts".
I think you mean polar MI of the ALL rotating parts gears, shaft + the box and the over hanging motor which I did not show in the sketch. The motor is over-hanging to the right of the vertical support...
feajob,
The parts I design, analyze and calibrate are wind tunnel force tranducers. The analysis is done on a part while the calibration is done with a assembly. The transducers have multiple load paths and have forces and moments applied in multiple directions. The material is typically steel...
EdDanzer and FeX32,
Thanks for the reply. Does that mean I need to apply not the frictional torque of 5% but the total torque(or more)? Initially I had applied the total torque on the inner surface of the reducer box through which the output shaft goes. The stresses went sky-high but there is a...
I do this type of comparison all the time and I have found the results to be with in 5% and sometimes with in 1%. I think the trick is not so much in the FEA but in the strain gaging. Make sure your placement is very PRECISE in terms of location and direction of the grid.
HTH
Thanks FeX32,
In the static analysis I went back and included 5% of the torque to account for the friction during startup. The reason I did this is, suppose there were no support at the other end and the entire reducer box is free to rotate about the output shaft. During startup when the...
There is a reducer box whose output shaft drives a conveyor belt. The outrput shaft is off-center (closer to one of the short sides of the rectanglular face of the reducer box). The other end of the reducer box is supported by a vertical rod that is bolted into the ground. I am doing stress...
This might be a very simple question. I want to know if ANY relatation exists at all between two arrays. A correlation I read determines only if a linear relationship exists. Please correct me if I am wrong about this. I can plot the data in excel and try all the fitting functions and check the...
GBor,
I found some vague reference for the shock factor as between 2 and 3. I am not sure how much I can trust it. Attaced is a sketch showing my stress analysis methodology. Please let me know if I am missing something. I want to use the shock factor to the resultant moment shown in the image...
Thanks GBor,
I am using pro/mechanica linear static analysis, do not have the advance version. I am trying to apply the shock load as a static load as a work around. Please guide me as to how I can calculate the magnitude of this inertia loading and is it fair to do so in the absence of...
A rectangular block has a rod attached off-center. At the end of the rod there is a weight. The rectangular block is vibrating about a small angle. The axis of rotation is through the center of the rectangular block and parallel to the axis of the rod. In my simulation I have applied the weight...
