PearlRock
Aerospace
- Apr 22, 2010
- 25
Dear all,
I am designing a flexible spline for an experimental application. I'm looking at ANSI B92.2M in the machinery guide. My root stresses appear to be too high. I am using the maximum effective length and my maximum diameter is restricted. If I could choose a larger diameter, this wouldn't be a problem. Unfortunately, I cannot. Beyond spline length and diameter, the root stress calculations are mostly stress factors, so proper spline design dictates I understand my stress factors quite well.
I've been looking at the spline application factor (Ka) table. My application is technically an electric motor connected to a dynamometer; however, this particular motor has horrible torque ripple. 400Nm peak; 250Nm avg at low speed. That makes my application factor very selection difficult, because is this application like a "normal" electric motor, or a "normal" internal combustion engine? Does torque ripple even matter for the selection of this stress factor? The difference in the application factor is quite significant....1.2 vs 2+. If I can use the lower value, my spline design is fine. If I cannot use a lower application factor, well....I'm not sure what I can do.
Is there any value in using a spline length longer than the maximum effective length?
Best regards
I am designing a flexible spline for an experimental application. I'm looking at ANSI B92.2M in the machinery guide. My root stresses appear to be too high. I am using the maximum effective length and my maximum diameter is restricted. If I could choose a larger diameter, this wouldn't be a problem. Unfortunately, I cannot. Beyond spline length and diameter, the root stress calculations are mostly stress factors, so proper spline design dictates I understand my stress factors quite well.
I've been looking at the spline application factor (Ka) table. My application is technically an electric motor connected to a dynamometer; however, this particular motor has horrible torque ripple. 400Nm peak; 250Nm avg at low speed. That makes my application factor very selection difficult, because is this application like a "normal" electric motor, or a "normal" internal combustion engine? Does torque ripple even matter for the selection of this stress factor? The difference in the application factor is quite significant....1.2 vs 2+. If I can use the lower value, my spline design is fine. If I cannot use a lower application factor, well....I'm not sure what I can do.
Is there any value in using a spline length longer than the maximum effective length?
Best regards