torsional and lateral criticals
torsional and lateral criticals
(OP)
Gents,
I do not know the defference between the torsional and lateral critical speeds ? when do we need to consider either? for new draft forced fan, do we need to do such an analysis as recommended by the API? can anybody explain the ifference in a simple way??
I do not know the defference between the torsional and lateral critical speeds ? when do we need to consider either? for new draft forced fan, do we need to do such an analysis as recommended by the API? can anybody explain the ifference in a simple way??





RE: torsional and lateral criticals
In considering torsional vibration, the shaft (or coupling etc) twists (like the stripes of a barber pole).
I don't think there is such a thing as torsional critical speed. There will be a torsional resonant frequency. But just operating the machine at a certain speed does not excite torsional vibration to my knowledge. (maybe someone can explain if I am wrong?).
api 684 = Tutorial on API Standard Paragraphs... An Introi to Train Torsional Analsysis and Rotor Balancing
RE: torsional and lateral criticals
Thnaks for the help, as i do not have API-684, do you know any links i can learn about these frequencies???
this is very important to me as the results for lateral/torsional analysis in one of our gear box indicates that we are running closer to lateral speed??? therfore, i need to learn more about it
thanks for the help
RE: torsional and lateral criticals