critical speed for vertical shaft
critical speed for vertical shaft
(OP)
Hello,
I have a problem as shown in attachment,here a vertical shaft is powered by a motor.
at the top of the shaft a circular disk is fixed weigh approximately 3 kg.
the shaft runs at 3000rpm and motor power is 0.75 hp.
Iam intrested to know the critical speeds within the working rpm range.( first ,second and may be more critical speeds).
i would be obliged if somebody helps out.
regards,
aftab
I have a problem as shown in attachment,here a vertical shaft is powered by a motor.
at the top of the shaft a circular disk is fixed weigh approximately 3 kg.
the shaft runs at 3000rpm and motor power is 0.75 hp.
Iam intrested to know the critical speeds within the working rpm range.( first ,second and may be more critical speeds).
i would be obliged if somebody helps out.
regards,
aftab





RE: critical speed for vertical shaft
If you were only interested in the first bending mode I'd suggest Rayleigh_Ritz, since the mode shape is obvious, but i must admit for the higher order modes I've forgotten how to do it other than FEA.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: critical speed for vertical shaft
thanks sir for useful information.
regards,
aftab