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Post by Br. Marius on Mar 31, 2015 13:28:22 GMT
For a uniform hingeless rotor, a thin flexure was incorporated near the root end (at 4% of blade radius) and the blade lagged about this flexure. At the operating speed of 360 RPM, the rotating lag frequency and damping ratio were determined to be 2.4 Hz and 2%. If the rotation speed is increased to 540 RPM, determine the new rotating lag frequency and damping ratio.
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Post by Br. Marius on Apr 1, 2015 19:00:14 GMT
\(\nu_{\zeta2}=0.06/rev\) \(\zeta_2=2.2%\) Work is attached. Attachments:HW7-2.docx (20.76 KB)
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Deleted
Deleted Member
Posts: 0
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Post by Deleted on Apr 1, 2015 22:13:40 GMT
So your methodology is correct, but I think I see a mistake in equation (4). I don't think you squared \(\Omega_1\) in the actual evaluation.
But if it is, I get:
\(\nu_{\zeta_2} = 0.323 /rev\)
and
\(\zeta_2 = 1.65\%\)
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