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Post by Br. Marius on Mar 31, 2015 13:31:58 GMT
For a tracked 4-bladed rotor, a large 7/rev flap bending moment \(N_F\) was observed from the strain gages attached at the root of one of the blades.
\(N_F=-N_0cos(7\psi)\)
Calculate the oscillatory roll hub moment transmitted to the airframe.
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Post by Br. Marius on Apr 1, 2015 19:02:44 GMT
\(L_{1s}=-2N_0sin(8\psi)\) with the thought that I shouldn't have to correct for sign because positive rotor motion and positive roll are in the same direction.
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Deleted
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Post by Deleted on Apr 1, 2015 21:58:18 GMT
Alright, I agree with the right hand side, but what's \(L_1s\) ? Shouldn't it just be \(M_x\) ?
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Post by Br. Marius on Apr 3, 2015 14:56:36 GMT
They are equivalent. I put "1s" out of habit and it should be erased, but "L" is the convention I used to use for rolling moment.
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Post by matthorr on Apr 5, 2015 1:04:36 GMT
L is used for the overall rolling moment of the airframe about the \(x_B\) body axis in the Euler equations. \(M_x\) would be the moment from the rotor (just one component of L).
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Post by Br. Marius on Apr 5, 2015 19:53:34 GMT
Got it--sounds good. Thanks!
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