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مکانیک::
قطر گره
The nodal diameter n assumes values 0, 1, 2, . . . up to N/2 for even N and (N 1)/2 for odd N.
[K] represent complex inertia and nonlinear stiffness matrices with respect to the rotational speed and depend on the nodal diameter n.
For each mode i and nodal diameter n (n 0 to N/2), two identical eigen frequencies are computed, which refer to two possible mode shapes of the bladed disk assembly.
After applying the computed eigen frequencies i,n and mode shapes i,n, the steady response of the disk is given for each nodal diameter n in the rotating frame as
(8.13), the disk assembly oscillating at nodal diameter n is in resonance if the excitation order k
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