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مکانیک::
فرکانس های ویژه
Rewriting the Euler function in trigonometric notation, eigen frequencies of the cyclic finite element model can be computed in the real domain.
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.
For the given value of , eigen frequencies of the bladed disk may then be computed.
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
Intersections between the excitation bands and eigen frequencies, defining possible reso- nance conditions may be identified with the aid of a Campbell diagram in combination with the nodal diameter diagram shown in Fig. 8.10, where the sixth order is chosen for illus- tration.
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