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مکانیک::
دیسک پره دار
The calculation of blade resonant frequencies and mode shapes of a bladed disk system calls for the definition of boundary conditions at shroud and dovetail interfaces.
Figure 8.2 shows bladed disk assemblies for a steam turbine rotor, and Fig. 8.3 provides examples of new steam turbine buckets.
In this regard, note that when complete assem- blies of bladed disks are analyzed and tested in an engine or in a rig, the amount of data to be evaluated is considerably more.
Low-cycle fatigue has been a primary design consideration for bladed disk assemblies, and this has succeeded in controlling LCF-related failures to a considerable extent.
Coupling between the two numerical methods is achieved by a Fourier decomposition (amplitude Pk and phase delay k) of the time-resolved excitation forces F(t) acting on the rotating bladed disk.
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