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مکانیک::
درجه موتور
Low engine order excitations are generally the result, with force magnitude reducing for increased orders.
Placing frequencies of integral order vibration in the low engine orders (2E, 3E, and occasionally 4E and 5E) outside the operating range or at low shaft speeds finds favor among many gas turbine manufacturers.
Higher engine order resonance reaching in the 30 to 40E may also need scrutiny if excitation is of sufficient strength and blade damping is inadequate.
where k describes the engine order, i indicates the number of considered mode shapes and
In the twin finite element models excitation loads of each engine order k must be imposed simultane- ously on node l of the real and imaginary blade
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