Vanes for exposure to vibratory loading

Details Vanes for exposure to vibratory loading Vanes for exposure to vibratory loading

2011-03-22

2011-03-22

Kershteyn, Igor (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Specific blade structure

Radial flow devices

C416S061000, C416SDIG004

Reexamination Certificate

active

07909580

ABSTRACT:
Disclosed are methods for designing vanes that, in use, are expected to be exposed to vibratory loading, in particular rotor or stator vanes for aero engines or turbomachinery. A quantitative characteristic (modeshape) is used which is a measure of correlation between the excitation force to which the vane is to be subjected in use and a vibrational mode of the vane, corresponding to a characteristic frequency of the excitation. The modeshape of the first design is determined. Then the first design is modified to give a second design, by one or more of leaning, sweeping or twisting the blade design, or by altering the local shape of the design, or by altering the material of the design. Then the modeshape of the second design is determined. The design modification gives rise to a reduction in the forced response levels.

REFERENCES:
patent: 5537861 (1996-07-01), Seitelman et al.
Sayma et al., Modelling of 3D viscous compressible flows using unstructured hybrid grids, AIAA Journal, 38(b), pp. 945-954, Jun. 2000.
Newland, D.E., Mechanical vibration analysis and computation, Longman Scientific and Technical/Wiley, 1989, ISBN 0-582-02744-b.

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