Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1996-04-15
1997-11-11
Williams, Hezron E.
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
73602, 364550, 36455101, G01H 1300
Patent
active
056866674
ABSTRACT:
A method for determining the approximate resonance frequency of a structure urrounded by a compressible fluid includes the steps of: (1) performing analysis to determine in-vacuo frequencies and mode shapes of the structure; (2) selecting an in-vacuo mode of interest, (3) computing an influence matrix at the eigenfrequency of the selected mode of interest; (4) combining the computed influence matrix with structural stiffness and mass matrices from a finite element program, and using the modified matrices computing eigenvalues of the structure, including eigenvectors; (5) selecting from the computed eigenvectors a computed mode having substantially the same displaced shape as the in-vacuo mode of interest; (6) determining the eigenfrequency of the selected computed mode; (7) determining any difference between the computed eigenfrequency of the selected computed mode and the in-vacuo eigenfrequency of the selected in-vacuo mode of interest. The process iteratively returns to step (3) until the eigenvalues of the selected computed mode of step (5) and the in-vacuo eigenvalue substantially converge.
REFERENCES:
patent: 4061017 (1977-12-01), Sloane et al.
patent: 4341111 (1982-07-01), Husar
patent: 4926691 (1990-05-01), Franklin et al.
patent: 5327358 (1994-07-01), Stubbs
patent: 5493511 (1996-02-01), Wincheski et al.
McCollum Michele D.
Siders Clementina M.
Ashraf Nashmiya
Lall Prithvi C.
McGowan Michael J.
Oglo Michael F.
The United States of America as represented by the Secretary of
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