Measuring and testing – Vibration – Resonance – frequency – or amplitude study
Patent
1975-11-17
1977-12-06
Gill, James J.
Measuring and testing
Vibration
Resonance, frequency, or amplitude study
73664, 2351513, 364512, 364579, 364724, 364806, 364826, G01M 700
Patent
active
040610179
ABSTRACT:
A system for determining the modal characteristics of a structure in which a plurality of driving signals which have a common preselected frequency and a preselected set of amplitudes and phases corresponding to the estimated parameters of a mode of interest are applied to the structure. The common preselected frequency is in general a complex frequency. The response of the structure to the driving signals are then sensed. Means are provided for receiving the driving signals and the sensed responses, for generating a set of transfer functions characteristic of the structure corresponding to the mode of interest and for obtaining from such set of transfer functions improved estimates of the complex frequencies and complex residues of the mode of interest, that is the damping, frequency, magnitudes and phases of the mode of interest. By varying the preselected frequency and preselected set of amplitudes and phases to correspond to each mode in the structure, all of the modes in the structure and the shapes thereof are determined.
REFERENCES:
patent: 3015949 (1962-01-01), Arnold
patent: 3654804 (1972-04-01), Helmuth
patent: 3718813 (1973-02-01), Williams et al.
patent: 3751994 (1973-08-01), Gross
patent: 3973112 (1976-08-01), Sloane
McKeever Bruce T.
Sloane Edwin A.
Gill James J.
Time Data Corporation
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