Generating Resonance Spectra

Resonance analysis is based on the principle that the admittance or impedance of a specimen is determined by the elastic, piezoelectric, and dielectric properties of the material. By adjusting these properties so that the predicted impedance or admittance matches the measured impedance or admittance of the specimen as a function of frequency, the properties can be determined. By the same method, the resonance spectrum expected for a given set of material properties can be generated.

PRAP allows the user to either generate a new resonance file from known material properties for any of the resonance modes supported by the program. A generated spectrum can also be added to an existing resonance spectrum, displayed as the material property fit.

To generate a resonance spectrum;

Select the 'Generate Spectrum' command from the File menu.
Select the resonance mode to be generated. The options available depend on the geometry of the sample selected.
If a resonance scan window is open within PRAP, the 'Use Current Resonance Scan' option is available. Selecting this option will use the sample and measurement settings of the open resonance scan and the generated spectrum will be inserted into this open window as the fit to the material property results.
If the 'Use Current Resonance Scan' option is not selected, the sample dimensions, density, and geometry must be specified, as well as other measurement properties of the generated scan.
The resulting generated spectrum can then be manipulated as any other resonance spectrum.

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