Diagnostic device, diagnostic method, and diagnostic program

Abstract

To provide a diagnosis device, a diagnosis method, and a diagnosis program capable of obtaining about the same diagnosis precision as that of a diagnosis using a hammering sound without any contact.SOLUTION: A diagnosis device includes an excitation section, a sound volume indication section, a first sound reception section, a second sound reception section, an impulse response calculation section, a correlation analysis section, a differential analysis section, and a diagnosis section. The impulse response calculation section calculates an impulse response based on output of the first sound reception section and the second sound reception section when an excitation sound is radiated from the excitation section with reference sound volume and evaluation sound volume. The correlation analysis section calculates a correlation transfer function between second reference characteristics and second evaluation characteristics based on an impulse response. The difference analysis section calculates a difference between first evaluation characteristics and first reference characteristics based on an impulse response on the basis of a correlation transfer function. The diagnosis section diagnoses a measurement object on the basis of the difference, and features in which sound volume of a vibration radiation sound is shifted to a dead zone, a rising area, a linear area, and a saturation zone in this order following a change in the sound volume of an excitation sound.SELECTED DRAWING: Figure 3

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