In this newsletter, we will introduce the Fluctuation Sound Analysis Function OS-0526, the optional function of O-Solution. This system will help to quantify the characteristics of various temporal fluctuations that were difficult to detect with conventional FFT, basic roughness or fluctuation strength.
Although the magnitude of the sound is not so large, there are many “unpleasant sound” in the world. For example, “rattling” and “humming“ sounds generated from interior items while driving a car, or abnormal sounds such as “buzzing“ sounds that can be heard in the rotation sound of a small motor, etc. Sounds with significant temporal fluctuation often feel unpleasant even the magnitude of sound (level) is not so large. The fluctuation sound analysis is the analysis that can extract only the components with large time fluctuation that are not affected by the level.
Case Study: Abnormal sound from a small motor
A person listened to the operating noise of a small motor and made a pass/fail judgment. Frequency analysis was performed by normal FFT analysis, but it could not be judged well. On the other hand, when the fluctuating sound analysis focusing on the fluctuating sound was performed, the difference between the good product and the defective product could be clarified.
1...Good product Clear sound (no abnormality)
2...Defective product 1 Abnormal noise with a little unclear sound
3...Defective product 2 Abnormal noise with unclear sound
System Configuration
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