BISOPE series 53 Comparison of Vibration Analysis Vibration and Acousti...

BISOPE series 53- Comparison of Vibration Analysis (Vibration) and Acoustic Emission (AE)

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Vibration and noise can be easily distinguished by comparing the media of solid and air, but since vibration and ultrasonic sound emission are not differences in media, the concept of frequency must be known.

The practical use frequency of vibration is about 1~10,000Hz, and noise is 16~8,000Hz, while the area of ultrasonic sound emission is 2kHz~100kHz. Of course, anything beyond that is in the radio wave (MHz) range.

The use of ultrasonic waves in equipment diagnosis probably began with the assumption that sounds or acoustic vibrations that humans cannot hear may contain information (signals) about the state of the machine. Therefore, ultrasonic waves are an area that includes both airborne and structural sounds. Among them, acoustic emission refers to ultrasonic waves generated due to friction between solids and solids or between solids and fluids. Bearing friction or fluid leakage in pipes are exact examples.

 

​Applying ultrasound to equipment diagnosis, sound emission

In general, ultrasonic waves are waves (longitudinal waves) that exceed the audible frequency (20 Hz to 20 kHz) and have the advantage of having strong straight-line properties, penetrative properties, and the ability to accumulate energy. The uses are endless, starting with car rear sensors, but the most common uses are medicine and military. There are many examples of it being used in our industry, and it is widely used as a water level sensor or non-destructive testing. Ultrasonic waves used for machine diagnosis identify def...........

https://blog.naver.com/vs72

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