On the Relationship between Acoustics and Waviness

On the Relationship between Acoustics and Waviness

#On the Relationship between Acoustics and Waviness

Waviness is a shape metric term between roughness and contour. If roughness is a microscopic roughness and contour is a macroscopic shape metric term, then waviness is a mesoscopic geometric quantity.

Roughness typically refers to shape features with wavelengths below 1mm, waviness refers to shape features with wavelengths between 1mm and 10mm, and contour refers to shape features with wavelengths above 10mm.

NVH refers to Noise, Vibration, and Harshness. The roughness and waviness of the surface of the parts are key factors affecting equipment vibration and noise (greater than the influence of lubrication).

The sound emitted by the device is closely related to the geometric features of the surface.

Usually, the frequency of acoustic emission shock pulse vibration is related to the equivalent size of the sound source.

The noise frequency caused by roughness is higher, so only acoustic emission and SPM methods can be used to measure it. The vibration and noise frequencies caused by waviness are lower, and only vibration sensors are needed to pick them up.