Vibrations low-frequency

Unlike high-frequency vibrations, low-frequency vibrations cannot be modeled as accurately as harmonic oscillations. " ... 

Vibration and noise — Tools, equipment, and machinery that vibrate at a low frequency can injure a part of the body or the whole body. However, the most common sound-induced injury is due to high frequency vibration. Low frequency vibration hazards exist in two primary categories ... 

---