Torsional Vibration Calculator

Calculate torsional natural frequency and critical speed for shaft systems with multiple disks.

Mass moment of inertia of first disk.
kg·m²
Mass moment of inertia of second disk.
kg·m²
Torsional stiffness of the connecting shaft. kt = G*J/L.
N·m/rad
Steel: 80 GPa.
GPa
Shaft diameter for stiffness calculation.
mm
Length between disks.
mm

Results

Torsional Natural Freq ωn-rad/s
Natural Frequency fn-Hz
Critical Speed-rpm
Calculated kt from shaft-N·m/rad
References: Rao — Vibrations; Den Hartog — Mechanical Vibrations