Table 3: Theoretical and experimental values of mass moment of inertia and torsional natural frequencies.

Mass moment of inertia for platform, kg·m2Mass moment of inertia for platform with propeller, kg·m2Mass moment of inertia for propeller, kg·m2Total mass moment of inertia (propeller + plate* + shaft**), kg·m2 Torsional natural frequency for uncracked shaft 𝑤 𝑛 , Hz

TheoreticalExperimentalExperimentalExperimentalTheoretical and
experimental
TheoreticalExperimental
(a)(b)(c)(d) = (c) − (b)
7.746 × 10−37.571 × 10−31.163 × 10−24.057 × 10−35.639 × 10−343.0443.72

* 𝐽 p l a t e = 1.5232 × 10−3 kg·m2 (by experimental measurements); ** 𝐽 s h a f t = 1.5232 × 10−3 kg·m2 (by theory).