Before revision: Dunkerley’s formula (approximation) The whirling frequency of a symmetric cross section of a given length between two points is given by: RPM where E = young 's modulus I = Second moment of area, m = mass of the shaft, L = length of the shaft between points
After revision: Dunkerley’s formula (approximation) The whirling frequency of a symmetric cross section of a given length between two points is given by: RPM where: E = Young 's modulus I = second,. moment of area, m = mass of the shaft, L = length of the shaft between points