Afinite element by coupling plane stress element with Fourier ring element was used in the calculation of the inertial load of the statically indeterminate rotor stay bearing.This settled two flaws in classical material mechanics

which made it difficult to establish correct deformation compatibility condition when the coupling stiffness of support and shaft bearing could not be ignored

and

bigger error in using beam theory was likely caused in the case of absence of shaft character for the rotor.At the same time

because this method transforms the complex three-dimensional question into two-dimensional question

the workload of calculation is smaller

calculating time is shorter

precision and efficiency is higher.