A Whole Transfer Matrix Method for the Counter-Rotating Dual-Rotor System

摘要

As counter-rotating dual-rotor is a more and more important technology in aero engine design, a method called whole transfer matrix method is studied to calculate the dynamic behavior of it. The whole transfer matrix method uses coupling matrix in the coupling node to coordinate the functioa In the transmission process, the dual-rotor, binding as a whole element by the coupling bearing, transfers synchronously as a straight line. The initial matrix, the comprehensive matrix and the coupling matrix are discussed and the means to compute critical speed and mode shape are studied. In order to verify the accuracy of the compiled program, a numerical example, whose theoretical solution is known, is analyzed. The experimental system with counterrotating dual-rotor designed by our institute is introduced. The whole transfer matrix method is used to calculate the critical speed and mode shape of the rotor system. The calculation results are compared to the experimental data, which shows that the relative error of first order critical speed between the results calculated by the whole transfer matrix method and the experimental data is small.