DYNAMIC COEFFICIENTS OF AXIAL SPLINE COUPLINGS IN HIGH-SPEED ROTATINGMACHINERY

This paper provided the first opportunity to quantify the angular stif fness and equivalent viscous damping coefficients of an axial spline c oupling used in high-speed turbomachinery. The bending moments and ang ular deflections transmitted across an axial spline coupling were meas ured while a nonrotating shaft was excited by an external shaker. A ro tordynamics computer program was used to simulate the test conditions and to correlate the angular stiffness and damping coefficients. The e ffects of external force and frequency were also investigated. The ang ular stiffness and damping coefficients were used to perform a linear steady-state rotordynamics stability analysis, and the unstable natura l frequency was calculated and compared to the experimental measuremen ts.