The results show that the coupled bending-torsional vibration range increases and the motion changes from periodicmotion to quasi-periodicmotion as the mass eccentricity rises;
结果表明：随着质量偏心的增加，弯扭耦合区的范围增大，系统运动由周期运动变为概周期运动；
2
Besides the equilibrium and periodic solution, the almost periodic solution, which sometimes appears as quasi-periodic solution, is also a long term regular motion of nonlinear system.
The results obtained show that several motions may occur in the region of combination resonance, including two kinds of quasi-periodic vibrations and combined periodic motion.