Effect of laminate parameters on nonlinear dynamic characteristic of the composite rotor-bearing system with pedestal looseness

The nonlinear dynamics of the composite shaft rotor-bearing system are greatly affected by orientation angle layer and its proportion ply, i.e., ratio in laminate. This paper presents a dynamic analysis with pedestal looseness that considers oil film force looseness. Nonlinear phenomena including periodic, quasi-periodic, chaotic motions analyzed. results indicate stiffness damping coefficients tube can be influenced strongly laminate parameters, which turn affect instability speed rotor system. To enhance system, it is essential to maximize small or ±45° layer. Additionally, increasing layers leads higher rotational for loosening instability. research obtained this have important theoretical value design systems.