The nonlinear damping and stiffnessof a ship motion result in the coupling between rolling and pitch in big amplitude.
舰船运动的阻尼和刚度非线性，导致舰船大幅运动时横摇和纵摇之间的耦合。
2
Then, the couplingof tribology, stiffness and strength of crankshaft-bearing system for internal combustion engine is studied.
在此基础上，进行了内燃机曲轴—轴承系统摩擦学、刚度和强度的耦合研究。
3
Moreover, the article elucidates the influence of various parameters on the dynamic response of the hoist - the damp of elastic coupling, stiffness, each turning inertia of hoist shaft, etc.