Abstract: Conditional nonlinear optimal perturbations (CNOPs) of a two-dimensional quasigeostrophic model are obtained numerically. The CNOP is the initial perturbation whose nonlinear evolution attains the maximum value of the cost ...

Abstract: The nonlinear friction of rod string is an important foundation of dynamic simulation and efficiency optimization in sucker rod pumping system (SRPS). As we know, there are geometrical nonlinearity and contact nonlinearity ...