以一维驱动非线性漂移波方程为模型,研究了利用外加周期信号成功地将时空混沌态控制到空间有规态时,系统不动点性质的改变及其与相同步之间的关系.研究发现,控制前时空混沌态中嵌入的鞍点,在施加控制信号后表现出不稳定焦点的行为.不动点性质的这种改变是引起非完美相同步向完美相同步的转变和时空混沌得以控制的内在机制.
When applying periodic signal with proper frequency and strength, spatiotemporal chaos is suppressed successfully. It is found that when the control signal is added the original saddle point embedded in the spatiotemporal chaos is changed to an unstable focus. Such property change of the unstable fixed point allows the possibility of the oscillators with different time scales adjusting to a functional perfect phase synchronization, in contrast to the imperfect one before the control.