Then it is nessaryto introduce the concept of almost periodic system,which is a special time-varyingsystem.
这就引入了概周期系统这个概念,它是一类特殊的时变系统。
参考来源 - 核为概周期的线性时变系统·2,447,543篇论文数据，部分数据来源于NoteExpress
In section 3, the author discusses some relationships among the separabilities and the almost periodic and asymptotically almost periodic solutions of almost periodic system.
在§3中，研究一般概周期系统，讨论了其概周期解和渐近概周期解与分离性之间的某些关系。
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.
非线性系统的长期规则运动除了平衡点和周期解以外，概周期解，或有时表现为拟周期解也是一种长期规则运动。
The instability of the unbalanced system motion may result in doubling period bifurcation, almost periodic motion and chaotic motion.
存在不平衡量时，系统失稳可能产生拟周期分岔、倍周期分岔并可能导致混沌振动。
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