周期性的边界条件(wrap-around boundary conditions) 可以用来表示无限周期性的结构,比如:频率选择表面(frequency selective surface)、相控阵天线(phased array antenna)。
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上面的方法不能用于负载特性分析,原因在于不能确定周期性的边界条件。
However, this approach cannot be used for analysis of load characteristics because it proves impossible to specify periodic boundary conditions.
慢波系统一般采用周期性结构,其中传输的电磁波需要满足十分复杂的边界条件。
Slow-wave systems generally employ periodic structures, and the electromagnetic waves transmitted therein are required to satisfy very complicated boundary conditions.
我们用离散元(DEM)方法研究了这种运输机在水平配置时的流动机制,施加周期性边界条件并忽略流动介质的存在。
We investigate the flow mechanism of this conveyor in a horizontal configuration by a discrete element method (DEM), applying a periodic boundary and omitting the existence of fluid medium.
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