In this paper, the sufficient condition for self-excited oscillation of dynamic systems with gap is given by using qualitative method of differential equations.
本文应用微分方程的定性方法，给出具有间隙动力系统产生自激振动的一个充分条件。
FDTD method has less calculation, precision result, and dynamic distribution of electromagnetic, so it is suitable for calculating photonic crystal band gap.
FDTD方法计算量小，结果较为精确，还可模拟电磁场的动态分布，很适合计算光子晶体光子带隙。
The effects of stator and rotor wall roughness on the dynamic coefficients of the eccentric rotor in large gap annular flow have been investigated with numerical method.
研究结果表明：静子和转子壁面粗糙度对大间隙环流中偏心转子动特性系数有较大影响。
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