Based on the complex modal theory, some problems arising in machine tool modal analysis by impulse excitation are examined.
本文从复模态理论出发，探讨了在机床模态分析中，应用脉冲激振法激励机床时的一些问题。
According to the vector modal theory for any shape profile metallic grating, the diffraction fields are studied numerically.
本文根据任意槽形金属光栅的矢量模式理论，对正弦槽光栅和半椭圆槽光栅的情况进行了推导和数值计算。
Rigorous modal theory is used for analyzing their diffractive properties in sequence, and finally total diffractive efficiency of grating lenses can be easily obtained.
根据光栅透镜的线宽和间距微小渐变的特点，建立了光栅透镜的物理模型，并利用严格模式理论对其衍射特性进行分析。
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