Then approximate analytic formula of system frequency are obtained. Meanwhile, approximate analytic formulation of limit velocity is obtained.
而后求出了系统固有频率的近似解析公式，同时也得到了极限流速的近似解析公式。
In this paper, a formula of approximate analytic solution of subharmonic resonant overvoltage is established according to the theory of region analysis.
本文以区域分析理论为工具，提出分次谐波共振过电压的一个近似解析公式。
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