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自 动 控 制 原 理第 五 章 频 域 分 析 法 - 频 率 法对 数 相 频 特 性 : 2ξωωnϕω( ) = − arctan2⎛ ω ⎞1 − ⎜ ⎟⎝ωn⎠1特 征 点 : nLω = ω , ( ω) = 20lg , ϕ 90= − o2ξ幅 相 曲 线

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