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6-8 单位负反馈最小相位系统校正前、后的开环对数幅频特性如图 6-61 所示 。 1. 求串联校正装置的传递函数 G c (s) ;

6-8 单位负反馈最小相位系统校正前、后的开环对数幅频特性如图 6-61 所示 。 1. 求串联校正装置的传递函数 G c (s) ; 2. 求串联校正后,使闭环系统稳定的开环增益 K 的值 。. 解: 校正前的传递函数 G 0 为. 校正后的传递函数 G 为. 求校正后, 使闭环系统稳定的开环增益 K 的值 时 , 将校正后的传递函数改写为. 列出劳斯表. 要使系统稳定,劳斯表的第一列全为正,解之得. 6-9 ( 解答见第六章课件第 6 页幻灯片 。).

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6-8 单位负反馈最小相位系统校正前、后的开环对数幅频特性如图 6-61 所示 。 1. 求串联校正装置的传递函数 G c (s) ;

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  1. 6-8 单位负反馈最小相位系统校正前、后的开环对数幅频特性如图6-61所示。 1. 求串联校正装置的传递函数Gc(s); 2. 求串联校正后,使闭环系统稳定的开环增益K的值。 解:校正前的传递函数G0为 校正后的传递函数G为

  2. 求校正后,使闭环系统稳定的开环增益K的值时,将校正后的传递函数改写为求校正后,使闭环系统稳定的开环增益K的值时,将校正后的传递函数改写为

  3. 列出劳斯表 要使系统稳定,劳斯表的第一列全为正,解之得

  4. 6-9 (解答见第六章课件第6页幻灯片。)

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