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时间:2021-01-28
《自动控制原理+课后答案.docx》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、.自控原理课后习题精选..2-5试分别列写图2-3中各无源网络的微分方程(设电容C上的电压为uc(t),电容C1上的电压为uc1(t),..以此类推)。..+uc(t)-C+uc1(t)-C1+uR1(t)-R1..R1RRCC..uiR2uoui+uc2(t)C2-uoui+uc1(t)--uc2(t)+uoR2....(a)解:(a)设电容C上电压为(b)图2-3习题2-5无源网络示意图uc(t),由基尔霍夫定律可写出回路方程为(c)....uc(t)ui(t)uo(t)..Cduc(t)dtuc(t)R1uo(t)R2..整理得输入输
2、出关系的微分方程为Cduo(t)(1dtR11)uR2(t)Cdui(t)dtui(t)R1....o(b)设电容C1、C2上电压为uc1(t),uc2(t),由基尔霍夫定律可写出回路方程为....uc1(t)ui(t)ui(t)uc2(t)Ruo(t)uo(t)uc2(t)R2Cduc2(t)dt..整理得输入输出关系的微分方程为uo(t)uc2(t)RC1duc1(t)dt....RCCd2uo(t)(2CC)duo(t)uo(t)iRCCd2u(t)2Cdui(t)ui(t)..12dt212dtR12dt2
3、1dtR....(c)设电阻R2上电压为uR2(t),两电容上电压为uc1(t),uc2(t),由基尔霍夫定律可写出回路方程为....uc1(t)ui(t)uR2(t)(1)....uc2(t)uo(t)uR2(t)(2)....Cduc1(t)dtCduc2(t)dtuR2(t)R2(3)....ui(t)uo(t)R1Cduc2(t)dt(4)..(2)代入(4)并整理得..duR2(t)duo(t)ui(t)uo(t)(5)..dtdtR1C..(1)、(2)代入(3)并整理得Cdui(t)dtCduo(t)dt2Cdu
4、R2(t)dtuR2(t)R2..两端取微分,并将(5)代入,整理得输入输出关系的微分方程为..od2uRC(t)(11)duo(t)uo(t)d2u(t)iRC1dui(t)ui(t)..2dt2R1CdtR1C2dt2R1CdtR1C..2-5求图2-4中各无源网络的传递函数。..+Uc(s)-C+Uc1(s)-C1+Uc1(s)-R1-Uc2(s)+..R1RRC+C..Ui(s)R2Uo(s)Ui(s)+Uc2(s)C2-Uo(s)Ui(s)UR2(s)R2-Uo(s)....(a)图2-4习题2-6示意图解:
5、(a)由图得(b)CsUC(s)UC(s)R1Uo(s)R2(c)(1)....UC(s)Ui(s)Uo(s)(2)....(2)代入(1),整理得传递函数为Uo(s)Ui(s)Cs1R1Cs11R1R2R1R2CsR2R1R2CsR1R2..(b)由图得..UC1(s)Ui(s)Uo(s)Ui(s)UC2(s)Uo(s)UC2(s)C2sUC2(s)(1)(2)..RR....RC1sUC1(s)Uo(s)UC2(s)....整理得传递函数为U(s)RC1s1RCs2R2CCs22RCs1..oU(s)2RC2s1121R2
6、CCs2Rs(2CC)1..iRC1s1212RC2s2..(c)由图得..UC1(s)Ui(s)UR2(s)(1)....UC2(s)Uo(s)UR2(s)(2)....CsUC1(s)CsUC2(s)UR2(s)R2(3)....Ui(s)Uo(s)R1CsUC2(s)(4)..整理得传递函数为Cs1..U(s)RRRC2s2RCs..oU(s)221112RRC2s2(R12R)Cs1..iCsR1R21212R1R2Cs..2-8试简化图2-6中所示系统结构图,并求传递函数C(s)/R(s)和C(s)/N(s)。解:
7、(a)..⑴求传递函数C(s)/R(s),按下列步骤简化结构图:..图2-6习题2-8系统结构图示意图①令N(s)0,利用反馈运算简化如图2-8a所示....R(S)-G11G1H1G21G2H2C(S)..H3图2-8a②串联等效如图2-8b所示..R(S)-G11G1H11G2G2H2C(S)..H3图2-8b③根据反馈运算可得传递函数..C(s)R(s)G11G1H111G11G1H11G2G2H2HG23G2H2(1G1H1)(1G1G2G2H2)G1G2H3....1G1H1G2H2G1G2G1H1G
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