控制工程基础5-第2章(控制系统的框图及其化简练习题)ppt课件.ppt

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1、1首先将间的引出点后移到方框的输出端H2(s)H2(s)例化简系统的结构图，求传递函数。Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.2接着将组成的内反馈网络简化，其等效传递函数为H2(s)/G4(s)H2(s)Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copy

2、right2004-2011AsposePtyLtd.3得到图为H2(s)/G4(s)H2(s)Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.4得到图为然后将组成的内反馈网络简化，其等效传递函数为：H2(s)/G4(s)Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.

3、Copyright2004-2011AsposePtyLtd.最后将求得其传递函数为：其中：Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.G1G2G3G4H3H2H1R(s)+-+--+C(s)例化简系统的结构图，求传递函数。Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0

4、.0.Copyright2004-2011AsposePtyLtd.G1G2G3G4H1H2H3-R(s)C(s)--G2Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.G1G2G4H1H3-C(s)-R(s)Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyri

5、ght2004-2011AsposePtyLtd.G1G2H1-C(s)R(s)Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.H1-C(s)R(s)第四节框图及其化简Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePty

6、Ltd.C(s)R(s)等效变换后系统的结构图：Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.12练习：试化简下述系统结构图，并求传递函数C(s)/R(s)显然化简该结构图也需要移动比较点和引出点，需要注意得是，引出点和比较点之间是不宜随便移动的。因此我们将比较点前移，将引出点后移。得到图为Evaluationonly.CreatedwithAspose.S

7、lidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.13将两个比较点合并，并将求出的等效传递函数：得到图为得到系统等效传递函数：Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.以机电随动系统为例，如下图所示举例说明系统动态结构图的构成Evaluationonly.Createdw

8、ithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.其象方程组如下：Evaluationonly.CreatedwithAspose.Slidesfor.NET3.5ClientProfile5.2.0.0.Copyright2004-2011AsposePtyLtd.系统各元部件的