《结构图的基本形式.ppt

习题2-15(p72图2-63) 习题2-15方块图 * 结构图三种基本形式 G1 G2 G2 G1 G1 G2 G1 G2 G1 G2 G1 G1 G2 1+ 串 联 并 联 反 馈 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 结构图等效变换方法 1 三种典型结构可直接用公式 2 相邻综合点可互换位置 3 相邻引出点可互换位置 注意事项： 1 不是典型结构不可直接用公式 2 引出点综合点相邻，不可互换位置 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 引出点移动 G1 G2 G3 G4 H3 H2 H1 a b G4 1 G1 G2 G3 G4 H3 H2 H1 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. G2 H1 G1 G3 综合点移动 向同类移动 G1 G2 G3 H1 G1 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. G1 G4 H3 G2 G3 H1 作用分解 H1 H3 G1 G4 G2 G3 H3 H1 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Pk—从R(s)到C(s)的第k条前向通路传递函数 梅逊公式介绍 R-C C(s) R(s) = ∑Pk△k △ : △称为系统特征式 △=1- ∑La+ ∑LbLc-∑LdLeLf+… 其中: — 所有单独回路增益之和 ∑La ∑LbLc—所有两两互不接触回路增益乘积之和 ∑LdLeLf—所有三个互不接触回路增益乘积之和 △k称为第k条前向通路的余子式 求法: 去掉第k条前向通路后所求的△ Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 梅逊公式例R-C R(s) C(s) L1= –G1 H1 L2= – G3 H3 L3= – G1G2G3H3H1 L4= – G4G3 L5 = – G1G2G3 L1L2= (–G1H1) (–G3H3) = G1G3H1H3 L1L4=(–G1H1)(–G4G3)=G1G3G4H1 P1=G1G2G3 △1=1 G4(s) H1(s) H3(s) G1(s) G2(s) G3(s) G1(s) G2(s) G3(s) G1(s) G2(s) G3(s) G1(s) G2(s) G3(s) G4(s) G3(s) P2= G4G3 △2=1+G1H1 G4(s) G3(s) C(s) R(s) =? Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. L1L2= (G1H1)(-G 2 H2 ) L1= G1H1 L2= –G2H2 L3= –G1G2H3 G1(s) G3(s) H1(s) G2(s) H3(s) H2(s) R(s) C(s) N(s) E(S) C(s)= 1- G1H1+ G2H2+ G1G2H3-G1H1G2 H2 G3G2 +G1G2 + G2 R(s)[ ] N(s) 梅逊公式求C(s) (1-G1H1) Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright