Download - 2-3b 求传递函数
![Page 1: 2-3b 求传递函数](https://reader031.vdocuments.pub/reader031/viewer/2022012304/56815385550346895dc18a4b/html5/thumbnails/1.jpg)
0)(:
0)()(:
2
1
oo
oi
xxfxkB
xxfxxkA
点对点对
ioo xfkxkkxkkf 12121 )(
2121
1
)()(
)(
kkskkf
sfk
sX
sX
i
o
2-3b 求传递函数
k1
k2
f
xi
xo
(b)
A
B
x
2-3a 求传递函数(参考答案)
sffms
sf
sX
sX
i
o
)()(
)(
212
1
2-4a(参考答案) ukxxm
![Page 2: 2-3b 求传递函数](https://reader031.vdocuments.pub/reader031/viewer/2022012304/56815385550346895dc18a4b/html5/thumbnails/2.jpg)
c
cr
cr
uiiR
dtiC
uu
iRuu
)(
1
212
2
11
2-5a 求微分方程
ccrcr
cr
cr
uCuuR
uuR
Cuui
Ruui
])([
)(
/)(
12
2
11
)( 121
2
21
21rrcc uuCR
RR
Ruu
RR
CRR
2121
221
21
21
21
221
1)(
)(
RRCsRR
RCsRR
RR
CsRRRR
RCsRR
sU
sU
r
c
ur uc
R1
R2 C
i1
i2
i
![Page 3: 2-3b 求传递函数](https://reader031.vdocuments.pub/reader031/viewer/2022012304/56815385550346895dc18a4b/html5/thumbnails/3.jpg)
若某系统的单位阶跃响应为 c(t)=1-e-2t+e-t, 试求 ,
传递函数和脉冲响应。
1
1
2
11)(,/1)(
ssssCssR
)2)(1(
24
)(
)()(
2
ss
ss
sR
sCsG
tt eetss
LsGLtg 211 2)(]2
2
1
11[)]([)(
tt eetdt
tdhtg 22)(
)()(
2-82-8
解:
![Page 4: 2-3b 求传递函数](https://reader031.vdocuments.pub/reader031/viewer/2022012304/56815385550346895dc18a4b/html5/thumbnails/4.jpg)
2-9a
)()(
)(1)(
)1()(
1
)1
()(
1
32
32
32
32
sIRsU
sICSRR
RCSRsI
RCS
R
RCS
RsU
r
c
↑i
+
+
ur
uc
R3
R1
C
(a)
-
R2
1)(
1
)(
)(
32
2
1
3
CSRR
CSR
R
R
sU
sU
r
c
试用复阻抗法求传递函数。
2-10c
31132133133222
311321
1)(
)(
GHGGGGHGHHGGHG
GHGGGG
sR
sC
![Page 5: 2-3b 求传递函数](https://reader031.vdocuments.pub/reader031/viewer/2022012304/56815385550346895dc18a4b/html5/thumbnails/5.jpg)
2-11a
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2-11c
2112
231
)(1
)()(
)(
)(
GHGH
GGGsW
sR
sC
2 1
2
)(1 sG
)(2 sH
R C
-
(c)
)(2 sG
)(1 sH
)(3 sG
-
![Page 7: 2-3b 求传递函数](https://reader031.vdocuments.pub/reader031/viewer/2022012304/56815385550346895dc18a4b/html5/thumbnails/7.jpg)
2-12a
![Page 8: 2-3b 求传递函数](https://reader031.vdocuments.pub/reader031/viewer/2022012304/56815385550346895dc18a4b/html5/thumbnails/8.jpg)
2131213212311
214323
1
1
)(
)(
HHGGHHGGGHGHG
HHGGHG
sR
sE
![Page 9: 2-3b 求传递函数](https://reader031.vdocuments.pub/reader031/viewer/2022012304/56815385550346895dc18a4b/html5/thumbnails/9.jpg)
2-12b
1242321211 ,,, GGpGpGGpGp
2151242321211 ,,, GGLGGLGLGGLGL ,
解法 1
14321
2121
2112
21122211
122211
54321
44332211
31
1
)(1)(
)(
GGGG
GGGG
GGGGGGGG
GGGGGG
LLLLL
PPPP
sR
sC
![Page 10: 2-3b 求传递函数](https://reader031.vdocuments.pub/reader031/viewer/2022012304/56815385550346895dc18a4b/html5/thumbnails/10.jpg)
解法 2
)()]()([)(
)()]()([)(
211
121
sGsYsEsY
sGsEsYsY
)()(1
]1)()[(
)(
)(
)()(1
]1)()[(
)(
)(
21
122
21
211
sGsG
sGsG
sE
sY
sGsG
sGsG
sE
sY
![Page 11: 2-3b 求传递函数](https://reader031.vdocuments.pub/reader031/viewer/2022012304/56815385550346895dc18a4b/html5/thumbnails/11.jpg)
解法 3
-
-
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2-13a
![Page 13: 2-3b 求传递函数](https://reader031.vdocuments.pub/reader031/viewer/2022012304/56815385550346895dc18a4b/html5/thumbnails/13.jpg)
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2-14a 、b2-14a(参考答案)
2-14b(参考答案)
213134333212311
43321
1)(
)(
HHGGHGGHGGGHGHG
GGGGG
sR
sC
143354232
654321
1)(
)(
HGGHGGHGG
GGGGGG
sR
sC
![Page 15: 2-3b 求传递函数](https://reader031.vdocuments.pub/reader031/viewer/2022012304/56815385550346895dc18a4b/html5/thumbnails/15.jpg)
2-14c
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2-14d
Δ=1-af-bg-ch-ehgf+afch
P1=abcd, Δ1=1;
P2=ed, Δ2=1-bg;
cfegadehbcdehegcf
egabcadebcde
sR
sC
1
)1)((
)(
)(