2 120 2000 10 6
Uy *3 3 10 3(V)
4 120
双臂，Uy
R
U0 2R0
Sg R 2R
U0
Uy
2 120 2000 10 6
Uy *3 6 10 3(V)
2 120
双臂的灵敏度比单臂的提高一倍。
4.4解：Uy
R
U0 R0
Sg R R
U0
Uy
Uy Sg (Acos10t Bcos100t) Esin10000t
Sg AEcos10tsin10000t Sg BEcos100tsin10000t
11
SgAE(sin10010t sin9990t) SgBE(sin10100t sin9900t)22
1100101001099909990
Uy(f) jSgAE[ (f ) (f ) (f ) (f )]
42 2 2 2 1101001010099009900 jSgBE[ (f ) (f ) (f ) (f )]42 2 2 2
4.5解：xa (100 30cos t 20cos3 t)(cos ct)
100cos2000 t 30cos1000 tcos2000 t 20cos3000 tcos2000 t
100cos2000 t 15(cos3000 t cos1000 t) 10(cos5000 t cos1000 t)
Xa(f) 50[ (f 10000) (f 10000)] 7.5[ (f 10500) (f 10500)]
7.5[ (f 9500) (f 9500)] 5[ (f 11500) (f 11500)] 5[ (f 8500) (f 8500)]4.10 解：H(s)
111
3 s 1RCs 110s 1
