机械工程测试技术基础课后习题答案(9)

机械工程测试技术基础课后习题答案

2 120 2000 10 6

Uy=4 120

*3=3 10 3(V)

双臂，UR

y=

2RU0 0

USg×R× y=

2R

U0

2 120 2000 10 6

Uy=2 120

*3=6 10 3(V)

双臂的灵敏度比单臂的提高一倍。

4.4解：UR

y=

RU0 0 USg×R× y=

R

U0

Uy=Sg×(Acos10t+Bcos100t)×Esin10000t

=Sg×AEcos10tsin10000t+Sg×BEcos100tsin10000t

=

12St+sin9990t)+1

gAE(sin100102

SgBE(sin10100t+sin9900t)U)=14jS100101001099909990

y(fgAE[ (f+2 ) (f 2 + (f+2 + (f 2 )]

+14jS101001010099009900gBE[ (f+2 (f 2 )+ (f+2 )+ (f 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)+(f4.10 解：H(s)=

1 s+1=1RCs+1=1

10 3s+1

8500)]