磁盘驱动读取系统的分析设计

1、百度文库磁盘驱动读取系统的分析设计一、闭环系统的性能分析(1)确定使闭环系统稳定的Ka的取值范围>>G1=tf(5000,1,1000);>>G2=tf(1,conv(1,0,1,20);> >G=series(G1,G2)Transferfunction:5000sA3+1020sA2+20000s开环传函闭环传函50000Kg3=-2s31020s220000s50000KG3=-2s31020s220000s50000K> >symsKden> >den=11020200005000*K;> >K=den(2)*de

2、n(3)/den巧000K=4080Ka值，仿真闭环系统的阶跃响应，并进行分有劳斯判据可得k的范围是0<K<4080(2)在上述取值范围内取较小和较大的两个析10K=100时> >g=100*Gg1=feedback(g,1)C=dcgain(g1)Transferfunction:500000sA3+1020sA2+20000sTransferfunction:500000sA3+1020sA2+20000s+5000001c,t=step(g1);>>y,k=max(c);>>percentovershoot=100*(y-C)/Cperce

3、ntovershoot=>>t=setllingtime(g1)t=K=1000时>>g=1000*GTransferfunction:5e006sA3+1020sA2+20000s>>g2=feedback(g,1)Transferfunction:5e006sA3+1020sA2+20000s+5e006>>c,t=step(g2);>>C=dcgain(g2)C=>>y,止maxy=调节时间函数11>>percentovershoot=100*(y-C)/Cpercentovershoot=t=setll

4、ingtime(g2)t=c(tn)c()超调量100%21.6918%c()调节时间ts00.10,20.3040.50.60.70.S"09Timeoffset0K=1000时超调量%c(tp)c()100%71.0891%c()调节时间ts(s)(3)考察扰动信号为单位阶跃时，上述两个Ka取值情况下，系统的抗干扰能力，并进行分析>>g2=tf(1,conv(10,120)Transferfunction:1sA2+20s>>g1=tf(5000,11000)Transferfunction:5000s+1000>>symsk>>g

5、3=feedback(g2,g1,1)Transferfunction:s+1000sA3+1020sA2+20000s-5000>>g3=feedback(g2,-g1,1)Transferfunction:s+1000sA3+1020sA2+20000s+5000>>g4=-g3Transferfunction:-s-1000sA3+1020sA2+20000s+5000Dss1000-32/Yss1020s20000s5000Ka当K=100时/>>g=tf(-1-1000,1102020000500000)Transferfunction:-s-10

6、00sA3+1020sA2+20000s+500000>>c,t=step(g);>>y,k=min(c)y=k=15扰动输入的传递函数c(t)=*10-3(s)当K=1000时>>g=tf(-1-1000,11020200005000000)Transferfunction:-s-1000sA3+1020sA2+20000s+5e006>>c,t=step(g);>>y,k=min(c)y=k=11c(t)=*10-3(s)Q0.10.2Q30.40.50.80i7DJ0.91Timeoffset0(4)针对如下的性能指标要求，折中

7、选取一个合适的Ka值性能揖标调节时间预期值小于5%小于230ms对单位阶跃干扰的最大响应值小于5又1。7取Ka=100、速度反馈系统的性能分析大一RQ)-三二J3闻-平J建(1)运用第3章中所学的劳斯判据，确定要使闭环系统稳定,Ka和K1应如何选取?YK1=针对你选取的Ka和K1,仿真闭环系统的阶跃响应，并计算超调量、调节时间和Ka=100,(2)对单位阶跃扰动的最大响应值。>>g1=tf(5000,11000)Transferfunction:5000s+1000>>g2巾1,120)Transferfunction:s+20百度文库3812Transferfunct

8、ion:1s+20Transferfunction:500000>>>>C=1y=k=0.2卜02030.8Imeolfset;0c,t=step(g0);C=dcgain(g0)>>g3=tf(1,120)>>y,止max(c)0L0>>t=setllingtime(g0)t=>>g0=feedback(g3*feedback(100*g1*g2,-1),1)sA3+1020sA2+35000s+5000001I-百度文库17超调量9调节时间ts%C(tp)C()100%2.0650%c()/，/>>perc

9、entovershoot=100*(y-C)/Cpercentovershoot=>>g10=-feedback(g2*g3,-g1*100*1/g3+1),1)Transferfunction:-s-1000sA3+1020sA2+35000s+500000>>step(g10)>>c,t=step(g10);>>y,k=max(c)y=0k=1>>y,k=min(c)y=k=38对单位阶跃扰动的最大响应值：c(t)=*10-3扰动输入传递函数/(s)。三、PD控制器的性能分析一一根轨迹法干扰K3值>>G3=series(G,tf(11,1)Transferfunction:5000s+5000sA3+1020sA2+20000s>>rlocus(G3)ftXYteunm