MATLAB CONTROL SYSTEM TOOLBOX 9 Guía de usuario descargar pdf (Pagina 329)

100

101

Hard-Disk Read/Write Head Controller

9-21

Using the values kg , Nm/(rad/sec), Nm/rad,

and Nm/rad, form the transfer function description of this system.

At the MATLAB prompt, type

J = .01; C = 0.004; K = 10; Ki = .05;

num = Ki;

den = [J C K];

H = tf(num,den)

MATLAB responds with

Transfer function:

0.05

-----------------------

0.01 s^2 + 0.004 s + 10

The taskhere is todesign adigitalcontroller thatprovidesaccurate positioning

of the read/write head. The design is performed in the digital domain. First,

discretize the continuous plant. Because o ur plant will be equipped with a

digital-to-analog converter (with a zero-order hold) connected to its input, use

c2d with the 'zoh' discretization method. Type

Ts = 0.005; % sampling period = 0.005 second

Hd = c2d(H,Ts,'zoh')

Transfer function:

6.233e–05 z + 6.229e–05

-----------------------

z^2 – 1.973 z + 0.998

Sampling time: 0.005

J 0.01

C 0.004

K 10

0.05

1 2 ... 324 325 326 327 328 329 330 331 332 333 334 ... 648 649

Comentarios a estos manuales

Sin comentarios

MATLAB CONTROL SYSTEM TOOLBOX 9 Guía de usuario Pagina 329

Comentarios a estos manuales

Relacionado con productos y manuales para No MATLAB CONTROL SYSTEM TOOLBOX 9