MATLAB CONTROL SYSTEM TOOLBOX 9 Especificaciones descargar pdf (Pagina 34)

100

101

2 LTI Models

2-16

In addition to the A, B, C,andD matrices, the display of state-space models

includes state names, input names, and output names. Default names (here,

x1, x2, u1,andy1) are displayed whenever you leave these unspecified. See

“LTI Properties” on page 2-25 for more information on how to specify state,

input, or output names.

Descriptor State-Space Models

Descriptor state-space (DSS) models are a generalization of the standard

state-space models discussed above. They are of the form

The Control System Toolbox supports only descriptor systems with a

nonsingular matrix. While such models have an equivalent explicit form

it is often desirable to work with the descriptor form when the matrix is

poorly conditioned with respect to inversion.

The function

dss is the counterpart of ss for descriptor state-space models.

Specifically,

sys = dss(A,B,C,D,E)

creates a continuous-time DSS model with matrix data A,B,C,D,E.For

example, consider the dynamical model

withvector ofangular velocities. Iftheinertiamatrix is poorly conditioned

with respect to inversion, you can specify this system as a descriptor model by

sys = dss(–F,eye(n),eye(n),0,J) % n = length of vector

------

Ax Bu+=

yCxDu+=

------

1–

()

1–

()

u+=

yCxDu+=

--------

+ T=

ω J

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 590 591

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