Estratto del documento

DIRECT DISTURBANCE COMPENSATION

.

13

fedback loops controd also

could

closed depend

For action

the d

on

, No

disturbances directly

acting lit

the be

they measured)

process

on can . o

depend

variable to

manipulated

the

want

We smart

in on

way

a &

dp goal possible

close /DISTURBANCE

to

to Y/Dp

make

is

cre as

: Zero

as lineare

fore

compute

RETECTION) Let's system &

a : dp

· ↳

~

Cals)

H5) H(S)

loop

Y140 doesn't

the change

T(S)

=

= L(s)

1 + 2 o'hy

144)

>

1 )

+

= ...

[d()h(s)

H()

(15)

Y/Dp +

=

L(s) L(S) L(5)

1

1 1 1 )

+ +

+ ...

H(s)/G(s)

if TIDEALCASE)

H(s) (d(s)((s) (d(s)

+ 0

0 < -

= =

=

the distunbance basically

for compensation two problems

solution has

ideal :

frequency

law approximation

usually would

Cd(s) not need

#1 is we a

proper a

it phase far bad delay)

(either poietime

Gls) non-minimum

is

#2 zemos on future

computing dependency

pole

unstable inputs

the AND/aR

matio [d(S)

gives on

an

level dp

of

that

Remember always ununtainty

there approximated

t .

in Ch(s) is

is s

a .

. by

bandwidth

within multiplied

of

Anyway the compensation

imperfect

controllere

the is

any

number

small /

S(s) Y/Dp [d(s)h(s))

1 (H(s) S(S)

((s)

a = 1 + +

: ·

= .

HOW APROXIMATE Cd(s)

DO WE I d

= Be

e

let's G1s)

consider = st

(MP) HI)

# we

, - lcd ** /

5

0 . ·

I > w

H(s)/4(s)

(d(s) 2

have [11 INCTPROPER)

2s)

+ : -odB

-

= =

- I

- o ⑤

CFIS)

lar-frequency E COMPENSATOR

STATIC

· .

approx = +

- for

significant disturbances

if --w

I good

not there high w)

are ** 1800

+25

approximation

second -E -

extend

(S) (we

C -

· can

= . 0 5S

It . of

fast dp

by

the for

pd) Overshoots

approximation at changes

higher changing the

w .

.

1011-s)

let's instead consider the transfer

GIS) get

Sit

H(S)

(NMP)

# 2 5/ We

= .

=

s(1 ,

25)

+

function -112 Instable) that

(d(s) approximate as

can

we :

= ,

law-frequency *

approximation [ -E

(S) STATIC COMPENSATOR

· = < 1 ad

pant -E

to CdmpCdm

compensate

try the (d(s)

NMP

· =

.

= ·

1 actually

it (doesn't

** untain e

1.

approximate past a

work

(s)

C

as -

=

APPROXIMATION ACTUALLY USEFUL

IS

WHEN THE with disturbance rejection

on

Harbandwidth Ya

of

limitations

have strong the

When we

controd) behaviore

[due -

phase 1 -

to non-minimum in

process sensons]

of

moderation the

controd lots of T

Gls) nase

issues on ct

I

,

, then

actually the

measured

dp be compensation

AND can can expl Ts)

H(s) /Its)

(2

= -

be useful Graphical

land it immediatly) example

acts : 10/17)

. 4(s) =

if bad

the ned

then

wed DISTURBANCE (dis)

REJECTION is we

>

additional for distunbance to

want Morraver

take .

into

need

os sensor

we every

one we account ,

distunbance to

quite modelling

sensitive

compensation not mobust)

(ununtainty .

is crimous ,

FREEDOM CONTROLLERS

TWO-DEGREES -

OF

14 . d

If lots of

disturbance

not

consider much

we , con

yoc((s) <41)

set

fast point tracking

and want

(sensors)

noise large to the

follow

need ander

in

very

a w

we e

In

point properly this consider

set case a

can

. we ⑪

PONT

SET COMPENSATION : (p(s)

> d

ACTION DEPEND

DOESN'T

CONTROL

THE ONLY ON THE >

541))380

((s)

BUT y00

FEEDBACK SET

ALSO POINT

CONTROL THE

ON > 0 Y

n

there

the by

decided

Since setpoint

(DIRECTLY) is us ,

. for

measurament [p(s)

is nase

no We HAVE NOSE

MUCH

EVEN IF WE

WANT

WE

functions

following

consider the

Let's transfer :

= (((41) 225(44)

() +

↑ 143)

/ 1 A(p(s)

=

= =

C(s)G(s)

1 C(s)G(s)

+ 1 +

be problematic

but phase (instability)

solution be

this could non-minimum

Gls)

as

very

can on

law-frequency

to apply approximation

not of

the idea kind

Basically is same

proper :

.

C = function

the

filtim

lar-pas becomes

st

with chosen

F(s) FIS) propera

.

ROCE

PLAY

NaSE DOESN'T WANT

CAN

ALL

ANY AS

AS WE

POINT TRACKING

AT SET FAST

GET

WE

: ((S)

DESIGN

REGARDLESS (S) DISTURBANCE

FEEDBACK

WE FOR

CONTROLLER

OF COMPENSATION

CAN THE

+ .

not

of

lots

with distinbances

Opposite (JET and

much

FILTERING)

PANT

Sunario noise no

,

have

fast

Anteprima
Vedrai una selezione di 4 pagine su 11
Sistemi di controllo-03 (ENG) Pag. 1 Sistemi di controllo-03 (ENG) Pag. 2
Anteprima di 4 pagg. su 11.
Scarica il documento per vederlo tutto.
Sistemi di controllo-03 (ENG) Pag. 6
Anteprima di 4 pagg. su 11.
Scarica il documento per vederlo tutto.
Sistemi di controllo-03 (ENG) Pag. 11
1 su 11
D/illustrazione/soddisfatti o rimborsati
Acquista con carta o PayPal
Scarica i documenti tutte le volte che vuoi
Dettagli
SSD
Ingegneria industriale e dell'informazione ING-INF/04 Automatica

I contenuti di questa pagina costituiscono rielaborazioni personali del Publisher AlessandroGu di informazioni apprese con la frequenza delle lezioni di Control systems e studio autonomo di eventuali libri di riferimento in preparazione dell'esame finale o della tesi. Non devono intendersi come materiale ufficiale dell'università Politecnico di Milano o del prof Casella Francesco.
Appunti correlati Invia appunti e guadagna

Domande e risposte

Hai bisogno di aiuto?
Chiedi alla community