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7/29/2019 04060268 http://slidepdf.com/reader/full/04060268 1/6 Proceedings of the 25th Chinese Control Conference 7-11 August, 2006, Harbin, Heilongjiang Fuzzy Control for Active Suspension in ADAMS/Car Full Vehicle Azadeh Farazandeh, Reza Kazemi Dept. of Mechanical Eng, Khajeh Nasir Aldin e Toosi University of Technology E-mail: , ka mc Abstract: In this research, fuzzy technique was considered to control an active suspension. The main targets in this study are elimination of the body bounce and pitch in normal ride and roll attitude as well as its bounce resulting from road bumps, on individual tires by using suspension system in both side of car and both axles. In order to have the ability to interpret the results of full model of vehicle in ADAMS, the method of crawl and walk and the classic models withlower degrees of freedom was used .The controller structure was designed in MATLAB/Simulink. The full process was implemented using link between ADAMS as a Multi-Body Dynamics Simulator & MATLAB as a control simulation environment. Finally ride comfort of vehicle equipped with fuzzy controller shows a considerable increase with respect to ISO 2631 criteria. Key Words: Fuzzy Control, Vehicle Dynamics, Ride Comfort, Bounce, Pitch, Roll Movements 1 INTRODUCTION The main functions of vehicle suspension system are to minimize the vertical acceleration transmitted to the passengers to provide ride Comfort and to maintain the tire-roadcontact to provide holding characteristic, and to keep the suspension travel (rattle space) small. Active suspensions can improve the comfort considerably by the ability to control the vibrations of the unsprung mass and handling of vehicle. Therefore, only a compromise between conflicting criteria of ride and handling can be obtained, if the suspension is built from passive components, such as fixed ratio springs and dampers. So the answer to this problem seems to be found in the development of an active suspension system [1, 2]. Most Control strategies of active suspension system have been based on optimal or adaptive control algorithms such as model reference adaptive control, explicit self-tuning adaptive control and non-linear self tuning control. The use of Fuzzy logic control for the design of active suspension systems has been the subject of more research in recent years [3].The derivation of linear active controls in a closed form for the system necessitates the assumption that car models are described by a linear system or an approximate linear system, and the performance index is given as the quadratic form of the state variables and the active control. However, if car models are denoted as a complicated one with the nonlinearity and uncertainty, active suspensions with intelligent and nonlinear structure on the basis of fuzzy reasoning neural network, and sliding mode control are proposed for such complicated models. Then, the active suspensions give more satisfactory performance, but need more complicated structure in the control algorithms, than linear active suspensions. [4] 2 EVALUATION OF RIDE COMFORT After the power spectral density function for acceleration of the vehicle has been obtained, further analysis is required to relate it to any ride comfort criterion such as standard of ISO 2631, shown in Fig (1). 00- 4 i - I'0 5 I "- - 0 _ X ae;- 'Sg' ./ I/i V ~ ~ / Sd a s D 0 1s 20 0 50ZI Az Cente Firequny Of Thfid Oc U Bad Fig (1) : ISO 263 idiagram for vertical acceleration Then the transformation of the power spectral density function into root-mean-square values of acceleration as a function of frequency is necessary. A series of discrete center frequencies within the range of interest is first selected. To determine the mean-square value of acceleration at a given center frequency f, , the power spectral density function is integrated over a one-third octave band of which the upper cutoff frequency is a2' times the lower. In other words, by integrating the power spectral density function over a frequency band of 0.89- 1.12 f,, the mean-square value of acceleration at a given center frequency fC can be obtained. The root-mean- square (rms) value of acceleration at each center frequency ca n be calculated by: rms accelerati on r JS (f )df (1) 0.89 fc Where S, (f) is the power spectral density function for the acceleration of thevehicle. Finally, we can evaluate the vibration of the vehicle against the limits specified. [5] 3 MODELS OF RIDE In the first step, a quarter car model with one degree of freedomwas considered (Fig 2). IEEE Catalog Number: 06EX13 1 01 1188 0s1

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P r o c e e d i n g s o f t h e 2 5 t h C h i n e s e C o n t r o l C o n f e r e n c e7 - 1 1 A u g u s t , 2 0 0 6, H a r bi n , H e i l o n g j i a n g

F u z z y C o n t r o l f o r A c t i v e S u s p e n s i o n i n ADAMS/Car F u l l V e h i c l e

A z a d e h F a r a z a n d e h , R e z a K a z e m iD e p t . o f M e c h a n i c a l E n g , K h a j e h N a s i r A l d i n e T o o s i U n i v e r s i t y o f T e c h n o l o g yE - m a i l : , k a mc

A b s t r a c t : I n t h i s r e s e a r c h , f u z z y t e c h n i q u e w a s c o n s i d e r e d t o c o n t r o l a n a c t i v e s u s p e n s i o n . T h e m a i n t a r g e t s i n t h i s

s t u d y a r e e l i m i n a t i o n o f t h e b o d y b o u n c e a n d p i t c h i n n o r m a l r i d e a n d r o l l a t t i t u d e a s w e l l a s i t s b o u n c e r e s u l t i n g f r o mr o a d b u m p s , o n i n d i v i d u a l t i r e s b y u s i n g s u s pe n s i o n s y s t e m i n b o t h s i d e o f c a r a n d b o t h a x l e s . I n o r d e r t o h a v e t h ea b i l i t y t o i n t e r p r e t t h e r e s u l t s o f f u l l m o d e l o f v e h i c l e i n ADAMS, t h e m e t h o d o f c r a w l a n d w a l k a n d t h e c l a s s i c m o d e l sw i t h l o we r d e g r e e s o f f r e e d o m w a s u s e d . T h e c o n t r o l l e r s t r u c t u r e w a s d e s i g n e d i n M A T L A B / S i m u l i n k . T h e f u l l p r o c e s sw a s i m p l e m e n t e d u s i n g l i n k b e t w e e n ADAMS a s a M u l t i - B o d y D y n a m i c s S i m u l a t o r & MATLAB a s a c o n t r o ls i m u l a t i o n e n v i r o n m e n t . F i n a l l y r i d e c o m f o r t o f v e h i c l e e q u i p p e d w i t h f u z z y c o n t r o l l e r s h o w s a c o n s i d e r a b l e i n c r e a s ew i t h r e s p e c t t o I S O 2 6 3 1 c r i t e r i a .Key W o r d s : F u z z y C o n t r o l , V e h i c l e D y n a m i c s , R i d e C o m f o r t , B o u n c e , P i t c h , R o l l M o v e m e n t s

1 INTRODUCTIONT h e m a i n f u n c t i o n s o f v e h i c l e s u s p e n s i o n s y s t e m a r e t om i n i m i z e t h e v e r t i c a l a c c e l e r a t i o n t r a n s m i t t e d t o t h ep a s s e n g e r s t o p r o v i d e r i d e C o m f o r t a n d t o m a i n t a i n t h et i r e - r o a d c o n t a c t t o p r o v i d e h o l d i n g c h a r a c t e r i s t i c , a n d t ok e e p t h e s u s p e n s i o n t r a v e l ( r a t t l e s p a c e ) s m a l l . A c t i v es u s p e n s i o n s c a n i m p r o v e t h e c o m f o r t c o n s i d e r a b l y b y t h ea b i l i t y t o c o n t r o l t h e v i b r a t i o n s o f t h e u n s p r u n g m a s s a n dh a n d l i n g o f v e h i c l e . T h e r e f o r e , o n l y a c o m p r o m i s eb e t w e e n c o n f l i c t i n g c r i t e r i a o f r i d e a n d h a n d l i n g c a n b eo b t a i n e d , i f t h e s u s p e n s i o n i s b u i l t f r o m p a s s i v ec o m p o n e n t s , s u c h a s f i x e d r a t i o s p r i n g s a n d d a m p e r s . S ot h e a n s w e r t o t h i s p r o b l e m s e e m s t o b e f o u n d i n t h e

d e v e l o p m e n t o f a n a c t i v e s u s p e n s i o n s y s t e m [ 1 , 2 ] . M o s tC o n t r o l s t r a t e g i e s o f a c t i v e s u s p e n s i o n s y s t e m h a v e b e e nb a s e d o n o p t i m a l o r a d a p t i v e c o n t r o l a l g o r i t h m s s u c h a sm o d e l r e f e r e n c e a d a p t i v e c o n t r o l , e x p l i c i t s e l f - t u n i n ga d a p t i v e c o n t r o l a n d n o n - l i n e a r s e l f t u n i n g c o n t r o l . T h eu s e o f F u z z y l o g i c c o n t r o l f o r t h e d e s i g n o f a c t i v es u s p e n s i o n s y s t e m s h a s b e e n t h e s u b j e c t o f m o r e r e s e a r c hi n r e c e n t y e a r s [ 3 ] . T h e d e r i v a t i o n o f l i n e a r a c t i v e c o n t r o l si n a c l o s e d f o r m f o r t h e s y s t e m n e c e s s i t a t e s t h ea s s u m p t i o n t h a t c a r m o d e l s a r e d e s c r i b e d b y a l i n e a rs y s t e m o r a n a p p r o x i m a t e l i n e a r s y s t e m , a n d t h e

p e r f o r m a n c e i n d e x i s g i v e n a s t h e q u a d r a t i c f o r m o f t h es t a t e v a r i a b l e s a n d t h e a c t i v e c o n t r o l . H o w e v e r , i f c a r

m o d e l s a r e d e n o t e d a s a c o m p l i c a t e d o n e w i t h t h en o n l i n e a r i t y a n d u n c e r t a i n t y , a c t i v e s u s p e n s i o n s w i t hi n t e l l i g e n t a n d n o n l i n e a r s t r u c t u r e o n t h e b a s i s o f f u z z yr e a s o n i n g n e u r a l n e t w o r k , a n d s l i d i n g m o d e c o n t r o l a r ep r o p o s e d f o r s u c h c o m p l i c a t e d m o d e l s . T h e n , t h e a c t i v es u s p e n s i o n s g i v e m o r e s a t i s f a c t o r y p e r f o r m a n c e , b u t n e e dm o r e c o m p l i c a t e d s t r u c t u r e i n t h e c o n t r o l a l g o r i t h m s , t h a nl i n e a r a c t i v e s u s p e n s i o n s . [ 4 ]

2 EVALUATION OF RIDE COMFORTA f t e r t h e p o w e r s p e c t r a l d e n s i t y f u n c t i o n f o r a c c e l e r a t i o no f t h e v e h i c l e h a s b e e n o b t a i n e d , f u r t h e r a n a l y s i s i s

r e q u i r e d t o r e l a t e i t t o a n y r i d e c o m f o r t c r i t e r i o n s u c h a s

s t a n d a r d o f I S O 2 6 3 1 , s h o w n i n F i g ( 1 ) .

00-

4

i -

I ' 05I"-

- 0_X

a e ; -'Sg' ./ I/i

V~ ~ /

Sd

a

s D 0 1 s 20 0 5 0 Z I A z

Cente F i r e q u n y O f T h f i d Oc U Bad

F i g ( 1 ) : I S O 2 6 3 i d i a g r a m f o r v e r t i c a l a c c e l e r a t i o n

T h e n t h e t r a n s f o r m a t i o n o f t h e p o w e r s p e c t r a l d e n s i t yf u n c t i o n i n t o r o o t - m e a n - s q u a r e v a l u e s o f a c c e l e r a t i o n a s a

f u n c t i o n o f f r e q u e n c y i s n e c e s s a r y . A s e r i e s o f d i s c r e t ec e n t e r f r e q u e n c i e s w i t h i n t h e r a n g e o f i n t e r e s t i s f i r s ts e l e c t e d . T o d e t e r m i n e t h e m e a n - s q u a r e v a l u e o f

a c c e l e r a t i o n a t a g i v e n c e n t e r f r e q u e n c y f , , t h e p o w e r

s p e c t r a l d e n s i t y f u n c t i o n i s i n t e g r a t e d o v e r a o n e - t h i r d

o c t a v e b a n d o f w h i c h t h e u p p e r c u t o f f f r e q u e n c y i s a 2 't i m e s t h e l o w e r . I n o t h e r w o r d s , b y i n t e g r a t i n g t h e p o w e rs p e c t r a l d e n s i t y f u n c t i o n o v e r a f r e q u e n c y b a n d o f 0 . 8 9 -

1 . 1 2 f , , t h e m e a n - s q u a r e v a l u e o f a c c e l e r a t i o n a t a g i v e n

c e n t e r f r e q u e n c y f C c a n b e o b t a i n e d . T h e r o o t - m e a n -

s q u a r e ( r m s ) v a l u e o f a c c e l e r a t i o n a t e a c h c e n t e r

f r e q u e n c y ca n b e c a l c u l a t e d b y :

r m s a c c e l e r a t i o n r JS ( f ) d f ( 1 )0 . 8 9 f c

W h e r e S , ( f ) i s t h e p o w e r s p e c t r a l d e n s i t y f u n c t i o n f o r

t h e a c c e l e r a t i o n o f t h e v e h i c l e . F i n a l l y , we c a n e v a l u a t et h e v i b r a t i o n o f t h e v e h i c l e a g a i n s t t h e l i m i t s s p e c i f i e d .[ 5 ]3 MODELS OF RIDEI n t h e f i r s t s t e p , a q u a r t e r c a r m o d e l w i t h o n e d e g r e e o ff r e e d o m w a s c o n s i d e r e d ( F i g 2 ) .

I E E E C a t a l o g N u m b e r : 0 6 E X 1 3 1 0 1

1 1 8 8

0 s 1

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M.

F i g ( 2 ) : q u a r t e r - c a r m o d e l

T h i s m o d e l u s e s a u n i t t o c r e a t e t h e c o n t r o l f o r c e b e t w e e nb o d y m a s s a n d w h e e l m a s s . T h e m o t i o n e q u a t i o n s o f t h ec a r b o d y a r e a s f o l l o w s :

m s x s = - k s ( X s - x u ) - c s ( k s -u ) + f a

m u x u=

- k s ( X U - X s ) - c S ( k U - s ) f a-k u ( X u - X r ) -Cu ( X u -r ) ( 2 )T h e m a t r i x f o r m i s :

M s 0SLSs C s C s c2Xsj

L k s . + k u 1 L u L k u x r +u r f a ] 0M s , m: S p r u n g a n d u n s p r u n g m a s s

XS XU , X r : S p r u n g , u n s p r u n g a n d r o a d d i s p l a c e m e n t

K S K U : S p r i n g s t i f f n e s s o f s u s p e n s i o n s y s t e m a n d t i r e

C S , C U D a m p i n g c o e f f i c i e n t o f s u s p e n s i o n s y s t e m a n d

t i r e

f a A c t i v e f o r c e

T h e n , a o n e - h a l f - c a r m o d e l f o r b o u n c e o r r o l l m o d e l w a sa s s u m e d w h i c h h a s t w o d e g r e e s o f f r e e d o m w h i c h a r eb o d y b o u n c e a n d b o d y p i t c h ( r o l l ) . ( F i g 3 )T h e m o t i o n e q u a t i o n i s g i v e n a s :

[ M ] , X + [ C ] ] X + [ K ] X = [ A ]U r + [ B ] U r + [ D ] U ( 4 )

{ 9

{=1

{i }

Ur Ua } (6 )

F

I o moe

F i g ( 3 ) : o n e - h a l f - c a r m o d e l

[ M ] [ m O ? 1

[ C ] =! Cf+Cr

L - C f L f +Cr L r

- C f L f + C r L r ]

CLj2 + C r L r 2 ]

[ K ] = Kf +K - K f L f +Kr L r[KL KLKL2+KL2-KfLf Kff +KrLr

[ A ] = C f L CrL r 1 [ B ] = K f L t KL]

-Lf L r ]

W h i c h :m B o d y m a s s

I y Moment i n e r t i a o f b o d y

Z , q : B o d y b o u n c e a n d p i t c h

C f , C r , k f , k r : S p r i n g s t i f f n e s s a n d d a m p i n g

c o e f f i c i e n t s o f f r o n t a n d r e a r

Z r f Z r r R o a d i n p u t s t o f r o n t a n d r e a r w h e e l s

4 FUZZY CONTROLF u z z y s e t t h e o r y w a s f i r s t p r o p o s e d b y L . A . Z a d e h .N o w a d a y s , " f u z z y " c o n c e p t h a s b e e n w i d e l y u s e d i nc o n t r o l s y s t e m d e s i g n . I t i s a w e l l - k n o w n f a c t t h a t t h ed e r i v a t i o n o f t h e c o n t r o l n e e d s t h e v e h i c l e d y n a m i c s t o b e

a c c u r a t e l y e x p r e s s e d a s a l i n e a r m o d e l , w h e r e a s t h ev e h i c l e d y n a m i c s g e n e r a l l y i n c l u d e s n o n l i n e a r i t i e s a n du n c e r t a i n t i e s . F o r t h e d e s i g n o f a c t i v e s u s p e n s i o n s y s t e m s ,t h e u s e o f f u z z y - l o g i c c o n t r o l h a s b e e n p r o p o s e d , a n d h a ss h o w n s a t i s f a c t o r y p e r f o r m a n c e [ 6 ] . B a s i c a l l y , a f u z z yl o g i c c o n t r o l l e r h a s g o t t h e f o l l o w i n g c o m p o n e n t s : ( a )T h e f u z z i f i c a t i o n i n t e r f a c e t o s c a l e a n d m a p p e d t h em e a s u r e d v a r i a b l e s t o s u i t a b l e l i n g u i s t i c v a r i a b l e s . ( b ) Ak n o w l e d g e b a s e c o m p r i s i n g l i n g u i s t i c c o n t r o l r u l e b a s e . ( c )A d e c i s i o n m a k i n g l o g i c t o i n f e r t h e f u z z y l o g i c c o n t r o la c t i o n b a s e d o n t h e m e a s u r e d v a r i a b l e s , w h i c h i s m u c ha k i n t o t h e h u m a n d e c i s i o n m a k i n g . ( d ) A d e f u z z i f i c a t i o ni n t e r f a c e t o s c a l e a n d map t h e l i n g u i s t i c c o n t r o l a c t i o n s

i n f e r r e d t o y i e l d a n o n - f u z z y c o n t r o l i n p u t t o t h e p l a n tb e i n g c o n t r o l l e d . [ 7 ] , [ 8 ] . T h e r e e x i s t t w o m a j o r d i f f e r e n t

1 1 8 9

zx=

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t y p e s f u z z y m o d e l w i d e l y e m p l o y e d i n v a r i o u sa p p l i c a t i o n s : t h e M a m d a n i t y p e a n d t h e T a k a g i - S u g e n o( T S ) t y p e . T h e m a i n l y d i f f e r e n c e s b e t w e e n t h e s e t w of u z z y m o d e l l i e i n t h e f u z z y c o n t r o l r u l e c o n s e q u e n t . T h eM a m d a n i f u z z y c o n t r o l l e r s u t i l i z e f u z z y s e t s a s t h ec o n s e q u e n t w h e r e a s t h e T S f u z z y c o n t r o l l e r s e m p l o y

( l i n e a r ) f u n c t i o n o f i n p u t v a r i a b l e a s t h e c o n s e q u e n t . B o t ht y p e s o f f u z z y c o n t r o l h a v e s u c c e s s f u l l y b e e n a p p l i e d t os o l v e p r a c t i c e c o n t r o l p r o b l e m s [ 6 ] .

5 SIMULATION STRATEGYA t t h e f i r s t s t e p t h e s i m u l a t i o n o f c l a s s i c m o d e l s w h i c hd e s c r i b e d i n m o d e l s o f r i d e s e c t i o n , w a s i m p l e m e n t e du s i n g MATLAB/SIMULINK. T h e n , t h e f u l l p r o c e s su s i n g l i n k b e t w e e n ADAMS a n d MATLAB a s a c o n t r o ls i m u l a t i o n e n v i r o n m e n t w a s a p p l i e d . T h e s i m u l a t i o nr e s u l t s h a v e b e e n c o m p a r e d w i t h t h e p a s s i v e v e h i c l em o d e l t o p r o v e t h e a c c u r a c y a n d p e r f o r ma n c e a c c e p t a n c eo f c o n t r o l l e r . T h e f u z z y l o g i c c o n t r o l l e r u s e d i n t h e a c t i v e

s u s p e n s i o n f o r b o u n c e m o t i o n h a s t h r e e i n p u t s : b o d ya c c e l e r a t i o n x5 , b o d y v e l o c i t y x i , b o d y d e f l e c t i o n

v e l o c i t y - < u - a n d o n e o u t p u t : d e s i r e d a c t u a t o r f o r c e

f a [ 9 ] . T h e m e m b e r s h i p f u n c t i o n s f o r b o u n c e c o n t r o l l e r

a n d r u l e b a s e s a r e a s f o l l o w s :

ad t VA t b b 4 e

F i g 4 . I n p u t 1 o f f u zz y c o n t r o l l e r ( b o d y a c c e l e r a t i o n )

Me m h i p fDb6 2 l p l 1616,

F i g 5 . I n p u t 2 & 3 o f f u z z y c o n t r o l l e r ( b o d y d e f l e c t i o n v e l o c i t y )

T a b l e l . B o u n c e r u l e b a s e s

NO Ab Vb Vd F a NO Ab Vb Vd F a NO Ab Vb Vd F a1 ZE PM PM ZE 2 6 N PM PM NS 5 1 P PM PM NM

2 ZE PM P S NS 2 7 N PM P S NM 5 2 P PM P S NS

3 ZE PM ZE NM 2 8 N PM ZE NB 5 3 P PM ZE NB

4 ZE PM NS NM 2 9 N PM NS NB 5 4 P PM NS NB5 ZE PM NM NB 3 0 N PM NM NV 5 5 P PM NM NV

6 ZE P S PM ZE 3 1 N P S PM NS 5 6 P P S PM NS7 ZE P S P S NS 3 2 N P S P S NM 5 7 P P S P S NM

8 ZE P S ZE NS 3 3 N P S ZE NM 5 8 P P S ZE NM

9 ZE P S NS NM 3 4 N P S NS NB 5 9 P P S NS NB

1 0 ZE P S NM NM 3 5 N P S NM NB 6 0 P P S NM NB

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f a c t o r s h a s a s i g n i f i c a n t r o l e i n a c h i e v i n g a no p t i m a l p e r f o r m a n c e .F o r c o n t r o l t h e p i t c h a n d r o l l o f v e h i c l e ,

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p r o p o s e d t o a t t a i n r i d e c o m f o r t a n d g o o d h a n d l i n g . T h i sa i m w a s a c h i e v e d w i t h r e s p e c t t o t h e r e s u l t s o f t h es i m u l a t i o n i n b o t h c l a s s i c a n d f u l l v e h i c l e ADAMS m o d e l .A l s o , w i t h a p p l yi n g t h e f u z z y c o n t r o l , r i d e c o m f o r ts p e c i f i c a t i o n h a s t w i c e i n c r e a s e d .

REFERENCES

[ 1 ] G i l l e s p i e . T h o m a s . D , " F u n d a m e n t a l o f v e h i c l e D y n a m i c " ,1 9 9 2

[ 2 ] S . M . M e h d i A n s a r e y M . 1 - M . M o h a m m a d i a n 2 , " N e u r o -F u z z y A c t i v e S u s p e n s i o n U s e d I n V e h i c l e B o u n c e & R o l lR e d u c t i o n " , P r o c e e d i n g s o f I M E C 2 0 0 4 , I n t e r n a t i o n a lM e c h a n i c a l E n g i n e e r i n g C o n f e r e n c e , D e c e m b e r 5 - 8 , 2 0 0 4 ,K u w a i t , IMEC2004-FM201-CP

[ 3 ] M . J a m e i , M . M a h f o u f , D . A . L i n k e n s , " E l i c i t a t i o n a n df i n e - t u n i n g o f f u z z y c o n t r o l r u l e s u s i n g s y m b i o t i ce v o l u t i o n " , F u z z y S e t s a n d S y s t e m s 1 4 7 ( 2 0 0 4 ) 5 7 - 7 4 ,

E l s e v i e r[ 4 ] S . R o u k i e h , A . T i t l i , " D e s i g n o f A c t i v e a n d S e m i - A c t i v e

A u t o m o t i v e S u s p e n s i o n U s i n g F u z z y L o g i c " , IFAC 1 2 t hW o r l d C o n g r e s s , V . 2 , S y d n e y , 1 9 9 3

[ 5 ] J . Y W o n g , " T h e o r y o f g r o u n d v e h i c l e s " , J o h n W i l e y a n dS o n s , 1 9 7 8

[ 6 ] Y i - P i n Kuo a n d T z u u - H s e n g S . L i , "A C o m p o s i t e E P -b a s e d F u z z y C o n t r o l l e r f o r A c t i v e S u s p e n s i o n S y s t e m " ,I n t e r n a t i o n a l J o u r n a l o f F u z z y S y s t e m s , V o l . 2 , N o . 3 ,S e p t e m b e r . 2 0 0 0 .

[ 7 ] C . C . L e e , " F u z z y l o g i c c o n t r o l s y s t e m s " , f u z z y l o g i cc o n t r o l l e r p a r t , IEEE T r a n s . S y s t e m Man C y b e r n e t . SMC-2 0 ( 1 9 9 0 ) 4 0 4 - 4 1 8 .

[ 8 ] M.V.C R a o a n d V . P r a h l a d , "A t u n a b l e f u z z y l o g i cc o n t r o l l e r f o r v e h i c l e - A c t i v e s u s p e n s i o n s y s t e m s " , F u z z yS e t s a n d S y s t e m s 8 5 ( 1 9 9 7 ) 1 1 - 2 1 .

[ 9 ] K a t e r i n a HYNIOVA a n d A n t o n i n S T R J B R S K Y a n dJ a r o s l a v HONCU , D e p a r t m e n t o f C o n t r o l E n g i n e e r i n g ,F a c u l t y o f E l e c t r i c a l E n g i n e e r i n g , C z e c h T e c h n i c a lU n i v e r s i t y , " F u z z y C o n t r o l o f M e c h a n i c a l v i b r a t i n gS y s t e m s " K a r l o v o n a m e s t i . 1 3 , 1 2 1 3 5 P r a g u e , C z e c hR e p u b l i c

1 1 9 3

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