Advances in aerospace systems dynamics and control systems. by Cornelius T. Leondes

By Cornelius T. Leondes

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T h e t o l e r a n c e is e s t i m a t e d b y s t a t i s t i c a l a n a l y s i s a n d a d j u s t e d d u r i n g s i m u l a t i o n trials. A c c o m m o d a t i o n of failures is a c c o m p l i s h e d b y r e p l a c e m e n t of s e n s e d v a l u e s w i t h e s t i m a t e d v a l u e s . A n o n l i n e a r r e a l - t i m e s i m u l a t i o n e v a l u a t i o n of t h e F I C A logic s h o w e d t h a t t h e filter e s t i m a t e t r a c k e d t h e s e n s e d v a l u e s w i t h i n t h e specified t o l e r a n c e a n d successfully d e t e c t e d , i s o l a t e d , a n d a c c o m m o 3 d a t e d all h a r d s e n s o r failures e x c e p t f u e l - m e t e r i n g v a l v e p o s i t i o n .

Engine acceleration-deceleration response with exhaust nozzle pressure failure: (a) fan speed and (b) exhaust nozzle pressure. S E N S O R F A I L U R E D E T E C T I O N FOR JET E N G I N E S 10X10 25 3 r a 5 10 15 20 25 TIME, SEC Fig. 10. Open-loop acceleration-deceleration: (a) fan speed and (b) exhaust nozzle pressure. WALTER C. MERRILL 26 p r o c e d u r e s , i n c l u d i n g F O R T R A N a n d floating-point a r i t h m e t i c , w e r e u s e d . P a r a l l e l p r o c e s s i n g w a s a l s o u s e d a n d s h o w n t o b e a n effective a p p r o a c h t o a c h i e v i n g a r e a l - t i m e i m p l e m e n t a t i o n u s i n g off-the-shelf (cost-effective) c o m puter resources.

F a u l t s w e r e i n t e n t i o n ally p r o d u c e d t o e v a l u a t e effectiveness. S u b s e q u e n t sea-level a n d a l t i t u d e fullscale e n g i n e t e s t s u n c o v e r e d n o n e w p r o b l e m s w i t h t h e D I A logic. A series of flight t e s t s of a F l 5 aircraft w i t h a n F 1 0 0 e n g i n e a n d D E E C c o n t r o l f u r t h e r d e m o n s t r a t e d t h e D E E C l o g i c [ 3 9 ] . D u r i n g t h e flight p r o g r a m , t h e D E E C D I A logic d i d n o t d e t e c t a n y false a l a r m s a n d d i d n o t c a u s e a n y r e v e r s i o n s t o b a c k u p h y d r o m e c h a n i c a l c o n t r o l .

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