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

By Cornelius T. Leondes

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W h e r e h a r d failures c a n b e d e t e c t e d a l m o s t i n s t a n t l y , soft failures a r e r e l i a b l y d e t e c t e d o n l y after s o m e finite a m o u n t of t i m e . T h i s t i m e t o d e t e c t is a f u n c t i o n of t h r e s h o l d level, w h i c h d e t e r m i n e s d e t e c t i o n reliability, r e q u i r e d m o d e l a c c u r a c y , a n d logic c o m p l e x i t y . U s u a l l y for soft failures, m o r e t i m e is a v a i l a b l e before a c c u m u l a t e d e r r o r is d a m a g i n g .

A slight d r o p in a c t u a l n o z z l e p r e s s u r e c a n b e seen b u t t h i s is a c c e p t a b l e . I n all o t h e r c a s e s t h e a c c o m m o d a t e d single failure t r a n s i e n t p e r f o r m a n c e w a s g o o d . T h e f l u c t u a t i o n s e v i d e n t in n o z z l e p r e s s u r e a t t h e h i g h p o w e r level a r e c a u s e d b y a n a i r f l o w i n t e r a c t i o n b e t w e e n t h e a l t i t u d e test cell a n d the engine. The second a c c o m m o d a t i o n performance experiment demonstrated the e x c e l l e n t a c c u r a c y of t h e e n g i n e m o d e l .

M o s t failures w e r e d e t e c t e d a n d a c c o m m o d a t e d . H o w e v e r , a r e c r e a t i o n of a b r o k e n line ( h a r d ) P B failure w e n t u n d e t e c t e d . P i l o t r e s p o n s e t o aircraft p e r f o r m a n c e after a c c o m m o d a t i o n was favorable. E. ANALYTICAL R E D U N D A N C Y TECHNOLOGY FOR ENGINE RELIABILITY IMPROVEMENT A R T E R I [ 4 1 ] is a p r o g r a m t o d e v e l o p A R t e c h n i q u e s b a s e d o n F I C A t o t h e p o i n t w h e r e t h e y m a y b e e m p l o y e d in a full-scale e n g i n e d e v e l o p m e n t p r o g r a m .

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