By Cornelius T. Leondes
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E. W A L L H A G E N , and D. J. ARPASI, "Self-Teaching Digital-Computer Program for Fail-Operational Control of a Turbojet Engine in a Sea-Level Test Stand," N A S A TM X3043 (1974). 5. F. J. HRACH, D. J. ARPASI, and W. M. B R U T O N , "Design and Evaluation of a Sensor FailOperational Control System for a Digitally Controlled Turbofan Engine," N A S A T M X-3260 (1975). 6. S. H. ELLIS, In Third International Symposium on Air Breathing Engines" (D. K. Hennecke and G. ), pp. 171-186. Dtsch. Ges.
T h i s m e a s u r e m e n t will b e r e p r e s e n t e d b y t h e s t o c h a s t i c differential equation (3) dyt = h'
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 . B o t h h a r d a n d soft failures m u s t b e c o v e r e d o v e r t h e full r a n g e of e n g i n e p o w e r a n d flight c o n d i t i o n s . A c o m p o n e n t - t r a c k i n g m o d u l e , w h i c h tunes the engine model to m a t c h the actual engine by updating engine model d y n a m i c s t a t e s , i n p u t s , o u t p u t s , a n d c o m p o n e n t p e r f o r m a n c e p a r a m e t e r s , is u s e d t o e x t e n d F I C A t o i n c l u d e a soft failure D I A c a p a b i l i t y .