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l
I SAVE THE OFFSET AND CODE SEGMENT OF THE INSTRUCTION I
' CLEAR THE 8087 EXCEPTION I
LOAD CONTROL WORD, EXCEPTIONS MASKED I
[ SEND EOI TO 8259A I
l
I RESTORE 3"HE STATE OF THE 8086 I
I I
Figure 19. - Flow chart for 8087 exceplion Interrupt service routine.
_ES I LOADRESULTI
-a'_Vlt%l-,__'r-;iv-I'r_ "_"_] ONE.&AALLFEFULL I
.... .......
_ ILOADMESSA_E_TAI RT,N_ADD.ESS
T ES I ,. EUE I
l_s I I
SAVE INSTRUCTION
POINTER AND CODE
SEGMENT REGISTER
WHE RE OVERFLOW
OCCURRED
I SET
OVERFLOW
LATCH
1
LOAD RESULT I
ONE-HALF
FULL SCALE
Figure 20. - Flow c_art for divide Interrupt service routine.
26
t
I FORRESITNAITRIATLIZTAIMTEIORN
I,_V__.¢.,.E ST,_IE
½ IRE"ST'_°'_"_°'S!TE"
PEAL-TIME OPE RATICN
I
I .........................
I i ,'1PUTADDRESS OF ERROR I
' MESSAGE ON QUEUE I
I
I
I UNMASK INTERRUPTS EXCEPT PRECISION I
I SEND EOI TO 825_A S_ I MUX INTERRUPT WORKS
I SOTPOERNE LBOAOSPE SPEOTPINOTISNTSAS
1
IRESTMOARc.SE,.T_.ITE
I DISABLE SAMPLE INTERRUPT I
i
I SAVETHESTATEOFTHEMASKI
I MSUEXNDINTEEORIRTUOPT825W9AORSKOS
i
I ENABLE 1742 BOARD INTERRUPTS I
I RE_MUXCOU_ER I
t
lSTARMTACHINERESTOREI
½
I REENABLE INTERRUPTS I
Figure 21. - Flow chart for timer Interrupt service rcNJtJne.
27
I GET VALUE P(AODINDTREERS,S)MEOFSEEONQD-OF-CXJEUE I
INCREMENT IT BY TWO AND WRAP IT
AROUND MEMORY WHERE QUEUE RESIDES
(2 + MESEOQ) AF
_YE S
I STORE STARTING ADDRESS OF ERROR [
MESSAGE AT END OF QUEUE
(MESQ((2 +MESEOQ)AF])
STORE NEW VALUE OF MESEOQ i
- (2 + MESEOQ)AF J
Figure 22. - Fk_w chart for routine for saving stattlng address of error messages.
I CLEAR INTERRUPT ENABLE FLAG J
i
I GET ADDRESS OF BEGINNING OF MESSAGE QUEUE J
i
I ,NCREAMDEDNRTE,_sXs'L'r,oO" _',',O,O,,UE]UE
!
I STORE NEW ADDRESS OF BEGINNING OF MESSAGE QUEUE I
[ GET ADDRESS OF MESAGE FROM HEAD OF QUEUE J
i,
[ PUSH ADDRESS ON STACK FOR PRINTING ROUTINE I
i
[ SET MESSAGE-IN-PROGRESS FLAG J
l S_,_rERRO.TE_EIF_'G
t
IRESMETESSAGE-,,-,RO_IRESS
I R_°R"I
Fi0ure 23. - Row chart for message generation routine, MESGEN.
28
MESEOQ
OQ
2,
MESEOQ
4.
MESBOQ -- BEGINNING-OF-QUEUE POINTER
MESEOQ -- END-OF-QUEUE POINTER
Figure 24, - Two messages entering queue and being printed.
29
LOAD STARTING ADDRESS OF TIMEOUT MESSAGE J
t
II S AGEII
J GET INSTRUCTION POINTER OF CURRENT INSTRUCTION J
|
i
I GET CODE SEGMENT OF CURRENT INSTRUCTION I
1
| B
J CONVERT THEM TO ASCII I
}
LOAD STARTING ADDRESS OF REST OF MESSAGE
CONTAINING INSTRUCTION POINTER AND CODE SEGMENT
Figure 2S. - Flow chart for system bus tlmeout Interrupt service routine.
3O
Report Documentation Page
Nahonat Ae+o+_ luhcs and
_,p_{. _ Adrnlnrslr _tl+oll
1. Report No. NASA TM-100869 2. Government Accession No.
AVSCOM TR-89-C-00 I
4. Title and Subtitle
A Real-time Simulator of a Turbofan Engine
7. Author(s)
Jonathan S. Litt, John C. DeLaat, and Waiter C. Merrill
9. Performing Organization Name and Address
NASA Lewis Research Center
Cleveland, Ohio 44135-3191
and
Propulsion Directorate
U.S. Army Aviation Research and Technology Activity--AVSCOM
Cleveland, Ohio 44135-3127
12. Sponsoring Agency Name and Address
National Aeronautics and Space Administration
Washington, D.C. 20546-0001
and
U.S. Army Aviation Systems Command
St. Louis, Mo. 63120-1798
15. Supplementary Notes
Jonathan S. Litt, Propulsion Directorate; John C. DeLaat and Walter C. Merrill,
3. Recipient's Catalog No.
5. Report Date
March 1989
6. Performing Organization Code
8. Performing Organization Report No.
E-4578
10. Work Unit No.
505-62-0 I
11. Contract or Grant No+
13. Type of Report and Period Covered
Technical Memorandum
14. Sponsoring Agency Code
NASA Lewis Research Center.
16, Abstract
A real-time digital simulator of a Pratt and Whitney FI00 engine has been developed for real-time code verification
and for actuator diagnosis during full-scale engine testing. This self-contained unit can operate in an openloop
stand-alone mode or as part of closed-loop control system. It can also be used for control system design and
development. Tests conducted in conjunction with the NASA Advanced Detection, Isolation, and Accommodation
　
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