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loop containing INLET and EMODEL. In the spare tlme in this loop, MINDS runs,
allowing the values of variables and flags to be changed. The MINDS variable
definitions must elther be entered by hand or loaded from dlsk. Choose the
mode In which the program is to be run. Thls can be changed at any tlme very
simply. The default mode Is Initlallzation/hybrld/open-loop. Each switch
(flag) can be changed Independently.
6. Altitude and Mach number, ALT and XMO respectively, can be changed
through MINDS. They are both initialized to 0.0, i.e., sea-level static condltlons.
Power lever angle is Initialized to 83 ° . The ambient conditions, which
are all calculated in INLET, depend on these values. The ambient conditions
are initialized to standard day conditions, I.e., about 14.7 psl and about
59° F. For changes of these two variables to have any affect, the program must
go through the Initialization loop one time. The base points are calculated
here and their values are stored for the additional purpose of being the setpoints
In the open-loop mode.
7. Setting the value of RLOOP to I puts the slmulation into the real-tlme
run loop. The routines take about lO msec to run leaving approximately 2 msec
for MINDS provided there are no error messages to be printed. In this mode,
MINDS can be used to check the value of varlables and to switch modes.
8. Setting RLOOP to 0 again returns the program to the inltiallzatlon
loop but leaves the value of every variable unchanged. Thus a transient can
be stopped and restarted (If the program Is In open-loop mode) or the operating
conditions can be altered to move the system to another operating point.
9. To stop the simulation, reboot the system by presslng the RESET button
on the chassis w|th the system disk in drlve a:.
IO
Ilt 1
ROUTINE
ACTUAT
ALTABL
ClMDAC
EMODEL
EVOLVE
EXEC
FUN1
FUN2
FUN3
HFTA
INLET
APPENDIX B
DESCRIPTION
This FORTRAN subroutine simulates the actuator dynamlcs and lags each
one to approximate the sensor dynamics on each actuator's output.
The scheduled value of nozzle area computed In RPLIMD Is used in the
nozzle area simulation except in the actuator mode where the scheduled
value of nozzle area is calculated based on TT2 provided as an
analog input to the simulation.
This FORTRAN subroutine takes the altitude and returns the 6 and e
corresponding to the ambient conditions.
This assembly language program takes a 16-bit scaled Integer and converts
the twelve most signiflcant bits to analog for output over a
specified digital-to-analog converter channel.
This FORTRAN subroutlne calculates ub, x b, and Yb from the reference
point schedules and computes the elements of the F, F-IG, H,
and D matrices by evaluating functions of the amblent conditions
and reference point schedules.
This FORTRAN subroutine uses Euler integration to compute the current
values of the engine outputs. It also simulates the output sensor
dynamics by lagging each output.
This assembly language program Is the maln routine for the FIO0 slmulatlon.
It calls the other major subroutines and contalns the interrupt
service routines.
This assembly language program does a table look-up and interpolation
on a function of one variable.
This assembly language program does a table look-up and interpolation
on two functions simultaneously where the functions use the same
independent variable and the values of the two functions are known
for the same values of the independent variable.
This assembly language program does a table look-up and interpolatlon
on two functions simultaneously where the functions use the same
independent variable and the values of the two functions are known
for different values of the independent variable.
This FORTRAN function returns enthalpy as a function of temperature.
This FORTRAN subroutine calculates the inlet conditions of the
engine, TT2 and PT2, and the compressor inlet temperature, TT25. The
dynamlcs of the temperature and pressure sensors are included for
completeness but are multiplied by zero. The sensor dynamics are not
used because the simulation Is a steady-state model and is only accurate
at the specified operating points, not between them.
II
MESSAGE
MINDS
MSET
MTRXST
NEFG
PRCMB
PVAL
RFUNI S
RPFAND
RPLIMD
TFHA
This routine, part of the MINDS Library, prints an ASCII string on
the console.
Microcomputer l_.NNteractiveData System Is a program used to examine
and change memory locations in 8086-based systems. Because of memory
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