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SYSTHLP.ENG
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1995-11-27
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*** SYSTEM DATA ***
Directly after the system data are inputed, one way or the other,
poles, zeros, gains, numerator and denominator polynomials and for
discrete systems the sample time, are assigned to determined vari-
ables. These variables, and therewith the data, are available in the
whole program. The system to which these data belong, is the active
system. When the next system is made active, the former system is
stored on a page in the scratch pad. The scratch pad has 5 of these
pages. When the 6th system is offered to the scratch pad, the system
that was input first is deleted and therefore lost. You may leaf
through the scratch pad with <PageDown>. With <Enter> you may
activate the visible system, which is then removed from the scratch
pad. The up till then active system is written to the scratch pad.
To distinguish between systems on the scratch pad we may give them a
name.
Systems used in the program part MATRIX are represented by their
state equations. However these systems also have poles, zeros and
polynomials. These poles, zeros and polynomials are either active
or written on the scratch pad. Every scratch pad page therefore has
4 subpages for 4 different sets of state equations of the same
system. The subpages can only be made visible in the MATRIX program
part.
Page arrangement of the scratch pad
───────────────────────────────────
poles and zeros state equations
┌──────────┐ ┌────────┐
│ name │ │ name.1 │
│ ├────┤ ┌──────┴─┐
│ │ │ │ name.2 │
│ │ │ │ ┌──────┴─┐
│ │ └─┤ │ name.3 │
└─────┬────┘ │ │ ┌──────┴─┐
│ └─┤ │ name.4 │
│ │ │ │
v └─┤ │
5 X │ │
└────────┘
Save
────
System data can be stored in a permanent file by pressing F2. This
applies to the system data poles, zeros, gains, sampling time and
polynomials. State data are stored under the MATRIX program. The
data files with poles, zeros, gains and polynomials automatically
have the extension .DFL. You must choose the main part of the file
name. With <Alt-D> you may select another directory for your *.DFL
files. The directory selection remains the same for subsequent *.DFL
file operations, until you select another directory.
Change
──────
With F6 you may change data of the active system. The system order
cannot be changed. Also systems on the scratch pad cannot be chan-
ged. Press F6 and in the lower right corner of the screen a menu
will appear. Select whether you want changes in poles and zeros, or
in the polynomials, or (for analog systems only) in the corner
frequencies of the Bode plot. After the selection the data are
shown. You may select the variable you want to change with the arrow
keys. The new value is typed in and is terminated with <Enter>. As
soon as a change has happened, the system has no name. You may then
enter a new name. When all the changes are input, you return to
the active screen with F6. The system that was active before the
change is written to the scratch pad.
In the poles and zeros presentation you cannot change from real
poles and zeros to complex ones. The other way round can be done
in 2 steps: first you make the imaginary parts zero, then you return
to the active screen, then you select change again and you give the
real parts the desired values. The same procedure applies to the
corner-frequencies presentation although there you must start by
making the damping factor one.
Delete
──────
A not-active system may be deleted from the scratch pad. Select the
system by paging (<PageDown>) and press <Del>. The program asks if
you really want to delete the system. If so you answer with <Y>.
After that the system is deleted from the scratch pad and its place
becomes available for another system.