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Data Processing command (Options menu)

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This command allows you to enter a data processing mode in which several operations are automated. The key features of data processing mode are geared towards producing data plots used by specific organizations and may not be appropriate for your use.

Formatting

Square format:
Plot width and height are 5.15 inches (about 131 mm).
Both the X and Y axes have 10 grid intervals.
Wide format:
Plot width is 6.15 inches; height is 3.69 inches.
X axis has 20 grid intervals; Y axis has 12 grid intervals.
Scaling is linear X, linear Y.
Pen width is 1 dot or pixel for curves, 0.02 inches for the box around the plot, and 1 dot or pixel for the grid lines.
All labels use the Arial TrueType font. Normal text is 10pt; the first title line is 18pt; all other text is 14pt.

Units

Input units should correspond to the following table. If the input units do not match the values specified, you should not select "Use DPlot-generated axis labels".

Data type

Input X

Input Y

Output X

Output Y default units

Unknown

don't care

don't care

same

same

Pressure

Time, msec

Pressure, psi

Time, msec

Pressure, psi

Impulse, psi-sec

Stress

Time, msec

Stress, psi

Time, msec

Stress, psi

Impulse, psi-sec

Acceleration

Time, msec

Acceleration, g's, feet/sec^2, inches/sec^2, or meters/sec^2

Time, msec

Acceleration, same units as input

Velocity, feet/sec

Displacement, inches

Deflection

Time, msec

Deflection, inches

Time, msec

Deflection, inches

Strain

Time, msec

Strain

Time, msec

Strain

Temperature

Time, msec

Temp., deg. F

Time, msec

Temperature, deg. F

For acceleration plots you may specify the units of the input acceleration as well as the generated velocity and displacement curves. Output acceleration units must match the input units. For other data types the input units are only critical to the axis labels produced by DPlot if "Use DPlot-generated axis labels" is checked, since any integrations performed are simply the input values times time. For acceleration records, however, the unit selection must be correct, whether "Use DPlot-generated axis labels" is checked or not.

Y axis labels will be the same color as the corresponding curve, regardless of the color chosen with the Fonts command.

Menu Commands

Several menu commands are disabled when in data processing mode:

Erase a curve.
Swap X,Y.
Linear/Log scaling.
Multiple axes.
Compare curves.
Curve fit.
Integrate a curve.
Lump two curves.

In addition, the decimation commands do not generate a new curve ... they replace the curve that is operated on.

Integrations

For records consisting of pressure or stress values, DPlot automatically generates an impulse record. For acceleration records, DPlot automatically generates velocity and displacement records.

Editing the primary record in any way (pressure, stress, or acceleration) results in automatic re-generation of the integrated records. Please note:  The initial amplitude of an integrated record will always be zero. Some operations on the primary record may have an undesirable or unexpected effect on integrated records. For example, truncating a pressure record (deleting data before a specified time), may result in shifting the impulse. To view or print a range in time without changing the integrated amplitudes, zoom in to the desired limits or use the Extents/Intervals /Size command rather than truncating the primary record.

Generated records (impulse, velocity, or displacement) can not be edited directly. Any changes must be made to the primary record.

Acceleration plots

Acceleration is plotted on a separate plot from velocity and displacement. To switch views from acceleration to velocity, select the Velocity/Displacement command on the View menu (or press Shift+TAB). Switching to the velocity plot changes this menu command to "Acceleration".

To save a single curve, the curve must be visible. For example, to save either the velocity or displacement records using the Save As command, switch views if necessary so that the velocity plot is visible.

Array sizes

Since data processing mode relies on DPlot being able to make very specific assumptions about the content of the curves, you cannot change the maximum number of curves while in data processing mode. Doing so turns data processing mode off.

 


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