﻿ Menu Commands > Options Menu > Linear/Log Scaling > Tripartite Options

 Tripartite Options command JR   Viewer

This command allows you to change the appearance of tripartite grids.

Shortcut:

Right-click within an existing tripartite plot and select Tripartite Options.

Units

NOTE:  Changing units does NOT alter the input data in any way. Specifying alternate units informs DPlot how the input is related to certain aspects of the plot. It is up to you to perform any necessary conversions of the input data so that it matches the specified units. See Edit menu.

By default, a tripartite grid is set up for a shock spectra plot with frequency (X) in Hertz, velocity (Y) in inches/sec, displacement in inches, and acceleration in g's. This menu option allows you to select from other built-in relationships, or enter conversion factors for your own tripartite grids.

For shock spectra plots, acceleration and displacement values are given by:

In the more general case,

If you select "user-defined" tripartite units, you must enter positive values for the constants A & B. The following table is presented to provide examples of proper values for A and B:

 X Y 45 deg. 135 deg. A B Hertz inches/sec inches in/sec^2 0.1591549 6.2831853 Hertz inches/sec inches g's 0.1591549 1.6273972E-02 Hertz feet/sec feet g's 0.1591549 1.9528766E-01 Hertz mm/sec millimeters g's 0.1591549 6.4070659E-04 Hertz cm/sec centimeters g's 0.1591549 6.4070659E-03 Hertz meters/sec meters g's 0.1591549 6.4070659E-01

If X represents the period of the oscillation rather than the frequency in cycles/second, the above relationships are simply reversed: The 45 degree lines represent acceleration and the 135 degree lines represent displacement:

 X Y 45 deg. 135 deg. A B seconds inches/sec g's inches 1.6273972E-02 0.1591549 seconds feet/sec g's feet 1.9528766E-01 0.1591549 seconds mm/sec g's millimeters 6.4070659E-04 0.1591549 seconds cm/sec g's centimeters 6.4070659E-03 0.1591549 seconds meters/sec g's meters 6.4070659E-01 0.1591549

Draw intermediate acceleration/displacement lines

By default, grid lines will be drawn for acceleration and displacement values of 1 and 5 times some power of 10, with only the power of 10 lines labeled. If this option is checked, the 0.5, 5., 50., etc. lines will also be labeled, and grid lines will also be drawn at 2, 3, 4, 6, 7, 8, and 9 times a power of 10.

Related macro commands

TripartiteFlags