Directivity

The Directivity plot () is an extension of the far-field plots and is a common acoustic plot for speakers, for example. The plot collects spatial information across frequencies and shows this information in a contour plot.

You can add Directivity plot nodes to 2D plot groups from the More Plots submenu.

Go to Common Results Node Settings for links to information about these sections: Data, Title, Levels, Range, Inherit Style, and Coloring and Style.

The Directivity plot is available with the Acoustics Module.

Expression

For the standard settings, see Expressions and Predefined Quantities. You can also choose a normalization of the data from the Normalization list:

•	Choose With respect to angle (the default) to compute an expression normalized with respect to an specific angle, You specify the angle (in degrees) in the Angle field (unit: deg).

•	Choose With respect to maximum to compute the expression normalized with respect to its maximum value.

•	Choose None to not use any normalization.

Evaluation

Under Angles, enter the resolution. The default is 50.

Select a Restriction: None (the default) or Manual.

If Manual is selected, enter values (SI unit: deg) for:

•	start (the default is 0 degrees)

•	range (the default is 360 degrees)

Under Circle from the list, select Unit circle (the default) or Manual. If Manual is selected, enter values for the x and y coordinates at the center of the circle (SI unit: m). Enter a Radius (SI unit: m). The default is 1 m.

Under Evaluation distance, you can enter that distance in the Radius field (SI unit: m). The default is 1 m.

Coloring and Style

In addition to common coloring and style settings, you can specify the axis for the frequency. From the Layout list, choose:

•	Frequency on x-axis to plot with the frequency on the x-axis.

•	Frequency on y-axis to plot with the frequency on the y-axis.