HyperWorks Tools

View Data

View Data

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View Data

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The View Data tab lets you specify, plot and view your data. The tab is divided into three working sections: Dynamic Data, Static Data, and Curve and Plot Properties. A fourth section displays a static image of the Conceptual Cubic.

•Select the View Data tab, and the following page appears:

view_data_tab

 

From the View Data tab, you can define the following:

hmtoggle_plus1greyDynamic Data

This is the area of the View Data tab where you can define the display layout for dynamic stiffness and loss angle measurements. You have the option of sorting your data by Direction, Amplitude and Preload. The default setting displays all data for a direction first. For each direction, data for a specific amplitude is displayed in a plot window. In each plot window several curves are drawn—one for each preload. Each curve is the graphical representation of the dynamic stiffness (loss angle) vs. frequency relationship.

You can also specify whether the dynamic stiffness and loss angle are to be plotted in the same window or in separate windows (default). You select a checkbox to indicate your preference.

 
hmtoggle_plus1greyStatic Data

This is the area of the View Data tab that displays the static properties derived from the experimental measurements. The tab includes three representation options for the static data.

Static Data Representation

Description

Spline Data

This is data obtained from the static testing of the physical bushing that is stored in the .spd file.

Conceptual Cubic

This is a cubic polynomial that approximates the spline data. The figure in the View Data tab above explains how a nonlinear spline is approximated with two cubic splines. For more information, see Features of the Altair Bushing Model and refer to sections on Stiffness Force Models, Damping Force Models, and the Bushing Property File (.gbs).

Constant Stiffness

This is a linear fit to the spline data. The slope at the operating point, OS, is used to represent the bushing stiffness in that direction. Note that constant damping as a default is assumed to be 1% of the constant stiffness.

 
hmtoggle_plus1greyCurve and Plot Properties

The Curve and Plot Properties options let you define the line-style and line-thickness for dynamic stiffness and loss angle curves. The default option is a line-style and coloring scheme that shows the most contrast between the curves.

 

view_data_tab_plot_prop

 

Option

Description

Common axis range for curve plots

This option specifies that all plots for dynamic stiffness or loss angle use a common range for the x- and y-axes. Using the same axis range is useful for visually examining the curves.

Note: If the option is not selected, the MIT determines the range for each plot, which is useful when you need more detail.  In addition, HyperGraph lets you manually zoom in and out on the curves.

Start y-axis at zero

This option lets you specify that all plots for dynamic stiffness or loss angle start with a y-value of zero. This option is useful when you want to zoom out and visualize experiment and model behavior on an absolute scale.

 
hmtoggle_plus1greySpecifying and Viewing Data Plots

A series of four buttons at the bottom of the View Data tab lets you do the following:

Option

Description

Save Settings

Saves dynamic data, curve, and properties preferences for reuse.

Load Settings

Loads previously saved preferences for dynamic data and curve and plot properties.

Append Plots

Appends new curves to an existing HyperGraph session.

New Plots

Clears the HyperGraph session and plots new curves for dynamic and static data.

 

You can use the New Plots button to plot dynamic and static data as follows:

 

Dynamic Data

Dynamic data is plotted according to the scheme you define in the Dynamic Data section of the View Data tab. The following sample plots show Dynamic Stiffness vs. Frequency for various amplitudes for the FX direction:

displacement amplitute

The following are sample plots for Loss Angle vs. Frequency for various amplitudes for the FX direction.

displacement amplitute2

Static Data

Following are two plots for static data. Each plot contains three curves: the red curve indicates experimental data, the blue curve indicates the conceptual cubic, synthesized from the static data, and the black curve indicates constant stiffness.

The following plot shows the Force vs. Displacement behavior for the three curves:

force_displacement

The following plot shows the Stiffness vs. Displacement behavior of the bushing.

stiffness_displacement