HyperGraph

Order Analysis

Order Analysis

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Order Analysis

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Background, engine related noise, and vibration problems are typically linked to engine orders that are harmonic multiples of the engine’s fundamental firing frequency. Understanding the order content of the problem signal is a way to identify the physical phenomenon that is causing the problem.  To solve the problem, you can adjust the design parameters to modify the engine operation, which in turn reduces the problem orders.

The NVH Order Analysis Utility generates and post-processes engine order related data from an OptiStruct or Nastran frequency response analysis that contains either RPM-based loading subcases or order-based loading subcases.

hmtoggle_plus1To launch the Order Analysis NVH utility:

When you launch HyperGraph 2D, the NVH preferences file is automatically loaded.  However, you must activate the NVH Utilities preferences file before you can use the utility.

1.From the File menu, select Load > Preference File.
2.From the Preferences dialog, select NVH Utilities and click Load.

pref_dialog

Preferences dialog

The NVH menu is added to the toolbar.

3.From the NVH menu, select Order Analysis.

nvh_menu

NVH menu

An NVH-Utilities tab is added to the browser.  This browser tab contains the following sub-tabs: Load, Display and Study.  It also contains icons for modal participation, modalParticipation-24, and order cut analysis, orderCutAnalysis-24.  Select an icon to toggle between utilities.

hg_nvh_utility_load_order_subcase_tab

NVH-Utilities Browser - Load tab/Subcase tab (Order Analysis)

4.To close the NVH-Utilities tab, click on the X in the upper right corner of the dialog.

See Also:

Order Analysis - Load Tab

Order Analysis - Display Tab

Order Analysis - Study Tab

Display Options Dialog

Filter Contributors Dialog