Altair Squeak and Rattle Director 2021.2 Release Notes

The Squeak and Rattle Director (SnRD) has been included in HyperWorks since v.2021. Hence the SnRD pre and post-processing modules are available without any separate installation.


The main focus areas for this release are:
  • Easily compare SnR Risk for all E-lines from multiple design iterations and/or load cases.
  • Enhanced Dynamic Event creation with the added control of name and scale factor.
  • Pause and Resume E-line creation.


Loadcase Enhancements
Scale loads differently for each direction through a scale factor. This can be done both at the creation of the dynamic event as well as through the Review Loadcase table.
Figure 1.
Figure 2.
Create Dynamic Load from existing Curve data
If curve data already exists in the right format (TABLED1) in a model, you can now use these in dynamic event load case creation directly. You will be prompted to select a load curve for each direction.
Figure 3.
Static Loadcase Enhancements
For a Quality Feel Investigation (Static Event), multiple points are required to be evaluated separately. To ease this setup, there is an option to create one static load case for each selected node in static event creation.
Figure 4.
E-line Enhancements
Name and Renaming of E-lines
For better organization and review of E-lines in post-processing, you can name E-lines directly in the Review E-lines Table. You have an option to select from an existing list of names that are imported from the DTS file or enter a new name manually.
Figure 5.
Pause E-line Creation
You can now pause the creation and realization of E-lines.
Figure 6.
Lock of E-line IDs
To avoid issues caused by manual renumbering in HyperWorks, the IDs of the nodes belonging to E-lines will be locked. Thus, it will not be renumbered through HyperWorks renumbering functionality unless unlocked in ID-Manager. Now the renumbering of E-lines can still be performed through Manage E-line Table.
Risk Assessment Enhancements
SnR Risk Comparison
Comparison between design iterations and/or loadcases is made easier as the Max Rel Displacement for all Active Results is visualized in the BarPlot.
Figure 7.
Show Names in Overview Bar Plot
Show names of E-lines instead of IDs in the Bar Plot in Risk Assessment Overview.
Figure 8.
General Enhancements
Model Files Removed from Installation Package
To reduce the footprint size, the following tutorial model and demo model files are no longer included in the local installation. You can now find zipped tutorial model files and demo model files on Altair One via the Altair Community, Altair Marketplace, and Altair Connect sites. Altair recommends that you create an Altair One account and use it as your primary portal to access product documentation, a Knowledge Base, and customer support.
Tutorial Model Files
  • HyperWorks
  • Squeak and Rattle Director

Known Issues

The following known issues will be addressed in a future release as we continuously improve the performance of the software:
SnRD Pre
  • Long Realization time of E-lines in large models.
SnRD Post
The following post-processing functionalities are not supported in this version:
  • Comparing Squeak Results from multiple load cases.
  • Comparing multiple load cases from different files with the same load case ID.
  • Combined Loading with a model which only consists of Squeak lines.
  • Loading a model file from a network location (unless it’s mapped to a drive).

Resolved Issues

All issues reported in the previous versions are fixed in this version (besides the previously mentioned limitations):
  • SineSweep curve was generated wrong for a certain set of values,this is resolved.
  • A full installation of Compose is no longer a requirement to run SnRD.