Altair Squeak and Rattle Director 2021 Release Notes


In this release, Squeak and Rattle Director (SnRD) is available within the HyperWorks suite. The SnRD Pre and Post-processing modules are available without the need for PSO installation.

The main focus areas are:
  • Enhanced user experience
  • Intuitive and highly automated engineering workflows
  • Built-in industry best practices and engineering data
  • Single platform for the designer, part-time analyst, and NVH-S&R CAE expert

The Squeak and Rattle analysis and investigation are available at every stage of the product development cycle, even when little or no data is available. This helps the analysts to drive the design changes by utilizing simulation, parallel to the design process.

New Features

New SnRD Ribbon
There is a new SnRD ribbon.

Figure 1.
It includes the following options and buttons:
Import model, configure files, create and manage evaluation lines, define loadcases, and setup variability studies.
Export solver ready OptiStruct (.fem), model file (.hm), and HyperStudy template file for DoE and Stochastics run. Perform a quick risk assessment for the solved model containing evaluation lines.
Risk Assessment
Perform a quick assessment of squeak and rattle risks in the model without switching to HyperView for post-processing on the SnRD Post module.

Figure 2.
SnRD Post
Post process results to study and understand squeak and rattle issues in the model using SnRD Post on HyperView. SnRD Post is now available in HyperWorks.

Figure 3.
2D Squeak Plot
Plot the relative displacement in the contact plane for better squeak evaluation. This plot is useful to fully understand the movement in the contact plane and the principal directions.

Figure 4.
Single Point E-Line using Element to Element Creation
Create a single point E-line by selecting two elements. For example, create diagonal E-lines to track opening distortion, flexible attachments such as clips/snaps or other one point E-lines.


Save Session
Save and restore all progress made in SnRD in an .HM database.
Define Interfaces
Creation of geometrical lines can be controlled with advanced options, such as combining and splitting.

Figure 5.
Manage E-Lines
Renumber E-lines through the E-line review table, one at a time or in bulk by entering a range.

Figure 6.
Material Mapping via a separate tab in E-line review table. When connected, all materials pairs in Ziegler database can also be mapped.

Dynamic Event
Control solver settings with advanced options in Dynamic Event creation.

Known Issues

  • Due to a necessary check for improved stability, loading a result file in SnRD Post and Risk assessment takes longer in this version.
  • Loading and comparing results from two load cases from two different result files with the same load case ID is not supported.

Resolved Issues

All issues reported in the previous versions are fixed in this version.
  • E-line creation and realization performance, negatively impacted in the previous release, are now fixed.
  • Numbering convention of E-lines is further improved and solved issues related to renumbering of E-lines.