Variability Study

Variability Study allow you to examine how squeak and rattle risks are affected by manufacturing variations.

The manufacturing of parts is often related to variations of tolerances and quality of materials. In addition, the assembly process adds a set of variations on dimensions and stiffness of connections, resulting in a unique product at each build. These two major processes affect the product final quality and therefore its performance.

Squeak and Rattle are phenomena that are tightly related to the quality of the built parts, and performance can vary through the population of produced products.

Prerequisites:
  • All previous steps in the process need to be performed.
  • All E-Lines of interest and a dynamic loadcase must exist in the model.
  • HyperStudy is required to execute DOE/Stochastic study.
In SnRD, the following model parameters can be used as design variables* in the study:
  • Component Thickness
  • Material Characteristics
    • Youngs' Modulus
    • Density
  • Attachment Stiffness
  • Damping
Note:
  • *A design variable is a system parameter that influences the system performance in the chosen output response. Typical design variables may be a part's thickness or material property. Ranges, with lower and upper bounds, are specified and the variable's value will vary within the study.

Variability Study Setup

  1. From the Setup group, select Variability Study.
    Figure 1.
  2. Select the type of model parameter to include in the variation study.
  3. Select properties/curves/material in the graphics area or by using the advanced selection dialog.
  4. In the micro-dialog specify the lower and upper bounds for the variation.
    Figure 2.
  5. Optional: Click on to update the name.
  6. Click .
    Variation studies with design variables created for all selected study parameters.
    Restriction: Variability Study is only supported for Dynamic Event and only one loadcase at a time. You can select which load case to include in the study at export.
  7. Optional: Review and edit the created Variation Studies and Variables in Review Variation Study Table:
    Figure 3.
Refer Model Export to know more about exporting the variation study.