Variability Study

Use a variability study to examine how squeak and rattle risks are affected by manufacturing variations.

Before conducting a variability study, verify the following:
  • All previous steps in the process must be completed.
  • All E-Lines of interest and a dynamic loadcase must exist in the model.
  • HyperStudy must be installed to execute DOE/Stochastic study.

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 processes heavily affect the quality and performance of a product.

Squeak and rattle are phenomena that are tightly related to the quality of the built parts.

A design variable is a system parameter that influences the system performance in the chosen output response. For example, a part thickness or material property are design variables. Ranges, with lower and upper bounds, are specified and the variable's value will vary within the 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