FREQUENTLY ASKED QUESTIONS

• Question: What collision model does Virtual CRASH use?

  • Virtual CRASH uses the Kudlich-Slibar rigid body impulse model. Virtual CRASH also has a multi-point contact impulse-momentum model. Deformation of the vehicle shells can be enabled, but note this is not a SMAC-based model.

• Question: What numerical integration methods are being used by the simulator?

  • Virtual CRASH has two numerical integration options available: (1) a fast sequential integration (iterative error correction) which uses a mixed Euler and Runge Kutta method, and (2) full integration which uses a complex NxN matrix with a mixed Euler and Runge Kutta method.

• Question: Is it possible to change vehicle properties?

  • Yes. Vehicle properties can be changed using the control panel in the left column.

• Question: Is the dummy model poseable? Does it have joint stiffness properties or is it just a rag doll?

  • Yes, the human model is poseable. All of the human model’s properties can be changed using the control panel in the left column. You can also pose the model interactively using the joint control grips.

• Question: Is it possible to modify the coefficient-of-friction between the roadway and vehicle or roadway and human model? Can the user input various “friction zones” across the scene?

  • Yes. In Virtual CRASH the user has complete control over the coefficients-of-friction between all objects that can interact. The user can input as many “friction zones” as needed using the various shape drawing tools.

• Question: Has Virtual CRASH been validated?

  • Yes. The Virtual CRASH physics model has been the subject of many studies. Virtual CRASH performance has been compared against standard references such as RICSAC and JARI, as well as other staged experiments, and has been found to reproduce experimental results to excellent agreement. Please find more information on articles and validation studies on our website.