Vehicle Standard (Australian Design Rule 59/00 – Standards For Omnibus Rollover Strength) 2007
3. Requirements for the algorithm and si3. Requirements for the algorithm and simulation program, and for computing equipment
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3. Requirements for the algorithm and simulation program, and for computing equipment
3.1. The position of the vehicle in unstable equilibrium at point of rollover, and the position at first contact with the ground shall be specified. The simulation program may start at the
unstable equilibrium position, but shall start, at the latest, at the point of first contact with the ground.
3.2. The initial conditions at the point of first contact with the ground shall be defined using the change of potential energy from the unstable equilibrium position.
3.3. The simulation program shall run, at least, until the maximum deformation is reached.
3.4. The simulation program shall produce a stable solution, in which the result is independent of the incremental time step.
3.5. The simulation program shall be able to calculate the energy components for the energy balance at every incremental time step.
3.6. Non-physical energy components introduced by the process of mathematical modelling (for example, "hourglass" and internal damping) shall not exceed 5 per cent of the total energy at any time.
3.7. The friction coefficient used at the ground contact shall be validated with physical test results, or the calculation shall prove that the friction coefficient chosen produces conservative results.
3.8. All the possible physical contacts between parts of the vehicle shall be taken into account in the mathematical model.