Energy Accuracy Tolerance

This is the main driver to the automatic time stepping. The automatic time stepping algorithm measures the portion of potential and kinetic energy that is contained in the highest order terms of the time integration scheme, and computes the ratio of the energy to the energy variations over the previous time steps. Comparing the ratio to the Energy Accuracy Tolerance, Workbench will decide to increase or decrease the time step. See the Preparing a Rigid Dynamics Analysis section for more information.

When implicit time integration is chosen and automatic time stepping is enabled, the energy accuracy tolerance can be turned off. The time step is then determined by the number of iterations required by Newton-Raphson convergence.

Force Residual Relative Tolerance

Controls the threshold for force residual convergence in Newton-Raphson convergence. The default value is 1.e-7. A smaller value will lead to a smaller residual, but it will require more iterations. The convergence of force residual can be monitored in Solution Information using Force Convergence.

This option is only available with the Generalized-α, Stabilized Generalized-α, and MJ Time Stepping time integration methods.

Constraint Equation Residual Relative Tolerance

Controls the threshold for convergence of constraint equation violations in Newton-Raphson convergence. The default value is 1.e-8. The convergence of this criterion can be checked in Solution Information using Displacement Convergence.

This option is only available with Generalized-α, Stabilized Generalized-α, and MJ Time Stepping time integration.