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Simulation Settings Window

Max. Iterations⚓︎

Specifies the maximum number of equilibrium iterations for nonlinear simulations

  • Default = 100

Convergence Check for Displacement⚓︎

Activates displacements (translational and rotational DOF) for convergence tolerance monitoring in nonlinear simulations

  • Default = on

Displacement Convergence Tolerance⚓︎

Defines the displacement convergence tolerance for nonlinear simulations

  • The infinite norm (maximum absolute row sum) of the displacement increment vector is compared with the infinite norm of the accumulated displacement vector. Convergence is achieved if the ratio of both norms is smaller than the specified tolerance.
  • Default = 0.001

Convergence Check for Force⚓︎

Activates forces for convergence tolerance monitoring in nonlinear simulations

  • The residual vector between applied forces and restoring forces will be evaluated in the implemented Newton-Raphson method.
  • Default = on

Force Convergence Tolerance⚓︎

Defines the force convergence tolerance for nonlinear simulations

  • The L2-norm (square root of the sum of the squares) of the force residual vector is compared with the L2-norm of the applied force vector. Convergence is achieved if the ratio of both norms is smaller than the specified tolerance.
  • Default = 0.001

Convergence Check for Voltage⚓︎

Activates voltages for convergence tolerance monitoring in nonlinear simulations

  • Default = on

Voltage Convergence Tolerance⚓︎

Defines the voltage convergence tolerance for nonlinear simulations

  • The same approach as used for displacements.
  • Default = 0.0001

Convergence Check for Current⚓︎

Activates currents for convergence tolerance monitoring in nonlinear simulations

  • The residual vector between external and internal current will be evaluated in the implemented Newton-Raphson method.
  • Default = on

Current Convergence Tolerance⚓︎

Defines the current convergence tolerance for nonlinear simulations

  • The same approach as used for forces.
  • Default = 0.0001

Minimum Gap for Pull-in⚓︎

Defines the minimal gap for contact elements at comb and plate capacitors

  • The gap change of comb and parallel plate capacitances is limited by contact elements.
  • Above factor specifies the remaining gap at which contact elements become effective.
  • The default value is 0.3 which is 30 % of the initial electrode gap.

Contact Normal Stiffness⚓︎

Defines the default contact stiffness factor of contact elements

  • The default contact stiffness factor is used for comb and plate capacitances, for in-plane stopper elements (see STOP command) and out-of-plane contacts (see ZLIM command).
  • The contact stiffness factors defined by STOP or ZLIM have a higher priority.
  • Default = 10 (Units of forces/units of length)

Contact Normal Damping⚓︎

Defines the default contact damping factor of contact elements

  • The default contact damping factor is used for comb and plate capacitances, for in-plane stopper elements (see STOP command) and out-of-plane contacts (see ZLIM command).
  • The contact damping factors defined by STOP or ZLIM have a higher priority.
  • Default = 10

Negative Alpha/Beta⚓︎

Allows negative alpha-beta-damping multipliers for Rayleigh-Damping

  • Negative alpha-beta-damping multipliers can occur for some settings of the RDMP command.
  • If the flag is deactivated, negative alpha and beta coefficients are set to zero.
  • Default = on

Capacitance Rounding Approximation⚓︎

Defines a capacitance rounding factor for out-of-plane motion of comb-cells

  • Capacitances of comb cells consider the quasi-homogeneous field between conductors (fringing field is ignored).
  • The capacitance-stroke-relationship for out-of-plane motion components leads to linear functions for positive and negative uz-displacements. The function is continuous but not differentiable at the initial position to improve the convergence behavior. A small rounding at the peak values has been introduced to solve the problem.
  • A capacitance rounding factor of 1 smoothens the capacitance function as shown by the orange curve. Larger values increase and smaller values decrease the rounding range independent from other dimensions.
  • > 0, default = 1

Torsion Theory (Quasi-Analytical)⚓︎