Optimization Convergence

Use Optimization convergence to specify the percentage that you want to be used to determine when an optimization has converged.

In an optimization study, the optimizer adjusts the model in a series of steps until it reaches convergence in one of these ways:

• the change in the goal quantity from the previous optimization step relative to its initial value is within the convergence value

• the change in the goal quantity relative to the design variables is within the convergence value (the slope of a graph of the goal vs. the design variables is close to 0)

• the goal cannot be improved from the current design point without violating one or more of your specified limits

The convergence value is also used to determine if a limit is met. For example, if the convergence is 1%, Creo Simulate keeps to the limit value give or take 1%.

If a limit value is near zero, the optimizer uses one-tenth of the specified convergence value as an absolute limit. For example, if you use the default convergence value of 1, a zero limit is considered met if its measure has a value of 0.001 (one-tenth of 1 percent) or less.

The optimization study continues until it reaches either the convergence value or the Maximum iterations value that you specify.

You can enter any value between 0 and 100 for convergence. However, if you enter a number below 0.1 or above 25, then when you click Close, you have to confirm the value you entered at the prompt.