Stabilizing run diagnostics

Stabilizing run diagnostics

In the current example the stabilizing run works very well. However, sometimes it fails. In this case Simcenter Amesim can be persuaded to display some diagnostics. To enable these select the Standard options tab in the Run Parameters dialog box and tick the Diagnostics check box in the Stabilizing run options area.

As the stabilizing run starts, an analysis made of the structure of the Jacobian corresponding to the equations being solved. The Jacobian is a matrix of size corresponding to number of state variables N in the system. The rank of this Jacobian is calculated and if it is less than N, messages are displayed. The following are displayed using a modified version of the Quarter car system.

Figure 64: Rank of Jacobian less than N

Note that there are references to locked variables. These are described in the next section.