Does the theory behind the ADAMS interface require interface nodes to have 6 DOF? In I-DEAS, they can specify which DOF are active at each interface point, thus reducing the number of constraint modes needed. So for their I-DEAS run, they have 66 constraint modes plus 50 normal modes, and the analysis takes about 8 hours. In contrast, trying to output the .mnf file in ANSYS, they have 120 constraint modes and are only requesting 10 normal modes, but after 24 hours it is only up to the 30th mode.
Part of the problem is the sparse solver is running out-of-core, but I wanted to find out if in ANSYS you can specify which DOF are active at interface points and thus reduce the total number of constraint modes that must be calculated?
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I have seen a customer-modified version of the ADAMS macro which selectively defined the master DOF for each node, so I think it is possible but it does require modifying the macro. |
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