Neglecting Masses

Tips & Tricks

Since version 5.06.1103 masses of nodes, lines, members and surfaces can be neglected in RF‑DYNAM Pro. The setting to activate this feature can be found in the Details dialogue, the neglected masses are valid for all defined mass cases.

It can be useful, for example, to neglect the mass of a supported surface that participates to a large amount in the structure of the mass, but does not have a great influence in the dynamic response of the structure. When such a mass is considered it can be difficult to reach effective modal mass factors of 90%. This example is detailed in the figure.

It changes the whole dynamic analysis when masses of elements are neglected. Equivalent loads are not generated on that points for example. But also the results of time history analysis are determined with a changed mass matrix.

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