Implementation of control elements in FEM calculations of machine tools

In structural dynamic calculations of machine tools, coupled systems play a decisive role. The article shows the implementation of additional differential equations, representing the control, in a FEM environment on the example of ANSYS. Therefore, the existing cascade control, which is typical in machine tool feed axes, can be considered directly in the FEM environment. By merging into a macro, an element which is particularly easy to handle is created. The applications in analyses in the time- and frequency range are discussed in a couple of examples.