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Disturbing vibrations and noise of electrical machines are gaining impact. Therefore, it is necessary to estimate the electromagnetic, structure-dynamical, 70-400 and acoustic behavior of the machine during designing and before prototyping. An adequate tool is numerical 70-401 simulation applying the Finite-Element Method (FEM) and the Boundary-Element Method (BEM) allowing for the structured analysis and evaluation of audible noise also caused by manufacturing tolerances. 70-403 The methods developed and proved at the Institute of Electrical Machines (IEM) at RWTH Aachen 70-404 University can be applied to any electromagnetic device in general.