Three-dimensional calculation and optimization of the acoustic field of an induction furnace caused by electromagnetic forces

This paper presents the three-dimensional electromagnetic, structural-dynamic and acoustic calculation of electric machines with respect to induction furnaces and gives hints for optimization of complex vibrating structures. The method chosen to compute the acoustic field is the boundary element method, which solves the Helmholtz equation in the three dimensional case and considers scattering and symmetry of large scale structures. The results presented in this paper show the advantage of BEM concerning calculation time and computation resources. The aim of the work is to optimize the acoustic behavior of the structure in such a way that noise emission of the machine decreases. Several modifications are proposed and also calculated and show good results in comparison to the unmodified model.