Hi I am using Ansys to find the natural frequency of a structure but this has meant that my understanding of vibrations has become unstuck. When I last studied natural frequencies, it was under free vibration. I formed the impression that one structure can have only one natural frequency which would correspond with a mode shape. However, in Ansys, for a continous structure, you can find an infinite number of mode shapes (default of 6). So my question is, how can a structure have so many natural frequencies and therefore corresponding mode shapes. Confused me! Any help much appreciated!