currently I'm running an Eigen frequency analysis with cyclic symmetry. When running the model, all seems to go according to what I expected. Eigen Frequencies are in line with manufactured products for all cyclic modes. However, for cyclic modes >1 the participation factors and the modal masses become zero. I have run also the example problem from the manual "Analysis of a rotating fan using substructures and cyclic symmetry", and I see the same result; both participation factors and the modal masses become zero for cyclic modes >1. Can someone explain to me why these become zero?

Thank you in advance, regards Tim

Abaqus ​​​​​​​