Hi,
You can use the "solve" function of the "structuralModalProperties" object to obtain modal damping ratios and modal participation factors for flexible modes. Here's an example code snippet:
% Create a structural modal properties object and find natural frequencies
structuralModal = structuralModalProperties(loadcase,modalanalysis);
structuralModalResults = solve(structuralModal);
% Specify frequency range of interest for modal damping and participation analyses
omega1 = 0;
omega2 = 1000;
% Get modal damping ratios and participation factors for flexible modes
[modalDamping,modalParticipation] = solve(structuralModal,...
"FrequencyRange",[omega1,omega2],...
"ModalAnalysisDampingMatrix","Full");
% Print modal damping ratios to the console
fprintf("Modal damping ratios:\n");
for i = 1:length(modalDamping)
fprintf("Mode %d: %.6f\n",i,modalDamping(i));
end
% Print modal participation factors to the console
fprintf("Modal participation factors:\n");
for i = 1:size(modalParticipation,2)
fprintf("Mode %d:\n",i);
for j = 1:size(modalParticipation,1)
fprintf(" DOF %d: %.6f\n",j,modalParticipation(j,i));
end
end
The "solve" function is called twice in the above code - once to get the natural frequencies and again to obtain modal damping ratios and modal participation factors for flexible modes.
