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217 ©2023 ANSYS, Inc. Forced Response Add-on: Mistuning and Aero coupling loads inserted to Cyclic Mode Superposition Harmonic system Mistuning on Cyclically Symmetric Structures Small mistuning effects (on the order of a few percent) may be included in the analysis by introducing blade- to-blade variations in the stiffness (frequency) of each blade. Aerocoupling on Cyclically Symmetric Structures Aerodynamic coupling effects can be included in the Forced Response analysis. Aerodynamic coefficients account for vibration-induced pressure fluctuations on the blade surface, and contribute to the stiffness and damping of the system.