Vibration suppression of turbine blade

A vibration suppression method in a turbine body, comprising:

• rotating a turbine rotor of the turbine body around an axis of rotation, wherein the turbine body includes an inner housing surface including one or more grooves, and wherein the inner housing surface extends in an axial direction of the turbine rotor;
• applying a first excitation force to a rotating blade of the turbine rotor in response to a rotation of the turbine rotor, wherein each of the one or more grooves extends substantially in a radial direction of the axis of rotation, and further extends longitudinally at a non-zero angle with respect to the axial direction of the turbine rotor, wherein the non-zero angle substantially matches a pitch angle of the rotating blade, and wherein the one or more grooves intermittently face the rotating blade during the rotation of the turbine rotor;
• and
• generating a second excitation force in response to the rotating blade passing by the one or more grooves, wherein the second excitation force has a phase that is different from a phase of the first excitation force to suppress a resonant state of the rotating blade.