Detuning device and method

A detuning ring for detuning a structural resonance in a pump assembly, the pump assembly including a drive unit and a hydraulic unit, the detuning ring comprising:

• a first axial face;
• and
• a second axial face,
• the first axial face including a plurality of first lands and a plurality of first grooves, each first land of the plurality of first lands extending in a radial direction and comprising a planar first top face, and each first groove of the plurality of first grooves delimited by two adjacent first lands of the plurality of first lands and the first axial face,
• the second axial face including a plurality of second lands and a plurality of second grooves, each second land of the plurality of second lands extending in the radial direction and comprising a planar second top face, each second groove of the plurality of second grooves delimited by two adjacent second lands of the plurality of second lands and the second axial face,
• the detuning ring is a single structural element that includes the first axial face and the second axial face and is configured to be arranged between the drive unit and the hydraulic unit, and to be fixed relative to the drive unit or the hydraulic unit.