Device and method for actively reducing pressure variations in a hydrodynamic system

A device for active reduction of pressure fluctuations in a hydrodynamic system comprising:

• a pump,
• a pressure fluctuation generator,
• at least one pressure sensor
• and a controller unit, wherein the controller unit is adapted to control the pressure fluctuation generator and receive a pressure fluctuation signal from the pressure sensor, wherein
• the rotational speed of the pump can be captured and is receivable by the controller unit, wherein the controller unit is adapted to
• to generate a reference signal from the rotational speed of the pump,
• generate a control signal from the reference signal by means of an adaptive filter, and to control the pressure fluctuation generator with the control signal, wherein
• the controller unit is adapted to continuously optimize the adaptive filter to minimize the pressure fluctuation signal.

A pressure fluctuation generator for generating pressure fluctuations in a hydrodynamic system, comprising:

• an oscillator and an actuator, wherein
• the oscillator comprises a source area facing a pressure compartment of the hydrodynamic system and to which a static pressure of the hydrodynamic system is applied, wherein
• the oscillator is connected to the actuator, wherein the actuator is adapted to oscillate the source area by means of a control signal to apply pressure fluctuations to the hydrodynamic system, wherein
• the pressure fluctuation generator comprises a back pressure chamber separated from the pressure compartment of the hydrodynamic system and from the ambient pressure,
• and the oscillator faces the back pressure chamber at backside of the source area,
• wherein the back pressure chamber is gas-filled and a back pressure is present in the back pressure chamber which is matched to the static pressure in the pressure compartment.