Device for reducing hydraulic-fluid oscillation in a hydraulic system
View Patent ↗A device for reducing hydraulic-fluid oscillation in a hydraulic system, in particular in a hydraulic system of an aircraft, wherein the hydraulic system comprises a pump that is driven by a drive, which pump conveys a fluid to a hydraulic line by pressure pulsation. The device comprises an actuator, arranged in the hydraulic line for generating pressure pulsation that compensates for the pressure pulsation of the pump.
1. A device for reducing hydraulic-fluid oscillation in an engine pump of an aircraft engine, which engine pump operates at audible frequencies, which engine pump conveys a fluid to a single hydraulic line by pressure pulsations, the device comprising:
an actuator, arranged in the single hydraulic line for generating pressure pulsations that compensate for the pressure pulsations of the engine pump;
a control device for controlling the actuator as a function of the pressure pulsations occurring in the single hydraulic line; and
a sensor in the single hydraulic line for registering the occurring pressure pulsations and configured for providing a respective output signal to the control device,
wherein the sensor is arranged in the single hydraulic line so as to be upstream of the actuator at a distance of less than or equal to λ/6 from the actuator, wherein λ is a predetermined characteristic wavelength of a predetermined hydraulic oscillation to be reduced in the single hydraulic line.
2. The device of claim 1 , wherein the sensor is arranged in the single hydraulic line so as to be in close proximity to an outlet of the engine pump.
3. The device of claim 1 , wherein the control device is configured to control the actuator to minimize the pressure pulsations registered by the sensor.
4. The device of claim 1 , wherein the engine pump is an axial piston pump.
5. The device of claim 1 , wherein the actuator is driven electrically.
6. The device of claim 1 , wherein the actuator is driven hydraulically or pneumatically.
7. The device of claim 1 , wherein the control device is configured to control the actuator to generate pressure pulsations according to a frequency and an amplitude such that the total pressure pulsations of the engine pump and of the actuator are kept to a minimum.
8. The device of claim 1 , wherein the control device operates electronically.
9. The device of claim 1 , wherein the device is arranged in an engine pylon of an aircraft.
10. The device of claim 1 , wherein said engine pump continuously conveys said fluid.
11. A method for reducing hydraulic-fluid oscillation in an engine pump of an aircraft, comprising:
providing an engine pump which operates at audible frequencies;
conveying a fluid by the engine pump to a single hydraulic line by pressure pulsations;
generating pressure pulsations by an actuator arranged in the single hydraulic line that compensates for the pressure pulsations of the engine pump;
controlling the actuator as a function of the pressure pulsations occurring in the single hydraulic line by a controller;
registering the occurring pressure pulsations by a sensor in the single hydraulic line; and
providing a respective output signal to the controller;
wherein the sensor is arranged in the single hydraulic line so as to be upstream of the actuator at a distance of less than or equal to λ/6 from the actuator, wherein λ is a predetermined characteristic wavelength of a predetermined hydraulic oscillation to be reduced in the single hydraulic line.
12. The method of claim 11 , wherein the actuator, the sensor, and the controller are arranged in an engine pylon of the aircraft.
13. The method of claim 11 , wherein the step of conveying is continuous.