Measurement of a rotary mechanical pulsation compensator under hydraulic resonance

Description

If the pulsation frequency of a hydraulic pump or motor coincides with a natural fre-
quency of the hydraulic system, there is a particular need for pulsation compensation.
Under these conditions, a rotary mechanical pulsation compensator is investigated.
The compensator consists in a torsional oscillator which is formed by the drivetrain of
a radial piston pump and requires a special compensator coupling. At the pump outlet, two different hydraulic layouts are considered, including a closed pipeline and a cylinder chamber connected via a hose. Prior to experiments, simulations are conducted to determine system parameters at which a natural frequency of the hydraulic system matches the compensation frequency. In the experimental setup, the compensator coupling is installed on the pump shaft and driven by a speed-controlled induction motor. The measurements conducted with a closed pipeline show a pulsation reduction by a factor of more than three in the resonance case during a run-up test. Similar results are obtained in a run-up test with a cylinder in its limit stop position. An extension test with constant motor speed shows significant reduction of pressure pulsation.
In the present configuration, the compensation effect is narrowband and the design
of the coupling causes a dependency between compensation frequency and drivetrain
torque.

Period	02 Jun 2025
Event title	The 19th Scandinavian International Conference on Fluid Power, SICFP'25
Event type	Conference
Location	Linköping, SwedenShow on map
Degree of Recognition	International