Design and Simulation of a Drivetrain Integrated Pulsation Compensator for Pumps
Sprache des Vortragstitels:
Englisch
Original Tagungtitel:
2024 ASME/BATH Symposium on Fluid Power and Motion Control (FPMC2024), September 11-13, 2024, University of Bath, UK.
Sprache des Tagungstitel:
Englisch
Original Kurzfassung:
A novel pulsation compensator for displacement machines will shortly be introduced [1,2]. The compensator is realized by a torsionally compliant coupling attached to the pump shaft, which forms a torsional oscillator together with the pump mass moment of inertia and the boundary condition determined by the remaining drivetrain. In a simplified model, the influence of the latter may be restricted to the driving motor?s mass moment of inertia. Under stationary conditions and in the absence of damping, free torsional oscillations of the pump rotor are supposed to compensate for pump induced flow rate pulsations at constant pressure in the hydraulic system.
In this paper, design requirements for the compensator coupling are formulated and applied in a particular case. Clearly, the natural frequency of the pump drivetrain must match the pump harmonic to be compensated. Furthermore, the coupling must withstand static and dynamic loads originating from maximum pressure and maximum torsional deflection, respectively. Finally, the size of the coupling must fit the dimensions of the drivetrain with essential restrictions on coupling diameter.
For the selected application, a coupled hydraulic-mechanical model is set up and time domain simulations are carried out. The origin of pump induced flow rate pulsations is included in the model, which also accounts for damping and an exemplary hydraulic circuit at the pump outlet. Beyond the investigation of stationary pressure pulsations, the effect of side resonances during startup is studied. The simulation is used to plan the experimental procedure for the practical proof of the novel compensator.
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