Hydraulic Power Source Dynamics when Operating in Vicinity of a Support Limiting the Pump Feed

Abstract

The paper presents results of studying dynamic characteristics of a hydraulic power source based on the positive displacement pumps. The feed control mechanism of such pumps contains supports that limit the piston displacement in a regulator hydraulic cylinder. The paper shows that taking into account the displacement restrictions and using nonlinear function of the "saturation" type does not allow an adequate description of the system dynamics. It considers the cases of taking into account the symmetrical and one-sided supports in the control mechanism with a harmonic input signal. Harmonic linearization coefficients are obtained for these cases. The case of a one-sided support corresponds to the hydraulic power source operation in vicinity of the zero feed, and is characterized by a constant shift in the spool coordinate to the negative values region. The analysis con-ducted shows that the output signal is subjected not only to the amplitude distortions, but also to the phase distortions, which is not providing the "saturation" type link. The amplitude-frequency characteristics of a hydraulic power source are constructed when operating under the forced oscillations conditions caused by a disturbing harmonic alteration in the consumed flow rate. The analysis reveals that supports are reducing the resonant pressure peaks behind the pump the more, the higher is the oscillation index of the linear system. The paper shows that peculiarity of the asymmetric oscillations during pump operation in vicinity of the zero flow lies in the presence of not only a periodic, but also of a constant component. The sequence of constructing the amplitude-frequency characteristics for this case is provided. The paper presents the amplitude-frequency characteristics of a hydraulic power source with the one-sided supports, and compares them with results of the conducted experimental studies

Please cite this article in English as:

Fedenkov V.V., Cherkasskikh S.N., Sheykin M.O., et al. Hydraulic power source dynamics when operating in vicinity of a support limiting the pump feed. Herald of the Bauman Moscow State Technical University, Series Mechanical Engineering, 2025, no. 3 (154), pp. 93--111 (in Russ.). EDN: QKGSNW

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