(a), the source flow ripple is implicitly assumed to be generated at the pump exit. However, this is not the case for a real pump in which the actual source flow ripple is created at the inner end of the discharge passageway as shown in fig.3 (b). There are a few approaches to correlate the measured source flow ripple Qs and source impedance Zs ...
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WhatsApp: +86 18221755073The pump under consideration is an aviation axial-piston swash-plate type with damping holes in the valve plate as shown in Fig. 1.The pump has nine pistons (Z = 9).It is assumed that the pump operation begins when one piston is at the zero reference line (ZRL), as shown in Fig. 1.This position of the piston is called the 'top dead center' (TDC) where …
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WhatsApp: +86 18221755073Positive displacement machines present a well-known major drawback that is the oscillation in delivered flow rate. This paper presents two active solutions for reducing the flow ripple generated by a pump with an external device actuated by means of a piezo-stack actuator. The work is focused on a theoretical analysis, with the aim of collecting information …
WhatsApp: +86 18221755073After optimization, the ripple in the outlet flow rate is, respectively, reduced by 37.05 %, 38.54 % and 41.04 % for outlet pressures of 200 bar, 300 bar and 400 bar. Finally, a flow ripple test experiment is performed to verify the simula-tion results. Keywords: Piston pump; Flow ripple; Parametric design; AMESIM; ISIGHT
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WhatsApp: +86 18221755073Simulation has proved to be a useful tool for optimization of the portplate geometry and for developing new methods to reduce pump flow ripple. Different conventional methods are compared with unconventional ones. A new method which gives very low flow ripple over a large operating range is included in this study.
WhatsApp: +86 18221755073This paper represents the results obtained with a preliminary numerical methodology adopted to reduce noise in axial piston pumps. Starting from a preliminary design (further called "Valve plate #1"), two different valve plates have been proposed comparing their contribution to reduction of flow ripple. The pump is an open circuit axial piston pump, …
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WhatsApp: +86 18221755073College of Mechanical Engineering, Xinjiang University, 830047, Urumqi, China b efang3500@sina. Received: 25 November 2021 Accepted: 26 January 2022 Published online: 7 February 2022 Abstract. The Smoothed Particle Hydrodynamics (SPH) method is used to numerically simulate the unsteady sand ripple wind-sand flow movement in a …
WhatsApp: +86 18221755073This paper presents a flow ripple model for external helical gear pumps. The model is for pumps with and without intermesh side play. Moreover, selected aspects of the evaluation of the acoustic properties of prototype low-noise gear pumps developed in collaboration with the firm PHS HYDROTOR S.A. are described. The acoustic characteristics of the …
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WhatsApp: +86 18221755073This paper investigates the potential of flow ripple reduction of an axial piston pump by a combination of cross-angle and pressure relief grooves. A dynamic model is developed to analyze the pumping dynamics of the pump and validated by experimental results. The effects of cross-angle on the flow ripples in the outlet and inlet ports, and the piston …
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WhatsApp: +86 18221755073than the kinematic flow ripple. This is normally true even at low outlet pressures. 3.0] n Total flow ripple c' 2.5- ECU Kinematic flow ripple ' I20" ļļ n I15' I líl n I 1.0- n W p p. I - 0.0 1.0 2.0 3.0 4.0 Frequency [kHz] Figure 3 Pump source flow ripple (white bars) and the kinematic part (shaded bars). The magnitude of the flow ripple is ...
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