Experimental analysis of frictional power loss of hydrostatic slipper bearings

Abstract

Purpose -The purpose of this paper is to investigate experimentally slippers, which have an important role on power dissipation in the swash plate axial piston pumps. Since slippers affect the performance of the system considerably, the effects of surface roughness on lubrication have been studied in slippers with varying hydrostatic bearing areas and surface roughness. Design/methodology/approach -An experimental set-up was designed to determine the performance of slippers, which are capable of increasing the efficiency of axial piston pumps, in different conditions. Findings -The findings suggest that the frictional power loss has been caused by surface roughness, capillary tube diameter, and the size of the hydrostatic bearing area, supply pressure and the relative velocity. In the case of the 0.7 and 9.5 mm surface roughness more power is needed to overcome the friction force between slippers and slipper plates, but less power loss occurs with the slippers with surface roughness of 1.5 mm. The slippers with surface roughness of 1.5 mm are considered, because of the optimum power loss. Moreover, the power loss decreases with increasing capillary tube diameter and supply pressure. Originality/value -In order to investigate slipper behaviour under different operating conditions, with different capillary tube size and supply pressure an experimental work was carried out for finding exact design parameters of the real time system.

Prediction of Slipper Pressure Distribution and Leakage Behaviour in Axial Piston Pumps Using ANN and MGGP

“…In the ANN model, however, two layers were used. The neuron numbers in the hidden layers (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) and the activation functions in (3)-(5) were tried, in all combinations. The model with the lowest MSE (2.6558e-05) had 16 and 13 neurons in the first and second hidden layers, respectively, and incorporated the tansig activation function.…”

“…Thus, the thickness of the oil film between the slipper and swash plate adjusts, and the generated compressive force remains in constant balance. As apparent from Figure 1 which is caused by the supply pressure ( ) and acts on the slipper, is balanced by the pressure between the slipper bearing surface and the anticoincident elements [7]. The PD on land under these circumstances can be explained through solution of the Reynolds equation in cylindrical coordinates for flat slipper including average oil film thickness [2]:…”

“…In an experimental study, Canbulut et al [7] investigated the power loss in APPs and the effect of surface roughness on the slipper. They designed an experiment setup to 2 Mathematical Problems in Engineering determine the slipper performance under different operational conditions.…”

Efficiency determination of amplitude decay of pressure fluctuation of circulating fluid with the help of a multi-stage piston-type downhole compensator

“…The operating principle of strain transducers lies in changing the electrical resistance of conductors fixed on the elastic member (membrane) depending on their deformation caused by the process pressure [14].…”

Experimental Research on the Dynamic Lubricating Performance of Slipper/Swash Plate Interface in Axial Piston Pumps

“…Only by the test in real condition to verify the accuracy of the theoretical models, can the study on its lubricating performance truly progress. The experimental study on the slipper/swashplate interface also experiences the evolution from static to dynamic [17], from steady to unsteady [18], from indirect to direct measurement [19], from model test to real pump test [20,21]. Chao et al [3] presented a review of the test rigs of the slipper bearing in axial piston pump.…”