scispace - formally typeset
Search or ask a question
Journal ArticleDOI

Piston eccentricity and friction force measurement in a hydraulic cylinder in dynamic conditions considering the form deviations on a piston

TL;DR: In this article, a test rig is designed and fabricated to measure the piston eccentricity and friction in a dynamic condition, and cylinders of defined geometric profiles such as elliptic and three-lobe are fabricated using a machining center.
About: This article is published in Mechatronics.The article was published on 2001-04-01. It has received 13 citations till now. The article focuses on the topics: Piston & Radial piston pump.
Citations
More filters
Journal ArticleDOI
TL;DR: A finite volume based Reynolds equation model has been formulated for the piston-cylinder clearance which considers the piston eccentricity and the relative tangential movement between piston and barrel as mentioned in this paper, and different grooves configurations have been evaluated in search of finding minimum leakage, minimum appearance of cavitation and maximum restoring torque.

60 citations


Cites background from "Piston eccentricity and friction fo..."

  • ...[2] examined experimentally the pressure distribution in the clearance piston–cylinder and concluded that the eccentricity of the piston affected the performance of the piston by influencing the frictional and leakage aspects....

    [...]

Journal ArticleDOI
TL;DR: In this paper, a non-Lipschitz friction force compensator based on periodic adaptive learning control (PALC) is proposed for the compensation of a state-dependent external disturbance of electromechanical systems.

16 citations


Cites background from "Piston eccentricity and friction fo..."

  • ...It is supposed that the non-Lipschitz discontinuity arises at zero velocity as commonly observed in electromechanical systems [20]....

    [...]

Journal ArticleDOI
TL;DR: In this paper, a 3D surface modelling approach is presented using random process modelling as the basis to model the grinding and honing processes which are commonly employed for the manufacture of the hydraulic assemblies.
Abstract: Friction in servo hydraulic assemblies reduces the response characteristics of the system. The friction is influenced by various factors including the geometry (form and surface errors) of the sliding surfaces. In this work, functionally significant 3D surface parameters from the Birmingham parameters are investigated for reduced friction. A 3D surface modelling approach is presented using random process modelling as the basis. An exponential decay areal autocorrelation function is used to model the grinding and honing processes which are commonly employed for the manufacture of the hydraulic assemblies. Honed surface is modelled with the crosshatches of appropriate angle. Method of surface modelling is validated using the data obtained through measurements on a practical surface. Different surface maps with varying surface parameters of the ground and honed surfaces are generated. The fluid continuum gap geometries of the hydraulic assemblies are modelled using these surface maps as envelopes. Pressure distribution, velocity and viscous friction force are used as measurands of the frictional characteristics. Using computational fluid dynamics (CFD) approach, these measurands are evaluated for different functionally significant Birmingham parameters. Based on further analysis, negative skewness, lower kurtosis values, higher valley fluid retention index were found to have lower frictional characteristics.

14 citations

Journal ArticleDOI
TL;DR: In this article, the authors discuss the approach of isogeometric analysis (IGA) for solving the Reynolds equation in lubricated piston dynamics and show that the efficiency is improved remarkably than the traditional Finite Element Method (FEM) when the IGA approach is adopted.

13 citations

Journal ArticleDOI
TL;DR: In this article, the effect of grooves cut on the piston surface, the number of the grooves and their location over the piston surfaces on the volumetric efficiency of the hydraulic radial piston pumps was investigated.
Abstract: A radial piston pump often used in high pressure applications. The geometry of the pistons used affects the mechanical and volumetric efficiency of the pump and its long term performance. In the present study, the effect of grooves cut on the piston surface, the number of the grooves and their location over the piston surface on the volumetric efficiency of the hydraulic radial piston pumps was investigated. In order to perform the research tests, the three-piston fixed displacement pump with seven configurations was firstly designed and fabricated. The output flow rate of the pump was determined at pressure outlets of 350 and 500 bar and then the volumetric efficiency was calculated as the mean values of measured data. The results showed that the grooves cut on the piston surface produces a higher piston–cylinder overall leakage and then tend to reduce the volumetric efficiency. Also as the number of grooves being cut on piston surface increases, an increase in leakage will happen. In addition, b...

11 citations


Cites methods from "Piston eccentricity and friction fo..."

  • ...The pressure distribution in the clearance piston–cylinder was experimentally inspected by Sadashivappa et al. (2001)....

    [...]

References
More filters
Journal ArticleDOI
TL;DR: In this paper, an experimental method of determining sliding friction forces in a pneumatic actuator is described, and several empirical and semi-empirical friction models are evaluated using measured friction force data.
Abstract: This paper describes an experimental method of determining sliding friction forces in a pneumatic actuator. Several empirical and semi-empirical friction models are evaluated using measured friction force data. A repeatability study is also performed to qualitatively assess friction randomness and a change in friction regimes.

30 citations

Journal ArticleDOI
01 May 1990-Wear
TL;DR: In this article, an attempt is made to analyse systematically the three types of profiles commonly considered for high speed actuators, using Reynolds' differential equation, and analyses are made using an analytical method for one-dimensional flow and using the finite element method for twodimensional flow.

17 citations

Journal ArticleDOI
TL;DR: In this article, the effect of machining imperfections like out-of-roundness and taper in the piston on the mechanical and volumetric efficiency of the motor, in the speed range where the viscous friction is dominant, is studied.

16 citations

Journal ArticleDOI
01 Jul 1994-Wear
TL;DR: In this paper, a new test-rig has been developed to test the actuators, and the test results confirm the main findings of the theoretical study on three types of tapered pistons.

15 citations