Accelerated Life Test Model for Life Prediction of Piston Assemblies in Hydraulic Pump and Motor


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The safety factor of hydraulic piston pumps and motors shows a tendency to decrease due to high pressurization, high speed and low weight/volume realization to enhance the output density. Therefore, more effective test models are necessary to predict the exact life. The sensitive parameters in the endurance life test are speed, pressure and temperature, and failure production increases in proportion to the operating time. In this research, the authors propose a combined accelerated life test model using the analysis method of the combined accelerated life test results of piston-shoe assemblies by simultaneously applying high speed, high pressure and high temperature in accordance with the variation in speed, pressure and temperature in order to reduce the life test time.



Key Engineering Materials (Volumes 326-328)

Edited by:

Soon-Bok Lee and Yun-Jae Kim




Y.B. Lee et al., "Accelerated Life Test Model for Life Prediction of Piston Assemblies in Hydraulic Pump and Motor", Key Engineering Materials, Vols. 326-328, pp. 649-652, 2006

Online since:

December 2006




[1] J. Ivantysyn and M. Ivantysynova, Hydrostatic Pumps and Motors, First English Edition, p.210~390, (2000).

[2] M. Ivantysynova, Accelerated Life Test General Approach for Hydrostatic Units, p.5~25, (2003).

[3] W. Weibull, Statistical Distribution Function of Wide Applicability, ASME Journal of Applied Mechanics, Vol. 18, p.293~297, (1951).

[4] G. S. Wasserman, Reliability Verification, Testing and analysis in Engineering Design Handbook, Marcel Dekker, Inc. p.25~377, (2003).

[5] MIL-STD 721C, Definitions of Terms for Reliability and Maintainability, p.2~13, (1966).

[6] V. R. Lalli and H. A. Malec, Reliability Training, NASA Reference Publication 1253, p.105~126, (1992).

[7] ReliaSoft, Accelerated Life Testing Reference, ALTA Version 6, p.5~295, (2001).