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Journal of Engineering and Applied Sciences

Year: 2016  |  Volume: 11  |  Issue: 2  |  Page No.: 204 - 209

Reliability Estimation of Machine Parts with Complicated Geometry on a Base of Methods of Nonparametric Statistics

V. Syzrantsev and K. Syzrantseva

Abstract

The study considers the durability estimation task of details with complicated geometrical shape working in random regime at operation. The analytical dependences for stress-strain condition calculation of machines part and units do not exist, therefore estimation of the stresses and displacements of such objects is possible to carry out only by computer simulation with the help of numerical methods: Finish Element Method (FEM). External loads to details (pressure and temperature) are random values and generally aren’t described by known laws of distribution. Researchers have developed the original algorithm for estimation of probability of no-failure operation of details based on use of the apparatus of nonparametric statistics. Adjustment of nonparametric generators of random numbers is realized by methods of nonparametric statistics in accordance with real samples of pressure and temperature. As a result of realization of multiple-factor, computer experiment for calculation the stress-strain condition of detail under random loading the functions approximating the stress variation in dangerous points depending on the loads level are determined. On the basis of these functions, the estimation of probability of no-failure operation in all dangerous points of a detail is carried out. The algorithm developed by researchers is shown on the example of durability estimation (probability of no-failure operation) of the body of wedge valve KZ13010-100.

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