Method for evaluating B10 reliable life of mechanical part of vehicle engine

Abstract

The invention relates to a method for evaluating the B10 reliable life of a mechanical part of a vehicle engine. The method comprises the following steps: selecting a mechanical part, which is subjected to B10 reliable life evaluation, of the vehicle engine; sequentially determining a mission profile of the vehicle engine corresponding to the mechanical part of vehicle engine, a load action process parameter, a main failure mode, a stress cumulative distribution function, a probability density function of initial strength, a change rule of residual strength along with the trip distance of a vehicle and the like; and substituting the parameters into a B10 reliable life model so as to determine the B10 reliable life of the mechanical part of the vehicle engine without depending on a great number of life data. By the method, the B10 reliable life of the mechanical part of the vehicle engine can be determined at the design stage of the mechanical part of the vehicle engine, design, test and use of the mechanical part of the vehicle engine can be guided well, the development and research efficiency of the vehicle engine and the mechanical part thereof can be improved, the development period is shortened, and the development cost is saved.

Description

technical field [0001] The invention belongs to a reliability evaluation and life prediction method of a vehicle engine, in particular to a B10 reliable life assessment method of mechanical parts of a vehicle engine. Background technique [0002] B10 reliable life refers to the corresponding life when the reliability is greater than 0.9, which is one of the most commonly used reliability metrics for automotive engines and their mechanical parts. Due to the influence of uncertain factors such as the randomness of the working profile, the instability of the manufacturing process, and the dispersion of material properties, the actual service life of the vehicle engine and its mechanical parts has obvious characteristics of uncertainty. In order to accurately describe the life characteristics of automotive engines and their mechanical parts, foreign developed countries generally use "reliable life", a life index that can reflect uncertain characteristics, to describe the reliabi...

AI Technical Summary

Problems solved by technology

Due to the characteristics of "high reliability and long life" of automotive engine mechanical parts, it is difficult to obtain sufficient life data through a large number of life tests in the development stage like electronic components. Therefore, although the life data statistics method is theoretically applicable For the life evaluation of automotive engine mechanical parts, but it is impossible to evaluate the B10 reliable life of automotive engine mechanical parts in a timely and effective manner at the design stage, and it is difficult to effectively guide the design of automotive engine mechanical parts

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