B10 reliable-life evaluation method of mechanical part of vehicle engine

Abstract

The invention relates to a B10 reliable-life evaluation method of a mechanical part of a vehicle engine. The method comprises the following steps: selecting the mechanical part, on which B10 reliable-life evaluation needs to be carried out, of the vehicle engine; sequentially determining a mission profile of the vehicle engine corresponding to the mechanical part of the vehicle engine, a load action process parameter, a main failure mode, a stress accumulation distribution function, a probability density function of initial strength, a change rule of residual strength along with a trip distance of a vehicle and the like; and substituting each parameter into a B10 reliable-life model, and then determining B10 reliable-life of the mechanical part of the vehicle engine without the need for depending on massive life data. The B10 reliable-life of the mechanical part of the vehicle engine can be determined at a design stage of the mechanical part of the vehicle engine, design, testing and use of the mechanical part of the vehicle engine can be better guided, improvement of development and research efficiency of the vehicle engine and the mechanical part thereof is facilitated, a development and manufacturing cycle is shortened, and development and manufacturing costs are 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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