Fatigue life calculation method for engine parts based on road cycle working condition

A technology of fatigue life and cycle working conditions, applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc., can solve the problem that the fatigue life of engine parts cannot be effectively and uniformly calculated, and achieve the effect of speeding up work efficiency

Inactive Publication Date: 2013-01-02
湖南奔腾动力科技有限公司
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Problems solved by technology

[0003] The invention proposes a method for calculating the fatigue life of engine parts based on road cycle conditions, which solves the probl

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  • Fatigue life calculation method for engine parts based on road cycle working condition
  • Fatigue life calculation method for engine parts based on road cycle working condition
  • Fatigue life calculation method for engine parts based on road cycle working condition

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with accompanying drawing:

[0023] Such as figure 1 Shown is the flow chart of the present invention, taking the piston as an example of a high-temperature part, using the present invention to calculate its fatigue life, including the road cycle life of the whole vehicle and the bench test life.

[0024] Such as figure 2 Shown is the European road cycle conditions, it can be obtained that the cycle time per cycle in the European road cycle conditions is 1180 seconds, and the mileage per cycle is 11.01Km.

[0025] Calculate engine operating conditions according to road conditions, including speed n, engine mean effective pressure P e and engine effective power P me ;

[0026] Calculate the engine speed corresponding to each moment when the car is running on the road as Among them, n is the engine speed (r / min), u is the vehicle speed (m / s), i 0 main reduction ratio, i g is the gear ratio of th...

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Abstract

The invention discloses a fatigue life calculation method for engine parts based on a road cycle working condition, comprising the steps of obtaining the fatigue life corresponding to a single cycle damage value via a step of calculating the single cycle damage value, obtaining a cycle kilometre via a step of calculating the cycle kilometre, and multiplying the fatigue life corresponding to a total single cycle damage value by the cycle kilometre to obtain the fatigue life of the parts based on the road working condition; a wide gap between a test working condition and an actual road working condition is broken through by virtue of the single cycle damage value, and the problem of calculation on the fatigue life of the high-temperature parts of an engine is solved from the deepest level; and via the method, the running mileage of a whole car carrying the parts can be directly evaluated, the design requirements of products are defined, and the working efficiency of product designers is increased.

Description

technical field [0001] The invention relates to a method for calculating fatigue life of engine parts based on road cycle working conditions. Background technique [0002] For the fatigue life calculation of engine high-temperature parts (pistons, exhaust manifolds, cylinder heads, etc.), generally the low-cycle fatigue calculation method is the main method, that is, to simulate the engine bench test conditions (thermal shock test for high-temperature engine parts), Calculate the temperature history and stress / strain history of a part under the national standard (or enterprise standard) working conditions, then calculate the single-cycle damage value according to the fatigue damage principle and material properties, and finally calculate the fatigue life according to the single-cycle period. However, this method can only evaluate the bench life (test life) of the engine, and cannot be applied to the road cycle conditions of the whole vehicle, that is, it cannot evaluate the ...

Claims

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Application Information

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IPC IPC(8): G01M13/00
Inventor 邓帮林徐政欣赵智超王毅
Owner 湖南奔腾动力科技有限公司
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