Method for evaluating reliability life of cylinder head

An evaluation method and cylinder head technology, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve the problems of complex cylinder head geometry, large cylinder head failure forms with large dispersion of casting performance, etc., to ensure reliable use. sexual effect

Active Publication Date: 2018-05-04
CHINA NORTH ENGINE INST TIANJIN
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AI Technical Summary

Problems solved by technology

In fact, the operation of a vehicle engine is usually composed of a variety of working conditions, the working state parameters of the cylinder head are also constantly changing,

Method used

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  • Method for evaluating reliability life of cylinder head
  • Method for evaluating reliability life of cylinder head
  • Method for evaluating reliability life of cylinder head

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Embodiment Construction

[0050] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0051] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0052] A method for evaluating the reliability life of a cylinder head of a vehicle engine, comprising the following steps:

[0053] a. According to the purpose and actual use of the engine, determine the task profile of the engine, and define the running time and state parameters of the engine under different working conditions.

[0054] For example, in the trial production research stage of an engine, the durability bench test is used as a task profile: the cycle time of the bench durability assessment test is 10 hours, and the key consideration for the cylinder head life estimation is 100% of the calibrated speed for 1 hour , 85% to 90% of the calibrated speed for 7 hours, 80% of the c...

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Abstract

The invention provides a method for evaluating the reliability life of a cylinder head. The method includes: selecting the mission profile of an engine according to the purpose and service conditionsof the engine, and defining the operation time and working state parameters of the engine under different working conditions; in the indenture level of the engine and the cylinder head, determining the main failure mode of the cylinder head; performing deterministic analysis on the cylinder head to determine the weak part of the cylinder head structure; performing dispersity analysis on the material performance of the cylinder head to determine the ultimate strength distribution of the cylinder head; determining the loading condition and dispersity of the cylinder head under the selected working condition, and analyzing the stress distribution of the dangerous part of the cylinder head under the corresponding working condition; performing structural reliability analysis on the cylinder head; determining the probability distribution features of the fatigue life of the cylinder head and the reliability life, satisfying different reliability requirements, of the cylinder head. By the method, the reliability life of the cylinder head can be evaluated in the development stage of the engine, and the structural design and reasonable utilization of the cylinder head can be well guided.

Description

technical field [0001] The invention belongs to the technical field of engine performance evaluation, and in particular relates to a reliability life evaluation method of a cylinder head. Background technique [0002] The cylinder head is one of the core components of the engine. With the increase of the power density of the vehicle engine, its reliability directly affects the reliability and service life of the entire engine. The existing methods for evaluating the cylinder head of a vehicle engine are mainly through finite element analysis and fatigue simulation analysis, both of which are deterministic analysis. In fact, the operation of a vehicle engine is usually composed of a variety of working conditions, and the working state parameters of the cylinder head are also constantly changing. The geometric structure of the cylinder head is complex, and the dispersion of casting performance is large, which leads to the dispersion of the failure form of the cylinder head. T...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F2119/04G06F30/23G06F30/17G06F2119/06
Inventor 葛玉霞王增全吴波杨聪天许明胜刘海瑞邓雅冲
Owner CHINA NORTH ENGINE INST TIANJIN
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