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Computing method on overspeed damage reliability and failure rate of supercharger compressor impeller

A technology for compressors and superchargers, which is applied in calculations, instruments, and special data processing applications, etc., and can solve problems such as difficult reliability design of compressor impellers, failure rate and average life of compressor impellers, etc.

Inactive Publication Date: 2011-09-14
CHINA NORTH IND GRP NO 70 RES INST
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Problems solved by technology

Most of the existing design methods for the overspeed failure mode of the compressor impeller simply use the safety factor method for relative strength analysis and stress calculation, which can only make a simple qualitative evaluation of the reliability of the compressor impeller, and cannot comprehensively and objectively reflect the load. The influence of parameters such as the uncertainty of the environmental profile, the dispersion of the strength index, the number of blade units, and the life index on the reliability of the compressor impeller cannot calculate the failure rate and average life of the compressor impeller corresponding to the failure mode of overspeed damage. It is difficult to guide the reliability design of compressor impeller scientifically

Method used

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  • Computing method on overspeed damage reliability and failure rate of supercharger compressor impeller
  • Computing method on overspeed damage reliability and failure rate of supercharger compressor impeller
  • Computing method on overspeed damage reliability and failure rate of supercharger compressor impeller

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Embodiment Construction

[0034] A method for calculating the overspeed damage reliability and failure rate of a supercharger compressor impeller, comprising the following steps:

[0035] a. Combined with the design parameters of the compressor impeller, according to the material strength performance parameters of the compressor impeller, and considering the influence of the structural parameters and process of the compressor impeller, calculate the strength cumulative distribution function and probability density function of the turbocharger compressor impeller,

[0036] The intensity cumulative distribution function is: F C (δ)=1-[1-F i (δ)] n (1)

[0037] The probability density function is: f C (δ)=n[1-F i (δ)] n-1 f i (δ) (2)

[0038] In the formula: n represents the number of compressor impellers; such as figure 1 As shown in the figure, when the strength of the impeller blades of the compressor obeys a normal distribution with a mean value of 1000 MPa and a standard deviation of ...

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Abstract

The invention relates to a computing method on the overspeed damage reliability and failure rate of supercharger compressor impeller. Through calculating the intensity cumulative distribution function and the probability density function of the supercharger compressor impeller, calculating the cumulative distribution function and the probability density function of the equivalent load of the supercharger compressor impeller, calculating the overspeed damage reliability of the supercharger compressor impeller, calculating the overspeed damage failure rate of the supercharger compressor impeller, and calculating the overspeed damage average life of the supercharger compressor impeller, the overspeed damage reliability, failure rate and average life of the supercharger compressor impeller can be obtained according to the number of blade of the impeller and the distribution of density and load, and the failure rate data of the supercharger compressor impeller is not needed in the computing process. The method can show the influence of the uncertainty of the load environmental profile, the dispersibility of intensity index, the blade unit number, the service life index and other parameters on the reliability of the compressor impeller roundly and objectively, and calculate the overspeed damage failure rate and the average life of the compressor impeller.

Description

technical field [0001] The invention belongs to a method for calculating the overspeed damage reliability and failure rate of an impeller, in particular to a calculation method for the overspeed damage reliability and failure rate of a supercharger compressor impeller. Background technique [0002] As a key component of a supercharged diesel engine, the turbocharger plays an extremely important role in the overall performance of the diesel engine. Compressor impeller is one of the most core components of turbocharger, and its reliability largely determines the performance and reliability of the whole turbocharger. Overspeed damage is one of the most important failure modes of compressor wheels. Once the compressor impeller is damaged by overspeed, the supercharger will fail in a very short time, and the engine will not work properly. [0003] Turbochargers, especially those used for armored vehicle power, have to experience various working conditions in their entire life c...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 王正王增全谢里阳韩明红
Owner CHINA NORTH IND GRP NO 70 RES INST
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