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增壓器渦輪葉輪極端載荷下動(dòng)態(tài)可靠性模型
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國(guó)家自然科學(xué)基金資助項(xiàng)目（50905007）、國(guó)防科技重點(diǎn)實(shí)驗(yàn)室基金資助項(xiàng)目(9140C3306131001)和中國(guó)博士后科學(xué)基金特別資助項(xiàng)目（200902042）


Dynamic Reliability Model of Turbine Impeller of Turbocharger under Ultimate Load
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    摘要:

    分析了葉片單元數(shù)與載荷作用次數(shù)對(duì)渦輪葉輪可靠性的影響，建立了極端載荷作用下增壓器渦輪葉輪的動(dòng)態(tài)可靠性模型與失效率計(jì)算模型。分析了渦輪葉輪的結(jié)構(gòu)特點(diǎn)，建立了能體現(xiàn)葉片數(shù)影響的渦輪葉輪強(qiáng)度概率分布函數(shù)。針對(duì)增壓器渦輪葉輪由超速這種極端載荷所引起的失效模式，以載荷作用次數(shù)為壽命度量指標(biāo)，建立了能體現(xiàn)葉片單元數(shù)、載荷、強(qiáng)度以及工作循環(huán)次數(shù)影響的渦輪葉輪可靠性模型、失效率計(jì)算模型以及平均壽命模型。以某型增壓器為例，研究了渦輪葉輪可靠度與失效率隨工作循環(huán)次數(shù)的變化規(guī)律。研究表明：隨著工作循環(huán)次數(shù)的增加，渦輪葉輪的可靠度逐漸降低，失效率逐漸減小且趨于一個(gè)穩(wěn)定值。與傳統(tǒng)方法相比，所建模型可以更加準(zhǔn)確地對(duì)渦輪葉輪的可靠性進(jìn)行分析與評(píng)價(jià)。

    Abstract:

    The effect of the number of blades and load application on the reliability of turbine impeller was studied, and the reliability and failure rate models of turbine impeller of turbocharger under ultimate load were developed. The structural characteristics of turbine impeller were analyzed, and the probability distribution function of strength of turbine impeller capable of reflecting the effect of the number of blades was derived. For the failure mode caused by the ultimate load of over speed, the models of reliability, failure rate and mean life of turbine impeller were developed, which could embody the effect of the number of blades, load, strength and the operating cycles. Taking a turbocharger as an example, the behavior of the reliability and failure rate of turbine impeller changing as the number of operating cycles was studied. The results showed that as the number of operating cycle increased, the reliability of turbine impeller decreased, and the failure rate also decreased and approached to a stable value. Compared with the conventional methods, the models proposed can be applied to analyze and calculate the reliability of turbine impeller more scientifically.

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王正,王增全,郭凱,鄧春龍.增壓器渦輪葉輪極端載荷下動(dòng)態(tài)可靠性模型[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2011,42(7):32-35,49. Wang Zheng, Wang Zengquan, Guo Kai, Deng Chunlong. Dynamic Reliability Model of Turbine Impeller of Turbocharger under Ultimate Load[J]. Transactions of the Chinese Society for Agricultural Machinery,2011,42(7):32-35,49.

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