涡轮冷却器寿命评估的一般方法

COMMON METHOD OF THE LIFE EVALUATION FOR THE TURBINE COOLER

阐述了涡轮冷却器依据威布尔分布运用最小二乘法进行寿命评估的基本程序和计算方法。涡轮冷却器（以下简称涡轮）是飞机环控系统的重要机载设备，属高速旋转的叶片机械。由于涡轮长期处在高速且变载荷的工作状态（转速可高达１０００００ｒ／ｍｉｎ），要对其进行寿命评估较为困难。涡轮寿命的薄弱环节主要是滚动轴承的磨损，它是在特定环境条件下，随时间的延续而出现失效的随机现象。因为通过大量的长期的厂内试验而找出产品寿命的统计规律极不经济也不现实，所以采取的主要技术途径是外场信息法。外场信息的子样数大，环境条件逼真，可信度高。统计了大量外场数据，经过处理及对产品薄弱环节分析论证，证实涡轮的寿命主要服从威布尔分布。

This article elaborates the basic program and the counting method of the life evaluation with feast squares according to Weibull distribution for the turbine cooler. The turbine cooler (thereinafter for short turbine) is a rotation part of high speed for the airplane environment control system. It is difficult to evaluate the life of the turbine as it always works with high speed and variable load (the speed can be 100,000 r/min) . The main negative influence on the turbine life is the wear out of lapse roll bearing which is a stochastic phenomenon with continuation of time under a special condition. It is not economical nor practical to find the life evaluation through abundant and long term sampling test. So the primary technical approach is the outfield information ,which has advantages of numerous sub samples life like environment condition and high reliability with a large number of outfield date statistics diagnosing the weakness of products. It is confirmed that the turbine life is in accordance with Weibull distribution.