PV Value is a primary parameter for evaluating performance of P/M Self-Lubrication bearing. This paper introduce its PV value and determining method.

PV值是粉末冶金含油轴承工作特性的主要参数，本文介绍了含油轴承的PV值及其测试方法。

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A Primary Factor Model (PFM) for jet engine fault diagnosis is presented, which is a kind of parameter diagnosis method based on the engine fault equation.

提出了发动机故障论断的主因子模型。这是一种基于故障方程的参数诊断方法。

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The parameter steering method for design optimization is presented to solve problems in the primary design phase, such as absence of design knowledge and difficulty to get primary schemes quickly.

针对初步设计阶段设计自由度大而设计知识相对缺乏的矛盾，提出了设计优化参数驾驭方法。

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