变母体产品可靠性评估方法

Reliability Assessment Method for Varied Population Product

产品在不同阶段的技术状态是有差异的,因此在可靠性评估时不能视为同一母体,其试验数据也不能做简单的累加处理。由于试验次数较少,在进行可靠性评估时,评估值往往低于应达到的实际值。本文将各阶段的可靠性作为一个整体来研究,建立了可靠性增长评估的数学模型,导出了成败型可靠性评估方程,给出了评估方法,该方法充分利用各研制的试验信息,反映了研制产品的可靠性增长过程,为多研制阶段、变母体、试验数据较少的产品可靠性验证,提供了有效的评估途径,同时以产品数据为例计算了应达到的实际可靠性水平,计算结果表明,评估结果与产品应达到的可靠性水平基本相同。

The various technology conditions exist in different phases of product development, therefore, the products can not be treated as a population and their test data also can not be simply added together in reliability assessment. Duo to the small amount of tests conducted, the value obtained in reliability assessment is usually smaller than the actual value. This paper integrates the reliability of each phase and builds up a mathematical model for assessment of reliability growth to derive the rellability assessment equations for qualified or unqualified product. This assessment method utilizes fully the trial information from every phase to reflect the reliability growth process in product development, and provides an effective means for evaluation of reliability examination on product with multiple design phases, varied population and less test data. Meanwhile, the method is used to calculate the real reliability level of a product. The conclusion shows that the assessment result is approximately the same as the reliability level that the product reaches.