This paper addresses the issue of detecting dominating failure modes of a system from a two-dimensional warranty data set by analyzing conditional failure profile of the system. Two testing procedures have been proposed to test whether any of the failure modes is dominating at a particular time interval and whether there is a change of the failure profile from one time interval to another disjoint time interval, conditioning on a given usage layer. Detecting the problematic failure modes early from the conditional failure profile and taking appropriate actions to reduce the conditional failure probability of the system can significantly reduce both tangible and intangible costs of poor reliability in any manufacturing industry. On the other hand, the study of possible changes of conditional failure profiles has a significant role to assess the field performance of items from one time interval to another time interval for a particular choice of usage layer. The utility of this study is explored with the help of a real-life data set.

本文通过分析系统的条件故障概况，解决了从二维保修数据集中检测系统的主要故障模式的问题。已经提出了两种测试程序来测试是否有任何故障模式在特定时间间隔占主导地位，以及是否存在从一个时间间隔到另一个不相交时间间隔的故障配置文件的变化，以给定的使用层为条件。在任何制造行业中，从条件故障概况中及早检测有问题的故障模式并采取适当措施降低系统的条件故障概率，可以显着降低可靠性差的有形和无形成本。另一方面，研究条件故障配置文件的可能变化对于评估特定使用层选择从一个时间间隔到另一个时间间隔的项目的现场性能具有重要作用。本研究的效用是在真实数据集的帮助下进行的。