Multi-Phase Data

Reliability data can be analyzed across multiple phases. This is useful when an overall reliability growth program is planned and involves multiple test phases. The data types available for analyzing multi-phase data with the RGA software are:

Multi-Phase Failure Times Data
Multi-Phase Grouped Failure Times Data
Multi-Phase Mixed Data

Multi-Phase Failure Times Data

This data type can be used for tests that span multiple phases and the exact failure times are recorded. Figure 3.15 shows an example of multi-phase failure times data, where the different events signify failures (F), test phases (PH) or analysis points (AP).

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Figure 3.15: Multi-phase failure times data

Multi-Phase Grouped Failure Times Data

This data type can be used for tests that span multiple phases and the exact failure times are unknown. Only the number of failures within a time interval are recorded, as shown in Figure 3.16.

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Figure 3.16: Multi-phase grouped failure times data

Multi-Phase Mixed Data

This data type can be used for tests that span multiple phases and it allows for configuration in groups, individual trial by trial, or a mixed combination of individual trials and configurations of more than one trial. An example of this data type can be seen in Figure 3.17.

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Figure 3.17: Multi-phase mixed data

Models for Multi-Phase Data

The Crow Extended - Continuous Evaluation model is used to analyze data across multiple phases.