Fielded Systems

Fielded systems are systems that are used by customers in the field and for which failure information is not derived from an in-house test. This type of data is analogous to warranty data. The data types available for fielded systems data entry are:

Repairable Systems
Fleet

Repairable Systems

Repairable Systems data is identical in format to the Multiple Systems (Unknown Equivalent Times) data. It also can be viewed in normal or advanced view format. Figure 3.13 illustrates a sample data set. In repairable systems, the purpose of the analysis is not to evaluate reliability growth but rather to obtain reliability estimates for the system, including expected number of failures, reliability at a given time, and so forth.

Figure 3.13: Repairable systems data

Models for Repairable Systems

The Power Law model is utilized for Repairable Systems data. This model is described in the Fielded Systems chapter of this on-line reference.

Fleet

This data type is used to analyze the entire population (fleet). The data entry for this data type is similar to the data entry for repairable systems; however, the overall data analysis is again different. In repairable systems, you are interested in the reliability of a single system, whereas in a fleet analysis, you are interested in the entire fleet. Figure 3.14 presents an example of data entered for fleet analysis.

Figure 3.14: Fleet systems data

Models for Fleet Data

The following models can be used to analyze fleet data. Models and examples using different data types are discussed in later chapters of this on-line reference.