Template:Time-to-failure data: Difference between revisions

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===Time-to-Failure Data===
#REDIRECT [[RGA_Data_Types]]
Time-to-failure (continuous) data is the most commonly observed type of reliability growth data. It involves recording the times-to-failure for the unit(s) under test. Time-to-failure data can be applied to a single unit or system or to multiple units or systems. There are multiple data entry schemes for this data type and each is presented next.
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{{grouped failure times}}
 
{{multiple systems (known operating times)}}
 
====Multiple Systems (Concurrent Operating Times)====
This data type is used for tests where a number of systems are tested and the start, end of failure times are recorded. This data type assumes uniform time accumulation and that the systems are tested simultaneously. As an example, consider the data of two systems shown in Figure fignormview. System 1 begins testing at time equals 0 (with a start event, S) and failures are encountered and corrected at 281, 312 and 776 (with failure events, F). Testing stops at 1000 hours (with an end event, E). System 2 begins testing at time equals 0 and failures are encountered and corrected at 40, 222 and 436. Testing stops at 500 hours. RGA has two options to view this type of data. Figure fignormview shows the normal view, while Figure figadvview shows the advanced view. Both figures represent the same data.
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[[Image:rga3.7.png|thumb|center|400px|Normal view for Multiple Systems (Concurrent Operating Times) data]]
 
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When entering data within the normal view, each system must be initiated with a start event. Figure fignormview shows an example of that format.
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[[Image:rga3.8.png|thumb|center|400px|Advanced view for Multiple Systems (Concurrent Operating Times) data, data for one of two systems displayed]]
 
====Multiple Systems (Concurrent Operating Times) - Using Dates====
This is similar to the previous data type except that dates are utilized along with operating hours. This assumes noncontinuous usage and the software computes equivalent (average) usage rates. Figure fignormviewdates shows an example of this in RGA.
 
 
 
[[Image:rga3.9.png|thumb|center|400px|Normal view for Concurrent Operating Times for Multiple Systems data with dates]]
 
====Multiple Systems with Event Codes====
The Multiple Systems with Event Codes data type is used to analyze the failure data from a reliability growth test in which a number of systems are tested concurrently and the implemented fixes are tracked during the test phase. With this data type, all of the systems under test are assumed to have the same system hours at any given time. Figure Figdvancedultipleventodes shows an example of this type of data.
 
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[[Image:rga3.10.png|thumb|center|400px|Advanced view for Multiple Systems with Event Codes]]
 
====Models for Time-to-Failure (Continuous) Data====
The following models can be used to analyze time-to-failure (continuous) data sets. Models and examples using the different data types are discussed in later chapters.
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:1) Duane (Chapter 4)
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:2) Crow-AMSAA (NHPP) (Chapter 5)
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:3) Crow Extended (Chapter 9)
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:4) Crow Extended - Continuous Evaluation (Chapter 10)
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Latest revision as of 01:05, 24 August 2012

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