View source for Multiple Systems (Known Operating Times) Data Reference Example

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This example compares the results for multiple systems (known operating times) data.


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MIL-HDBK-189A, Section 6.3.1.6.4, pg. 156, 2009.


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{| {{table}}
!colspan="3"|Termination Time = 300 hours
* = system failed
|-
!Prototype #1
!Prototype #2
!Cumulative Time
|-
| *2.6||0||2.6
|-
| *16.5||0||16.5
|-
| *16.5||0||16.5
|-
| *17||0||17
|-
| 20.5||*0.9||21.4
|-
| 25.3||*3.8||29.1
|-
| 28.7||*4.6||33.3
|-
| *41.8||14.7||56.5
|-
| *45.5||17.6||63.1
|-
| 48.6||*22||70.6
|-
| 49.6||*23.4||73
|-
| *51.4||26.3||77.7
|-
| *58.2||35.7||93.9
|-
| 59||*36.5||95.5
|-
| 60.5||*37.6||98.1
|-
| *61.9||39.1||101.1
|-
| *76.6||55.4||132
|-
| 81.1||*61.1||142.2
|-
| *84.1||63.6||147.7
|-
| *84.7||64.3||149
|-
| *94.6||72.6||167.2
|-
| 104.8||*85.9||190.7
|-
| 105.9||*87.1||193
|-
| *108.8||89.9||198.7
|-
| 132.4||*119.5||251.9
|-
| 132.4||*150.1||282.5
|-
| 132.4||*153.7||286.1
|}



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Beta = 0.716, Lambda – 0.454

DMTBF = 15.5 hours

Using significance level = 0.05. CVM = 0.091. Critical value = 0.218. Since CVM < critical value can fail to reject hypothesis that model fits the data.


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[[image:MIL-HDBK-189A 6.3.1.6.4 Example_Results.png|center]] 


[[image:MIL-HDBK-189A 6.3.1.6.4 Example_Stat Tests.png|center]]