Crow Extended Model for Repairable Systems Analysis Example - Revision history

Lisa Hacker at 20:54, 18 September 2023

2023-09-18T20:54:12Z

← Older revision		Revision as of 20:54, 18 September 2023
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	<noinclude>{{Banner RGA Examples}}		<noinclude>{{Banner RGA Examples}}
	''This example appears in the [~~[Repairable_Systems_Analysis\|~~Reliability ~~Growth and Repairable System Analysis Reference]~~]''.		''This example appears in the [https://help.reliasoft.com/reference/reliability_growth_and_repairable_system_analysis Reliability growth reference]''.
	</noinclude>		</noinclude>

David J. Groebel at 20:00, 2 June 2014

2014-06-02T20:00:21Z

← Older revision		Revision as of 20:00, 2 June 2014
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	<noinclude>{{Banner RGA Examples}}		<noinclude>{{Banner RGA Examples}}
	''This example appears in the [[Repairable_Systems_Analysis\|Reliability Growth and Repairable System Analysis Reference ~~book~~]]''.		''This example appears in the [[Repairable_Systems_Analysis\|Reliability Growth and Repairable System Analysis Reference]]''.
	</noinclude>		</noinclude>

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	#Calculate the projected MTBF after the delayed fixes.		#Calculate the projected MTBF after the delayed fixes.
	#If no fixes were performed for the future failures, what would be the expected number of failures at time 1,000?		#If no fixes were performed for the future failures, what would be the expected number of failures at time 1,000?


	'''Solution'''		'''Solution'''
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	<li>The next figure shows the estimated Crow Extended parameters.		<li>The next figure shows the estimated Crow Extended parameters.

	[[Image:rga13.14.png~~\|thumb~~\|center\|~~450px\|Crow Extended model for repairable systems.~~]]		[[Image:rga13.14.png\|center\|600px]]

	</li>		</li>
	<li>The next figure shows the projected MTBF at time = 541 (i.e., the age of the oldest system).		<li>The next figure shows the projected MTBF at time = 541 (i.e., the age of the oldest system).

	[[Image:rga13.15.png~~\|thumb~~\|center\|450px~~\|MTBFs from Crow Extended model.~~]]		[[Image:rga13.15.png\|center\|450px]]

	</li>		</li>
	<li>The next figure shows the expected number of failures at time = 1,000.		<li>The next figure shows the expected number of failures at time = 1,000.

	[[Image:rga13.16.png~~\|thumb~~\|center\|450px~~\|Cumulative number of failures at time = 1,000.~~]]		[[Image:rga13.16.png\|center\|450px]]
	</li>		</li>
	</ol>		</ol>

Chris Kahn at 20:36, 6 February 2014

2014-02-06T20:36:56Z

← Older revision		Revision as of 20:36, 6 February 2014
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	The failures and fixes of two repairable systems in the field are recorded. Both systems started operating from time 0. System 1 ends at time = 504 and system 2 ends at time = 541. All the BD modes are fixed at the end of the test. A fixed effectiveness factor equal to 0.6 is used. Answer the following questions:		The failures and fixes of two repairable systems in the field are recorded. Both systems started operating from time 0. System 1 ends at time = 504 and system 2 ends at time = 541. All the BD modes are fixed at the end of the test. A fixed effectiveness factor equal to 0.6 is used. Answer the following questions:

	~~:1)~~ Estimate the parameters of the Crow Extended model.		#Estimate the parameters of the Crow Extended model.
	~~:2)~~ Calculate the projected MTBF after the delayed fixes.		#Calculate the projected MTBF after the delayed fixes.
	~~:3)~~ If no fixes were performed for the future failures, what would be the expected number of failures at time 1,000?		#If no fixes were performed for the future failures, what would be the expected number of failures at time 1,000?


	'''Solution'''		'''Solution'''
	~~:1)~~ The next figure shows the estimated Crow Extended parameters.		<ol>
			<li>The next figure shows the estimated Crow Extended parameters.

	[[Image:rga13.14.png\|thumb\|center\|450px\|Crow Extended model for repairable systems.]]		[[Image:rga13.14.png\|thumb\|center\|450px\|Crow Extended model for repairable systems.]]

	~~:2)~~ The next figure shows the projected MTBF at time = 541 (i.e., the age of the oldest system).		</li>
			<li>The next figure shows the projected MTBF at time = 541 (i.e., the age of the oldest system).

	[[Image:rga13.15.png\|thumb\|center\|450px\|MTBFs from Crow Extended model.]]		[[Image:rga13.15.png\|thumb\|center\|450px\|MTBFs from Crow Extended model.]]

	~~:3)~~ The next figure shows the expected number of failures at time = 1,000.		</li>
			<li>The next figure shows the expected number of failures at time = 1,000.

	[[Image:rga13.16.png\|thumb\|center\|450px\|Cumulative number of failures at time = 1,000.]]		[[Image:rga13.16.png\|thumb\|center\|450px\|Cumulative number of failures at time = 1,000.]]
			</li>
			</ol>

Kate Racaza at 18:33, 4 February 2014

2014-02-04T18:33:17Z

← Older revision		Revision as of 18:33, 4 February 2014
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	<noinclude>{{Banner RGA Examples~~}}{{Navigation box~~}}		<noinclude>{{Banner RGA Examples}}
	''~~These examples appear~~ in the [[Repairable_Systems_Analysis\|Reliability Growth and Repairable System Analysis Reference book]]''.		''This example appears in the [[Repairable_Systems_Analysis\|Reliability Growth and Repairable System Analysis Reference book]]''.
	</noinclude>		</noinclude>

Kate Racaza: Created page with '{{Banner RGA Examples}}{{Navigation box}} ''These examples appear in the [[Repairable_Systems_Analysis|Reliability Growth and Repairable System Analysis Reference book…'

2014-01-29T19:09:59Z

Created page with '<noinclude>{{Banner RGA Examples}}{{Navigation box}} ''These examples appear in the [[Repairable_Systems_Analysis|Reliability Growth and Repairable System Analysis Reference book…'

New page

<noinclude>{{Banner RGA Examples}}{{Navigation box}}
''These examples appear in the [[Repairable_Systems_Analysis|Reliability Growth and Repairable System Analysis Reference book]]''.
</noinclude>

The failures and fixes of two repairable systems in the field are recorded. Both systems started operating from time 0. System 1 ends at time = 504 and system 2 ends at time = 541. All the BD modes are fixed at the end of the test. A fixed effectiveness factor equal to 0.6 is used. Answer the following questions:

:1) Estimate the parameters of the Crow Extended model.
:2) Calculate the projected MTBF after the delayed fixes.
:3) If no fixes were performed for the future failures, what would be the expected number of failures at time 1,000?

'''Solution'''
:1) The next figure shows the estimated Crow Extended parameters.

[[Image:rga13.14.png|thumb|center|450px|Crow Extended model for repairable systems.]]

:2) The next figure shows the projected MTBF at time = 541 (i.e., the age of the oldest system).

[[Image:rga13.15.png|thumb|center|450px|MTBFs from Crow Extended model.]]

:3) The next figure shows the expected number of failures at time = 1,000.

[[Image:rga13.16.png|thumb|center|450px|Cumulative number of failures at time = 1,000.]]