Example Using Success Failure Paths in Phase Diagrams - Revision history

Lisa Hacker at 21:01, 18 September 2023

2023-09-18T21:01:22Z

← Older revision		Revision as of 21:01, 18 September 2023
Line 1:		Line 1:
	<noinclude>{{Banner BlockSim Examples}}{{Navigation box}}		<noinclude>{{Banner BlockSim Examples}}{{Navigation box}}
	''This example appears in the [~~[Reliability_Phase_Diagrams_(RPDs)#The_Success_and_Failure_Path\|~~System ~~Analysis Reference book]~~]''.		''This example appears in the [https://help.reliasoft.com/reference/system_analysis System analysis reference]''.
	</noinclude>		</noinclude>
	= Success/Failure Paths =		= Success/Failure Paths =

Richard House: /* Scenario 2 */

2016-01-05T23:09:13Z

Scenario 2

← Older revision		Revision as of 23:09, 5 January 2016
Line 42:		Line 42:
	#At 1934 hours, Block B fails in Phase 1. This failure doesn't bring the system down because in Phase 1, the system is in parallel structure. After Phase 1, the system goes into Phase 2 and the failure of Block B brings they system down in Phase 2. However, the system doesn't go into Maintenance Phase 3 immediately because the path between them is a success path. The system goes into Maintenance Phase 3 after Phase 2 ends, and Block B gets CM and Block A gets PM there.		#At 1934 hours, Block B fails in Phase 1. This failure doesn't bring the system down because in Phase 1, the system is in parallel structure. After Phase 1, the system goes into Phase 2 and the failure of Block B brings they system down in Phase 2. However, the system doesn't go into Maintenance Phase 3 immediately because the path between them is a success path. The system goes into Maintenance Phase 3 after Phase 2 ends, and Block B gets CM and Block A gets PM there.

	[[Image:Phase Up Down plot for Example 2.png\|center\|~~500px~~\|link=]]		[[Image:Phase Up Down plot for Example 2.png\|center\|650px\|link=]]

Richard House: /* Scenario 1 */

2016-01-05T23:08:57Z

Scenario 1

← Older revision		Revision as of 23:08, 5 January 2016
Line 29:		Line 29:
	#At 1669 hours, Block A fails in Phase 2, which brings down the system and the system goes into Maintenance Phase 3 immediately. Block A gets CM and Block B gets PM.<br>		#At 1669 hours, Block A fails in Phase 2, which brings down the system and the system goes into Maintenance Phase 3 immediately. Block A gets CM and Block B gets PM.<br>

	[[Image:Phase Up Down plot for Example 1.png\|center\|~~500px~~\|link=]]		[[Image:Phase Up Down plot for Example 1.png\|center\|650px\|link=]]

	=== Scenario 2 ===		=== Scenario 2 ===

Richard House: /* Scenario 1 */

2015-12-11T20:01:36Z

Scenario 1

← Older revision		Revision as of 20:01, 11 December 2015
Line 20:		Line 20:
	Suppose the phase diagram is as shown next. The maintenance phase has a CM with duration 80 hours and PM with duration 20 hours for both Block A and B. Phase 1 has a duration 100 hours and Phase 2 has a duration 500 hours. If there is no failure in Phase 1, upon finish, it goes to Phase 2. If there is a failure in Phase 1, it would immediately go to Maintenance Phase 3. If there is no failure in Phase 2, upon finish, it goes back to Phase 1. If there is a failure in Phase 2, it would immediately go to Maintenance Phase 3.		Suppose the phase diagram is as shown next. The maintenance phase has a CM with duration 80 hours and PM with duration 20 hours for both Block A and B. Phase 1 has a duration 100 hours and Phase 2 has a duration 500 hours. If there is no failure in Phase 1, upon finish, it goes to Phase 2. If there is a failure in Phase 1, it would immediately go to Maintenance Phase 3. If there is no failure in Phase 2, upon finish, it goes back to Phase 1. If there is a failure in Phase 2, it would immediately go to Maintenance Phase 3.

	[[Image:Phase Example 1.png\|center\|~~500px~~\|link=]]		[[Image:Phase Example 1.png\|center\|450px\|link=]]

	The Block Up/Down plot is shown below:		The Block Up/Down plot is shown below:

Richard House: /* Scenario 2 */

2015-12-11T19:59:06Z

Scenario 2

← Older revision		Revision as of 19:59, 11 December 2015
Line 35:		Line 35:
	Now suppose that the phase diagram is as follows, where everything is the same as in Example 1 except that the path from Phase 2 to Maintenance Phase 3 changes from a failure path to a success path. This means that whether or not there is a failure in Phase 2, the system would go to the Maintenance Phase 3 after Phase 2. But if there is a failure in Phase 2, the system would go to the Maintenance Phase 3 after Phase 2, not immediately.		Now suppose that the phase diagram is as follows, where everything is the same as in Example 1 except that the path from Phase 2 to Maintenance Phase 3 changes from a failure path to a success path. This means that whether or not there is a failure in Phase 2, the system would go to the Maintenance Phase 3 after Phase 2. But if there is a failure in Phase 2, the system would go to the Maintenance Phase 3 after Phase 2, not immediately.

	[[Image:Phase Example 2.png\|center\|~~450px~~]]		[[Image:Phase Example 2.png\|center\|500px\|link=]]

	The Block Up/Down plot is shown below:		The Block Up/Down plot is shown below:
Line 42:		Line 42:
	#At 1934 hours, Block B fails in Phase 1. This failure doesn't bring the system down because in Phase 1, the system is in parallel structure. After Phase 1, the system goes into Phase 2 and the failure of Block B brings they system down in Phase 2. However, the system doesn't go into Maintenance Phase 3 immediately because the path between them is a success path. The system goes into Maintenance Phase 3 after Phase 2 ends, and Block B gets CM and Block A gets PM there.		#At 1934 hours, Block B fails in Phase 1. This failure doesn't bring the system down because in Phase 1, the system is in parallel structure. After Phase 1, the system goes into Phase 2 and the failure of Block B brings they system down in Phase 2. However, the system doesn't go into Maintenance Phase 3 immediately because the path between them is a success path. The system goes into Maintenance Phase 3 after Phase 2 ends, and Block B gets CM and Block A gets PM there.

	[[Image:Phase Up Down plot for Example 2.png\|center]]		[[Image:Phase Up Down plot for Example 2.png\|center\|500px\|link=]]

Richard House: /* Scenario 1 */

2015-12-11T19:58:36Z

Scenario 1

← Older revision		Revision as of 19:58, 11 December 2015
Line 29:		Line 29:
	#At 1669 hours, Block A fails in Phase 2, which brings down the system and the system goes into Maintenance Phase 3 immediately. Block A gets CM and Block B gets PM.<br>		#At 1669 hours, Block A fails in Phase 2, which brings down the system and the system goes into Maintenance Phase 3 immediately. Block A gets CM and Block B gets PM.<br>

	[[Image:Phase Up Down plot for Example 1.png\|center]]		[[Image:Phase Up Down plot for Example 1.png\|center\|500px\|link=]]

	=== Scenario 2 ===		=== Scenario 2 ===

Richard House: /* Success/Failure Paths */

2015-12-11T19:56:11Z

Success/Failure Paths

← Older revision		Revision as of 19:56, 11 December 2015
Line 10:		Line 10:
	For example, consider a system whose RBDs for Phase 1 and Phase 2 are as shown in the figure below:		For example, consider a system whose RBDs for Phase 1 and Phase 2 are as shown in the figure below:

	[[Image:RBD for Phase 1 and 2.png\|center\|~~450px~~]]		[[Image:RBD for Phase 1 and 2.png\|center\|500px\|link=]]

	In Phase 1, Block A follows Weibull distribution with Beta = 1.5 and Eta = 1000 hours. Block B follows Weibull distribution with Beta = 1.5 and Eta = 1200 hours. No maintenance.		In Phase 1, Block A follows Weibull distribution with Beta = 1.5 and Eta = 1000 hours. Block B follows Weibull distribution with Beta = 1.5 and Eta = 1200 hours. No maintenance.
Line 20:		Line 20:
	Suppose the phase diagram is as shown next. The maintenance phase has a CM with duration 80 hours and PM with duration 20 hours for both Block A and B. Phase 1 has a duration 100 hours and Phase 2 has a duration 500 hours. If there is no failure in Phase 1, upon finish, it goes to Phase 2. If there is a failure in Phase 1, it would immediately go to Maintenance Phase 3. If there is no failure in Phase 2, upon finish, it goes back to Phase 1. If there is a failure in Phase 2, it would immediately go to Maintenance Phase 3.		Suppose the phase diagram is as shown next. The maintenance phase has a CM with duration 80 hours and PM with duration 20 hours for both Block A and B. Phase 1 has a duration 100 hours and Phase 2 has a duration 500 hours. If there is no failure in Phase 1, upon finish, it goes to Phase 2. If there is a failure in Phase 1, it would immediately go to Maintenance Phase 3. If there is no failure in Phase 2, upon finish, it goes back to Phase 1. If there is a failure in Phase 2, it would immediately go to Maintenance Phase 3.

	[[Image:Phase Example 1.png\|center\|~~350px~~]]		[[Image:Phase Example 1.png\|center\|500px\|link=]]

	The Block Up/Down plot is shown below:		The Block Up/Down plot is shown below:

Lisa Hacker at 16:48, 11 June 2013

2013-06-11T16:48:14Z

← Older revision		Revision as of 16:48, 11 June 2013
Line 6:		Line 6:
	For a failure path, on system failure, the system goes to somewhere immediately when the failure occurs. For a success path, if there is no system failure during this phase, the system goes to somewhere by the end of the current phase.		For a failure path, on system failure, the system goes to somewhere immediately when the failure occurs. For a success path, if there is no system failure during this phase, the system goes to somewhere by the end of the current phase.

	In ~~'''~~BlockSim 7~~'''~~, there was only one path from each phase. The failure outcome for each phase was defined via a drop-down list. The success and failure paths used in ~~'''~~BlockSim 8~~'''~~ make it easy to see what will happen upon success or failure for each block. They also allow you to create more complex phase diagrams, in which success and failure may lead to entirely different sets of phases. In addition, they offer an additional possible outcome of failure. Previously, the outcome of failure could be maintenance, stopping the simulation or continuing the simulation; now another possible outcome of failure can be continuing simulation on a different path.		In BlockSim 7, there was only one path from each phase. The failure outcome for each phase was defined via a drop-down list. The success and failure paths used in BlockSim 8 and above make it easy to see what will happen upon success or failure for each block. They also allow you to create more complex phase diagrams, in which success and failure may lead to entirely different sets of phases. In addition, they offer an additional possible outcome of failure. Previously, the outcome of failure could be maintenance, stopping the simulation or continuing the simulation; now another possible outcome of failure can be continuing simulation on a different path.

	For example, consider a system whose RBDs for Phase 1 and Phase 2 are as shown in the figure below:		For example, consider a system whose RBDs for Phase 1 and Phase 2 are as shown in the figure below:

Melinda Caroline at 00:49, 23 August 2012

2012-08-23T00:49:04Z

← Older revision		Revision as of 00:49, 23 August 2012
Line 16:		Line 16:
	In Phase 2, Block A follows Weibull distribution with Beta = 1.5 and Eta = 900 hours. Block B follows Weibull distribution with Beta = 1.5 and Eta = 1150 hours. No maintenance.		In Phase 2, Block A follows Weibull distribution with Beta = 1.5 and Eta = 900 hours. Block B follows Weibull distribution with Beta = 1.5 and Eta = 1150 hours. No maintenance.

	== Scenario 1 ==		=== Scenario 1 ===

	Suppose the phase diagram is as shown next. The maintenance phase has a CM with duration 80 hours and PM with duration 20 hours for both Block A and B. Phase 1 has a duration 100 hours and Phase 2 has a duration 500 hours. If there is no failure in Phase 1, upon finish, it goes to Phase 2. If there is a failure in Phase 1, it would immediately go to Maintenance Phase 3. If there is no failure in Phase 2, upon finish, it goes back to Phase 1. If there is a failure in Phase 2, it would immediately go to Maintenance Phase 3.		Suppose the phase diagram is as shown next. The maintenance phase has a CM with duration 80 hours and PM with duration 20 hours for both Block A and B. Phase 1 has a duration 100 hours and Phase 2 has a duration 500 hours. If there is no failure in Phase 1, upon finish, it goes to Phase 2. If there is a failure in Phase 1, it would immediately go to Maintenance Phase 3. If there is no failure in Phase 2, upon finish, it goes back to Phase 1. If there is a failure in Phase 2, it would immediately go to Maintenance Phase 3.
Line 31:		Line 31:
	[[Image:Phase Up Down plot for Example 1.png\|center]]		[[Image:Phase Up Down plot for Example 1.png\|center]]

	== Scenario 2 ==		=== Scenario 2 ===

	Now suppose that the phase diagram is as follows, where everything is the same as in Example 1 except that the path from Phase 2 to Maintenance Phase 3 changes from a failure path to a success path. This means that whether or not there is a failure in Phase 2, the system would go to the Maintenance Phase 3 after Phase 2. But if there is a failure in Phase 2, the system would go to the Maintenance Phase 3 after Phase 2, not immediately.		Now suppose that the phase diagram is as follows, where everything is the same as in Example 1 except that the path from Phase 2 to Maintenance Phase 3 changes from a failure path to a success path. This means that whether or not there is a failure in Phase 2, the system would go to the Maintenance Phase 3 after Phase 2. But if there is a failure in Phase 2, the system would go to the Maintenance Phase 3 after Phase 2, not immediately.

Melinda Caroline at 00:47, 23 August 2012

2012-08-23T00:47:47Z

← Older revision		Revision as of 00:47, 23 August 2012
Line 2:		Line 2:
	''This example appears in the [[Reliability_Phase_Diagrams_(RPDs)#The_Success_and_Failure_Path\|System Analysis Reference book]]''.		''This example appears in the [[Reliability_Phase_Diagrams_(RPDs)#The_Success_and_Failure_Path\|System Analysis Reference book]]''.
	</noinclude>		</noinclude>
	= ~~The~~ Success ~~and~~ Failure ~~Path~~ =		= Success/Failure Paths =

	For a failure path, on system failure, the system goes to somewhere immediately when the failure occurs. For a success path, if there is no system failure during this phase, the system goes to somewhere by the end of the current phase.		For a failure path, on system failure, the system goes to somewhere immediately when the failure occurs. For a success path, if there is no system failure during this phase, the system goes to somewhere by the end of the current phase.