Copyright GoldSim Technology Group LLC, 2005 Slide 1 Introduction to the GoldSim Reliability Module GoldSim Technology Group Issaquah, Washington USA

Copyright GoldSim Technology Group LLC, 2005 Slide 2 What is the Reliability Module? Extension to the standard GoldSim software Allows you to construct models predicting the performance of complex engineered systems There are two versions of the reliability module: –RL Learner Edition (included with Basic GoldSim but limited to 10 reliability elements) –RL Professional

Copyright GoldSim Technology Group LLC, 2005 Slide 3 Reliability Module Elements The Reliability Module provides two special elements for building reliability models: The Function element is used to model components that perform their function over time (e.g., a pump or a battery). The Action element is used to model components that perform their action instantaneously (e.g., a switch or a relay)

Copyright GoldSim Technology Group LLC, 2005 Slide 4 What can the Reliability Module be Used for? Integrating the performance of complex, engineered systems into GoldSim models Establishing the reliability, availability, and maintainability of a system Evaluating the effect of different component choices or maintenance practices on reliability Identifying key sources of unreliability Modeling the consequences of failure

Copyright GoldSim Technology Group LLC, 2005 Slide 5 Agenda We’ll build and expand on a small example and cover many of the basic features of the Function element (the Action element is nearly identical save for the Action trigger and related outputs) Feel free to follow along on your own machines

Copyright GoldSim Technology Group LLC, 2005 Slide 6 Reliability Element Properties Property dialogs are similar to other GoldSim elements Function and Action elements share many common features

Copyright GoldSim Technology Group LLC, 2005 Slide 7 Reliability Element Outputs Both scalar and event outputs Main output is the element’s current status StartOperating and StopOperating outputs issue events when the component starts and stops operating Action element has a number of additional outputs –ActionOK and ActionFailed – emitted each time an action is successful/unsuccessful –NumActionTriggers and NumOK – show the total number of triggered actions and the total number of successful actions

Copyright GoldSim Technology Group LLC, 2005 Slide 8 Reliability Element Status The main output of each reliability element has a integer status output that can be referenced by other GoldSim elements. –>0 – failure mode n has occurred –0 – operating –-1 – unmet internal requirements –-2 – unmet external requirements –-3 – undergoing maintenance –-4 – turned off –-5 – parent not operating If an element is experiencing multiple states, the highest numbered state is shown

Copyright GoldSim Technology Group LLC, 2005 Slide 9 Workshop Syllabus Basic Reliability Modeling Concepts –The Simple Failure Rate –On/Off Triggers –Creating dependencies on other RL elements using logic-trees –Modeling an RL element as a system –Using advanced failure mode options

Copyright GoldSim Technology Group LLC, 2005 Slide 10 Simple Failure Rate The element fails according to an Exponential/Poisson distribution It only ages when it is turned on It is not repaired unless a Replace action is triggered

Copyright GoldSim Technology Group LLC, 2005 Slide 11 On and Off Triggers These allow you to turn the component on and off during the simulation Work exactly the same way as triggers in basic GoldSim By default, the component is on at the start of the simulation. You can specify the component is initially off by clearing the “Initial Status is On” checkbox.

Copyright GoldSim Technology Group LLC, 2005 Slide 12 An Example Let’s create a pump that has a simple failure rate of 1/30 days. It’s initially on and then turned off between 25 and 75 days If the pump moves 600 cubic meters per hour, how much water is pumped in 100 days?

Copyright GoldSim Technology Group LLC, 2005 Slide 13 Representing Dependencies In many cases, a component cannot be operated unless a number of other supporting systems are operating (or operable) These type of systems can be modeled using the reliability element’s logic-tree

Copyright GoldSim Technology Group LLC, 2005 Slide 14 Turning a Reliability Element into a System Elements modeled as systems retain all of the features of a reliability element (outputs, failure modes and requirements) Systems also mimic the capabilities of a container (e.g., other reliability and basic GoldSim elements can be placed inside the system) Adds a second logic-tree to the element (Internal Requirements)

Copyright GoldSim Technology Group LLC, 2005 Slide 15 Logic Trees Logic-trees allow you to specify the conditions that must exist for the component to successfully operate GoldSim supports both requirements- trees (OK = true) and fault-trees (OK = false)

Copyright GoldSim Technology Group LLC, 2005 Slide 16 Logic Trees (cont.) Two classes of logic-tree nodes: –Gate nodes AND OR N-Vote –Variable nodes Condition Not RL Component Not RL Component

Copyright GoldSim Technology Group LLC, 2005 Slide 17 Continuing the Example Let’s add an external dependency that links to a Power Status element Let’s turn the pump into a system and then add a motor and impeller element

Copyright GoldSim Technology Group LLC, 2005 Slide 18 Advanced Failure Mode Modeling An exponential failure mode is often not adequate for modeling the behavior of a complex component More detailed failure modeling can be done on the Failure Modes page (enabled by clearing the “Use Simple Failure Rate” option)

Copyright GoldSim Technology Group LLC, 2005 Slide 19 Advanced Failure Mode Modeling Modes can be added/removed using the Add and Remove buttons Descriptions of each failure mode can be edited ID numbers for each failure mode can be any integer between 1 and 99 (remember if a system is affected by multiple modes, the highest numbered mode is displayed) Parameters will changed depending on the failure mode currently selected Automatic repair can be specified for each mode (according to an Exponential, Lognormal or Gamma distribution)

Copyright GoldSim Technology Group LLC, 2005 Slide 20 Continuing the Example Let’s remove the simple failure mode for the Parent pump element and add a failure mode (with repair) to the motor and impeller inside the pump

Copyright GoldSim Technology Group LLC, 2005 Slide 21 Reliability Module Results Reliability results are accessed through a tab in each reliability element Standard metrics are displayed at the top of the dialog More detailed results can be accessed through the Analysis Options buttons