copyright goldsim technology group llc, 2005 slide 1 introduction to the goldsim reliability module...
TRANSCRIPT
Copyright GoldSim Technology Group LLC, 2005
Slide 1
Introduction to the GoldSim Introduction to the GoldSim Reliability ModuleReliability Module
GoldSim Technology GroupIssaquah, 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