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 1

Introduction to the GoldSim Introduction to the GoldSim Reliability ModuleReliability Module

GoldSim Technology GroupIssaquah, Washington

USA


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


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)


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


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


Slide 6

Reliability Element Properties

Property dialogs are similar to other GoldSim elements

Function and Action elements share many common features


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


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


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


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


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.


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?


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


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)


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)


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


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


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)


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)


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


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

Documents

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