Joel Mandel Nov,2012

The ability of a system or component to perform its required functions under stated conditions for a specified period of time(IEEE)

.

Reliability

Quality

Definitions

A degree of grade or excellence or worth

Key to Success

$Reliability

The objective of every reliability engineer is to produce a reliable project plan

The Objective of every company is to make money

The objective of every Reliability Manger is to produce a reliability plan that gives maximum reliability at minimal cost

Reliability Engineering

Project Life Cycle

IDEA

R & D Production

Reliability Engineering

Final

Product

Dolly 2

Operation /Useful

Dolly Family

Dolly 1A

Prototype

System ReliabilityAvailability

MTBF

MTTR

FMECATAAF/RGTFTA

Thermal Analysis/Demo

HALTThermalMapping

Qual testingTAAF/RG

High Accelerated Stress testing

ESS-Vibration

ESS- Temperature

Component analysisTemperature analysisLocation analysis

FRACAS

MTBF

Comparison of Reliability Models

What does Reliability Prediction give me?

Reliability predictions can be used for

assessment of whether reliability goals can be

reached, evaluation of alternative designs.

Component Specification Temperature ParetoThe most dominant parameter for component reliability is temperature. Rank components

as to maximum rated temperature(ambient /case as applicable) and analyze cost versus benefit.

Component Placement analysis The component placement should take into accountPower dissipating components should be in a good location for cooling. Surrounding these high dissipating components should be components which can with stand the increase temperature surrounding the high dissipating component

Thermal Mapping Thorough thermal mapping of all components as per prior paragraphs at worst case maximum and safety conditions . This process optimizes cost/temperature through testing many scenarios (for example for fan cooling number of fans location temperature, noise).

Design & Prototype Stage

HaltHow far is our theoretical design from real

capabilities?

.

HALT Margin Discovery

Stress

UpperDestruct

Limit

LowerDestruct

Limit

UpperOperating

Limit

LowerOperating

LimitProductSpecs

Margin Margin

OperatingOperating

Destruct Margin Destruct Margin

Halt

Temp-High Low

Temp Rapid Cycling

Vibration

Combines testing

Power

High Accelerated Life Testing

Qualification- Environmental Test Tailoring

Failure Reporting and Corrective Action System

FRACAS