Determine and Designthe Best ALT

Fred Schenkelberg, ConsultantJanuary 23rd thru 26th, 2012

RAMS Session 13C

Selection Criteria

Selection CriteriaMeaningful Results

Selection CriteriaMeaningful ResultsMeasures

Threshold

Unrelated

Surrogate

Direct

Meaningful Results:Measures

Meaningful ResultsMeasuresCost

Selection Criteria

Threshold

Prohibitive

Budget

Inexpensive

Cost

Meaningful ResultsMeasuresCostPrecisionDurationSamples

Selection Criteria

ALT APPROACHESConsider the alternative ways to conduct the testing

Example CaseCapacitor24/7 operationHigh voltage loadOutdoor environment

Insulation breakdown failure mechanism

Let’s consider some ALT options

Time Compression

Build a Model

Given a Model

Peck’s Relationship

Step Stress

Degradation

Example CaseCapacitor24/7 operationHigh voltage loadOutdoor environment

Insulation breakdown failure mechanism

3 viable ALT options

SelectAssume a Model

ALT Selection

Questions?