HALT 510 – Highly Accelerated Life Testing, Highly Accelerated Stress Screening and Environmental Stress Screening
Overview for management and participants
- Purpose of environmental testing, particularly reliability development testing and screening
- Purpose of environmental stress screening (ESS)
- Extensions to HALT (highly accelerated life testing) and to HASS
- Types of vibration tests: resonance search/dwell, fatigue, specification
- Approximate scheduling so managers can audit special topics
Classical sinusoidal vibration never observed in service; useful concept
- Introduction: terminology, structural resonant behavior, passive and active isolation
- Sinusoidal vibration measurements: units, sensors, readouts, errors
- Calibration of sensors and systems; traceability to NIST
Introduction to spectrum analysis
Sinusoidal vibration testing (brief)
- Electrohydraulic and electrodynamic shakers; theory, tradeoffs, limits
- Power amplifier theory, operation, limitations, distortion effects
- Controls for sinusoidal vibration testing
- Sinusoidal vibration test practice
- Vibration and shock test fixtures; fixtures for stress screening
- Practical limits: transverse motion; specimen size and weight
Introduction to random vibration
- Sources of random vibration during launch, orbit, reentry
- No possible equivalence to sinusoidal vibration; terminology and definitions
- Spectral density measurement and analysis – the frequency domain
- Probability density – the time domain
Random vibration test practice
- Interpreting and implementing standards, e.g. MIL-STD-810
- Equalization before testing; methods and limits; controls
Combined environment (CERT) testing; reliability tests, e.g. MIL-STD-781
HALT
- Theory and implementation
- Equipment – Very rapid thermal cycling, omni-axial vibration
ESS
Environmental stress screening of electronics production hardware
- Evolution of screening techniques
- Equipment – chambers, vibration systems, combined environments
- Single vs. multi-axis vibration
- Pneumatic repetitive-shock machines
HASS
Highly Accelerated Stress Screening
- Uses same test equipment as HALT
- Uses HALT data to create test profiles
- Most effective method of detecting failures, extremely fast
- Proof of Screen
- Screen effectiveness
- Life valuation
Optional extensions to acoustical environment (intense noise) testing
Optional extension to mechanical shock
- Instrumentation for measuring shock in service and during tests
- Sensors, readouts, errors
- Calibration
- Shock spectrum analysis; shock response spectrum
- Shock testing standards and methods
- Shock testing machines; limitations
- Use of shaker
- Explosives
Witnessing of tests
Course summary; optional final examination; award of certificates
Contact us for pricing and information at:
(805) 456-4274 or
info@equipment-reliability.com
“This was a great course. I found the areas of attaching test articles to shakers to be very informative and helpful, providing me with the information to design fixtures and test products better. I got a lot out of the class. Thanks Wayne!”
“From the “wet behind the ears” to the “well beyond his years”, Tustin’s book is a great resource and learning tool for anyone involved, or planning to be involved, with dynamics testing of any kind. Thanks!”
