Brief overview for management and participants

Classical approach to thermal environmental testing – simulation

Purpose of environmental testing during development

• Purpose of HALT – highly accelerated life testing
• Purpose of environmental stress screening (ESS) as production step
  • Initially 100%; later sampling
  • Commonly-used tools: thermal ramping and random vibration
  • Importance of rapid thermal ramping
  • Opportunity to determine and extend limits during product development

Classical sinusoidal vibration never observed in service; useful concept

• Introduction: terminology, importance of understanding resonant behavior
• Electrohydraulic and electrodynamic shaker systems
• Resonance searches and dwells

Introduction to random vibration

• Sources of random vibration in service and transportation
• Spectral density measurement and analysis – the frequency domain
• Probability density – the time domain

Random vibration test practice – simulation

• Interpreting, implementing, ignoring military standards, e.g. MIL-STD-810
• Recommended test practices, e.g. IEST
• Equalization before testing; methods and limits

Determining and extending limits – stimulation

• HALT – highly accelerated life testing during product development
• HASS – highly accelerated stress screening (post production)
• ESS – Environmental stress screening of electronics hardware production
• Philosophical differences from testing – stimulation vs. simulation Multiple- vs. conventional single-axis-at-a-time vibration
• Conventional single-axis
• Mechanical and pneumatic repetitive shock (RS) stimulators

Attachment fixtures; vacuum hold-downs

Additional climatic verification test methods: temperature, altitude, humidity, salt spray, etc. as time permits

Summary of course for management and participants