Ruggedizing of Military COTS/NDE Equipment
(DES 512)
Overview for management and participants
- Why ruggedize commercial grade equipment?
- Summary of approaches
- Purpose and applicability of environmental testing, particularly vibration and shock
- Purposes and applicability of HALT, ESS and HASS
- Approximate scheduling so managers can audit special topics
Quiz for evaluation of attendee prior knowledge
Understanding the environments
- Vibration
- Sine - Classical sinusoidal vibration never observed in service; but useful concept
- Random - Most machinery vibration is complex; introduction to field and lab spectrum analysis
- Shock
- Temperature
- Humidity
- Other climatics including Salt atmosphere and Sand/Dust
Passive and active isolation, as in protecting against battlefield environment
- Isolating systems
- Isolating subassemblies and components
- Ruggedizing systems
- Ruggedizing subassemblies and components
Design of new equipment to withstand vibration and shock
- Do not stack resonances
- Octave rule
Thermal protection - cocooning
The need for verification testing - How to witness a test
Sinusoidal vibration testing
- Sinusoidal vibration measurements: units, sensors, readouts, errors
- Electrohydraulic and electrodynamic shaker systems; theory, tradeoffs, limits
Introduction to random vibration
- Sources of random vibration in service and transportation
- Terminology and definitions
- Spectral density measurement and analysis - the frequency domain
- Interpreting and implementing standards, e.g. MIL-STD-810
- Controls, practice
Vibration and shock test fixtures; fixtures for stress screening
Shock measurements in field and laboratory
Shock testing standards and methods
Thermal testing
- Test requirements
- Test equipment needed for thermal testing
- Chambers - their heating, cooling and control
- Instrumentation: sensors, readouts, recording
- Preparing and inspecting a typical test item for thermal testing
- Conducting a typical thermal test
- Recording of temperature data - environment and test item responses
- Data reduction and storage, checking accuracy
- Interpreting results
Additional climatic environments
Combined environment (CERT) testing; reliability tests, e.g. MIL-STD-781
Environmental stress screening (ESS) of electronics hardware production; extensions to HALT, HASS
Course summary; optional final examination; award of certificates
