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Vibration and Shock Test, Fixture, Design,
Fabrication and Usage
Overview for management and
participants
- Purpose of environmental testing, particularly
vibration and shock
- Types of vibration tests: resonance
search/dwell, fatigue, specification
- Approximate scheduling so managers can audit
special topics
Quiz for evaluation of attendee
prior knowledge
Classical sinusoidal vibration
never observed in service; useful concept
- Introduction: terminology, structural
resonant behavior, isolation
- Sinusoidal vibration measurements:
units, sensors, readouts, errors
- Short review of vibration and shock
calibration
Complex vibration; introduction
to spectrum analysis
Instrumentation for measuring
shock in service and during tests
- Sensors, readouts, errors
- Calibration
- Shock spectrum analysis; shock response
spectrum
- Pyro Shock
Sinusoidal vibration testing
- Electrohydraulic and electrodynamic
shakers; theory, tradeoffs, limits
- Power amplifier theory, operation,
limitations, distortion effects
- Controls for sinusoidal vibration testing
- Sinusoidal vibration test practice
- Interpretation of standards; e.g.
MIL-STD-810
- Controversial test methodology: tracking
filters, switching and averaging among sensors
Introduction to random vibration
- Sources of random vibration and transportation
- 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
- Shaker control; methods and limits
Combined environment (CERT)
testing; reliability tests, e.g. MIL-STD-781
Shock testing standards and
methods
- Shock testing machines; limitations
- Use of shaker
- Pyro shock testing
Vibration and shock test fixtures
- Recommended designs, materials, fabrication
methods
- Experimental evaluation before use
- Practical limits: transverse motion;
specimen size and weight
Summary of course, optional
final examination; award of certificates
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