Vibration and Shock Test, Fixture, Design, Fabrication and Usage
(V&S 512)
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
