Design for Vibration and Shock Testing of Telecommunications Equipment
(DES 501)
Introduction
- Testing philosophy
- Description of types of tests
- Design Verification or Reliability?
- Vibration - Sine and Random
- Shock - Classical waveform and shock response spectrum
- Climatic
Sine Vibration Part 1
- Introduction - what design engineers need to know, terminology, structural resonant behavior , isolation, damping.
- Review of sinusoidal vibration measurements: units, sensors, readouts
Sine Vibration Part 2
- Sensors, short review of shakers, amplifiers and control techniques
- Measuring DUT responses during tests, interpreting data.
- Sinusoidal vibration test specifications - understanding and applying
Random Vibration Part 1
What designers need to know about random vibration
- Understanding random vibration
- No possible equivalence to sinusoidal vibration
- Terminology and definitions
- Measurement and analysis in the frequency and time domains
- Sensors
- Interpreting and implementing standards
Random Vibration Part 2
What designers need to know about random vibration test practice
- Measuring DUT responses during tests
- Application and understanding test results
- Vehicle and transportation environments
Test Fixtures
- Importance - design concepts, test outcome relationships
- Recommended designs, materials, fabrication methods
- Evaluation before use, why this is necessary.
- Practical limits: transverse motion; specimen size and weight
Reliability tests
- Background - industry practices
- Long term, short term, CERT, TAAF, HALT
- The use of temperature and vibration to accelerate failures
- No relationship to service environment
- Screening
- Levels of screening
- Need vs. results
- Supplier management - subassembly screening
- Importance and use of failure database - FRACAS
Shock testing
Shock testing standards and methods
- Types of shock, standards
- Shock test equipment and methods of application
- Instrumentation for measuring shock in service and during tests
- Measuring DUT responses during test
- Measuring DUT responses during test
- Introduction to Shock Response Spectrum
Selection and Application of appropriate test techniques
Service environment, expected product life
Creating and implementing a complete Reliability program
Development, qualification, reliability, screening, where do they fit into a product development cycle.
