Design for Vibration and Shock Testing of Telecommunications Equipment

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.