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Shock damping and attenuation measurement

Don Blanchet
Don Blanchet

Use of triaxial accelerometer and data logger to measure hammer induced shock pulses in a metal tube. Calculate attenuation and material damping ratio for use in Solidworks FEA simulation

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Shock Damping and Attenuation Desktop Experiments 3/23/2017 rev A Don Blanchet 3B Associates dwb3298@verizon.net
Tools & Goals Hammer tap testing shock measurements. Small hammer repeated blows 3 foot long steel pipe 1.6 inches diameter .060 inch wall thickness Free/free support natural frequency ringing MIDE slam stick model C data logger Measure acceleration time signal Process FFT and PSD Calculate attenuation in decibels end to end Calculate damping %
Data logger triaxial accelerometer
Input shock material damping 260 hz ringing Logarithmic decrement method Damping = 0.87 %
Processed - FFTs -10db -12db -36db
Where is this useful ?
Where is this useful ? 0.0087

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Shock damping and attenuation measurement

  • 1. Shock Damping and Attenuation Desktop Experiments 3/23/2017 rev A Don Blanchet 3B Associates dwb3298@verizon.net
  • 2. Tools & Goals Hammer tap testing shock measurements. Small hammer repeated blows 3 foot long steel pipe 1.6 inches diameter .060 inch wall thickness Free/free support natural frequency ringing MIDE slam stick model C data logger Measure acceleration time signal Process FFT and PSD Calculate attenuation in decibels end to end Calculate damping %
  • 3. Data logger triaxial accelerometer
  • 4. Input shock material damping 260 hz ringing Logarithmic decrement method Damping = 0.87 %
  • 6. Where is this useful ?
  • 7. Where is this useful ? 0.0087