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

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 %

5. Processed - FFTs
-10db
-12db
-36db

6. Where is this useful ?

7. Where is this useful ?
0.0087