Shock Damping and AttenuationDesktop Experiments

3/23/2017 rev ADon 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 methodDamping = 0.87 %

Processed - FFTs

-10db

-12db

-36db

Where is this useful ?

Where is this useful ?

0.0087