shock damping and attenuation measurement
TRANSCRIPT
Shock Damping and AttenuationDesktop Experiments
3/23/2017 rev ADon Blanchet
3B Associates
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