I am using the accelerometer (7264D-2KTZ-2-360) to measure the value of acceleration and multiply with mass to get impact force.
For a mass of 4 kg (timber), dropped at the velocity of 4 m/sec on an aluminum panel, I am getting the contact force of 80kN from my numerical model. And when I take acceleration as field output, it's around 1200 m/sec2. However, I am getting the value of the acceleration of around 17 gs (170 m/sec2) from the experiment.
Back calculating my gs from the numerical model gives around 130 gs. I was wondering if such a high value of g is possible for such a low velocity of impact.
The acceleration you'll get will depend on interaction with the impact surface; i.e. a hard surface will result in higher acceleration due to shorter interaction time. In other words, you need to consider the time to zero velocity from the 4m/s impact (the deceleration). Above 100g seems high for impacting wood but conversely a metal on metal impact could results in much higher accelerations.
I'd be concerned your measurement results in a factor 10 difference. Maybe check the sensitivites of the accelerometers are correct in the data acquisition, a factor 10 out would explain the measurement difference; this could also come from a mistake between m/s2 and g values for sensitivity in the data acq.
Thanks, Kirk for the response. I have doubt in factor but the value of contact force I am getting from my Numerical model is relatively higher. its around 80 KN
Using the Accelerometer is only for determining the magnitude of the impact force. It can't find the impact force
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