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Solving for impact force 2

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spduis

Mechanical
Jun 16, 2007
2
Hi all,

I have conducted impact tests of steel sphere against steel plate. I collected data of voltage generated by piezoelectric crystal of force sensor. This voltage is proporational to the displacement. Ok I have two data series(columns), first for time & displacement. In MATHCAD, how can I differentiate this displacement against time to get velocity & then acceleration. As data is in column format.

Thanking in advance.

Suhas Pawar
 
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v[i:(x[j-x[j-1)/(t[j-t[j-1) is one approach

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FAQ731-376
 
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Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
 
IRstuff provided just the velocity. Assuming the time between samples is equal then the acceleration can be calculated by

a(n):=x(n+1)-2*x(n)+x(n-1)/(delta t)^2

We have provided to very simple ways of calculating the velocity and acceleration.

There are higher order interpolation methods.
 
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