Solving for impact force 2

[spduis]

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

 

[IRstuff]

v[ix[j-x[j-1)/(t[j-t[j-1) is one approach

TTFN

FAQ731-376

 

[GregLocock]

Wow, that's a complicated emoticon.

Cheers

Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[PNachtwey]

IRstuff provided just the velocity. Assuming the time between samples is equal then the acceleration can be calculated by

a:=x(n+1)-2*x+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.