How to compensate drift in solving numerical differential equation
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Hi
I work with experimental data from a force platform for human experiment. This platform records forces in the 3 dimensions, Fx, Fy, Fz. Sampling frequency is 50 Hz or 500 Hz.
Thanks to theses forces I would like to calculate velocities of the center of mass of the body and then the mechanical work of theses forces. To do this I must solve two differentials equations successively.
1st to get velocities V : dV/dt=F/M (M is the body mass)
2nd to get work W : dW/dt=F*V
I used ode113 or a personal function using Adams numerical method.
What's the best way to solve such equations, with F being vectors of experimental data and not mathematical function ?
Drift appears in the solutions, what kind of method should be used to avoid it ?
Thanks
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