Using Mathcad to solve a system of 2 second order coupled differential equations, I issue a problem with the "D" function (used to solve a diffrentiel equation) when there is more than 1 parameter inside.
Here is the system :
I convert this system to have only first order equations :
Then, I can't find other way than making a D matrix with my parameters :
Then, I issue my problem : its seems that mathcad refuse to have a D function with more than 1 parameter :
So, if anybody here can find a way to solve this system, please let me know !
Regards
Kevin
RE: System of 2 second order coupled differential equations with Mathcad
I don't think the D array can be a two dimensional array. Here is an example controlling the level of a second tank of a two tank system
Scroll down to get to the D array. There is a lot of extra stuff. http://www.deltamotion.com/peter/Mathcad/TwoTanks/...'s%20two%20tanks%20Cascade.pdf
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RE: System of 2 second order coupled differential equations with Mathcad
You can also incorporate the parameters A, B and K into the DE, setting their derivatives to be 0.
Read the Help on rkfixed for further information.
RE: System of 2 second order coupled differential equations with Mathcad
Scroll down to get to the D array. There is a lot of extra stuff.
http://www.deltamotion.com/peter/Mathcad/TwoTanks/...'s%20two%20tanks%20Cascade.pdf
Peter Nachtwey
Delta Computer Systems
http://www.deltamotion.com