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M
MBuck21-Visitor
1-Visitor
December 30, 2011
Solved

ODE solve block functions in MathCad prime

  • December 30, 2011
  • 1 reply
  • 12718 views

Can someone explain to me why this ODE solve block procedure (see worksheet attached) is not working with MathCad Prime 1? I did a similar exercise in MathCad 15 (see image) 31-12-2011 8-25-44 AM.pngusing an equivalent formulation and all was OK. What I am trying to do is a sensitivity analysis with the parameter k which in this case is the thermal conductivity of the insulation material. For some reason the variable k does not seem to recognised by the solve block and thus the matrix of functions is not being returned to the variable.

Best answer by ValeryOchkov

Mark Buckton wrote:

Also, try as I might, I cannot get rkfixed to accept Tf as a function based on time Tf(t) this is necessary as it represents the temperature rise in a furnace which as you would expect is a function of time i.e. the temperature increased with time.something like Tf(t) = 20+345*LOG(8*t+1) as soon as you do this one gets an error see:

/servlet/JiveServlet/downloadImage/2-173291-27452/1-01-2012+10-33-26+PM.png

See my solution with t/s in the empirical formula for Tf:

odemcp-kkk.png

1 reply

V
24-Ruby IV
ValeryOchkov24-Ruby IV
24-Ruby IV
December 31, 2011

I think you must solve the task for one point and than for a set of point.

What is it W in your task? Watt or an user variable. See the attch please.

M
MBuck21-VisitorAuthor
1-Visitor
December 31, 2011

Valery

Thank you for your reply but it looks as if the file you have attached has become corrupted could you send it again.

Thanking you in advance.

Regards Mark

V
24-Ruby IV
ValeryOchkov24-Ruby IV
24-Ruby IV
December 31, 2011

Sorry - it was Prime 2. Check your units please! See the picture:

odemcp.png

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