Skip to main content
Е
еаристов1-Visitor
1-Visitor
May 21, 2017
Solved

Flight of the rocket "union".

  • May 21, 2017
  • 5 replies
  • 2329 views

Hello everybody. I encountered a problem when trying to plot the dependence of the flight speed of the "union" rocket on time. The program may not be perfect, but so far the main problem that I see is the scalar "h" that appears when using the function. I hope for your help in this matter. Thank you !

Best answer by Werner_E

You sure must study the manual, help files, quicksheets, etc. more thoroughly (have you ever done?)

The errors you make a quite endless!

.) you mix up t and T

.) you invent new programming commands like else and end

.) its absolutely unclear what you intend with your two program blocks which you combine with an boolean =. I made a guess

.) you mostly have no units assigned, but you use the built in constang g, which of course is not just a number but has dimension acceleration and has the appropriate units. You can't mix up unit and unitless values

.) same unit problem at your initial conditions - suddenly you use seconds and kph - this can't work. Stay unitless when using odesolve in MC15

.) The syntax for odesolve is absolutely wrong - probably you have seen a sheet written in Prime. You have to stay with the Mathcad 15 instruction and help sheets as the syntax has changed a bit in Prime

Here is a working sheet - not sure if the function was meant that way

But of course you don't need odesolve for your problem. You can derive your functions by simple integrations:

5 replies

KenFarley
KenFarley21-Topaz II
21-Topaz II
May 22, 2017

You would likely get people to answer your question if you posted it in the Mathcad forums. This is the Creo modeling forum.

T
TmetcalfEmeritus
Emeritus
May 22, 2017

Moving the discussion to Mathcad.

Best,

Toby

    V
    ValeryOchkov24-Ruby IV
    24-Ruby IV
    May 22, 2017

    В Mathcad 15 иной синтаксис оператора If - use if and otherwise!

    -
    -MFra-21-Topaz II
    21-Topaz II
    May 22, 2017

    Hi Егор Аристов,

    Compliments! You invented a new logic, who knows how it works, the "else" is very beautiful, unfortunately it does not exist in mathcad.

    However, it would be better to describe the equation differently.

    W
    Werner_E25-Diamond IAnswer
    25-Diamond I
    May 22, 2017

    You sure must study the manual, help files, quicksheets, etc. more thoroughly (have you ever done?)

    The errors you make a quite endless!

    .) you mix up t and T

    .) you invent new programming commands like else and end

    .) its absolutely unclear what you intend with your two program blocks which you combine with an boolean =. I made a guess

    .) you mostly have no units assigned, but you use the built in constang g, which of course is not just a number but has dimension acceleration and has the appropriate units. You can't mix up unit and unitless values

    .) same unit problem at your initial conditions - suddenly you use seconds and kph - this can't work. Stay unitless when using odesolve in MC15

    .) The syntax for odesolve is absolutely wrong - probably you have seen a sheet written in Prime. You have to stay with the Mathcad 15 instruction and help sheets as the syntax has changed a bit in Prime

    Here is a working sheet - not sure if the function was meant that way

    But of course you don't need odesolve for your problem. You can derive your functions by simple integrations:

      Terms & ConditionsAccessibility statement