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02-25-2019
02:45 PM

02-25-2019
02:45 PM

Hello! I am new to the PTC forums, but I had a question regarding how to format a particular differential equation into Mathcad Prime. My equation is: ads=integral(v) dv Below is a screenshot of what I have so far, but it is using my guess value as the solution, when the actual solution for Vo is 15.5 ft/s. Acceleration, a, is given to be constant at 12 ft/s^2, initial displacement, So, is given to be 0 ft, final displacement, Sf, is given to be 140 ft, final velocity, Vf, is 60 ft/s. That leaves initial velocity, Vo. The basic form of the differential equation I am employing goes a*ds=integral (v) dv where ds is the differential for displacement and dv for velocity. Any help regarding this formatting would be greatly appreciated guys! Thanks!

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02-25-2019
04:34 PM

6 REPLIES 6

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02-25-2019
03:21 PM

02-25-2019
03:21 PM

Re: Dynamics Help

I'm afraid the picture does not make clear what exactly you are trying to solve.

What is the problem description:

- what do you know (which variables and/or constants do you the value of),

- what do you need to find (what is the unknown value or function), and

- what is the expression or equation involving the knowns and the unknowns?

Do not just post a picture, preferrably post (also) the worksheet.

Success,

Luc

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02-25-2019
04:28 PM

02-25-2019
04:28 PM

Re: Dynamics Help

You should take away the v:=... and s:=... definitions from the Constraints (middle) part of the Solve block. (Definitions aren't allowed in that part)

In the Solver (lower) part you should have: Find(v0)=.

That should to it.

Success!

Luc

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02-25-2019
04:34 PM

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02-26-2019
02:15 AM

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02-26-2019
02:16 AM

02-26-2019
02:16 AM

Re: Dynamics Help

Thanks for your help. Meant to reply earlier after following your advice. Much appreciated!

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02-26-2019
02:20 AM

02-26-2019
02:20 AM

Re: Dynamics Help

Thanks for your help. Meant to reply earlier after following your advice. Much appreciated!!

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