I've been working on a problem to determine the formulas for two sinusoidal fibers that are tangent to each other, as shown in the attached picture. I've already pursued this problem with the GRG Solver built into Microsoft Excel and determined that there are multiple solutions, but I wanted to transition to Mathcad. After entering the governing parameters and constraints I found that the solver functions if my guess is the same as one of my solutions, but if I change a guess (specifically for A1 or D1 in the file) it will not solve.
I don't know if I'm doing something wrong with Mathcad or my constraint equations, or if I'm just experiencing limitations of the solver.
I attached my Mathcad file with the most trivial solution entered, as determined by hand. Slightly changing A1 from 1 to 1.1 causes the solver to fail.
Can anyone provide any insight on this? Thanks in advance.
1 ACCEPTED SOLUTION
Accepted Solutions
Your function definitions will only use the current, initial values of x1, xt, etc.
To make them work with the changed/iterated values of the solve block, you must make them arguments of those functions.
E.g.
And this functions and variables should be defined before the solve block - they are neither guess values for the solved for variables nor constraints.
WE
Your function definitions will only use the current, initial values of x1, xt, etc.
To make them work with the changed/iterated values of the solve block, you must make them arguments of those functions.
E.g.
And this functions and variables should be defined before the solve block - they are neither guess values for the solved for variables nor constraints.
WE
If you do as Werner indicated, you should get something like this:
And see that it works for A beyond 1.1.
Success!
Luc
This is the result found for a guess value of A= -1.11:
And additionally changing the guess value for x1=2 gives:
Luc
