topic Re: Problem solving the equation in Mathcad

Problem solving the equation

UA_11721008 — Fri, 23 Aug 2024 06:19:45 GMT

Hello, I’m a student new to this software. I’m trying to solve D1, D2, D3, and D4 in terms of variables but need some help.

Thank you!

Re: Problem solving the equation

Werner_E — Fri, 23 Aug 2024 06:56:41 GMT

You have a linear system with four equations and four variables.

The solution can be seen with the naked eye to be D1=D2=D3=D4=0.

Don't expect Prime's symbolics to come up with something different.

The system either has one unique solution (all zeros) or an infinite number of solutions, in case the coefficient matrix is zero (e.g. if L = 0 or if a=0).

Re: Problem solving the equation

UA_11721008 — Fri, 23 Aug 2024 07:22:23 GMT

Thank you for the reply. I am new to structural dynamics, and I am sorry if this problem was obvious. Actually, I wanted to solve the mode shape for continuous beams at different locations if I knew the end conditions. I have set up the equation of mode shape in this new matched file. The author didn't solve the equation in his textbook, and it was difficult for me to solve by hand calculation. I don't know if Mathcad can provide the solution to this.

Re: Problem solving the equation

Werner_E — Fri, 23 Aug 2024 08:46:13 GMT

I don't know anything about structural dynamics, but a linear system where on the right hand side of each equation the term not dependent on the variables is zero either has the trivial solution of all variable being zero or has an infinite number of solutions if the equations are linear dependent.

Unfortunately, I can't help you set up the equations for your problem, but I can help you solving them and with the usage of Prime.

Re: Problem solving the equation

terryhendicott — Mon, 26 Aug 2024 11:28:49 GMT

Hi,

Check out this web site:-

http://www.dynamassist.com/

Cheers

Terry