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12-21-2015
06:50 PM

12-21-2015
06:50 PM

Solve block problem - 5 eqn & 5 unknowns --> 3 zeros

What does having three zeros ans a solution to a problem with five equations and five unknowns.

Is this problem really divergent? These are measured spring stiffness values by a series of tests so that tweaking the values is completely acceptable within reasonable bounds.

Than you,

Eric

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12-21-2015
08:29 PM

12-21-2015
08:29 PM

Re: Solve block problem - 5 eqn & 5 unknowns --> 3 zeros

If you add the keywords "fully" and "simplify" you get a 5 element vector:

This means you can take any values for K.s1 and K.s2 but the other three variables have to be zero.

Thats interesting, as it would mean a lot of divisions by zero.

I guess thios means that you should have another look at your equations - looks like something is wrong here.

WE

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12-22-2015
10:36 AM

12-22-2015
10:36 AM

Re: Solve block problem - 5 eqn & 5 unknowns --> 3 zeros

Thank you. Is there a way to specify a tolerance? Instead of setting the left side equal to the right side, can I somehow specify +/-10% or something like that?

I will check my equations again, but that will be my 10th time if not more.

Thank you,

Eric

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12-22-2015
12:28 PM

12-22-2015
12:28 PM

Re: Solve block problem - 5 eqn & 5 unknowns --> 3 zeros

No, there is no way to specify a tolerance.

Use the symbolic processor to do the checking. It can tell you a lot. See the attached worksheet.