SMath Studio - Units 3

[dik]

I'm doing some sheets in SMath Studio and am having some difficulty with units in some of the code equations. They produce a numeric value, but, the units are not consistent within the equation.

I'm currently adding another 'coefficient' that 'neutralises' the units within the equation and eliminates them, and providing a correct unit at the end of the equation for all parts.

Does anyone know of a simpler manner of overriding SMath units?

Dik

 

[MintJulep]

Rewrite the equations with a consistent set of units and convert the inputs as necessary.

 

[dik]

Thanks... I was afraid of that...

Dik

 

[IDS]

This thread discusses how to handle it in Mathcad, and I guess something similar should work in SMath:

http://www.eng-tips.com/viewthread.cfm?qid=430255

Doug Jenkins
Interactive Design Services

http://newtonexcelbach.wordpress.com/

 

[dik]

For example, the formula direct from the CSA Standard (concrete code) is Ec = (3300*sqrt(f'c)+6900)*(γ.c/2300)^1.5

where f'c is MPa, gamma is kg/m^3, c is MPa, all raised to various powers... the result is MPa. I have to introduce coefficients that render the results dimensionless and then tack on a unit.

Dik

 

[GregLocock]

The constants aren't dimensionless if that is any help.

Cheers

Greg Locock


New here? Try reading these, they might help FAQ731-376

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[dik]

Thanks Greg... would have to introduct coef that rendered the equation as dimensionless and then add one to the end.

Dik

 

[IDS]

Thanks Greg... would have to introduct coef that rendered the equation as dimensionless and then add one to the end.

That's what is discussed in the thread I linked. I don't have time to go through the discussion right now, but there are some alternative procedures in there.

Doug Jenkins
Interactive Design Services

http://newtonexcelbach.wordpress.com/

 

[dik]

That's what is discussed in the thread I linked. I don't have time to go through the discussion right now, but there are some alternative procedures in there.

Yes, went through that thread... good post... and was my original solution... I was just hoping there would be an easier method. SMath, if you run your mouse cursor over the formula, yields the units, and it would be a matter of correcting for these.

Dik

 

[IRstuff]

Sorry, nothing new to add since that thread.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

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[dik]

IRS: Thread was good...

thanks, Dik

 

[dik]

Finally got it to work...

 

[yakpol]

More bulletproof way is to make f'c and γ.c dimensionless using division by MPa and kg/m^3. It will allow to use US or SI units for definitions. Please see attached.

 

[dik]

Yakpol:
Thanks, long time no hear...

Dik