SMath Studio - Units
3

Question

SMath Studio - Units

dik (Structural)

(OP)

28 Feb 18 14:51

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 (Mechanical) · Answer 1 · 2018-02-28 16:29:36

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

dik (Structural) · Answer 2 · 2018-02-28 16:41:45

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

Dik

IDS (Civil/Environmental) · Answer 3 · 2018-02-28 22:14:00

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 (Structural) · Answer 4 · 2018-02-28 22:27:57

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 (Automotive) · Answer 5 · 2018-02-28 22:41:21

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

Cheers

Greg Locock

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dik (Structural) · Answer 6 · 2018-02-28 23:11:30

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

Dik

IDS (Civil/Environmental) · Answer 7 · 2018-03-01 00:26:20

Quote:
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 (Structural) · Answer 8 · 2018-03-01 01:02:21

Quote (IDS)
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 (Aerospace) · Answer 9 · 2018-03-01 05:11:33

Sorry, nothing new to add since that thread.

TTFN (ta ta for now)
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dik (Structural) · Answer 10 · 2018-03-01 13:54:58

IRS: Thread was good...

thanks, Dik

dik (Structural) · Answer 11 · 2018-03-01 15:42:49

Finally got it to work...

http://files.engineering.com/getfile.aspx?folder=bcd2a6dc-88e3-4d35-8a33-3d

yakpol (Structural) · Answer 12 · 2018-03-09 22:05:58

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 (Structural) · Answer 13 · 2018-03-09 23:44:36

Yakpol:
Thanks, long time no hear...

Dik

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SMath Studio - Units
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