Working with Units

#1 Posted: 8/23/2010 7:00:11 PM

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Could I ask if there is a way to choose a preferred unit after the program has calculated it?

For eg. the default unit for force is in Newtons ('N). If we wish for this to be displayed as kiloNewton (ie., kN) - how should I do this?

Thanks.

#2 Posted: 8/23/2010 7:28:23 PM

Andrey Ivashov

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Hello Chin!

From the Units implementation topic:

Best regards, Andrey Ivashov.

#3 Posted: 9/7/2010 1:38:59 PM

matteob8

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"Unit" it's a great feature: they are everywhere in my job

But I've a little issue: how can SMath understand when I want to express a Moment instead of an Energy?
e.i. I need N*m instead Joule J.

Thanks again for this cool software!

#4 Posted: 9/7/2010 3:01:09 PM

Radovan Omorjan

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Hello,

Wrote
But I've a little issue: how can SMath understand when I want to express a Moment instead of an Energy?
e.i. I need N*m instead Joule J.

I did not quite understand, sorry. Do you actually want insted of J every result to give you N*m ?. What's wrong with the explanation Andrey gave in the previous post - with the picture included - how to change the unit of the result?. Just change J into N*m.

You might even define a new, say, Nm unit like
'Nm:='N*'m or 'Nm:='J
and every J unit replace with Nm unit.

Regards,
Radovan

When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!"

#5 Posted: 9/7/2010 4:09:22 PM

matteob8

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Thanks Radovan for the prompt reply!

I know: it's a subtle question.

J and N*m seem equals but they are quite different: the first referes to energy, the second to an applied load.

Maybe the following link could clarify the concept: http://en.wikipedia.org/wiki/Newton_metre

In the above link they suggest to use J/rad as an alternate unit for torque but it seems that doesen't work on SMath.

How can I solve this issue?

Thanks for the patience.

Regards,
Matteo.

#6 Posted: 9/7/2010 4:40:39 PM

maweilian

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A picture is worth a thousand words:

click on the placeholder on the right and press the apostrophe " ' " to insert a unit:

type in "N * m" (use the dynamic help to make sure you are using the predefined units):

that should give you the units you desire:

Will Massie Mechanical Engineer Oregon, USA

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Radovan Omorjan 9/9/2010 10:05:00 AM

#7 Posted: 9/7/2010 6:07:50 PM

matteob8

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Yes! It's what I was looking for!
Thank you Will!

Sorry if bothered you guys, I'd never thought that the solution would be so simple.

Br,
Matteo.

#8 Posted: 9/28/2019 7:17:24 PM

Juan Manuel

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Hello, I would like to consult you

I define a temperature in degrees Centigrade, when I call it it looks like Kelvin degrees and then I can't make a sum because it tells me they are two different units. How can I do so that the defined temperature is maintained in every calculation in the unit that defined it?

Attached image capture of the problem.

Thank you

#9 Posted: 9/29/2019 4:22:37 AM

Radovan Omorjan

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Hello,

There are many posts on the Forum about handling tempereture units. See for example this one.

Regards,
Radovan

When Sisyphus climbed to the top of a hill, they said: "Wrong boulder!"

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frapuano 9/29/2019 8:28:00 AM

#10 Posted: 9/29/2019 7:46:27 AM

Jean Giraud

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Smath Unit System is ISO, °C is not ISO.
Define your user unit.
If user unit is not '1', don't multiply input by user.

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frapuano 9/29/2019 8:28:00 AM

#11 Posted: 9/29/2019 9:37:54 AM

Jean Giraud

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Visit Colebrook, suggestive how to carry Engineering projects.
And recover units in the results. Each project is specific.
Please, feel free to attach your project for more doctoring.