Unit error "Hz"

#1 Pubblicato: 02/02/2017 00:16:04

983 apprezzamenti in 6.866 post.

Gruppo: User

"Hz", the SI unit of frequency equates ONE cycle per second.
In my times, ONE cycle was ONE complete revolution.
So, ω:{2*π*'rad}/{8.6*10^4*'s}=7.306*10^{-5}*'Hz incorrect.

Bug 6179 Hz NOT radps.sm (6,54 KiB) scaricato 1332 volta(e).

#2 Pubblicato: 02/02/2017 05:19:35

Davide Carpi

1.443 apprezzamenti in 2.936 post.

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http://en.smath.info/forum/yaf_postst7738_Units-mismatch-bug.aspx

[SS-2395]

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#3 Pubblicato: 02/02/2017 11:04:41

Jean Giraud

983 apprezzamenti in 6.866 post.

Gruppo: User

Thanks Davide for re-threading to the original from "Javier"
There are rights and wrongs in the Smath unit system.
For sure Smath is wrong saying "1 rad/s = 1 Hz"
1 rad/s = 1/2pi Hz
rad/s is a measure,,, Hz is a count.

Jean

#4 Pubblicato: 02/02/2017 12:34:14

Jean Giraud

983 apprezzamenti in 6.866 post.

Gruppo: User

...no more argument about this bug

#5 Pubblicato: 02/02/2017 12:54:55

Martin Kraska

1.361 apprezzamenti in 2.275 post.

Gruppo: Moderator

As stated in [SS-2395], there are just two things that SMath is to blame for at the moment:

- the default unit for dimension 1/time is Hz. This should be 1/s instead. Then the interpretation of what the 1 in the numerator counts (revolutions or radians), is left to the user.
- the angular velocity units are listed in the category "frequency". Should be "angular velocity" of course.

When these things are fixed, SMath won't contribute to the confusion any more. Which doesn't mean that there won't be confusion...

Technische Mechanik mit SMath Studio: https://link.springer.com/book/10.1007/978-3-658-50592-9

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Unit error "Hz" - Unit error "Hz" - Messaggi