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Função ln em famílias

6 ANTWORTEN 6
GELÖST
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Nachricht 1 von 7
alexandredDHM8H
216 Aufrufe, 6 Antworten

Função ln em famílias

Estou precisando realizar uma equação que utiliza ln (logaritmo natural) porém o Revit não está reconhecendo a função e retorna informando que o parâmetro é inválido, como posso utilizar essa função?

Alguém poderia postar um arquivo de família com esta função funcionando

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6 ANTWORTEN 6
Nachricht 2 von 7
RC_RVT
als Antwort auf: alexandredDHM8H

can you upload a screenshot of what you are trying to achieve?

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Nachricht 3 von 7
alexandredDHM8H
als Antwort auf: alexandredDHM8H

 

A equação descrita é : 60*(sqrt(ln(2*Altura do condutor/RC)*ln(2*Altura do condutor/Raio externo do condutor)))

alexandredDHM8H_3-1732637689437.png

 

a euquação que busco resolver seria  

alexandredDHM8H_2-1732637665728.png

 

 

Nachricht 4 von 7
RC_RVT
als Antwort auf: alexandredDHM8H

Try this:

60*(sqrt((ln((2*Conductor Height)/RC))*(ln((2*Conductor Height)/Conductor Outer Radius))))
If this works, please mark it as an accepted solution. This helps make the forum a better place.
Nachricht 5 von 7
alexandredDHM8H
als Antwort auf: alexandredDHM8H

O erro persiste, o ln é reconhecido como parâmetro e não como função logarítmica

alexandredDHM8H_0-1732647295805.png

 

Nachricht 6 von 7
RC_RVT
als Antwort auf: alexandredDHM8H

is it because you are trying to get the square root of a negative number? This seems to be the holdup when I test it my end. I may well be wrong, but just asking.

 

So I have split the formula up so that each section has its own parameter:

 

LN1 = ln((2 * Conductor Height) / RC)
LN2 = ln((2 * Conductor Height) / Conductor Outer Radius)
LN3 = LN1 * LN2
LN4 = 0 - LN3
Square Root Calc = sqrt(LN4)
Square Root Negative = 0 - Square Root Calc
Zs = 60 * Square Root Negative
Zs i = 0 - Zs

 

Not sure if you would need Zs i or not.

 

Does this work for you?

Picture 1.png

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Nachricht 7 von 7
RC_RVT
als Antwort auf: alexandredDHM8H

@alexandredDHM8H did this work for you?

If this works, please mark it as an accepted solution. This helps make the forum a better place.

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