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Step Function

Posted Sep 1, 2010, 10:59 a.m. EDT Parameters, Variables, & Functions, Studies & Solvers Version 5.1 4 Replies

Pekir Joseph
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Hi:


I want to multiply a voltage source from the electrical interface by a step function to cause a delay, how to go about
that?

Thanks
4 Replies Last Post May 31, 2017, 10:24 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Sep 1, 2010, 5:46 p.m. EDT
Hi

if I understand correctly your demand, I would propose to use the step function in V4 or a Heaviside (check the command.pdf doc) in V3.5 (they are the same in both versions, but they have been further implemented as clickable items in V4)
And then multiply your voltage amplitude by the step function, including a starting point (t-tau) and a rise time "DT" directly in the field where you need to define the voltage. (this applies to any variable by the way, not only to voltages)

--
Good luck
Ivar
Hi if I understand correctly your demand, I would propose to use the step function in V4 or a Heaviside (check the command.pdf doc) in V3.5 (they are the same in both versions, but they have been further implemented as clickable items in V4) And then multiply your voltage amplitude by the step function, including a starting point (t-tau) and a rise time "DT" directly in the field where you need to define the voltage. (this applies to any variable by the way, not only to voltages) -- Good luck Ivar
Amitabh Choudhury
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Posted: 10 years ago Apr 10, 2015, 11:43 a.m. EDT
hi Ivar .. i want to apply lightning impulse voltage of 1.2/50 micro-sec to an electrode under electrostatics module ..plz suggest
hi Ivar .. i want to apply lightning impulse voltage of 1.2/50 micro-sec to an electrode under electrostatics module ..plz suggest
Daniel Connelly
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Posted: 10 years ago Apr 19, 2015, 3:51 p.m. EDT
Can you define it using ":?"? For example,

(t > 3) ? 1 : 0

would be a step going from 0 to 1 starting @ t = 3.
Can you define it using ":?"? For example, (t > 3) ? 1 : 0 would be a step going from 0 to 1 starting @ t = 3.
Sarizan Saaidon
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Posted: 8 years ago May 31, 2017, 10:24 a.m. EDT

hi Ivar .. i want to apply lightning impulse voltage of 1.2/50 micro-sec to an electrode under electrostatics module ..plz suggest


Have you solve the problem?
[QUOTE] hi Ivar .. i want to apply lightning impulse voltage of 1.2/50 micro-sec to an electrode under electrostatics module ..plz suggest [/QUOTE] Have you solve the problem?

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