Time constant. Transient thermal analysis

Jaime Maraví
Jaime Maraví New Altair Community Member
edited June 2022 in Community Q&A

Hi, I don´t understand what the time constants in trasient thermal analysis mean. Does "mn" stand for the amount of "minutes" the motor takes to reach the steady state?

If so, there´s something I don´t understand. If you see the attached graph, time constant for the frame is around 12min which is around 700s. But if you look at the temperature vs time graph, temperature at that time is of around 216C and keeps increasing. This means the frame has not yet reached the steady state. Does anybody have any experience with this?

Thanks for your help. 

Jaim

 

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Answers

  • C_Favre
    C_Favre
    Altair Employee
    edited June 2022

    Hi Jaime,

    We use for the time constant (tau) the classical definition, it is the time (in minutes) when the temperature reach 63% of the final temperature.

    I hope this helps.

    Best regards.

    Cyril favre

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