Estimate Damping Coefficient of spring and damper

Altair Forum User
Altair Forum User
Altair Employee
edited May 2023 in Community Q&A

Please tell me how to determine the suitable value of damping coefficient of spring and damper whose value of K & C is unknown

Thanks

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Answers

  • Praful
    Praful
    Altair Employee
    edited June 2018

    Spring stiffness can be estimated from the material properties, diameter and number of coils etc.. Please refer to https://vn.misumi-ec.com/pdf/tech/mech/p2813.pdf

    If the spring is physically present, one can also do some simple physical tests to estimate the stiffness (and damping coefficient too).

    One should note that the damping coefficient of a system depends on the mass attached and the mass of spring itself and the medium in which it operates.

    One can calculate critical damping coefficient of a spring mass system using formula 2*sqrt(k.m).

     

    If one does not have a physical system, for a spring mass system in air, considering damping ratio of 1% which is (C/Cc) is a good initial estimate. One can further tune this damping coefficient to get a better correlation

     

    Regards

    Praful

     

  • draucis
    draucis Altair Community Member
    edited May 2023

    Hello Praful,

    Can you explain the last paragraph where you have mentioned that "damping ratio of 1% which is (C/Cc) is a good initial estimate" can you explain it with an example if possible. Like is there a process in play that you could share ?

    Regards 

    Draucis 

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