solver specific

Naresh_20479
Naresh_20479 Altair Community Member
edited August 9 in Community Q&A

Hi 

I am using OptiStruct.

I am doing an analysis on rotor part of an alternator. I considered the parts of interest (two parts with slide contact) without shaft. I generally use RFORCE for simulating centrifugal forces under constant rotation. 

But in this case, I want to simulate the case where the RPM varies with time. I am doing nonlinear direct transient analysis by applying varying RPM by TLOAD1 (RFORCE is selected as EXCITED, TABLED1 is selected at TID). 

 

 My case involves contact non linearity. and i want to apply time varying RPM (RFORCE). Is there any other way out doing this?

Is it possible to do this in nonlinear static analysis rather than going to nonlinear Transient analysis?

 

 

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Answers

  • Rajashri_Saha
    Rajashri_Saha
    Altair Employee
    edited August 7

    Hi Naresh,

    Your approach is correct. As time is involved, you should do NL transient analysis.

    Thanks

    Rajashri

  • Naresh_20479
    Naresh_20479 Altair Community Member
    edited August 9
    Rajashri Saha_20525 said:

    Hi Naresh,

    Your approach is correct. As time is involved, you should do NL transient analysis.

    Thanks

    Rajashri

    But the RFORCE calculates force by squaring Omega (obtained from RPM of RFORCE).

    And when you combine RFORCE wit TLOAD i dont think so it calculates a nonlinear force It just scales the RFORCE by the by the curve mentioned in TID.

    I wonder just to simulate a varying RPM why the solution method is so complex. Is there any other way to simulate a varying RPM.

    Has any body analysed stresses due to centrifugal forces under varying RPM? 

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