Problem with 4 poster, ride simulation

Altair Forum User
Altair Forum User
Altair Employee
edited October 2020 in Community Q&A

Hi, 

 

i've done a full car model of our FSAE car (i literally copied the kinematics and compliance template and adapt it to my car) in order to do the ride analysis but i have some trouble with the model especially i can't control the vertical movement of the jack and i'm not able to the forms. Could someone control my model?

Thank you so much and have a nice day,

Carlo Silini.

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Answers

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    Hi,

     

    Can you please share the log file.

     

    please check the attachments, etc... 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    Thank you so much, i've just solved that problem. I've remade the all model and now it works. Now i've another question, i've a points defined function which i want to insert as a jack input. How can i do?

     

     

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018
    Altair Forum User said:

    i've a points defined function which i want to insert as a jack input. How can i do?

    HI,

     

    What is the use of this function in your model?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    Hi,

    i need to simulate an exponential sweep as shown in the figure. in order to determine the eigenfrequencies of the car. Especially i want to make a model that could be represent my university's 4 posterrig. I saw that the Kinematics and compliance model use the force to determine the movement of the jack. Could i impose the vertical displacement of the jack with that function?

    Thank you so much and have a nice day,

    Carlo.

    image.png.1bc3f24b723f1285e306d19b686edd92.png

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    Yes,  You can either create an expression or use a curve and impose the same on the translational joint which enforces jack movement. 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    Ok thank you Prakash. I've already create the curve but when i insert the reference of the curve in the jack actuation - force the system want to insert a indipendent variable that i don't know how is it.

    <?xml version="1.0" encoding="UTF-8"?>image.thumb.png.62905d3e22ebfbe5eb2864365717ab20.png

      <?xml version="1.0" encoding="UTF-8"?>image.thumb.png.ea45d34c7692c1e606aed31375a0ac22.png

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018
    Altair Forum User said:

    Ok thank you Prakash. I've already create the curve but when i insert the reference of the curve in the jack actuation - force the system want to insert a indipendent variable that i don't know how is it.

    <?xml version="1.0" encoding="UTF-8"?>image.thumb.png.62905d3e22ebfbe5eb2864365717ab20.png

      <?xml version="1.0" encoding="UTF-8"?>image.thumb.png.ea45d34c7692c1e606aed31375a0ac22.png

    Sorry Prakash, how can i fixed my problem with that graph?

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    HI,

     

    Sorry for a late reply.

     

    What is the Y-axis variable in your curve?

     

    Usually Independent variable is your X-axis variable. If your X-axis is TIME, then your Independent variable is TIME. 

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    no problem! Yes, time is on the x-axis. Need i create another variable called time? if yes, how i have to proceed?

    Thank you

  • Altair Forum User
    Altair Forum User
    Altair Employee
    edited February 2018

    HI,

     

    Not required. 

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