Dynamic Analysis of a Brake System using MotionSolve?

Brian_20847
Brian_20847 Altair Community Member
edited April 4 in Community Q&A

Hi experts,

I want to do the simulation when braking. I am using the Force entity to braking but the pad cannot work.

The results seem not the same as the reality. Please find the attachment to know my model

 

Thanks

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Answers

  • Christopher_Fadanelli
    Christopher_Fadanelli
    Altair Employee
    edited April 1

    Hi Brain,

    The reason why the pads are not moving is due to the configuration of Joint 3 and 4. Since they are fixed to the ground body, they will not move. If you switch the configuration to InPlane joints and have the Orientation set to the Global Y vector. Run simulation, you will be able to see the pads move and come into contact with the rotor.

     

     

    image

    Best,

    Christopher Fadanelli

    Application Engineer - Multibody Dynamics

    Troy, MI

  • Brian_20847
    Brian_20847 Altair Community Member
    edited April 3
    Christopher Fadanelli_22565 said:

    Hi Brain,

    The reason why the pads are not moving is due to the configuration of Joint 3 and 4. Since they are fixed to the ground body, they will not move. If you switch the configuration to InPlane joints and have the Orientation set to the Global Y vector. Run simulation, you will be able to see the pads move and come into contact with the rotor.

     

     

    image

    Best,

    Christopher Fadanelli

    Application Engineer - Multibody Dynamics

    Troy, MI

    Hi @Christopher Fadanelli 

    I tried to change this, but my model cannot converge.

    Thanks

  • Christopher_Fadanelli
    Christopher_Fadanelli
    Altair Employee
    edited April 3
    Brian_20847 said:

    Hi @Christopher Fadanelli 

    I tried to change this, but my model cannot converge.

    Thanks

    Hi Brain,

     

    A few notes. 

    You can update the step sizing. Since you are using 2022.3, go to the run settings -> Advanced Settings and increase the step sizing/tolerance.image

     

    The meshing on the rotor. There is an imprint of the pad on the rotor? The mesh is inconsistent and can lead to unreliable results, I suggest to update the meshing (to be flush and finer) on the flexbody and reimport it. image

     

     

    The pads should be converted to flexbodies to capture deformation. Having rigid bodies penetrate the rotor flexbody can also lead to errors.

    See reference picture below.image

     

    Best,

     

    Christopher Fadanelli

  • Brian_20847
    Brian_20847 Altair Community Member
    edited April 4
    Christopher Fadanelli_22565 said:

    Hi Brain,

     

    A few notes. 

    You can update the step sizing. Since you are using 2022.3, go to the run settings -> Advanced Settings and increase the step sizing/tolerance.image

     

    The meshing on the rotor. There is an imprint of the pad on the rotor? The mesh is inconsistent and can lead to unreliable results, I suggest to update the meshing (to be flush and finer) on the flexbody and reimport it. image

     

     

    The pads should be converted to flexbodies to capture deformation. Having rigid bodies penetrate the rotor flexbody can also lead to errors.

    See reference picture below.image

     

    Best,

     

    Christopher Fadanelli

    Hi @Christopher Fadanelli 

    I want to do a comparison between rigid-to-flex contact and flex-to-flex for this model.

    I used the meshing from the OptiStruct model. I don't see the intersection between the pad and the rotor.

    Thanks

  • Christopher_Fadanelli
    Christopher_Fadanelli
    Altair Employee
    edited April 4
    Brian_20847 said:

    Hi @Christopher Fadanelli 

    I want to do a comparison between rigid-to-flex contact and flex-to-flex for this model.

    I used the meshing from the OptiStruct model. I don't see the intersection between the pad and the rotor.

    Thanks

    Hi Brain,

     

    Sorry I should of been more clear on where the intersection is. During the simulation, the pads will be intersecting into the rotor (not at initialization). This can be a cause of the convergence issue. You can also alter the contact properties too. Is your OptiStruct model from Altair site or internally? If you hide the brake pad you can see the imprint.

     

    Best,

     

    Christopher Fadanelli

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