Editing Road in Altair MotionView

Azriel Hosea
Azriel Hosea Altair Community Member
edited August 6 in Community Q&A

How to set elevation angle at Constant Radius in Altair MotionView?

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Answers

  • GTT Adam
    GTT Adam
    Altair Employee
    edited May 14

    Hi Azriel.

    Are you trying to complete the constant radius event with banked corners, or going up/down a hill?

     

    To bank, you will have to use a 3D Spline Road RDF file. As detailed in the help documentation (https://help.altair.com/hwdesktop/hwx/topics/motionview/road_tools_roads_3d_spline_r.htm?zoom_highlight=bank), a global parameter for bank angle can be set:

    image

     

    To change the road elevation angle, you will have to rotate the road reference marker to the desired angle. The initialization may be more difficult, however the event can still be completed:

    image

     

    Thanks,

    Adam Reid

  • Samtuck11
    Samtuck11 Altair Community Member
    edited May 21
    Adam Reid_21142 said:

    Hi Azriel.

    Are you trying to complete the constant radius event with banked corners, or going up/down a hill?

     

    To bank, you will have to use a 3D Spline Road RDF file. As detailed in the help documentation (https://help.altair.com/hwdesktop/hwx/topics/motionview/road_tools_roads_3d_spline_r.htm?zoom_highlight=bank), a global parameter for bank angle can be set:

    image

     

    To change the road elevation angle, you will have to rotate the road reference marker to the desired angle. The initialization may be more difficult, however the event can still be completed:

    image

     

    Thanks,

    Adam Reid

    Adam, I am trying to do something similar here, I am trying to run a slalom course but on a side slope, I have rotated the road reference marker like mentioned above. The vehicle is positioned like its on a flat road in motion view but when I run the simulation it seems as if the vehicle starts in an awkward orientation and gets thrown onto the side slope. Do you know how to get the vehicle to start on the slope?  See below:

    image

    Thanks,

     

    Sam

  • Chris Coker_20903
    Chris Coker_20903 Altair Community Member
    edited May 21
    Adam Reid_21142 said:

    Hi Azriel.

    Are you trying to complete the constant radius event with banked corners, or going up/down a hill?

     

    To bank, you will have to use a 3D Spline Road RDF file. As detailed in the help documentation (https://help.altair.com/hwdesktop/hwx/topics/motionview/road_tools_roads_3d_spline_r.htm?zoom_highlight=bank), a global parameter for bank angle can be set:

    image

     

    To change the road elevation angle, you will have to rotate the road reference marker to the desired angle. The initialization may be more difficult, however the event can still be completed:

    image

     

    Thanks,

    Adam Reid

    If you just need everything at an incline, changing the gravity vector is another way to go about this.  Too large of a gravity vector change can sometime lead initial static eq issues.

  • Samtuck11
    Samtuck11 Altair Community Member
    edited May 21
    Chris Coker_20903 said:

    If you just need everything at an incline, changing the gravity vector is another way to go about this.  Too large of a gravity vector change can sometime lead initial static eq issues.

    Thanks for the reply Chris, I have thought about this but I was trying to save changing the gravity vector as a last ditch effort. I would prefer to just tilt the road if possible. 

  • GTT Adam
    GTT Adam
    Altair Employee
    edited May 21
    Sam Tucker said:

    Adam, I am trying to do something similar here, I am trying to run a slalom course but on a side slope, I have rotated the road reference marker like mentioned above. The vehicle is positioned like its on a flat road in motion view but when I run the simulation it seems as if the vehicle starts in an awkward orientation and gets thrown onto the side slope. Do you know how to get the vehicle to start on the slope?  See below:

    image

    Thanks,

     

    Sam

    Hi Sam,

    Chris is correct in that the tilted gravity vector is all that is usually required to simulate such a side slope. However, if this event is desired to leave gravity alone, you can always rotate the vehicle along with the road marker to the desired angle.

    It is likely initializing roughly due to the fact the road intersects the tire by a large amount at initialization. Tilting both the vehicle and marker will mean there will be no intersection during the static portion of the simulation.

    Hope this helps!

    Adam Reid

  • Chris Coker_20903
    Chris Coker_20903 Altair Community Member
    edited May 21
    Sam Tucker said:

    Thanks for the reply Chris, I have thought about this but I was trying to save changing the gravity vector as a last ditch effort. I would prefer to just tilt the road if possible. 

    Just tilting the road by itself, without also tilting the vehicle by the same amount would lead to (at best) unpredictable results, not to mention this would be a rather complicated undertaking. I'm kind of impressed the solver was actually able to get an initial solution.

    The other thing I've done, is to start the road on a flat surface, and then drive it up onto slope.  This does, however require you to utilize a 3D road of some sort.

  • Samtuck11
    Samtuck11 Altair Community Member
    edited May 21

    Thanks Adam and Chris, It sounds like I will just have to go with adjusting gravity to keep myself sane. 

  • Azriel Hosea
    Azriel Hosea Altair Community Member
    edited August 1
    Adam Reid_21142 said:

    Hi Azriel.

    Are you trying to complete the constant radius event with banked corners, or going up/down a hill?

     

    To bank, you will have to use a 3D Spline Road RDF file. As detailed in the help documentation (https://help.altair.com/hwdesktop/hwx/topics/motionview/road_tools_roads_3d_spline_r.htm?zoom_highlight=bank), a global parameter for bank angle can be set:

    image

     

    To change the road elevation angle, you will have to rotate the road reference marker to the desired angle. The initialization may be more difficult, however the event can still be completed:

    image

     

    Thanks,

    Adam Reid

    Sorry, this is my first time using this software, how can I use 3D spline road RDF file?

    Thanks, Adam
  • GTT Adam
    GTT Adam
    Altair Employee
    edited August 6
    Azriel Hosea said:

    Sorry, this is my first time using this software, how can I use 3D spline road RDF file?

    Thanks, Adam

    Hi Azriel,

    A RDF, or Road Data File, is a standard road file format for defining what your AutoTire entities will interact with. They are assigned in the AutoTire definition as well as the Event definitions:

    AutoTire Properties:

    image

    Default road files can be found in your installation directory to use as needed:

    C:\Program Files\Altair\2024\hwdesktop\hw\mdl\autoentities\properties\Tires\ALTAIR_ROADS

    Please review the available road files to become more comfortable with the different types and applications.

    The 3D Spline road is a type of road that allows for higher definition of roads. More on 3D Spline roads can be found in our help documentation here:

    https://help.altair.com/hwdesktop/hwx/topics/motionview/road_tools_roads_3d_spline_r.htm?zoom_highlight=rdf

     

    These types of topics, and more, are all covered in our MotionSolve for Vehicle Modeling eLearning, available at the following link:

    https://learn.altair.com/enrol/index.php?id=497

     

    We also offer an introduction course, MotionView/MotionSolve Introduction eLearning, available at the following link:

    https://learn.altair.com/enrol/index.php?id=496

     

    Hope this helps!

    Adam Reid

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