hexagon logo
Register Sign in
  • State Verified Answer
  • Replies 7 replies
  • Subscribers 7 subscribers
  • Views 186 views
  • Users 0 members are here
Options
Related

Results in post/processor

jozef.bucha
Hello,
 
How are results organized in Adams/PostProcessor ? It looks like to me if several request use same result set name then request is not in result container, i.e. roll_center_location is not in testrig (result container), If just one request like i.e. camber angle uses one result set name, then it is in results set container.
 
Is my observation correct, or there is some other logic behind organization of requests in processor?
 
Thanks in advance
 
Jozef
  • 0
    That is not the whole truth, but is pointing you in the right direction.
    Of the result set name is different from the request name, then it is not in the result container.
  • 0
    Thanks Jslat for response, now i got it. It will be nice if there will be possible sometimes in future to define used container results manualy so requests will be organised. Now it is especially for new users weird, that all requests from mdi_suspension_testrig are in one container, except few which are somewhere else
    At least I can say why are not there
    ​
    Jozef​
  • 0
    Another question which is unclear for me are some request results from mdi_suspension_testrig, i.e. Ackerman request. Is there any reason why is left and right. It should be computed as Ackerman = Right steer angle – Left steer angle, so there should be only one value and left and right request is always producing same result.
     
    Also this definition in help is unclear. Ackerman is the difference between the left and right wheel steer angles. A positive Ackerman indicates that the right wheel is being steered more to the right than to the left.
     
    Jozef
     
     
  • 0
    It is a possibility to have a non-symmetric front suspension. And non-symmetric steering is not uncommon on heavy vehicles with Pitman arm steering. Maybe that is the reason?
  • 0
    So i tried to make example of nonsymetric suspension with steering as possible
    ass_non_symmetric
    The results of ackerman request values are always same for left and right components. I am starting to believe that both components are giving same results.
    non_symetric_ackerman
    So the help is correct about method of computation ackerman = Right steer angle – Left steer angle, AFAIK better will be there only one component ackerman, so it will not be confusing as now.
    non_symetric_ackerman2
    Jozef
  • 0
    I believe that same goes with turn radius, both of them AFAIK give same results
     
    According help:
     
    Description
    The turn radius is the distance measured in the ground plane from the vehicle center line to the turn center along the y-axis (see the figure for Ackerman Angle). Turn radius is positive for right turns and negative for left turns.
    Units Length
    Request Names turn_radius.left
    turn_radius.right
    Inputs Steer angle (see Steer Angle)
    Track width
    Wheelbase
    Wheel-center orientations - left and right
     
    Method
    Adams Car determines the inside wheel by checking the sign of the steer angles. It computes turn radius using the inside tire orientation.
    Left turn:
    turn_radius.left = - [Wheel Base (DCOSY/DCOSX) + Track/2]
    Right turn:
    turn_radius.right = [Wheel Base x (DCOSY/DCOSX) + Track/2]
     
     
    turn_radius
     
    Symmetric vehicle:
    Wheelbase=2000
    W.C._left=0.0, -800.0, 300.0
    W.C._right=0.0, 800.0, 300.0
    Track=1600
     
    Left turn
    plot_5
    plot_7
    For right turn
    plot_6
    plot_8
    Both request components are giving same results.
     
    In Case of non symmetric vehicle
    Non-symmetric vehicle:
    Wheelbase=2000
    W.C._left=0.0, -800.0, 300.0
    W.C._right=0.0, 1100.0, 300.0
    Track=1900
     
    Left turn
    plot_1
    plot_3
    Right turn
    plot_2
    plot_4
     
    What is here little confusing is symmetry plane of vehicle, track is not something like for left wheel 800, for right wheel 1100, but is is using 950 mm for both of them. AFAIK track should be different for left and right wheel.
     
    Also longitudinal non-symmetry of left and right wheel is giving same turn radius results for left and right component.
     
    Jozef
     
     
© 2025 Hexagon AB and/or its subsidiaries. Privacy Policy | Cloud Services Agreement