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How to define BUSHING element in Adams correctly?

Hello, colleagues.
 
I have a question about proper bushing definition in Adams (especially in Car). Probably this issue have already solved many times, but it is still essential for modelling.
 
The question is: what is the right way to define active and reactive bodies in bushing? Some say that one should use the mechanism (say, vehicle suspension) topology and follow through it from part that give an excitation (a wheel, for example) to parts which react on this excitation. Also, there is an idea to consider I/J parts for bushing as inner/outer rings.
 
There is an issue when it comes to bushings with different radial stiffness. When you model such a bushing with different I/J parts order, you receive different results of bushing reaction. This difference may lead to different behaviour of related elements. I suppose it's related with bushing formulation described in the KB8013987 tech article.
 
For instance, there is a toelink, which has a bushing with different radial stiffnesses and a spherical joint. In this case different I/J parts order lead to different rotation of toelink around its axis and to different values of spherical joint working angle.
 
Thanks a lot for the explanation in advance
Parents
  • Hello ,everyone
    Could I follow this question to ask my another related question.
    How about it in the damper/spring/ bump?
    1. damper: we normally choose rod as i part and tube as j part,just like what has done in the acar-template. But the action part (i Part) should be tube in the real and reaction part should be rod. They are contradiction.
    2. spring: for instance with four arm, action part should be arm and reaction should be chassis ?
    3. bump: i pat should be tube and j part should be chassis or rod according to the function and construction of bump?
    all in all ,my rule about i and j part is force flow. But this rule has sometimes contradiction with acar-intern-template for spring/damper/bump.
    could anyone please help, which one is right.
    thanks in avdanced.
     
     
     
Reply
  • Hello ,everyone
    Could I follow this question to ask my another related question.
    How about it in the damper/spring/ bump?
    1. damper: we normally choose rod as i part and tube as j part,just like what has done in the acar-template. But the action part (i Part) should be tube in the real and reaction part should be rod. They are contradiction.
    2. spring: for instance with four arm, action part should be arm and reaction should be chassis ?
    3. bump: i pat should be tube and j part should be chassis or rod according to the function and construction of bump?
    all in all ,my rule about i and j part is force flow. But this rule has sometimes contradiction with acar-intern-template for spring/damper/bump.
    could anyone please help, which one is right.
    thanks in avdanced.
     
     
     
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