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Calculation of the moment of inertia off diagonal terms during the ADAMS/Car Aggregate Mass.

e-ondrej.petergac
Hello,
 
does anybody have an idea how the off diagonal term of the inertia moments are calculated during the aggregate mass calculation in ADAMS/Car?
 
Thanks,
Ondrej
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  • 0
    Different reference marker ?
    What I do when I request the full vehicle values is that I first create a marker on the chassis with the location
    AGGREGATE_MASS( $o_assembly , $o_assembly.ground.origo, "cm_pos")
     
    Then I request the inertias with respect to this newly created marker like
    AGGREGATE_MASS( $o_assembly , (eval($_self.ref_part.object_value.model_cm)), "inertias"))
     
    The other workaround would be to always request values with respect to ground.origo
     
    If I'd doubt the whole calculation I'd apply the aggregate mass stuff to a simple model with a single part/geometry with known values (analytically derived).
     
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  • 0
    Different reference marker ?
    What I do when I request the full vehicle values is that I first create a marker on the chassis with the location
    AGGREGATE_MASS( $o_assembly , $o_assembly.ground.origo, "cm_pos")
     
    Then I request the inertias with respect to this newly created marker like
    AGGREGATE_MASS( $o_assembly , (eval($_self.ref_part.object_value.model_cm)), "inertias"))
     
    The other workaround would be to always request values with respect to ground.origo
     
    If I'd doubt the whole calculation I'd apply the aggregate mass stuff to a simple model with a single part/geometry with known values (analytically derived).
     
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