ObjectContactCoordinate

A penalty-based contact condition for one coordinate; the contact gap \(g\) is defined as \(g=marker.value[1]- marker.value[0] - offset\); the contact force \(f_c\) is zero for \(gap>0\) and otherwise computed from \(f_c = g*contactStiffness + \dot g*contactDamping\); during Newton iterations, the contact force is actived only, if \(dataCoordinate[0] <= 0\); dataCoordinate is set equal to gap in nonlinear iterations, but not modified in Newton iterations.

Additional information for ObjectContactCoordinate:

  • This Object has/provides the following types = Connector
  • Requested Marker type = Coordinate
  • Requested Node type = GenericData

The item ObjectContactCoordinate with type = ‘ContactCoordinate’ has the following parameters:

  • name [type = String, default = ‘’]:
    connector’s unique name
  • markerNumbers [type = ArrayMarkerIndex, default = [ invalid [-1], invalid [-1] ]]:
    markers define contact gap
  • nodeNumber [type = NodeIndex, default = invalid (-1)]:
    node number of a NodeGenericData for 1 dataCoordinate (used for active set strategy ==> holds the gap of the last discontinuous iteration)
  • contactStiffness [type = UReal, default = 0.]:
    contact (penalty) stiffness [SI:N/m]; acts only upon penetration
  • contactDamping [type = UReal, default = 0.]:
    contact damping [SI:N/(m s)]; acts only upon penetration
  • offset [type = Real, default = 0.]:
    offset [SI:m] of contact
  • activeConnector [type = Bool, default = True]:
    flag, which determines, if the connector is active; used to deactivate (temporarily) a connector or constraint
  • visualization [type = VObjectContactCoordinate]:
    parameters for visualization of item

The item VObjectContactCoordinate has the following parameters:

  • show [type = Bool, default = True]:
    set true, if item is shown in visualization and false if it is not shown
  • drawSize [type = float, default = -1.]:
    drawing size = diameter of spring; size == -1.f means that default connector size is used
  • color [type = Float4, default = [-1.,-1.,-1.,-1.]]:
    RGBA connector color; if R==-1, use default color

DESCRIPTION of ObjectContactCoordinate

Relevant Examples and TestModels with weblink:

The web version may not be complete. For details, consider also the Exudyn PDF documentation : theDoc.pdf