Model.alternatejointcreate

Model.alternatejointcreate(type, n1, n2, orient1_x, orient1_y, orient1_z, orient2_x, orient2_y, orient2_z, orient1_node=Entity(), orient2_node=Entity(), set1=Entity(), set2=Entity())

Creates a joint element that corresponds to a JOINT, MBPTCV, MBCVCV, MBPTDCV or MBPTDSF card.

Parameters:

• type (int) –

  Joint element type. Supported values are:

  8 - Ball

  9 - Fixed

  10 - Revolute

  11 - Translational

  12 - Cylindrical

  13 - Universal

  14 - Constant velocity

  15 - Planar

  16 - Inline

  17 - Perpendicular

  18 - Parallel axes

  19 - Inplane

  20 - Orient

  21 - Point to Curve

  22 - Curve to Curve

  23 - Point to Deformable Curve

  24 - Point to Deformable Surface

• n1 (Entity) – The object describing the first node entity of the joint element.

• n2 (Entity) – The object describing the second node entity of the joint element.

• orient1_x (double) – x-coordinate defining the first orientation vector.

• orient1_y (double) – y-coordinate defining the first orientation vector.

• orient1_z (double) – z-coordinate defining the first orientation vector.

• orient2_x (double) – x-coordinate defining the second orientation vector.

• orient2_y (double) – y-coordinate defining the second orientation vector.

• orient2_z (double) – z-coordinate defining the second orientation vector.

• orient1_node (Entity) – The first orientation node entity of the joint element.

• orient2_node (Entity) – The second orientation node entity of the joint element.

• set1 (Entity) – The object describing the first entity set used to define the MBD curve.

• set2 (Entity) – The object describing the second entity set used to define the MBD curve.

Note

All joint elements, except those with type=23 or type=24, require both n1 and n2 to be valid (nodes with non-zero IDs). For joints that are either of those two types, n2 may be specified as None. In addition, for those types, this function will always set n2 to be equal to n1.

Example

Create a fixed joint connect nodes with IDs 10 and 25

import hm
import hm.entities as ent

model = hm.Model()

model.alternatejointcreate(
    type=9,
    n1=ent.Node(model, 10),
    n2=ent.Node(model, 25),
    orient1_x=0.0,
    orient1_y=0.0,
    orient1_z=0.0,
    orient2_x=0.0,
    orient2_y=0.0,
    orient2_z=0.0,
)

Create an inline joint connect nodes with IDs 20 and 100 , use node with ID 50 as the first orientation node

import hm
import hm.entities as ent

model = hm.Model()

model.alternatejointcreate(
    type=16,
    n1=ent.Node(model, 20),
    n2=ent.Node(model, 100),
    orient1_x=0.0,
    orient1_y=0.0,
    orient1_z=0.0,
    orient2_x=0.0,
    orient2_y=0.0,
    orient2_z=0.0,
    orient1_node=ent.Node(model, 50),
)

Create a point to curve joint element connect nodes with IDs 15 and 16 , use a MBD curve defined by an entity set of ID 4

import hm
import hm.entities as ent

model = hm.Model()

model.alternatejointcreate(
    type=21,
    n1=ent.Node(model, 15),
    n2=ent.Node(model, 16),
    orient1_x=0.0,
    orient1_y=0.0,
    orient1_z=0.0,
    orient2_x=0.0,
    orient2_y=0.0,
    orient2_z=0.0,
    set1=ent.Set(model, 4),
)