rigid spring

Module: solid

Category: nlconstraint

Type string: "rigid spring"

Parameters

Name	Description	Default	Units
body_a	body_a	-842150451	[]
body_b	body_b	-842150451	[]
k	k	1	[]
insertion_a	insertion_a	{0,0,0}	[]
insertion_b	insertion_b	{0,0,0}	[]
free_length	free_length	0	[]

Description

The rigid spring applies a linear spring that connects two rigid bodies \(a\) and \(b\) at arbitrary points (not necessarily nodes).

If the free_length parameter is zero, then the initial length of the spring, as defined by the two insertion points, is taken as the free length.

Example:

<rigid_connector type="rigid spring">
  <body_a>1</body_a>
  <body_b>2</body_b>
  <insertion_a>0,0,1</insertion_a>
  <insertion_b>0,0,3</insertion_b>
  <k>1</k>
</rigid_connector>