TorsionSpring (hwx.inspire.motion)#

class TorsionSpring(self, connection=None, **kwds)#

Bases: MotionConnector

Creates a Torsion Spring.

Torsion Springs are used to apply a rotational spring-damper force about the pivot axis for two parts. Torsion Springs provide a angular resistance and/or damping between two objects.

Changing any one of preload, installedLength, freeLength, or k will influence the other values:

Changing preload modifies freeLength.

Changing installedLength, k, or freeLength modifies preload.

Attribute Table#
Name	Type
`axleConnection`	`Reference`
`axleDirection`	`Direction`
`axleLocation`	`Location`
`centerlineJoint`	`Enum`
`coilColor`	`Color`
`coils`	`Int`
`connectorMode`	`str`
`ct`	`Double`
`ctlinear`	`Bool`
`ctspline`	`Spline`
`ctsplineMethod`	`Enum`
`damperColor`	`Color`
`diameter`	`Double`
`direction`	`Direction`
`entity1`	`Reference`
`entity2`	`Reference`
`factor`	`Double`
`freeAngle`	`Double`
`hasDamper`	`property`
`hasSpring`	`property`
`icon`	`str`
`installedAngle`	`Double`
`joint`	`Reference`
`kt`	`Double`
`ktlinear`	`Bool`
`ktspline`	`Spline`
`ktsplineMethod`	`Enum`
`location1`	`Location`
`locked`	`Bool`
`mountConnection`	`Reference`
`preload`	`Double`
`restrainCenterline`	`Bool`
`reverseDirection`	`Bool`
`solverVariables`	`property`
`type`	`Enum`
`wireDiameter`	`Double`

Method Table#
Name	Description
`getArmEnds` (self, local=False, offset=1)	Get end points of wire arms.
`getArmLength_M` (self)	Returns the distance down the arm for the drag point manipulator.
`getInstalledArmPosition_M` (self)	Returns a Matrix44 with an origin at the installed arm end closes to
`getMountArmPosition_M` (self)	Returns a Matrix44 with an origin at the mount arm end closes to
`isValidConnection` (connection)	Determines if the torsion spring can be created from the Joint.

Example

from hwx import inspire
from hwx.inspire import motion

model = inspire.openTutorialFile("Motion/M01_FourBar.x_t")
axleFt = model.getChild('Link Crank').features[26]
mountFt = model.getChild('Assembly-Base').getChild('Mount Crank').features[102]
mountFt.part.ground = True

spring = motion.TorsionSpring(
   axleConnection     = axleFt,
   axleLocation       = (.5, .5),
   mountConnection    = mountFt,
   installedAngle     = 90,
   ct                 = 1e-4,
   restrainCenterline = True
)
print("spring.preload", spring.preload.guiValue)

# Hide irrelevant parts
for part in set(model.parts) - set(spring.getReferences()):
   part.active = False

inspire.fitView()

property type#

Specifies the type of Torsion Spring.

Torsion Spring can be of type Spring Damper or only Spring or Damper, defaults to Spring Damper.

property restrainCenterline#: When enabled, the pivot axis of the torsion spring is restrained to essentially create a cylindrical or revolute joint between the parts.

property centerlineJoint#: Specifies what type of joint to be created if Restrain Centerline is enabled.

property locked#: If True, prevents the spring from exerting exert a torque during Motion Analysis.

property kt#: The torsional stiffness rate of the spring, defaults to 0.1 N*m/rad.

property ktlinear#: Enables linear stiffness with the value specified for property kt, else uses interpolation methods to get stiffness value.

property ktsplineMethod#

Specifies the type of interpolation method to use.

Types can be Akima, Cubic or Linear.

property ct#: The torsional damping rate of the spring, defaults to 0.001 N*m*s/rad

property ctlinear#: Enables linear damping with the value specified for property ct, else uses interpolation methods to get damping value.

property ctsplineMethod#

Specifies the type of interpolation method to use.

Types can be Akima, Cubic or Linear.

property preload#: Specifies the torsional force applied to the spring to reach its free angle.This property is auto computed based on the free angle and the torsional stiffness.

property installedAngle#: The angle of the spring as installed in the mechanism, defaults to 0 deg.

property freeAngle#: The angle of the spring in its resting state, defaults to 0 deg.

property reverseDirection#: Reverses the direction of the preload torque in the spring.

property entity1#: Specifies the feature or Joint where the torsion spring axle is attached to.

property location1#: The location of the torsion spring wrt to axle connection.

property direction#: The direction of the torsion spring wrt to axle connection.

property entity2#: Specifies the feature or Joint where the torsion spring mount is attached to.

property axleConnection#: Specifies the feature or Joint where the torsion spring axle is attached to.

property axleLocation#: The location of the torsion spring wrt to axle connection.

property axleDirection#: The direction of the torsion spring wrt to axle connection.

property mountConnection#: Specifies the feature or Joint where the torsion spring mount is attached to.

property factor#: Used to update the length of torsion spring axis on basis of its radius.

property coils#

Number of coils in the spring, defaults to 5.

This is not specifiable if the spring is of type Damper.

property coilColor#: Specifies the color of the coils around the spring.

property damperColor#: Specifies the color of the damper of the spring.

property diameter#: Used to change the diameter of the torsion spring.

property wireDiameter#: Use to change the wire diameter of the torsion spring.

property hasSpring#: Specifies if the torsion spring has any springs.

property hasDamper#: Specifies if the torsion spring has any dampers.

getArmEnds(local=False, offset=1)#

Get end points of wire arms.

Parameters:

local (bool) – If set to True, returns the end points of the arm wrt to local space, otherwise in-terms of global torsion spring position.
offset (float) – offset can be passed to get point a little past arm ends which is useful for manipulators.

Returns:

The end points of the torsion spring arms.

Return type:

(math.Point, math.Point)

getMountArmPosition_M()#: Returns a Matrix44 with an origin at the mount arm end closes to the spring, and the z aligin with the other end.

getInstalledArmPosition_M()#: Returns a Matrix44 with an origin at the installed arm end closes to the spring, and the z aligin with the other end.

getArmLength_M()#: Returns the distance down the arm for the drag point manipulator.