Joint (hwx.inspire.core)

Joint connect parts together while allowing movement at the joint location.

Every joint has a type, such as Pin or Hinge, and state, which can be set to Locked, Active, or Free.

Attributes

active: Bool activeForStaticAnalysis: Bool angle: Double
autoCalculateAllowableForces: Bool axialForce: Double axialStiffness: Double
ballRadius: Double behavior: Enum bendingArm: Double
bristleStiffness: Double c: Double calculateGeometryParams: Bool
color: Color connectionRadius: Double contact: Attribute
ct: Double ctx: Double cty: Double
ctz: Double cx: Double cy: Double
cz: Double dampingCoefficient: Double dynamicCoefficient: Double
effectType: Enum enableAllowableForces: Bool enableFriction: Bool
enableMoment: Bool enablePreload: Bool enablePretension: Bool
enableReaction: Bool enableTorsional: Bool featureLists: Attribute
frictionArm: Double grounded: Bool initialOverlap: Double
k: Double kt: Double ktx: Double
kty: Double ktz: Double kx: Double
ky: Double kz: Double material: Attribute
name: Attribute overlapDelta: Enum pinRadius: Double
preloadForce: Double preloadTorque: Double pretensionForce: Double
rateType: Enum reactionArm: Double shearForce: Double
shearStiffness: Double state: Enum staticCoefficient: Double
stictionTransitionVelocity: Double type: Enum viscousCoefficient: Double
visible: Bool  

Public Methods

classmethod getAllowedTypesFromKeyFeatures (cls, keyFeatures)
classmethod getConnectionCandidates (cls, keyFeatures, holes=None)
getAllowedTypes (self)
setValues (self, **kwds)

Attribute Details

active : Bool

Returns or sets the object activeness.

Setting this on or off sets all children. Setting to True sets all the parents active too.

activeForStaticAnalysis : Bool

Allows the joint to be active, during motion analysis set to static.

angle : Double

Specifies the rotational value about the axis.

autoCalculateAllowableForces : Bool

Determines whether the allowable axial and shear forces will be manually added.

axialForce : Double (units=”force”)

Manually entry of the Allowable Axial Force.

Based on the yield stress and the area of the hole Inspire automatically determines the maximum stress allowed for the fastener or cylindrical hole support, if autoCalculateAllowableForces is set to True.

axialStiffness : Double (units=”stiffness”)

The spring stiffness in the axial direction.

ballRadius : Double

Specifies the radius of the ball joint.

behavior : Enum (Default, Rigid, Flexible)

Specifies the behavior of the joint. It can be Default, Rigid or Flexible.

If value is ‘Default’ then the behavior should be realized off a global default setting.

Flexibility of the joint can be specified using k, kt, c, ct properties.

bendingArm : Double

Specifies the value of the bending moment value of arm.

bristleStiffness : Double

Specifies the bristle stiffness value of the joint friction.

c : Double

Specifies the damping value.

calculateGeometryParams : Bool

Allows to manually enter dimensions for geometry parameters such as the pin radius, friction arm, and bending arm.

color : Color

The color assigned to the connector when it is displayed in the modeling window.

connectionRadius : Double (units=”length”)

The search radius for the connector.

contact : Attribute

Contact object the joint is based on.

If it is None then the joint is hole based.

ct : Double

Specifies the torsional damping value.

ctx : Double

Specifies the torsional damping in the X direction.

cty : Double

Specifies the torsional damping in the Y direction.

ctz : Double

Specifies the torsional damping in the Z direction.

cx : Double

Specifies the damping in the X direction.

cy : Double

Specifies the damping in the Y direction.

cz : Double

Specifies the damping in the Z direction.

dampingCoefficient : Double

Specifies the damping friction coefficient of the joint.

dynamicCoefficient : Double

Specifies the dynamic friction coefficient (?d) of the joint.

effectType : Enum (Stiction and Sliding, Stiction Only, Sliding Only)

Specifies the frictional effect.

The frictional effects can be “Stiction and Sliding”, “Stiction Only” and “Sliding Only”.

By default, both static and dynamic friction are considered. The ‘Stiction Only’ option uses only static friction, while the ‘Sliding Only’ option uses only dynamic friction.

enableAllowableForces : Bool

Determines whether to enable optimization of the selected fasteners or cylindrical hole supports.

enableFriction : Bool

Allows to enable friction between the connected parts.

enableMoment : Bool

Allows to enable the bending moment of the joint.

enablePreload : Bool

Allows to preload value for the joint.

enablePretension : Bool

Determines whether pretension is enabled.

If pretension is enabled and defined, the pretension is then included as a load in all load cases.

enableReaction : Bool

Allows to enable reaction of the joint.

enableTorsional : Bool

Allows to enable the torsional moment of the joint.

featureLists : Attribute

A nested list of features making up the holes.

frictionArm : Double

Specifies the value of the frictional value of arm.

grounded : Bool

Determines whether the connector is grounded.

initialOverlap : Double

Specifies the intial overlap value.

k : Double

Specifies the stiffness value.

kt : Double

Specifies the torsional stiffness value

ktx : Double

Specifies the torsional stiffness in the X direction.

kty : Double

Specifies the torsional stiffness in the Y direction.

ktz : Double

Specifies the torsional stiffness in the Z direction.

kx : Double

Specifies the stiffness in the X direction.

ky : Double

Specifies the stiffness in the Y direction.

kz : Double

Specifies the stiffness in the Z direction.

material : Attribute

The material of the connector.

name : Attribute

Returns or sets the name of the object.

It can be any text string, including spaces, although it’s best to avoid using the following characters: ” ‘ * ? and $.

While these characters are allowed, they could create difficulties when you export the model to other applications.

overlapDelta : Enum (Constant, Increase, Decrease)

Specifies options to how to overlap delta value for friction.

The options can be “Constant”, “Increase”, or “Decrease”.

pinRadius : Double

Specifies the radius of a pin joint.

preloadForce : Double

Specifies the preload force value of the joint.

preloadTorque : Double

Specifies the preload torque value of the joint.

pretensionForce : Double (units=”force”)

The magnitude for the pretension force.

Applying pretension to bolted and screwed connections allows a more complete understanding of the behavior of a structure. Often, these preloads are of a significant magnitude and can influence design decisions.

Typical examples are clamping structures, such as bearing housings or bicycle handlebars and seat-posts. In engines, cylinder bore distortion can be a critical design requirement highly influenced by the loads generated by the bolt down of the cylinder head.

rateType : Enum (Global, Basic, Advanced)

Specifies type of rate used by the joint.

It can be Global, Basic or Advanced Rates.

reactionArm : Double

Specifies the value of the reaction value of arm.

shearForce : Double (units=”force”)

Manually entry of the Allowable Shear Force.

Inspire automatically determines the maximum force allowed for the fastener or cylindrical hole support, if autoCalculateAllowableForces is set to True.

shearStiffness : Double (units=”stiffness”)

The spring stiffness in the shearing direction.

state : Enum (Locked, Active, Free)

Specifies the state of the joint.

It can be set to Locked, Active, or Free.

  • Select Locked to prevent movement in the joint.
  • Select Active to allow the joint to function normally.
  • Select Free if you want the mechanism to behave as if the joint is not there.

staticCoefficient : Double

Specifies the static friction coefficient (?s) of the joint.

stictionTransitionVelocity : Double

Specifies the joint velocity at which the friction effect transitions from dynamic friction to static friction.

type : Enum

The type of the connection.

Call getAllowedTypes to see which are the allowed types.

viscousCoefficient : Double

Specifies the viscous friction coefficient of the joint.

visible : Bool

Determines whether the object is visible in the modeling window.

Setting this on or off sets all children. Setting to True sets all the parents visible too.

Property Details

contactInfo()

Returns a dictionary with contact information of the joint.

hasClip()

Determines whether the joint have a clip preventing translation along the hole axis.

Will be True for Pin based joint types and False for Sliding Pin based joint types. Not applicable for contact based joints.

keyFeatures()

General classification of referenced features by the joint.

It can be

  • Aligned holes
  • Single Holes
  • Cylindrical Pairs
  • Spherical Pairs
  • Planar Pairs
  • Multi-Planar Pairs
  • Unknown Pairs

Method Details

classmethod getAllowedTypesFromKeyFeatures(cls, keyFeatures)

Return a list of valid joint types for a given keyFeatures.

param keyFeatures:
 Filters the contact type based on keyFeatures. Refer keyFeatures property for valid list of keyFeatures.
type keyFeatures:
 str
returns:Allowed types for Joint.
rtype:List
classmethod getConnectionCandidates(cls, keyFeatures, holes=None)

Returns a list of objects that are valid connection candidates to create a joint.

param keyFeatures:
 Filters the contact type based on keyFeatures. Refer keyFeatures property for valid list of keyFeatures.
type keyFeatures:
 str
param holes:List of hole features to find connection candidates.
type holes:Holes, list[list[Feature]]
returns:All valid connection candidates from the key features.
rtype:ConnectionCandidates
getAllowedTypes(self)

Returns a list of allowed realization types of joint.

This is a subset of type depending on the contact.

setValues(self, **kwds)

Sets attribute on name and value pairs in order of attributes defined.