PJOINT dialog box

Physical Property Table
Name	Sets the name of the PJOINT table
Label	Sets a unique integer for the table. The dialog box automatically displays the next available number. However, you might want to change this if you use a particular series of numbers to identify certain types of tables.

PJOINT tab

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Joint Type	Specifies the type of joint.For a description of each joint type, see Kinematic joints for SOL 402.
Stiffness for Constraint Relaxation
Translational - Constrained DOF	Appears when Joint Type is set to any joint except Inline.Sets the translational stiffness.
Rotational - Constrained DOF	Appears when Joint Type is set to any joint except Inline and Spherical.Sets the rotational stiffness.
Friction
Include Friction	Appears when Joint Type is set to any joint except Fixed.Lets you define options to apply friction to the joint.
Friction Coefficient	Appears when the Include Friction check box is selected.Sets the coefficient to be used in the friction equation. The friction coefficient introduces an additional component to the normal or transverse reaction.
Tightening Force for Friction Calculation	Appears when the Include Friction check box is selected.Sets the tightening force.
Characteristic Length: Radius	Appears when Joint Type is set to Revolute or Spherical, and the Include Friction check box is selected.Sets a characteristic radius of a revolute or a spherical joint. The solver uses the radius to compute the following:The friction forces from the transverse reaction (and a tightening force, FR0, if defined)A moment from the friction force
Characteristic Length: XCharacteristic Length: YCharacteristic Length: Z	Appears when Joint Type is set to Slider, Cylindrical, or Slider-Universal, and the Include Friction check box is selected.Sets characteristic dimensions for the slider, cylindrical, or slider-universal joint. The solver uses these lengths to compute frictional forces that are equivalent to the frictional moments. When you add the characteristic lengths, the friction force is given by:where: is the normal force due to moment around the X-axis and is the normal force due to moments around the Y-axis and the Z-axis.Characteristic lengths for a slider jointFor slider-universal joints, LX=0. For cylindrical joints, only LX is taken into account. Characteristic lengths for a cylindrical joint
Friction Option
Regularization	Specifies how you want the software to regularize friction in the joint. Regularization helps to avoid discontinuities in the friction forces.Stiffness based on DisplacementSmooths the transition when the joint movement changes direction. VelocitySmooths the transition when the velocity nears zero.
Regularization Parameter
Stiffness based on Displacement	Sets the stiffness to modify the static friction law that computes the friction force by taking into account a pre-sliding stiffness.
Velocity	Sets the value to use as the regularized friction coefficient as a function of the sliding velocity. This regularization is ignored during a static analysis. In a dynamic analysis, it introduces viscous effects for small velocities.
Joint Liberation
Liberation Length	Appears when Joint Type is set to Inline, Cylindrical, Slider, or Slider-Universal.Sets a liberation length after which the joint is released. When the distance between nodes reaches the specified value, the constraints of the joint are suppressed and the sliding node is no longer constrained by the joint axis.

PJOINT2 tab

For all joints except Spherical and Fixed, use the options on this tab to set stiffness and damping on the joint.

Stiffness
Appears when Joint Type is set to Revolute, Inline, Slider, Cylindrical, or Slider-Universal.Lets you create a stiffness element that uses one degree of freedom. The spring element applies the following to the unconstrained degree of freedom, depending on the specified joint type:Rotation for a revolute joint.Displacement for the sliders.Spring elementwhere:KR is the elastic stiffness.N1 is the node that represents the element with one degree of freedom.u0 is the initial position or angular position of the joint.Δu is the relative displacement or rotation of the joint.The variable names in the stiffness equation vary depending on the joint type you selected on the PJOINT tab. For each joint type, set values for the following variables:Specify an elastic stiffness.Specify a field that represents the nonlinear force or moment (moment versus angular displacement or force versus displacement).Specify a field for the time-dependent scale factor.
Damping
Appears when Joint Type is set to Revolute, Inline, Slider, Cylindrical, or Slider-Universal.Lets you create a damper element that uses one degree of freedom. The damper element applies the following to the unconstrained degree of freedom, depending on the selected joint type:Rotation for a revolute joint.Displacement for the slider joints.Damper elementwhere:N1 is the node that represents the element with one degree of freedom.u̇ is the velocity or angular velocity of the joint.Δu̇ is the relative velocity or angular velocity of the joint.The variable names in the damping equation vary depending on the joint type you selected on the PJOINT tab. For each joint type, set values for the following variables:Specify the linear damping coefficient.Specify a field that represents the nonlinear damping law (moment versus angular velocity or force versus velocity).Specify a field for the time-dependent scale factor.

Learn more

SOL 402 structural analysis with kinematics

1D connection elements for kinematic joints

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Kinematic joints for SOL 402

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PJOINT dialog box, Simcenter 3D 2021.1 Series

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