Joint Time Constraint boundary condition

Use the Joint Time Constraint boundary condition to free (move) and constrain (stop) kinematic joints. You can use the Joint Time Constraint once per joint. If you need both types of constraints, you must first free the joint, and then constrain it.

• To specify the time at which you want to free or constrain a joint, use one Joint Time Constraint boundary condition.

• To specify the time at which you want to free and then constrain a joint, use two different Joint Time Constraint boundary conditions.

For example, you may want to free a joint after your model is fully loaded. Then, you may want to stop moving it to allow other joints to begin their movements.

Note:

When releasing a constraint, ensure that no rigid body motion is created. To solve this problem, consider adding a spring or damper to the physical property (PJOINT2) of the joint, or performing a dynamic analysis.

You can use the Joint Time Constraint with fixed, revolute, inline, cylindrical, slider, and slider-universal joints.

• For fixed joints, you can keep the joint connected until a specified point in time. You can select any combination of the degrees of freedom to release.

• For revolute, inline, cylindrical, slider, and slider-universal joints, you set the time at which you want the joint to be freed or constrained.

You must coordinate these times with the time increments in your subcases. You can use the Joint Time Constraint at the solution level only.

Requesting output

To request output, create a structural output request for a Joint Result. You select the CJOINT elements for which you want output. You can select force vector and moment vector output, and you can select displacement, angle, velocity, and angular velocity between the kinematic joint nodes.

Where do I find it?

Joint Time Constraint boundary condition

Application	Pre/Post
Prerequisite	Simulation file as the work part and displayed partSimcenter Nastran as the specified solverStructural as the specified analysis typeSOL 402 Multi-Step Nonlinear Kinematics as the specified solution type
Command Finder	Joint Time Constraint
Simulation Navigator	Constraint Container→New Constraint→Joint Time Constraint

Requesting output

Application	Pre/Post
Prerequisite	Simcenter Nastran as the specified solverStructural as the specified analysis typeSOL 402 Multi-Step Nonlinear Kinematics as the specified solution type
Command Finder	Modeling Object
Location in dialog box	Modeling Objects Manager dialog box→Type list→Structural Output Requests→Create→Joint Result page→Enable JRESULTS Request

How do I

Add joints to your kinematics model using universal connections

Create a flexible slider joint

Create and assign control nodes

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SOL 402 structural analysis with kinematics

1D connection elements for kinematic joints

Kinematic Driver boundary condition

Flexible slider joint

Control nodes

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Kinematic joints for SOL 402

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Joint Time Constraint boundary condition, Simcenter 3D 2021.1 Series

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