This feature is a co-simulation link (transient-transient) between Twin Builder and the Ansys Rigid Dynamics solver. This link enables you to combine detailed rigid mechanics models with system models such as complex electronic semiconductor device models used in controls. You can export a rigid dynamics sub-circuit and perform an analysis of the structure in Twin Builder.
Note: You can also perform an FMU co-simulation with an external tool (co-simulation primary). For more details about the FMI standard and tools that support co-simulation with FMU, see fmi-standard.org. You set up an FMU co-simulation in the same manner as described here for a Twin Builder co-simulation.
Twin Builder and rigid dynamics models are connected by Co-Simulation Pins.
Simulation is driven by Twin Builder.
Results can be reviewed in Twin Builder, and then imported back to Ansys Mechanical.
Preparing the Analysis
Create a Rigid Dynamics Analysis System
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Define Engineering Data
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Density is the only material property utilized in a rigid dynamics analysis. Models that use zero or nearly zero density fail to solve using the Ansys Rigid Dynamics solver.
Attach Geometry
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Only sheet and solid bodies are supported by the Ansys Rigid Dynamics solver. Plane bodies and line bodies cannot be used.
Define Part Behavior
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You can define a Point Mass for this analysis type. Part stiffness behavior is not required for the Ansys Rigid Dynamics solver in Ansys Workbench.
Define Joints and Springs
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Applicable connections for this type of analysis are joints or springs.
When an assembly is imported from a CAD system, joints and constraints are not imported; however, joints can be created automatically or manually after the model has been imported.
Each joint is defined by its coordinate system of reference. The orientation of this coordinate system is essential, as free and fixed degrees of freedom are defined in this coordinate system.
Define Input and Output Pins
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The quantities that are driven by Twin Builder are defined as input pins. The quantities that are monitored by Twin Builder are defined as output pins.
Define Analysis Settings
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Some of the analysis settings might be overwritten by those defined in Twin Builder, because Twin Builder drives the co-simulation.