Simcenter 3D Motion to Simcenter Amesim interface

workflow

Unlike with a coupled simulation, the co-simulation solves the Simcenter Amesim equations and the Simcenter 3D Motion state equations separately. This is done in a co-simulation mode where each solver is running and communicating with the other solver at discrete intervals in time, usually the communication interval is around a millisecond. The same equations in (4-6) are solved in the co-simulation mode as in the coupled simulation, but separately. In this situation the master solver is the one in the software from which the simulation is started. The Simcenter Amesim solver solves its own set of state equations from the current time ( ti) to the time at the next communication interval ( ti+1). Equation (6) now becomes equation (12) where the Simcenter 3D Motion variable inputs (q, v) are still at the last sample time.

(12)

Once the Simcenter Amesim solver has finished integrating to the next communication interval the Simcenter 3D Motion solver is called and told to integrate to the current time. The Simcenter 3D Motion solver now uses the Simcenter Amesim inputs at the last communication interval to move forward to the next communication interval.

(13)

(14)

Figure 14: Flow of the Simcenter Amesim - Simcenter 3D Motion Co-Simulation Solution Process (Motion as Master)

When setting Simcenter 3D Motion as Master solver, the modeling procedure is basically the same between the coupled simulation and the co-simulation: the only difference is that in the Simcenter Amesim interface block the option Simcenter 3D Motion must be selected.

Figure 15: Define actuator and sensor channels

By creating the Mechatronics interface element in Simcenter 3D Motion, when importing the Simcenter Amesim model the different type of interface (Simcenter 3D Motion Cosim) is detected: this will automatically set the Integration Type to Co-Simulation. Some additional parameters will be then available for the Communication Interval:

• Type: Constant or Variable

• Value (only for Constant type)

Figure 16: Simcenter 3D Motion Mechatronics interface (Input Ports tab)