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| 1 | +Connecting Simscape 1-D mechanical models and 3D models in Simscape Multibody. |
| 2 | + |
| 3 | + |
| 4 | +This file contains example models showing how to connect 3D and 1D mechanical models. |
| 5 | +Connecting the models using Simscape Physical Signals ensures a lossless transfer |
| 6 | +of mechanical power between the two systems. This submission contains a library |
| 7 | +that contains the interface blocks (rotational, translational), and example models |
| 8 | +showing how to use them. |
| 9 | + |
| 10 | +You need to ensure that your use of this interface is physically valid. Connecting |
| 11 | +a 3D mechanical model to a 1D mechanical model requires that you follow a few basic |
| 12 | +rules: |
| 13 | + |
| 14 | + |
| 15 | +1. Never add inertia directly to the node on the Simscape side of the interface. |
| 16 | + |
| 17 | + All masses in Simscape models live in an implicit inertial reference frame. A Simscape mechanical |
| 18 | + circuit interfaced to a Simscape Multibody machine in general moves in an accelerated frame. A simulation |
| 19 | + with such a circuit does not include the pseudoforces acting on the Simscape mass and inertia elements |
| 20 | + as experienced in such a noninertial frame and thus violates Newton's second law of mechanics. |
| 21 | + |
| 22 | +2. If you must model inertia in the Simscape network, connect it to the interface element |
| 23 | + via a spring and damper connected in parallel. Be aware that a Simscape circuit does not model |
| 24 | + the motion of such bodies along or about axes orthogonal to the coupled primitive axis chosen |
| 25 | + in the interfaced Joint. |
| 26 | + |
| 27 | +3. Quantities sensed in Simscape (like translation at a node) may be offset from comparable quantities |
| 28 | + measured in Simscape Multibody. This is because the initial position of the Simscape Multibody joint, |
| 29 | + which is determined during the assembly process, is not automatically conveyed to the Simscape network. |
| 30 | + Once you know this value (after updating the diagram), you can enter it into the Simscape network. |
| 31 | + |
| 32 | + |
| 33 | + |
| 34 | +Copyright 2013-2016 The MathWorks, Inc. |
| 35 | + |
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