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When importing an external CAD model, a very large number of bodies may be created.
In this case, the analysis is often performed after fixing each body with a fixed joint when each body consists of one part.
However, if there are too many bodies connected by fixed joints, the speed of analysis could be significantly slower.
A model with 164 fixed joints
The attached example model is composed of many small boxes on the BaseBody which is a bigger-sized box.
It takes about 1 minute to analyze this model on the PC using the i7-4790.
One of the ways to reduce the analysis time of this model is to create a single body by using Merge Body function instead of fixing the bodies with fixed joints.
In this case, after merging the small boxes into one body (Body2), it takes less than 1 second to analyze Body2 on the same PC.
If you are unable to watch this video, click the link below.
RecurDyn V8R5 provides another way to improve analysis speed of these models.
You can use the option of ‘Use Sparse Solver for MBD’ ([Model Setting] – [Simulation]) and it allows you to analyze the same model within 6 seconds on the same PC.
In this case, it takes more time for analysis than the case of using Merge function, since numerous bodies have their own fixed joints so that the number of equations increases.
(Instead, the reaction force for each joint is calculated.)
However, if the reaction force of the connection part is not required for the analysis, it is much more advantageous to analyze models by merging multiple bodies into one body.
