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The switch part has also influce on the dynamic results ?

zhenhui xu
Hello Everyone,
 
I built two suspension templates. The only one difference is with and without Switch Part.
Meanwhile the topologieplan between them is the same. That means, force or/and joint elemnt connect always between A part and B part.
 
What I can not understand:
1.       There come out the difference of resutls on the dynamic simulation (the results in quasi-static simulation are the same) . On my opionion, the results should be totly the same. Because switch part = part (massloss) + fixed joint.
image
The simulation model can be found in attachment.
 
 
2.       The difference appears not immediately in the beginning of simulation, howeverappare for a while.
image.png
The simulation models are not in attachment.
 
 
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  • 0
    If the model is relatively small, the introduction of switch parts can change the results. Each part that you add to the model contributes with 15 equations, and the fixed joint required for the switch part adds another 6 equations.
    The bigger and more complex the model is, the less addition of a few extra massless parts does not matter, but if it is a small model it can be some difference.
    This tells me that you have not gone through the exercise to set the error and hmax to get robust results.
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  • 0
    If the model is relatively small, the introduction of switch parts can change the results. Each part that you add to the model contributes with 15 equations, and the fixed joint required for the switch part adds another 6 equations.
    The bigger and more complex the model is, the less addition of a few extra massless parts does not matter, but if it is a small model it can be some difference.
    This tells me that you have not gone through the exercise to set the error and hmax to get robust results.
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