Simulink model output heavily dependent on relative tolerance

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Thomas
Thomas 2025-1-14
回答： Fangjun Jiang 2025-1-14
I have a relatively large Simulink model that I am validating using a data set. This model is using the ECEF 6DOF block with only a gravitational force as the input.
I have observed that the Simulink model output varies considerably depending on the relative tolerance selected (ranging from 1e-5 to 1e-12), with the output approaching the data set values as the relative tolerance passes below 1e-10. Decreasing the relative tolerance has a significant negative impact on model runtime, so I would like to keep the relative tolerance at a reasonable value while maintaining accuracy in the model results.
Is a significant variation with changing relative tolerance (below the obvious candidates such as >= 1e-5) expected for a typical Simulink model?

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回答（1 个）

Fangjun Jiang
Fangjun Jiang 2025-1-14
Not typical but is for a stiff system. Choose a stiff solver.
https://www.mathworks.com/help/matlab/math/solve-stiff-odes.html

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