During simulation of mathematical model occuring following error

Derivative of state '1' in block 'Model/Integrator1' at time 161.23669481078912 is not finite. The simulation will be stopped. There may be a singularity in the solution. If not, try reducing the step size (either by reducing the fixed step size or by tightening the error tolerances)

Answer 1

[VBBV]

Use limit output option for selecting integrator saturation limits. May be in your case, its running indefinitely.

[Kunal Vasudeo Mahajan]

I changed limits and changed solver too still not getting desirable output.

Can you please help me ?

[VBBV]

Add a summer block before the Integrator block and give a feedback loop. It seems your velocity values in scope display block dont seem realistic. There are also no damping and stiffness gains the feedback that need to be connected to summer (adder) block in the feedback

Answer 2

[Sam Chak]

@Kunal Vasudeo Mahajan

The evolution of the states due to one or some unknown singularity-induced terms (something happened in the feedback loop, not displayed in the image) caused the system to blow up to .

Please check the Equations of Motion for the division-by-zero terms, or the logarithmic or trigometric singularities. A light aircraft probably have the mass of 5,000 kg.