Before revision: Differential equations The differential equations which represent a double integrator are: where both : Let us now represent this in state space form with the vector : In this representation, it is clear that the control input is the second derivative of the output .
After revision: Differential equations The differential equations which represent a double integrator are where both Let us now represent this in state space form with the vector : In this representation, it is clear that the control input is the second derivative of the output .