Transitivity of Commutativity for Second-Order Linear Time-Varying Analog Systems
This work provides a theoretical result for a niche class of analog systems, but the contribution is incremental as it extends known commutativity properties to a specific case.
The paper derives inverse commutativity conditions for second-order linear time-varying analog systems with non-zero initial conditions and proves that the transitivity property of commutativity always holds for such systems, regardless of initial states.
After reviewing commutativity of second-order linear time-varying analog systems, the inverse commutativity conditions are derived for these systems by considering non-zero initial conditions. On the base of these conditions, the transitivity property is studied for second order linear time-varying unrelaxed analog systems. It is proven that this property is always valid for such systems when their initial states are zero; when non-zero initial states are present, it is shown that the validity of transitivity does not require any more conditions and it is still valid. Throughout the study it is assumed that the subsystems considered can not be obtained from each other by any feed-forward and feed-back structure. The results are well validated by MATLAB simulations.