The SPRD will automatically open as the air pressure in the duct system increases, in order to prevent the reduction of air flow and excessive noise and velocity through the duct system.

But for a multi time scale power system, existence and fundamental characteristics of fast manifolds must also be studied in order to obtain the model reduction condition of fixing slow dynamics.

SPIN adopts the partial order reduction strategy to reduce the number of system states that needs to be visited and stored in the state space to solve the model checking problem.