The main steam pressure control system of boilers has a lot of characteristics, include the large inertia, the highly delay, and the nonlinear and time-varying, there are many disturbance factors in its operation and it is hardly to control. In order to solve this situation, this article integrates the advantages of the Fuzzy Control and the PID control. We design the fuzzy-PI controller by combining the SIMULINK and FUZZY tool box organically. The simulation results show that this control method greatly enhances the control effect of the nonlinear, hysteresis system, and improves the system's flexibility and adaptability.
As the scale of complex system is growing larger and larger, interferences from intemal and outer system can rcsuh in the collapse of one subsystem in a complex system. They will not only make one subsystem collapse but also influence the other subsystems. Moreover, the whole complex system can collapse consequently. The mechanism of collapse of complex system is due to the brittleness of complex system lhat is presented and argued as the basic characteristic in this paper. It is the brittleness link entropy between subsystems that leads to the collapse of whole system. Effective ways that can be adopted to reduce the brittleness entropy can see the successful control of brittleness.
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