PID and fuzzy PID controller are applied into the pitch control system. PID control has simple principle and its parameters setting are rather easy. Fuzzy control need not to establish the mathematical of the control system and has strong robustness. The advantages of fuzzy PID control are simple, easy in setting parameters and strong robustness. Fuzzy PID controller combines with closed-loop optimal fuzzy reasoning (COFR), which can effectively improve the robustness, when the robustness is special requirement. MATLAB software is used for simulations, results display that fuzzy PID controller which combines with COFR has better performances than PID controller when errors exist.
A pipeline network security warning system is designed based on vibration detection techniques, which consist of the front nodes module, relay modules and the computer monitor center in this paper. Someone dig in the ground of pipeline and destruction of the pipeline, when pipe stress change and the acceleration sensor close to the walls of the pipe feel the stress change. The signal through sampling transmit to ARM processor and after Wavelet denoising and the genetic algorithm processing and to have the true and false judgment by the relay modules to the information of the computer monitoring and control center with GSM module, and then PC monitoring software sound and light alarm and forwarding alarm information to the related personnel. At last the experiment shows the system could fulfill the objectives, that is, lower false alarm ratio and higher response ability.