In the sewage treatment system, the dissolved oxygen concentration control, due to its nonlinear, time-varying, large
time delay and uncertainty, is difficult to establish the exact mathematical model. While the conventional PID controller
only works with good linear not far from its operating point, it is difficult to realize the system control when the
operating point far off. In order to solve the above problems, the paper proposed a method which combine fuzzy control
with PID methods and designed a fuzzy adaptive PID controller based on S7-300 PLC .It employs fuzzy inference
method to achieve the online tuning for PID parameters. The control algorithm by simulation and practical application
show that the system has stronger robustness and better adaptability.
Proc. SPIE. 8768, International Conference on Graphic and Image Processing (ICGIP 2012)
KEYWORDS: Mathematical modeling, Genetic algorithms, Detection and tracking algorithms, Data modeling, Visualization, Image processing, 3D modeling, Chemical elements, Engineering education, Current controlled current source
Timetabling Problem (TP) in colleges and universities has become more important and complicated with the further
reform in teaching and growing expansion of recruitment scale. In this paper, an optimized mathematical model of TP
was established .The framework structure to solve TP was found. According to characteristics of TP, GA was introduced,
a variety of improved schemes were designed, include: three-dimensional coding scheme, fitness function design scheme,
immunization strategy. Simulation results show that the proposed GA can satisfy multiple constraint conditions and
resolve TP more effectively.