Goal-based Fuzzy Control Optimization Of Centrifugal Sewage Pump Cavitation

The centrifugal sewage pump is the typical multi-phase flow fluid machinery, which is mainly used to transport and lift solid-liquid two-phase flow including a certain extent of gas. As an important character of sewage transportation by pump, the flow condition of sewage is so unstable that many uncertain factors including the selection for pump type and installation result in serious cavitations damage during the course of the pump long-term running. Cavitations damage is an unresolved problem in the sewage treatment system up to now.If cavitations are avoided as possible in the condition of the lower-capacity or large-capacity and heterogeneity of the sewage, the much difference between the pump suction pressure and the vapor pressure of the sewage must be retained, which will result in such erection error as very lower allowable suction head or very high negative suction head and the invalidation of the selection of pump type. Thus the selection of pump type and the installation cannot be satisfied with the unitive relation between the efficiency and reliability in the sewage treatment system at the same time. So the work condition regulation becomes a new way to control or mitigate the cavitations damage for ihe certain sewage pump, which has occurred cavitation.To the question, such work had been done in this paper as follows. First the influencing factors of the cavitation occurrence and control for the centrifugal sewage pump have been analyzed and the traditional ways to controlling cavitations damage for pump are summarized. Second the relation between various rotating speed regulation of the pump operation and cavitations performance has been discussed. Third the new idea about fuzzy control integrating with self-optimization arithmetic has been used to control the cavitations damage for the cavitation control being short of accurate mathematical model, certain control aim and the control properties including strong nonlinear effects, hysteresis effect etc. In the end the whole cavitation control of sewage pump was simulated in the SIMULINK environment on MATLAB. The simulation experiment shows that the new way can control a certain extent of cavitation of sewage pump effectively.