A Study On Water Sampling System Of The Water Quality Monitoring Based On Adaptive Control

Essentially, Bio-style water quality monitoring make use of biological indicator to reflect the ecological status changes, for the water quality comprehensive evaluation. Bio-style water quality monitoring system works on the basis of dynamic water sampling procedures.Water sampling procedures for the Bio-style water quality monitoring system is very important, the quality of the sample water directly influences the quality of the monitoring results. Auxiliary water sampling device is a kind of device or system that control the procedure of water sampling. Qualified auxiliary water sampling device must be able to implement accurate real-time control of the temperature, flow rate and pH value of water sample.For the perspective of strict requirement of water sampling of Bio-style water quality monitoring system, a set of auxiliary water sampling system was designed on the basis of the adaptive controller. It is combined of the techniques of adaptive control, fuzzy control and serial communication and computer aided control. It is possible of the realization of on-line collecting water samples and the control water samples.The paper mainly discusses the following content:1, The paper discussed on the adaptive control technology. The first research was the three elements of the adaptive control mechanism, including the controlled object,decision-making mechanism,modification mechanism. Adaptive control could automatically compensate unpredictable changes about the model, parameters and input signals. Auxiliary water sampling device is a MIMO control system.The paper focused on the analysis of adaptive control of the MIMO system.2, The paper raised the auxiliary water sampling device based on adaptive control. It provided real-time, dynamic water sampls for the Bio-style water quality monitoring system,through the automatic control technique and so on. It accomplished the control of flow rate, temperature and pH, and made these indicators of water, which flows to the Bio-style water quality monitoring system, in the acceptable range, and remained the extracted biological features not influenced by these indicators. Then, behavior characteristic parameters could be extracted using dynamic image understanding technology for analysis and evaluation of water quality security.3, The auxiliary water sampling system based on adaptive control. Biological monitoring experiment environment indicators included flow rate, temperature,pH. On the basis of adaptive controller, a set of auxiliary sampling device system was designed, which included collecting unit, blending unit, draining unit and monitoring unit.The sampling controller was designed using MIMO fuzzy adaptive control algorithm. According to the changes of the external conditions, possible real-time regulation was conducted, so as to meet the requirement of experiment of Bio-style water quality monitoring system.4, The auxiliary water sampling device platform experiment. Fish as a biological indicator of water quality has obvious advantages, such as low cost, rich resource,drastic sensitivity, makes itself become preferred experimental object. In the experiment,changes of indicators of samples was analyzed by using dynamic data analysis techniques, stability and robustness of adaptive controller was assessed by adding artificial interference. The results showed that in the additional interference and man-made additional interference cases, auxiliary sampling system could adjust the system output quickly, so that the sample indicators could steadily follow the reference.The control of the water sampling procedure has broad application prospects, especially in the field of water quality monitoring, but as the experiment has some limitations, we are still looking forward to providing some reference value for future researches.