Abstract
During the multi-channel confluent water supply process, the pressure control of the main pipe is often held back by such problems as non-linearity, hysteresis and parameter uncertainty, its own unique load dynamic changes, channel switching disturbance and other system characteristics caused by the actual working conditions. Moreover, pressure fluctuations in the main pipe will lead to a reduction in the service life of fire-fighting equipment, an increase in the failure rate, and even an interruption of the fire-fighting water supply. Therefore, a master and auxiliary control strategy is proposed to stabilize the pressure change in the process of multi-channel concentrated water supply switching, by using variable universe fuzzy proportional integral derivative (PID) control as the main controller on the main pipe and traditional PID control as the subsidiary controller on the channel. The control strategy is verified by the co-simulation platforms of LabVIEW and AMESim. Simulation results show that the variable universe fuzzy PID control and the master and auxiliary compound control based on the variable universe fuzzy PID control have advantages in step response, tracking response and anti-interference, respectively. The parameters obtained in the co-simulation are used in the experimental system. The experimental results show that the maximum deviation rate of main pipe pressure can be reduced by about 10% compared with other control methods under different loads. In conclusion, the proposed control strategy has strong anti-interference ability, fast dynamic response speed, high stability and good peak shaving effect.
Highlights
Fire water supply is an important component in fire-fighting and rescue operations, and plays a key role in determining its success or failure
In order to facilitate the comparison and analysis, we use a set of proportional integral derivative (PID) parameters with better control effects (Kp0 = 4.5, Ki0 = 3.4, Kd0 = 10, T = 0.05 s) while the rest of the basic parameters are exactly the same, and the control effect of three controllers is observed under different target signals
It can be seen from the figure that, when the set value of the main pipe changes in a step, the control effect of the multi-channel confluent water supply (MCCS) system using the variable universe fuzzy PID is compared with the traditional PID control and adaptive fuzzy PID
Summary
Fire water supply is an important component in fire-fighting and rescue operations, and plays a key role in determining its success or failure. Fire water supply is developing in the direction of high efficiency and high stability with the increasing complexity of fire accidents and the increasing number of fire truck dispatches. As the pivotal aspect of the fire water supply, the multi-channel confluent water supply (MCCS) system is very important in ensuring the efficiency of water supply for fire-fighting and rescue work. In the event of large-scale fires, especially a fire located in a city with limited space, the is flow of fire-fighting water supply required, but there is a higher demand for the stability of the water supply. The process of channel switching will inevitably occur in the multi-channel confluent water supply, which will lead to the pressure change of the water supply system. The common manifestation of pipeline pressure changes is water hammer, which can
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