Abstract:For artificially simulating rainfall with variable intensity in laboratory, a linear relation between the simulated rainfall intensity and the frequency of flow rate, and that between the frequency and the regulating voltage of electric actuator were established through analyzing the performance parameters of the actuator; subsequently, an automatic control system for such a simulation was designed based on the flow rate regulation of water supply. An automatic control algorithm with variable timestep was proposed based on the LabVIEW language and then applied into gradation control on the water supply in the artificial rainfall system by analyzing the performance parameters of signal acquisition equipment and the voltagemechanical sensitivity of electric actuator. The voltagemechanical sensitivity of electric actuator was 0.2 mm/V, and the minimum control accuracies of frequency of water supply flow rate and rainfall intensity were 7 Hz and 0.053 mm/min, respectively. The experimental results indicated that the relative error between the rainfall intensity achieved and the designed one is less than 4%; the fidelity and the stability of simulated rainfall intensity is above 0.98; the spatial homogeneity coefficient of rainfall intensity is above 0.97; the linear correlation coefficient of rainfall intensity is above 0.75.
周奇, 岑国平, 张亮, 陈太红. 变雨强人工模拟降雨自动控制系统设计与试验[J]. 排灌机械工程学报, 2012, 30(4): 473-478.
Zhou-Qi, CEN Guo-Ping, ZHANG Liang, CHEN Tai-Hong. Design and test of automatic control system of artificially simulating rainfall with variable intensity. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(4): 473-478.
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