排灌机械工程学报
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Journal of Drainage and Irrigation Machinery Engin  2012, Vol. 30 Issue (4): 473-478    DOI: 10.3969/j.issn.1674-8530.2012.04.019
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Design and test of automatic control system of artificially simulating rainfall with variable intensity
 ZHOU  Qi-1, CEN  Guo-Ping-2, ZHANG  Liang-3, CHEN  Tai-Hong-1
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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 timestep 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 voltagemechanical sensitivity of electric actuator. The voltagemechanical 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.
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Articles by authors
Zhou-Qi
CEN Guo-Ping
ZHANG Liang
CHEN Tai-Hong
Key wordsartificial rainfall simulation   variational rainfall simulation   electric actuator;turbine flowmeter     
Received: 2010-12-10; Published: 2012-07-30
Cite this article:   
Zhou-Qi,CEN Guo-Ping,ZHANG Liang et al. Design and test of automatic control system of artificially simulating rainfall with variable intensity[J]. Journal of Drainage and Irrigation Machinery Engin, 2012, 30(4): 473-478.
 
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