Artículos de revistas
Data Acquisition System For Sprinkler Uniformity Testing
Registro en:
Applied Engineering In Agriculture. Asae, St. Joseph, Mi, United States, v. 16, n. 2, p. 123 - 127, 2000.
8838542
2-s2.0-0034149137
Autor
Zanon E.R.
Testezlaf R.
Matsura E.J.
Institución
Resumen
The scope of this work was to develop and evaluate a data acquisition system (DAS) to automate sprinkler uniformity distribution testing. The system was designed to perform indoor tests for low and medium pressure sprinklers using a two radii collector pattern. The data acquisition system consisted of a PC/AT 386 computer connected to an A/D converter, which received signals from 16 collector-transducer devices. The measuring principle of those collectors was to use the output of load cells to estimate the volume accumulated inside each collector. Four tests of the Naan 501-U sprinkler were conducted to evaluate the system performance. Weight readings were taken at 30, 60, 90, and 120 min during each test. The average volume weight readings taken at the end of the tests (120 min) were compared to volume values estimated using a digital scale. Those readings were used to create an overlapping grid pattern for a 6 m (19.7 ft)×6 m (19.7 ft) sprinkler spacing. Statistical parameters and uniformity coefficients were calculated for both methods (DAS and scale). Sprinkler discharge and operating pressure were monitored by transducers connected to the system. No statistical differences were found between recording methods (P<0.05). The same conclusion could be made for the uniformity coefficients. The maximum standard deviation of measurement dispersion for the data acquisition system readings was 0.35 mL (0.01 oz). The results showed that the DAS is a reliable system for sprinkler uniformity testing using a radius pattern. The developed automated system proved to be easy to install without requiring specific skills to assemble. 16 2 123 127 Bennett, W.S., Evert Jr., C., (1980) What Every Engineer Should Know about Microcomputers: Hardware/software Design, , New York, N.Y.: Marcel Dekker, Inc Bilansky, W.K., Kidder, E.H., Factors that affect the distribution of water from a medium-pressure rotary irrigation sprinkler (1958) Transactions of the ASAE, 1 (1), pp. 19-28 Christiansen, J.E., (1942) Irrigation by Sprinkling, , Calif. Agric. Exp. Sta. Bul. 670. Berkeley, Calif.: University of California Dally, J.W., Riley, W.F., Mcconnell, K.G., (1984) Instrumentation for Engineering Measurements, , New York, N.Y.: John Wiley & Sons Doebelin, E.O., (1983) Measurement Systems: Applications and Design, 3rd Ed., , New York, N.Y.: McGraw-Hill Fischer, G.R., Wallender, W.W., Collector size and test duration effects on sprinkler water distribution measurement (1988) Transactions of the ASAE, 31 (2), pp. 538-542 Foroud, N., Hlibka, D., Instrumentation for simultaneous recording of water level in digital and graphical forms (1989) Transactions of the ASAE, 32 (2), pp. 538-542 Kincaid, D.C., Sprinkler pattern radius (1982) Transactions of the ASAE, 25 (6), pp. 1668-1672 Seginer, I., Kants, D., Nir, D., Von Bernuth, R.D., Indoor measurement of single-radius sprinkler patterns (1992) Transactions of the ASAE, 35 (2), pp. 523-533 Silva, A.M., Vilas Boas, M.A., Oliveira, M.S., Comparison of sampling methods for water spatial distribution in rotary sprinklers (in Portuguese) (1994) Proc. XXIV Brazilian Congress of Agricultural Engineering, , Paper No. 94-3-311, Campinas, SP. Brazilian Society of Agricultural Engineering Solomon, K., Variability of sprinkler coefficient of uniformity test results (1979) Transactions of the ASAE, 22 (5), pp. 1070-1080 Villas Boas, M.A., (1994) Sampling Methods and Analysis of Water Spatial Distribution for Rotary Sprinklers (in Portuguese), , M.Sc. thesis. ESAL, Lavras, MG Zanon, E.R., Testezlaf, R., Use of load cells in radius layout sprinkler uniformity tests (1995) Proc. XXIV Brazilian Congress of Agricultural Engineering, 254. , Viçosa., M.G. Brazilian Society of Agricultural Engineering