Method of varying the speed of a center pivot irrigation system

Details Method of varying the speed of a center pivot irrigation system Method of varying the speed of a center pivot irrigation system

1998-09-14

2000-03-14

Douglas, Steven O.

Fluid sprinkling, spraying, and diffusing

Mobile distributor

Irrigation device

239727, 239729, 239 1, 239 11, B05B 300

Patent

active

060361212

ABSTRACT:
The method of controlling the speed of the last regular drive unit of a center pivot irrigation system having a corner irrigation system pivotally connected thereto is disclosed comprising the steps of: placing a pressure transducer at the downstream side of the main water line for monitoring the changes in main water line pressure as the sprinklers on the extension water line are sequenced; driving the last regular drive unit at a predetermined speed; recording the output of the pressure transducer at predetermined intervals; comparing the recorded output at the predetermined intervals to the pressure recorded when all the sprinklers on the extension line are turned off; and varying the speed of the last regular drive unit according to the formula NEW SPEED=(END PRESSURE/RETRACTED END PRESSURE).sup.1/2 .times.L.R.D.U. SPEED SETTING.

REFERENCES:
patent: 3902668 (1975-09-01), Daugherty et al.
patent: 3979062 (1976-09-01), Christensen et al.
patent: 4340183 (1982-07-01), Kegel et al.
patent: 4569481 (1986-02-01), Davis et al.

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