Center Pivot Irrigation Flow Control and Speed Adjustment
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Solution Overview
Problem
Center pivot irrigation systems face challenges in maintaining uniform water application and efficiency due to varying input water flow rates and the inability to selectively irrigate irregularly shaped non-productive areas within a field, leading to wastage of water.
Innovation Solution
A controller system that adjusts the operation of nozzles and sprinkler arm speed to maintain a consistent water flow rate by pulsing valves open and closed, ensuring uniform water distribution and allowing selective irrigation of designated areas by determining the current geographic location and irrigation plan, thereby optimizing water use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the center pivot irrigation system operates with varying input water flow rates, then the system can adapt to changing water availability, but uniform water application depth cannot be maintained
Solution Approach 1:
The system dynamically adjusts the rotation speed of the sprinkler arm based on real-time water flow rate measurements. When water flow increases, the arm rotates faster; when water flow decreases, the arm rotates slower. This dynamic speed adjustment compensates for varying water availability and maintains uniform water application depth across the field.
Solution Approach 2:
The system incorporates flow meters that continuously measure water flow rate and provide feedback to the control system. This feedback loop enables the controller to calculate the required rotation speed adjustment and implement real-time speed control, ensuring uniform water application despite fluctuations in water supply.
2Ease of operation
If the sprinkler arm rotates at constant speed, then the system operation is simple, but uniform water application cannot be achieved when water flow rates vary
Solution Approach 1:
The system transitions from constant speed operation to variable speed operation. The rotation speed of the sprinkler arm is continuously adjusted based on measured water flow rates, enabling the system to maintain uniform water application while adapting to changing water availability conditions.
Solution Approach 2:
The system changes the operational parameter of rotation speed from a fixed constant to a variable parameter. The controller modifies the rotation speed in real-time based on water flow rate measurements, allowing the system to compensate for varying water supply and maintain uniform water application depth.
3Area of stationary object
If all nozzles are used to irrigate the entire circular area, then complete field coverage is achieved, but water is wasted on non-productive areas
Solution Approach 1:
The system applies different irrigation treatments to different locations within the circular area. By using GPS coordinates and an exclusion zone map, the controller identifies non-productive areas and selectively shuts off nozzles positioned over these zones, preventing water waste while maintaining irrigation in productive areas.
Solution Approach 2:
The system divides the circular irrigation area into productive and non-productive zones using GPS-based geofencing. The controller segments the nozzle operation accordingly, activating nozzles only over productive areas and deactivating them over exclusion zones such as roads, rocky areas, or non-crop regions.
4Manufacturing precision
If the system adjusts rotation speed to compensate for varying water flow, then uniform water application is maintained, but system complexity increases
Solution Approach 1:
The system uses flow meters to measure water flow rate and feeds this information back to the controller. The controller automatically calculates the required rotation speed adjustment and implements it, providing a closed-loop feedback system that maintains uniform water application while adapting to varying water supply conditions.
Solution Approach 2:
The system replaces complex mechanical speed adjustment mechanisms with an electronic control system. The controller uses electronic signals to adjust the rotation speed of the sprinkler arm based on flow meter measurements, simplifying the overall system while achieving precise speed control for uniform water application.
Data Source
AI summary
A center pivot irrigation system is described that includes a controller that makes use of a particular flow rate of input water to deliver a consistent depth of irrigation to user-defined areas under a pivot irrigator. The controller operates to pulse control valves for the nozzles/sprinkler heads on and off as the sprinkler arm rotates. The valve pattern along the span of the sprinkler arm is chosen during each operating cycle such that the total water flow through all the open valves matches the flow rate of the input or supply water to the pivot irrigator. To ensure a consistent depth, the speed is changed during valve duty cycles to match the density of open valves in the sprinkler arm. To ensure a consistent distribution under the sprinkler arm, each valve is monitored to ensure that the valves are given the same proportional share of the input water.