Irrigation Span Alignment Guide That Filters Torsional Rotation
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Solution Overview
Problem
Mobile irrigation systems face challenges in accurately maintaining lateral alignment between spans due to vertical and torsional movements, leading to false misalignment signals and inefficient operation.
Innovation Solution
The mobile irrigation system incorporates an alignment system that allows three degrees of freedom between adjacent spans while tracking only lateral pivoting, using a linkage system and control system to filter out the effects of torsional rotation and vertical pivoting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the alignment system allows three degrees of freedom between adjacent spans to accommodate uneven terrain, then the system's adaptability to terrain variations is improved, but false or inaccurate misalignment signals occur due to vertical and torsional movements
Solution Approach 1:
The alignment system is segmented into independent functional components: a lateral alignment sensor that only measures lateral deviations, separate from vertical and torsional movement capabilities. This segmentation allows the system to accommodate three degrees of freedom while maintaining precise lateral alignment measurement by isolating the measurement function from interfering movements.
Solution Approach 2:
An intermediary alignment sensor is introduced between the spans and the control system. This sensor specifically detects lateral alignment deviations while being insensitive to vertical and torsional movements, acting as a mediator that filters out unwanted movement information and provides only relevant lateral alignment data to the control system.
2Measurement precision
If the alignment system continuously monitors lateral alignment between spans, then the alignment precision is improved, but energy is wasted due to unnecessary activation of drive motors to correct false misalignment signals
Solution Approach 1:
The system implements selective feedback where the lateral alignment sensor provides feedback only when genuine lateral misalignment is detected. The control system receives filtered information that distinguishes between actual alignment errors and false signals caused by vertical or torsional movements, enabling targeted correction actions that avoid unnecessary motor activation and energy waste.
Solution Approach 2:
The harmful element of false alignment signals is extracted and separated from the useful alignment information. The alignment sensor is designed to extract only lateral alignment data, excluding vertical and torsional movement information that causes false signals. This extraction process eliminates the source of erroneous feedback that would trigger unnecessary motor corrections.
3Ease of operation
If the joints allow vertical and torsional movement to accommodate uneven terrain, then the system's ease of operation is improved, but the alignment system's ability to accurately track lateral alignment is worsened
Solution Approach 1:
The joint's three degrees of freedom are segmented in function: vertical and torsional movements are permitted to maintain ease of operation on uneven terrain, while lateral alignment measurement is segmented as a separate, independent function performed by a dedicated sensor that remains insensitive to the other two movement types.
Solution Approach 2:
The alignment measurement system is made dynamic and selective, adapting to allow vertical and torsional movements while maintaining precise lateral tracking. The sensor dynamically responds only to lateral deviations, filtering out other movement types, thus enabling the system to be both operationally flexible on uneven terrain and measurement-precise for lateral alignment.
Data Source
AI summary
A mobile irrigation alignment system comprising a base mounted on a first span, a linkage system, and a control box. The linkage system includes a driven arm, drive arm, and control arm. The driven arm is pivotably connected to the base about a vertical axis. The drive arm is pivotably connected to the driven arm about a horizontal axis and includes a distal end configured to rest on an adjacent span. The control arm is linked to the driven arm. The control box determines lateral alignment between the spans based on the control arm as governed by the drive arm and driven arm. The drive arm is configured to retain an upright orientation relative to the driven arm regardless of torsional rotation between the spans so that the position of the control arm and hence the lateral alignment determination is not affected by the torsional rotation between the spans.