Mobile Irrigation Linkage Alignment for Torsion-Independent Tracking
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Solution Overview
Problem
Mobile irrigation systems face inaccuracies in lateral alignment due to vertical and torsional movements between spans, leading to unnecessary activation of drive motors for correction.
Innovation Solution
An alignment system that accommodates three degrees of freedom between spans, specifically tracking lateral pivoting without being affected by torsional rotation or vertical pivoting, using a linkage system with a driven arm, drive arm, control arm, and biasing element to determine and maintain accurate lateral alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the alignment system monitors all three degrees of freedom (lateral, vertical, and torsional movements), then the system can accommodate uneven terrain and joint freedom, but the alignment measurements become inaccurate due to false misalignment signals from vertical and torsional movements
Solution Approach 1:
The alignment system is segmented into independent measurement components: a lateral alignment sensor specifically for detecting lateral misalignment, and separate vertical alignment sensors for detecting vertical position. This segmentation allows the system to isolate and measure only lateral alignment without interference from vertical or torsional movements, resolving the contradiction between adaptability and measurement precision.
Solution Approach 2:
A linkage mechanism acts as an intermediary between the spans and the lateral alignment sensor. The linkage is designed to transmit only lateral movement to the sensor while filtering out vertical and torsional movements. This intermediary component enables the sensor to accurately measure lateral alignment even when the spans experience vertical or torsional displacements due to uneven terrain.
2Device complexity
If the alignment system uses traditional sensors that detect all movements, then the system structure is simple, but the drive motors are unnecessarily activated to correct false lateral misalignment
Solution Approach 1:
The alignment system employs specialized sensors with specific measurement orientations: lateral alignment sensors that only detect lateral misalignment and vertical alignment sensors that only detect vertical position. This local quality in sensor design ensures that each sensor measures only its designated parameter, preventing false signals from triggering unnecessary drive motor corrections and improving operational efficiency.
3Ease of operation
If the alignment system accommodates vertical and torsional freedom at joints, then the system can operate on uneven terrain, but lateral alignment measurements are adversely affected by these movements
Solution Approach 1:
The measurement system is segmented into independent channels for lateral and vertical alignment. Lateral alignment sensors are specifically oriented to detect only lateral misalignment between spans, while vertical alignment sensors separately monitor vertical position. This segmentation allows the system to maintain ease of operation on uneven terrain while ensuring accurate lateral alignment measurements are not contaminated by vertical or torsional movements.
Solution Approach 2:
The linkage mechanism serves as an intermediary that selectively transmits lateral movement to the lateral alignment sensor while isolating it from vertical and torsional movements. This allows the joints to maintain their freedom for accommodating uneven terrain while the measurement system accurately captures only lateral alignment information.
Data Source
AI summary
A mobile irrigation alignment system comprising a base mounted on a first span, a linkage system, and a control system. 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 system 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.