Hoisting System Deviation Correction Using Angle and Lateral Offset
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Solution Overview
Problem
The existing hoisting systems in port operations face challenges in automatic deviation correction due to uneven performance of frequency converters and ground flatness, leading to deviations in the advancing included angle and lateral displacement, which are difficult to correct manually and pose safety risks.
Innovation Solution
An automatic deviation correction control method that uses sensors to detect lateral displacement and advancing included angle, applying control algorithms to guide the hoisting system back to the center line by determining whether the detected values satisfy a preset condition, and adjusting the system's travel path to correct deviations efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual deviation correction is used, then the driver can adjust the hoisting system position, but the workload increases and safety risks remain
Solution Approach 1:
The hoisting system performs self-correction by automatically detecting its own deviation from the center line and adjusting its wheel speeds to correct the deviation, eliminating the need for manual intervention and reducing driver workload while maintaining safety
Solution Approach 2:
The system continuously monitors the hoisting system's position relative to the center line and uses this feedback to automatically adjust wheel speeds, creating a closed-loop control system that reduces both driver workload and safety risks
2Productivity
If velocity difference of tires is increased for deviation correction, then the correction efficiency improves, but the safety of rigid structure is compromised
Solution Approach 1:
The system dynamically adjusts the velocity difference between left and right tires based on the current deviation state, using small velocity differences for minor corrections and larger differences only when necessary, optimizing both correction efficiency and structural safety
Solution Approach 2:
The control algorithm adjusts wheel velocity parameters based on deviation magnitude and direction, changing the velocity difference parameter adaptively to achieve efficient correction while maintaining structural integrity
3Manufacturing precision
If existing control algorithms are used, then the system can correct deviation, but the correction is insufficient due to rigid structure constraints
Solution Approach 1:
The control algorithm segments the deviation correction into two independent components: lateral displacement correction and advancing included angle correction, allowing each component to be handled with simpler control logic while achieving high positioning accuracy
Solution Approach 2:
Instead of trying to correct both lateral displacement and advancing included angle simultaneously with a complex algorithm, the system inverts the approach by correcting them sequentially through separate control modules, simplifying the overall control complexity
Data Source
AI summary
The present invention provides an automatic deviation correction control method for a hoisting system, comprising the following steps: obtaining a lateral displacement X and an advancing included angle α generated by the deflection of the hoisting system; when the lateral displacement X is not 0 and the advancing included angle α is not 0, determining whether the lateral displacement X and the advancing included angle α satisfy a preset condition; if the lateral displacement X and the advancing included angle α do not satisfy the preset condition, controlling the hoisting system to correct the deviation toward a center line; and if the lateral displacement X and the advancing included angle α satisfy the preset condition, controlling the hoisting system to correct the deviation toward the center line in a reverse direction.