Ship Segment Jig Frame Height Control for Curved Surface Compensation
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Solution Overview
Problem
Existing ship segmental construction methods lack systematic correlation between jig frames, leading to subjective adjustments and poor compensation accuracy and efficiency.
Innovation Solution
A dynamic compensation method is introduced, establishing a correlation between jig frames through a segmental deformation compensation model and adaptive regulation algorithm, using cubic NURBS curved surfaces and PID-fuzzy control to adjust jig frame heights dynamically.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If each jig frame is adjusted and controlled independently in sequence, then the control process is simple for each individual frame, but the segmental shape cannot be kept well and compensation accuracy is poor
Solution Approach 1:
The patent merges multiple independent jig frames into a correlated control system where the height of each jig frame is dynamically adjusted based on the compression load and deformation range of the ship segment. The control system integrates measurements from multiple jig frames and uses a unified compensation model to coordinate their adjustments, transforming independent sequential control into a correlated systematic control that maintains segmental shape accuracy.
Solution Approach 2:
The patent implements feedback control by continuously measuring the actual height and compression load of jig frames during the construction process. The control system uses this feedback information to dynamically calculate and adjust the theoretical height of each jig frame based on the segmental deformation compensation model, ensuring that the segmental shape is maintained throughout the construction process rather than relying on pre-set independent adjustments.
2Manufacturing precision
If systematic repeated adjustment is implemented among correlated jig frames, then deformation compensation precision is improved, but the control system becomes more complex
Solution Approach 1:
The patent applies dynamics by making the jig frame heights dynamically adjustable rather than fixed. The control system continuously monitors the compression load and segmental deformation, and automatically adjusts the theoretical height of each jig frame in real-time based on the compensation model. This dynamic adjustment capability enables repeated systematic adjustments to maintain precision while the automation reduces the perceived complexity of manual coordination.
Solution Approach 2:
The patent changes the parameters of the jig frame system by introducing dynamic height adjustments based on compression load measurements. The control system modifies the height parameter of each jig frame according to the calculated deformation compensation values from the NURBS surface model, allowing the system to adapt to varying loads and maintain precision throughout the construction process.
3Ease of operation
If each jig frame is controlled separately with individual motors and sensors, then each device can be independently adjusted, but the external profile of the segmental curved surface cannot be well guaranteed
Solution Approach 1:
The patent applies universality by creating a unified control system that serves multiple jig frames simultaneously. The same compensation model and control algorithm are applied to all jig frames in the segment, allowing each frame to be independently adjusted while maintaining overall curved surface accuracy. The control system performs multiple functions: measuring compression load, calculating deformation compensation, and coordinating adjustments across all jig frames using a single integrated approach.
Data Source
AI summary
A dynamic compensation method for curved surface deformation in ship segmental construction includes fitting a curved surface and building a segmental deformation compensation model based on an acquired actual segmentation of a ship to obtain a theoretical height of a jig frame; establishing a correlation between jig frames based on a ship segmental deformation range and a compression load of the ship; and performing segmental deformation compensation according to an actual height and the theoretical height of the jig frame by adopting a preset adaptive regulation and control algorithm of jig frame height. According to the compensation method, a correlation between a reference jig frame and slave jig frames of each level is established.