Robotic Livery Printing Motion Control for Precise Swath Alignment
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Solution Overview
Problem
Robotic printing systems for aircraft liveries face challenges in achieving high-quality printing due to inaccuracies in motion control and ink droplet placement, leading to resolution issues and distortion, especially when printing on large, irregularly shaped surfaces.
Innovation Solution
A robotic printing system that utilizes a combination of local sensing suites and global motion tracking devices to accurately control the motion platform and timing of ink ejection, ensuring precise alignment and placement of ink droplets by fusing data from range sensors, relative motion sensors, and optical sensors to maintain desired position, orientation, and velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If robotic printing systems use pre-defined paths based on 3D models to move the printing device, then the system can operate automatically and improve efficiency, but the motion accuracy deteriorates due to mismatches between the 3D model and the real object, registration errors, and tracking errors
Solution Approach 1:
The system employs multiple sensing suites (local and global) that continuously measure the actual position, orientation, and velocity of the printing device relative to the object surface. These measurements are fed back to the controller in real-time, allowing the system to detect and correct deviations from the planned path caused by model mismatches, registration errors, and tracking errors, thereby maintaining high printing precision while operating automatically
Solution Approach 2:
The system replaces reliance on pre-defined mechanical paths based on 3D models with a sensor-based measurement and control system. Instead of trusting the accuracy of the 3D model and mechanical positioning, the system uses optical and sensing systems to directly measure the actual relative motion between the printing device and the object surface, substituting mechanical path following with sensor-guided adaptive control
2Area of stationary object
If the motion platform moves the printing device across large surfaces, then the coverage area increases, but the motion accuracy deteriorates due to cumulative errors over long distances
Solution Approach 1:
The system divides the measurement task into local and global components. Local sensing suites measure short-range relative motion with high precision, while global motion tracking devices provide broader positional context. This segmentation allows the system to maintain high accuracy over large areas by continuously referencing local measurements rather than relying on cumulative positioning over long distances
3Manufacturing precision
If inkjet printers eject droplets at high spatial density to achieve high resolution, then the image quality improves, but the requirement for motion accuracy increases, making the system more sensitive to positioning errors
Solution Approach 1:
The system uses high-frequency measurements from sensing suites to continuously monitor the actual relative motion between the printing device and the object surface. This real-time feedback allows the controller to dynamically adjust the ejection timing and position of ink droplets, compensating for motion errors and maintaining reliable high-resolution printing even when operating at high spatial densities
Data Source
AI summary
The present disclosure provides a robotic printing system for printing images on the surface of an object. One exemplary system includes a printing module carried by a motion platform to directly eject printing materials on a surface. One aspect of this disclosure provides methods for accurately controlling the motion of the motion platform, generating accurate triggering signals for printing heads, and properly aligning adjacent swaths of an image.