Inkjet Print Head Offset Compensation for Aircraft Livery Accuracy
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Solution Overview
Problem
Current inkjet printing systems for large aircraft surfaces face challenges in achieving high accuracy due to positional offsets caused by vibrations and inaccurate print controls, leading to delays and inefficiencies in producing complex liveries.
Innovation Solution
A printing system with a print head, actuator, position sensing system, and controller that detects actual position, determines positional offsets, and generates a nozzle firing pattern to compensate for inaccuracies, ensuring precise ink droplet placement on curved surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If large scale manipulators are used to print on large aircraft surfaces, then the printing area is increased, but the print accuracy deteriorates due to limited accuracy and vibrations
Solution Approach 1:
The system continuously monitors the actual position of the print head using a position sensing system and feeds this information back to the controller. The controller then adjusts the nozzle firing pattern based on the detected positional offset, creating a closed-loop control system that maintains print accuracy despite vibrations and positioning errors in large-scale manipulators
Solution Approach 2:
The system dynamically changes the nozzle firing pattern parameters based on detected positional offsets. By adjusting which nozzles fire and when they fire, the system compensates for position errors and maintains accurate ink droplet placement even when the print head position deviates from the target position
2Manufacturing precision
If traditional masking and spraying processes are used for each color, then color accuracy is maintained, but the production time increases to several days
Solution Approach 1:
The system merges multiple color printing operations into a single inkjet printing process. By using inkjet technology to print complex multi-color liveries directly without traditional masking and spraying steps for each color, the system dramatically reduces production time from several days to a much shorter duration while maintaining color accuracy through precise digital control
Solution Approach 2:
The system replaces the mechanical masking and spraying process with a digital inkjet printing system. Instead of physically masking areas and spraying paints sequentially, the system uses computer-controlled inkjet nozzles to deposit precise amounts of ink directly onto the aircraft surface, eliminating the need for masking materials and multiple manual spraying operations
3Adaptability or versatility
If inkjet printing is used to print complex liveries, then the design complexity is increased, but the print accuracy deteriorates due to positional offsets from vibrations
Solution Approach 1:
The system dynamically adjusts the nozzle firing pattern in real-time based on detected positional offsets. Rather than using a static printing pattern, the system continuously modifies which nozzles fire and their timing to compensate for vibrations and position errors, enabling accurate printing of complex designs even on large, vibrating aircraft surfaces
Solution Approach 2:
The position sensing system provides continuous feedback on the actual print head position, allowing the controller to generate corrected nozzle firing patterns that account for vibrations and positioning errors. This feedback loop enables the system to maintain high print accuracy for complex liveries despite the challenging printing environment
Data Source
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AI summary
A printing system (10) is provided comprising a print head (12) including a plurality of ink nozzles (14); an actuator configured to move the print head (12) relative to a substrate (11); a print head position sensing system (18) configured to detect an actual position (20) of the print head (12) relative to the substrate (11); and a controller (22). The controller (22) is configured to: receive the actual position (20) of the print head (12) detected by the print head position sensing system (18) corresponding to a target print head position (46); determine a positional offset between the actual position (20) and the target print head position (46); generate a nozzle firing pattern (32) based on the positional offset; and control the print head (12) to print the nozzle firing pattern (32) at the target print head position (46) using the plurality of ink nozzles (14).