Laser Interference Riblets for Sharp Tips on Painted Surfaces
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Solution Overview
Problem
Current methods for applying riblets on aircraft and wind turbine surfaces are inefficient, as they either result in riblets with blunt tips, require complex and error-prone processes, or have limited processing speeds, making them economically unfeasible for large-area applications.
Innovation Solution
Direct Laser Interference Patterning (DLIP) is used to create riblets on already painted and cured surfaces, allowing for high-speed, large-area application with sharp rib tips and efficient production, by overlapping coherent laser beams to form interference patterns that remove material and create grooves with precise dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If adhesive film lamination is used to apply riblets, then the surface can be modified with riblet structure, but the rib tips become blunt and the weight increases
Solution Approach 1:
The patent replaces mechanical lamination and embossing processes with direct laser interference patterning. The laser beam directly removes material to create sharp rib tips without requiring adhesive films or mechanical contact, thereby eliminating the weight penalty and achieving superior tip sharpness.
Solution Approach 2:
The patent changes the physical state and properties of the surface treatment process from mechanical contact-based methods to optical field-based laser interference. By controlling laser parameters (wavelength, intensity, pulse duration) and interference patterns, the process achieves precise rib tip geometry with minimal material removal, preserving sharpness without adding weight.
2Ease of manufacture
If silicone band embossing with UV curing is used, then riblet structure can be applied to painted surfaces, but the processing speed is slow and the process is complex
Solution Approach 1:
The patent replaces the mechanical silicone band embossing system with a direct laser interference patterning system. The laser beams create interference patterns that directly remove material to form riblets, eliminating the need for physical contact with silicone bands and subsequent UV curing steps, thereby dramatically increasing processing speed.
Solution Approach 2:
The patent extracts and eliminates the intermediate silicone band and UV curing steps from the manufacturing process. By using laser interference patterning, the riblet structure is created directly on the painted surface in a single step, removing unnecessary process complexity and time consumption.
3Manufacturing precision
If focused laser beam scanning is used to create riblets, then sharp rib tips can be achieved, but the processing speed is too slow for large areas
Solution Approach 1:
The patent segments the single focused laser beam into multiple parallel beams through a beam splitter. Each beam creates a line of riblets simultaneously, and by controlling the interference between beams, sharp rib tips are maintained while processing speed increases proportionally with the number of parallel beams.
Solution Approach 2:
The patent merges multiple laser beams into a coordinated interference pattern that simultaneously creates multiple riblet lines. The beams are combined in space and time to produce constructive and destructive interference that defines the riblet geometry, achieving both speed and precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables the economical and flexible production of riblets on aircraft, ships, and wind turbine generators, significantly reducing flow resistance and improving aerodynamic efficiency by creating riblets with sharp tips and precise dimensions, thus enhancing fuel efficiency and reducing operational costs.
Implementation Method 1
by overlapping coherent laser beams to form interference patterns
Implementation Method 2
laser interference patterning that remove material and create grooves
Data Source
AI summary
Method and device for producing riblets by applying the riblets by laser interference patterning by a carbon dioxide laser.