Laser Surface Structuring for Low-Drag Movable Bodies

The patent segments the laser processing into multiple passes with different functions: a first laser beam forms a groove structure, and a second laser beam forms protrusions between the grooves. This segmentation allows precise control over the riblet structure geometry, achieving both low friction resistance and high manufacturing precision that cannot be obtained with a single laser beam approach.

The patent applies different laser processing parameters and beam characteristics to different regions of the surface. The first laser beam creates grooves with specific depth and width, while the second laser beam creates protrusions with controlled dimensions. This local quality approach ensures that each part of the riblet structure has the optimal geometry for reducing fluid friction, while maintaining overall structural precision.

The patent employs a single movable platform that serves multiple functions: it positions the object relative to both laser beams, controls the scanning motion for groove formation, and enables the sequential processing by the second laser beam. This multi-functional platform reduces device complexity compared to using separate positioning systems for each laser beam, while still achieving the required precision for riblet structure formation.

The patent combines the positioning and scanning functions into a unified movable platform system that coordinates the motion of the object under both laser beams. By merging these functions into a single integrated system rather than using independent positioning mechanisms for each beam, the overall device complexity is reduced while maintaining the ability to form precise riblet structures for friction reduction.