Parametric Design of Three-Dimensional Hydrodynamic Shapes

Overview

The document outlines a patent application for a method of parametric design of three-dimensional shapes, particularly focusing on hydrodynamic applications such as propulsor blades and submarine sails. The invention aims to enhance the design and analysis of complex, free-form shapes that are essential for improving the performance of underwater and surface vehicles.

The background section highlights the need for fair and efficient designs in vessels, emphasizing the importance of shapes that optimize speed, drag, fuel consumption, noise, maneuverability, and seakeeping. The invention addresses the limitations of existing design methods, particularly in creating shapes that are not solely propulsors, thereby expanding the scope of design possibilities.

The core of the invention involves a computer-aided design (CAD) method that begins with an initial design file representing a three-dimensional shape. This method extracts parametric features by intersecting the shape with multiple surfaces to create intersection curves. The design process includes determining span-wise and chord-wise distribution parameters for these curves, which can be systematically modified to refine the design. This iterative approach allows for easy adjustments and enhancements to the shape, facilitating a better correlation between design features and hydrodynamic performance.

The document also emphasizes the ability of the design algorithm to define blade tip fillets independently, which is crucial for designs that require structural support. The parametric design system is noted for its systematic modifications, which assist in design refinement and enhance the understanding of how shape characteristics influence hydrodynamic and hydroacoustic performance.

In summary, the invention provides a comprehensive framework for the parametric design of three-dimensional hydrodynamic shapes, enabling designers to create and analyze complex forms that meet specific performance criteria. The method's systematic approach to modifying design parameters and its applicability to various shapes, including advanced submarine sails, positions it as a significant advancement in the field of computer-aided design for marine applications. The document concludes by stating that the invention may be utilized by the U.S. government without royalty payments, indicating its potential for governmental and military applications.