Session: 16-01-01: Poster Session: NSF-Funded Research (Grad & Undergrad)

Paper Number: 99685

99685 - Adaptable Hull Hydrodynamics Using Shape Morphing Curved-Crease Origami 

In shipbuilding, the topology of the hull surface plays an essential role in determining a hull’s hydrodynamic response. However, traditional methods of hull assembly generate static designs, where a hull can only perform well under a specific range of speeds or wavelengths. In this work, we introduce a novel technique of fabricating planing hulls following the principles of curved-crease origami, where active folding allows for shape morphing and adaptable hydrodynamic characteristics. These curved-crease origami structures offer additional advantages over conventional shipbuilding techniques like reduced joint complexity, improved structural stiffness, and rapid fabrication from a flat state.

 

We use the Bar and Hinge model for the kinematic analysis of curved-crease origami patterns and a simplified mathematical model based on Low Aspect-ratio Strip Theory to study the hydrodynamic characteristics of morphing hull geometry in calm and wavy water conditions. Results show that active control of hull hydrodynamics is achieved as the extent of actuation determines the hull deadrise angle. Higher actuation means a lower deadrise and a flatter hull profile which is beneficial in reducing frictional drag. In contrast, lower actuation means a higher deadrise which is especially beneficial for cutting through waves and reducing heaving and pitching motion.

 

Furthermore, we show that a passive control over hull hydrodynamics can be achieved by varying the length and curvature of the initial crease pattern. It is observed that the hulls show a resonant response for all hydrodynamic characteristics under specific wavelengths. Increasing the length and curvature of the hull typically results in lowering of the heave and pitch displacements and accelerations. This active and passive control allows us to steer clear of resonant behavior and ensure seakeeping fitness by reducing the possibility of motion sickness for passengers.

 

In conclusion, this work extends the merits of curved crease origami to more practical applications like naval engineering. It opens avenues for novel structural design methods in fields requiring adaptable structural responses against varying fluid flow.

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Keywords: Curved-crease Origami, Ship Hulls, Adaptable Hydrodynamics, Shape Morphing Surfaces

 

 

Presenting Author: Hardik Patil University of Michigan

Presenting Author Biography: Hardik is a Ph.D. Candidate in the Civil Engineering and Scientific Computing at the University of Michigan. His current research is focused on the analysis, design, and novel applications of origami-inspired structures. He holds a B.Tech (with Honors) in Civil Engineering from the Indian Institute of Technology Bombay and an MSE in Structural Engineering from the University of Michigan.

Authors:

Hardik Patil University of Michigan
Evgueni Filipov University of Michigan