Rutgers University Engineers Develop Motor-Free Flapping Wing Drone

Engineers at Rutgers University in New Jersey have made significant advancements in drone technology by developing a bird-like drone that operates without motors, gears, or mechanical linkages. This experimental drone, referred to as a solid-state ornithopter, utilizes the piezoelectric effect, where specific materials change shape when voltage is applied. The research, published in the journal *Aerospace Science and Technology*, was led by aerospace engineers Xin Shan and Onur Bilgen.

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The solid-state ornithopter employs layers of Macro Fiber Composites (MFCs) bonded directly onto flexible carbon-fiber wings. When electricity flows through these MFCs, the wings flap, twist, and morph, mimicking the muscular action of birds in flight. Bilgen explains, “We apply electricity to the piezoelectric materials, and they move the surface directly, without extra joints, extra linkages, or motors.” This design eliminates the need for mechanical components, making it a "mechanism-free" system.

Rutgers researchers develop motor-free flapping wing droneScientists Showcase a Solid-State Ornithopter Design — But Lack the Materials to Build ItTechSpot

The adaptability of the solid-state ornithopter makes it suitable for various applications, including search and rescue operations, environmental monitoring, and urban package delivery. Its ability to navigate complex environments is enhanced by the flexibility of its wings, which can twist and flex, allowing for greater maneuverability. The researchers have developed a computational model that simulates the drone's behavior, integrating aerodynamics, electrical dynamics, and control architecture, enabling them to test designs that are not yet physically built.

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Bilgen notes that the current limitation lies in the performance of existing piezoelectric materials, stating, “Today’s piezoelectric materials are not capable enough.” However, the mathematical model developed by the team provides a framework for future advancements in material science, potentially leading to the realization of these designs.

Rutgers researchers develop motor-free flapping wing drone

While the research presents a promising direction for drone technology, it faces challenges related to material capabilities. Critics may point out that without suitable materials, the practical application of the solid-state ornithopter remains uncertain. Bilgen acknowledges this, emphasizing the need for further material development to bring their simulations to life.

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The implications of this research extend beyond aerial vehicles. The principles and materials used in the solid-state ornithopter could also enhance renewable energy systems, such as turbine blades, allowing for real-time adjustments to improve aerodynamic efficiency. Bilgen asserts, “We don’t want to just mimic nature; we want to exceed what nature does,” highlighting the ambition behind this innovative approach.

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• “We apply electricity to the piezoelectric materials, and they move the surface directly, without extra joints, extra linkages, or motors,” — Onur Bilgen, Associate Professor, Rutgers University

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• “Today's piezoelectric materials are not capable enough,” — Onur Bilgen

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• “We can show the feasibility of designs that are not yet physically possible.” — Onur Bilgen

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This research marks a significant step toward the development of advanced aerial vehicles that could revolutionize various industries by combining principles of aerodynamics, materials science, and biomechanics into a single design model.

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