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<p>Modern aerial drones have started to take over jobs that are complicated for humans. Aerial drones serve a wide range of purposes, including aerial deliveries, surveying, agriculture, photography, and emergency response. However, drones’ widespread usage is limited by the significant noise they generate during flight, which often violates urban noise regulations. The high noise levels violate noise regulations that are enforced in certain cities, thereby restricting them from flying through urban areas. In 2017, Massachusetts Institute of Technology’s Lincoln Laboratory introduced a new type of propeller that will ultimately make drones more useful as its innovation reduces sound while in flight, thanks to its closed-loop geometric shape and the omission of the leading edge where the noise is generated. Such a design is intended to enable drones to operate more quietly in urban areas where noise is highly regulated. The Graphical representations illustrate how the closed-loop design of the Toroidal propeller minimizes acoustic emissions correlated with conventional blades. Additional figures highlight the potential of additive manufacturing approaches to create these difficult geometries, potential scalability, and support rapid prototyping. This paper reviews Massachusetts Institute of Technology’s Toroidal Propeller, a significant innovation that could enhance the potential for commercial drone usage by reducing acoustic signatures.</p>

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Enabling quiet urban flight: MIT’s toroidal propeller as a game-changer in reducing drone acoustic signatures

  • 期刊论文

  • 发表日期：

    2025年7月2日

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  • Clarence Edmund P. Dela Cruz,
  • Aldrin Calderon

摘要

Modern aerial drones have started to take over jobs that are complicated for humans. Aerial drones serve a wide range of purposes, including aerial deliveries, surveying, agriculture, photography, and emergency response. However, drones’ widespread usage is limited by the significant noise they generate during flight, which often violates urban noise regulations. The high noise levels violate noise regulations that are enforced in certain cities, thereby restricting them from flying through urban areas. In 2017, Massachusetts Institute of Technology’s Lincoln Laboratory introduced a new type of propeller that will ultimately make drones more useful as its innovation reduces sound while in flight, thanks to its closed-loop geometric shape and the omission of the leading edge where the noise is generated. Such a design is intended to enable drones to operate more quietly in urban areas where noise is highly regulated. The Graphical representations illustrate how the closed-loop design of the Toroidal propeller minimizes acoustic emissions correlated with conventional blades. Additional figures highlight the potential of additive manufacturing approaches to create these difficult geometries, potential scalability, and support rapid prototyping. This paper reviews Massachusetts Institute of Technology’s Toroidal Propeller, a significant innovation that could enhance the potential for commercial drone usage by reducing acoustic signatures.