Singapore University of Technology and Design – Science

Small Yet Powerful: A Biomimetic Concept Soars

Denise Maddox — Fri, 08 Aug 2025 04:08:25 +0000

In a remarkable evolution of drone technology, the Singapore University of Technology and Design (SUTD) has unveiled a cutting-edge innovation in the form of a samara-inspired monocopter. This breakthrough comes a decade after the SG50 Multi-Rotor Drone project, which aimed to create a drone capable of flying for an impressive 50 minutes. Historically, most consumer quadcopters fell significantly short, often providing little more than half that flight duration. Under the aegis of Associate Professor Foong Shaohui, the original project not only met its endurance target but also highlighted the challenges posed by size, complexity, and weight in drone design.

Fast forward ten years, the focus at SUTD has drastically shifted. Rather than pursuing further efficiency improvements for the multi-rotor design, Assoc Prof Foong and his research team looked towards nature for inspiration, specifically the aerodynamic prowess of the samara—those spiral-winged seeds released by maple trees. Embracing a minimalist approach, they engineered a lightweight monocopter that utilizes a single actuator to enable efficient and controllable flight.

In their study published in the prestigious IEEE Robotics and Automation Letters, titled “Design and optimization of a samara-inspired lightweight monocopter for extended endurance,” the researchers disclosed their meticulous design process. The outcome is astonishing: a drone weighing only 32 grams capable of hovering autonomously for 26 minutes. This achievement far exceeds the performance metrics of typical drones within the same weight class, thereby challenging conventional understandings of drone performance.

As Assoc Prof Foong elaborated, the rationale behind this design transformation is rooted in the inherent inefficiencies associated with scaling down technologies. Small drones often succumb to poor endurance primarily due to the limitations of their small propellers, which generate finite thrust at high power consumption. Their innovative monocopter design addresses these limitations by adopting principles observed in nature, effectively reorienting drone design philosophy towards maximizing efficiency rather than merely increasing power.

Nature’s samaras utilize a clever approach, leveraging passive stability while crafting an aerodynamically efficient flight characteristic. Assoc Prof Foong emphasized that every portion of the maple seed contributes to its lift—an insight that was instrumental in developing an airframe design where each component serves a purpose without redundancy. This leads to a design ethos that champions resource efficiency and simplicity over excessive intricacy.

The integration of artificial intelligence has also played a vital role in this engineering endeavor. While inspiration was drawn from the natural world, the optimisation of wing geometries and balancing mass distribution was significantly enhanced through advanced AI-driven methodologies. Such techniques allow researchers to rigorously explore various design configurations efficiently, sidestepping the need for exhaustive manual testing.

Unlike traditional quadcopters that depend on multiple rotors for flight, the monocopter developed by the SUTD team demonstrates that a solo actuator suffices. This pivotal component spins the winged body to maintain stability via passive dynamics while simultaneously generating lift through the drone’s expansive airfoil design. The resulting structural integrity reflects a profound simplicity that belies its effective performance.

The optimization process behind the monocopter was exhaustive and intricately detailed. Combining classical aerodynamic theories with contemporary real-world performance models, researchers employed a surrogate optimization method, a cutting-edge data-driven algorithm to refine every aspect of the monocopter’s design. Ultimately, their efforts yielded a drone with a power loading ratio of 9.1 grams per watt, setting new standards for micro air vehicles in terms of both size and hovering capability.

Research Fellow Cai Xinyu, who contributed to the drone’s development, expressed the excitement of their achievement, noting the viability of small aerial robotics achieving endurance benchmarks traditionally expected from larger systems. This breakthrough demonstrates that advancement in drone technology does not solely hinge on increased size but can be achieved through refined engineering and intelligent design practices.

The potential applications for this monocopter are vast and varied. Its lightweight and enduring characteristics herald possibilities in low-cost, long-duration missions. Among these is the exciting proposition of a resilient, reusable radiosonde— a weather-monitoring instrument traditionally deployed via balloons. This innovative approach recently garnered recognition as the Sustainability Winner at the James Dyson Award for 2024, further validating the environmental impact and practical utility of this aerial technology.

While the current prototype leverages readily available commercial components, there are ambitious plans for the future. Research teams are aiming to explore bespoke materials to enhance the performance of the monocopter further while broadening its payload capacity and extending flight duration without significantly augmenting its weight. The evolving design will also consider bio-inspired morphologies, ensuring that every innovation continues to push the limits of drone capabilities.

The story of the SG60 monocopter encapsulates an impressive technological journey that illustrates not only continuity but a significant departure from traditional drone engineering paradigms. With aspirations set high, the SUTD team envisions developing a prototype capable of achieving over 60 minutes of flight duration, aptly commemorating Singapore’s upcoming 60th anniversary. In an emphatic statement, Assoc Prof Foong summarized their mission by highlighting that their work encapsulates not just technological innovation but a sustainable vision for the future of aerial robotics.

In summary, the development of the samara-inspired monocopter signifies a formidably innovative leap in drone technology, underpinned by a rigorous research approach, clear inspiration from nature, and the impactful integration of artificial intelligence into the design process. This project stands as a testament to the potential of biomimicry and advanced engineering in transcending previously understood limitations of drone technologies, providing a vision that challenges the conventions of scale and efficiency.

Subject of Research: Samara-Inspired Monocopter Design
Article Title: Small but mighty: A biomimetic idea takes flight
News Publication Date: October 2023
Web References: IEE Robotics and Automation Letters
References: N/A
Image Credits: Credit: SUTD

Keywords

Biomimetic drones, monocopter design, drone technology, lightweight drones, SUTD, AI in design, sustainable engineering.

3D Printing: Pioneering the Design of Bioinspired Structures

Denise Maddox — Fri, 24 Jan 2025 14:20:27 +0000

3D printing has revolutionized manufacturing since its inception in 1985, offering unprecedented possibilities in customization and quick prototyping. Yet, despite its growth and varying applications across fields like aerospace, medicine, and many more, 3D printing technology still has much room for advancement. A major hurdle identified in traditional practices is the layer-by-layer printing technique commonly used in various methods, which proves ineffective when dealing with materials such as silicone, epoxies, and urethanes. These materials can be complex, due to their slow-curing properties that often hinder the timely production of intricate designs.

Associate Professor Pablo Valdivia y Alvarado and his research team at the Singapore University of Technology and Design (SUTD) are at the forefront of addressing these limitations through innovative strategies and methodologies. Traditional 3D printing relies heavily on the nozzle’s set toolpath, limiting its efficiency, especially when dealing with soft mechanical metamaterials that are less forgiving in their liquid state. With a step into the future, this team proposes a remarkable approach aimed at enhancing the efficacy of direct ink writing, a 3D printing method more aligned with creating lightweight structures but currently constrained by non-optimized toolpaths.

Their innovative architected design approach, recently published, represents a significant advancement in the field. By breaking down complex 3D models into simpler points and shapes, Valdivia y Alvarado’s team was able to establish optimized toolpaths for printing. This technique enables them to create structures more efficiently, significantly reducing unnecessary motion during the printing process. Such accelerated production is crucial, particularly in applications requiring high precision and reliability.

The research team explored the nuances of working with silicone materials, particularly honing their properties to enhance the feasibility of employing them for direct ink writing. They experimented with commercially available silicone forms, meticulously calibrating them by adding a modifier known as Thivex, yielding a diverse range of material combinations. By doing so, they developed nine distinct formulations that provided improved flow and curing characteristics tailored for the printing process.

In putting their theories to the test, the researchers embarked on ambitious projects that involved 3D printing various bioinspired structures. Their experimental designs included cilia formations, webs, leaf-like structures, and intricate lattices. The results were promising; for instance, when integrating 3D-printed cilia into suction cups, they noted improved pull-off force, validating the strength and utility of the material innovations achieved through their new methods.

The impact of these enhancements extended beyond simply mechanical functionality. The team’s lattice structures demonstrated remarkable energy absorption capabilities, with reduction in peak impact forces by as much as 85%. This finding could have powerful ramifications, especially in sectors focused on safety and protection, such as automotive and aerospace industries, where lightweight yet resilient materials are in high demand.

Despite these promising developments, Associate Professor Valdivia y Alvarado emphasizes that the technology remains in the research phase. Yet, early indications point to strong potential for customized high-performance designs beneficial to various industries, including advanced robotics and wearable technologies. The ability to leverage soft robotics and tailored metamaterials could mark a paradigm shift in tackling complex engineering challenges across many sectors.

The integration of machine learning into their methodologies is another frontier that the SUTD team desperately hopes to explore next. By allowing users to specify desired performance metrics, machine learning could enable the development of metamaterials with customized properties, further enhancing the versatility of 3D printing technologies. This intersection of advanced computing and material science stands to adjust how designers and engineers approach the fabrication of complex geometries in the near future.

Continual innovation, experimentation, and collaboration will play vital roles in the team’s quest to improve scalability and cost efficiency for widespread industrial applications. Their vision of advancing deposition-based 3D printing by introducing multi-material capabilities offers an exciting glimpse into the future of engineered metamaterials. This approach not only enhances utility but also stimulates creativity and ingenuity in the field of engineering.

The ideas of engineered metamaterials spur interest in numerous applications, particularly in soft robotics, where adaptable structures can more seamlessly mimic their natural counterparts. As industries gear towards integrating more complex designs in machinery and technology, the material versatility resulting from SUTD’s research could opens doors previously inaccessible to conventional manufacturing practices.

With advancements rapidly reshaping the landscape of 3D printing technologies, the research led by Associate Professor Valdivia y Alvarado highlights an essential transition. The vision of personalized, advanced materials capable of creating customizable and adaptable designs is becoming increasingly achievable. Though challenges remain, the ongoing pursuit of innovation positions 3D printing as a key player in the future of manufacturing, where efficiency and functionality can meet or exceed current industry standards.

As the SUTD team moves forward, their developments not only aim to redefine the tenets of 3D printing but also challenge the boundaries of material science as a whole. The dedication to pushing these technologies toward commercial viability ensures that the future of production will not only benefit from the improvements seen thus far but will also remain flexible enough to adapt to emerging challenges in related fields.

This ongoing journey in advancing the capabilities of 3D printing echoes the fundamental ethos of research and development: to form a sustainable bridge between the theoretical and practical realms of engineering. As communities continue to rally behind the promise of 3D printing technologies, the evolution of soft mechanical metamaterials will be central to a broader narrative about what the future holds for manufacturing industries worldwide.

Subject of Research: Enhanced Toolpaths for 3D Printing Soft Mechanical Metamaterials
Article Title: Revolutionizing 3D Printing: Optimized Toolpaths and Material Innovations
News Publication Date: October 2023
Web References: DOI Link
References: Advanced Intelligent Systems, DOI: 10.1002/aisy.202400514
Image Credits: Singapore University of Technology and Design

Keywords

Additive manufacturing, 3D printing, soft mechanical metamaterials, toolpath optimization, engineered metamaterials