Hedan Bai

Hedan Bai
Cornell University | CU · Sibley School of Mechanical and Aerospace Engineering

About

15
Publications
6,683
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429
Citations

Publications

Publications (15)
Article
Conventional strain gauges are not designed for accurate measurement over the large range of deformations possible in compliant textiles. The thin, lightweight, and flexible nature of textiles also makes it challenging to attach strain gauges in a way that does not affect the mechanical properties. In this manuscript, soft, highly extensible fibers...
Article
Full-text available
Since the modern concepts for virtual and augmented reality are first introduced in the 1960's, the field has strived to develop technologies for immersive user experience in a fully or partially virtual environment. Despite the great progress in visual and auditory technologies, haptics has seen much slower technological advances. The challenge is...
Article
Full-text available
Artificial muscles based on stimuli-responsive polymers usually exhibit mechanical compliance, versatility, and high power-to-weight ratio, showing great promise to potentially replace conventional rigid motors for next-generation soft robots, wearable electronics, and biomedical devices. In particular, thermomechanical liquid crystal elasto-mers (...
Conference Paper
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SmartSuit is an advanced planetary spacesuit for the next generation of exploration missions that capitalizes on a novel architecture to improve on current gas-pressurized spacesuits. The SmartSuit, while gas-pressurized, also incorporates the following three technological innovations: 1) a full-body soft-robotic layer inside the gas-pressurized su...
Article
INTRODUCTION: Current spacesuits are cumbersome and metabolically expensive. The use of robotic actuators could improve extravehicular activity performance. We propose a novel method to quantify the benefit of robotic actuators during planetary ambulation. METHODS: Using the OpenSim framework, we completed a biomechanical analysis of three walking...
Article
Robots have been built to accomplish specific tasks with high repeatability instead of general utility. Taking inspiration from the evolution of animals to survive and adapt to changing environments, we discuss how a bottom up approach that begins with new materials could lead to robots that may address needs for autonomy and general utility across...
Article
Full-text available
Silica-based distributed fiber-optic sensor (DFOS) systems have been a powerful tool for sensing strain, pressure, vibration, acceleration, temperature, and humidity in inextensible structures. DFOS systems, however, are incompatible with the large strains associated with soft robotics and stretchable electronics. We develop a sensor composed of pa...
Technical Report
Full-text available
The "SmartSuit" is a novel spacesuit intelligent architecture for extravehicular activity (EVA) operations on Mars and other planetary environments that increases human performance by an order of magnitude on several quantifiable fronts for exploration missions. The SmartSuit spacesuit, while gas-pressurized, also incorporates soft-robotics technol...
Poster
Full-text available
We propose a novel spacesuit intelligent architecture for extravehicular activity (EVA) operations on Mars and other planetary environments that increases human performance by an order of magnitude on several quantifiable fronts for exploration missions. The proposed SmartSuit spacesuit, while gas-pressurized, also incorporates soft-robotics techno...
Article
Whereas vision dominates sensing in robots, animals with limited vision deftly navigate their environment using other forms of perception, such as touch. Efforts have been made to apply artificial skins with tactile sensing to robots for similarly sophisticated mobile and manipulative skills. The ability to functionally mimic the afferent sensory n...
Article
Full-text available
Soft materials possess several distinctive characteristics like controllable deformation, infinite degrees of freedom, and self‐assembly that make them promising candidates for building soft machines, robots, and haptic interfaces. In this article, we review recent advances in intrinsically soft materials, and soft‐material‐enabled robots, machines...
Article
Full-text available
Soft materials possess several distinctive characteristics like controllable deformation, infinite degrees of freedom, and self‐assembly that make them promising candidates for building soft machines, robots, and haptic interfaces. In this article, we review recent advances in intrinsically soft materials, and soft‐material‐enabled robots, machines...
Article
Full-text available
Front Cover: Photomechanical polymeric materials could be the future for building light‐driven soft robotic actuators. In article number 1800815, Robert F. Shepherd and co‐workers propose a simple synthesis and processing route for the fabrication of a self‐healing photomechanical elastomer. This material enables the construction of complex 3D shap...
Article
Full-text available
This article introduces a simple two‐stage method to synthesize and program a photomechanical elastomer (PME) for light‐driven artificial muscle‐like actuations in soft robotics. First, photochromic azobenzene molecules are covalently attached to a polyurethane backbone via a two‐part step‐growth polymerization. Next, mechanical alignment is applie...
Article
Technologies that use stretchable materials are increasingly important, yet we are unable to control how they stretch with much more sophistication than inflating balloons. Nature, however, demonstrates remarkable control of stretchable surfaces; for example, cephalopods can project hierarchical structures from their skin in milliseconds for a wide...

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