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High strain rate mechanical behavior of polyurea

Abstract Stress–strain measurements are reported for an elastomeric polyurea in uniaxial tension over a range of strain rates from 0.06 to 573 s−1. The experiments were carried out on a new drop…
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RSS gradient-assisted frontier exploration and radio source localization

This work considers the combined problem of frontier exploration in a complex indoor environment while seeking a radio source and incorporates radio signal strength (RSS) information into the exploration algorithm by locally sampling the RSS and estimating the 2-D RSS gradient.
IEEE (opens in a new tab)

Application of Multi-Robot Systems to Disaster-Relief Scenarios with Limited Communication

In this systems description paper, we present a multi-robot solution for intelligence-gathering tasks in disaster-relief scenarios where communication quality is uncertain. First, we propose a formal…
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Virtual Impedance Method for Mutual Coupling Compensation

The radiation pattern of an antenna within an array environment is modified by mutual coupling to neighboring elements, which can create unknown phase and amplitude variation on the order of 10° and…
IEEE (opens in a new tab)

A parsimonious model for wireless connectivity in robotic networks

A minimalist model for estimating point-to-point wireless connectivity in robotic networks where every node in the network is mobile is presented and an estimation framework is developed that allows for these simple stochastic models to be predicted and updated based on sparse measurements.
IEEE (opens in a new tab)

Fast Distributed Beamforming without Receiver Feedback

A novel distributed beamforming technique that does not assume any feedback from the receivers or channel parameters, such as multipath fading, and an iterative pre-conditioning technique to mitigate the deleterious effects of the data points' conditioning on the convergence rate.
IEEE (opens in a new tab)

Low Frequency Multi-Robot Networking

The breadth and the depth of interaction between areas are described, leading to new tools and methods, especially in physically complex indoor/outdoor, dense urban, and other challenging scenarios.
IEEE (opens in a new tab)

Efficient base station connectivity area discovery

This paper proposes and test algorithms to autonomously discover the connectivity area for a base station in an unknown environment using an average of received signal strength (RSS) values and a RSS threshold to delineate the goodness of the channel.
SAGE (opens in a new tab)

Structure Evolution in a Polyurea Segmented Block Copolymer Because of Mechanical Deformation

Extensional stress−strain measurements on a polyurea (PU) were carried out at strain rates up to 830 s−1, in combination with ex post facto small-angle X-ray scattering (SAXS) measurements and…
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Experiments Toward the Application of Multi-Robot Systems to Disaster-Relief Scenarios

A formal problem statement for the application of multi-robot systems to intelligence gathering in disaster-relief scenarios is presented along with a suite of autonomy-enabled behaviors that support operation in a communications-limited setting.
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