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An acoustic hailing device (AHD) being installed on a High Mobility Multipurpose Wheeled Vehicle (HMMWV) (Source: U.S. Army Picatinny Arsenal).

Research Efforts in Long-Range Acoustic Messaging

The Defense Systems Information Analysis Center (DSIAC) was asked to identify key players in U.S. Department of Defense research efforts in long-range (500–1,000 m) acoustic messaging. DSIAC searched open-source documents and the Defense Technical Information…

Barium Titanate Transducers

The Defense Systems Information Analysis Center (DSIAC) received a technical inquiry requesting information on barium titanate transducers and, more specifically, their use in Department of Defense organizations or their potential demand by such organizations. A…

Articles

Unmanned Underwater Tech Acquisition Bubbles to the Surface

WASHINGTON — The unmanned space has seen an uptick in acquisition activity recently. BAE Systems — the U.S. subsidiary of British multinational defense, aerospace and security company BAE Systems plc — announced the purchase of key assets of Riptide Autonomous Solutions, a provider of unmanned underwater vehicle (UUV) technology and solutions. According to the press

3-D Printed Active Metamaterials for Sound and Vibration Control

Researchers have been pushing the capabilities of materials by carefully designing precise structures that exhibit abnormal properties that can control acoustic or optical waves. However, these metamaterials are constructed in fixed geometries, meaning their unique abilities are always fixed. Now, new 3-D printed metamaterial developed by a team led by USC Viterbi researchers can be

Thin Engineered Material Perfectly Redirects and Reflects Sound

Metamaterials researchers at Duke University have demonstrated the design and construction of a thin material that can control the redirection and reflection of sound waves with almost perfect efficiency. While many theoretical approaches to engineer such a device have been proposed, they have struggled to simultaneously control both the transmission and reflection of sound in