Articles tagged with Applied Acoustics
Researchers at Pohang University of Science and Technology have developed a speaker system that can deliver sound to a single listener, using dual-domain metamaterials and a compact ultrasonic transducer. The system achieves highly directional audio generation, focusing sound at the front and blocking parasitic noise at the back.
Scientists have developed a new acoustic levitation technique using an ultrasonic beam capable of levitating and moving small objects in mid-air over distances of up to 40cm. The technique, which uses a zero-order Bessel beam, enables stable levitation six times further than previously achieved using conventional methods.
Researchers have discovered a wave-interference effect that makes sound energy appear to outrun fundamental limits without breaking physics. This finding could improve whale tracking by pinpointing the location of whales based on the phase of their calls.
Researchers from the University of Osaka developed an analytical tool called acoustic tweezers to investigate the mechanical properties of biopolymer condensates. The study found that changes in the natural movement of a droplet in solution can provide information on the stiffness of the droplet and the state of the molecules inside.
Researchers unveiled a technique to build ultra-clean 2D heterostructures using muscovite crystals, eliminating microscopic residues that disrupt electronic device performance. This method enables precise stacking of atomic layers, leading to new properties and potential breakthroughs in quantum computing and nanoelectronics.
The study found that dolphins visit two coastal communities along the Sea of Japan, with detection rates occurring once every ten days. The researchers recorded unique whistle characteristics in each bay, suggesting differences in sound environments or animal behavior.
Scientists have discovered a way to track whales using fiber-optic cables by detecting low-frequency pressure waves generated by their movement. This method allows researchers to identify whale tracks even when the animals are not vocalizing, expanding their capabilities for remote sensing applications.
A team of researchers at Penn State designed a system that can manipulate sound waves to produce high-quality audio in a precise, private area. The 3D-printed speaker cover uses acoustic metasurfaces to focus sound into a tight 'bubble' that is only audible within a small space.
Research finds that textured walls can improve speech clarity for deaf and hard-of-hearing individuals by controlling sound travel. The study developed a patterned wall design that can be tailored to different room shapes and sizes using 3D printing, offering personalized acoustic performance.
Photoacoustic imaging uses lasers to reveal hidden blood vessels and nerve bundles, guiding surgeons for fewer complications. The technique enables real-time augmented reality video feeds during laparoscopic surgeries.
Researchers linked neural activity to blind individuals' ability to determine object location using echolocation. Accuracy improved with repeated mouth clicks, suggesting a summation of information in the brain.
Researchers have created a carbon-fiber composite that swallows sound waves while retaining the strength of industrial load-bearing panels. The design achieves an average sound absorption coefficient of over 0.9 across a frequency range of 1,500 to 5,500 hertz.
Researchers at Texas A&M University and DEVCOM Army Research Laboratory developed a hybrid foam with a 3D-printed plastic skeleton, offering tunable, lightweight and ultra-durable properties. The composite combines ordinary foam with plastic struts, allowing it to absorb more energy and withstand greater forces.
Researchers developed a framework to predict acoustic streaming in mid-air phased arrays, revealing its influence on tactile perception and object stability. The study validates thermoviscous and atmospheric attenuation models, enabling precise sound-field design for safer ultrasonic interfaces.
Researchers use smartphone microphones to detect sound waves that can penetrate through rubble, helping locate trapped victims. The method achieved an error of 5.04 degrees away from the hypothetical victim in a field test on a disaster training site.
Researchers develop sustainable and efficient pest control method that doesn't harm bees, targeting vulnerable species like greater and lesser wax moths. The technique uses ultrasonic signals to deter the pests, offering a potential solution to declining bee populations and food security concerns.
A new neural network developed by Naveen Dhar can filter out false positives in gunshot detectors, providing accurate alerts for on-the-ground intervention. The system uses a web of autonomous recording units and a central hub to analyze audio data and pinpoint the location of gunshots.
A team of researchers designed a custom approach sound library for electric vehicles using low-frequency noise, which was found to be more effective at alerting pedestrians. The sounds were tested with volunteers and ranked highly on criteria such as urgency and noticeability.
In her book 'Sonic Socialism: Crisis and Care in Pandemic Hanoi', Christina Schwenkel explores how Vietnam used sound technologies to inform, regulate, and connect people during the pandemic. The country's success was largely due to its rapid communication systems, including loudspeakers and public health videos.
Researchers analyzed over 2,000 hours of underwater recordings to detect subtle shifts in red hind spawning behavior and population dynamics. The study found a notable shift in the balance of mating calls over the 12-year period, with calls linked to competition becoming dominant.
Mizzou researchers have discovered a way to 'listen' to molecules moving faster than the speed of sound, using photoacoustic spectroscopy. This technique could help unravel mysteries of astrochemistry and offer clues about the universe's composition, star formation, and life origins.
Researchers at Macquarie University discovered that listeners adapt to the characteristics of acoustic spaces to improve their understanding of speech. The 'Goldilocks' zone of reverberation, around 400 milliseconds, optimizes learning and adaptation.
New research finds Mars' mantle preserves a record of its violent beginnings, with chunky layers containing ancient fragments up to 4km wide. This discovery offers a rare glimpse into the evolution of rocky planets and challenges current understanding of planetary formation.
A research team has experimentally demonstrated a nonlinear wave phenomenon that changes its frequency depending on the direction of incoming waves. The system exhibits different responses to waves entering from one side versus the other, with potential applications in medical ultrasound imaging and noise control.
The Dyson-Harrop CubeSat system harnesses high-density energy from the solar wind and offers a compact, modular solution for space-based clean energy. It generates approximately 1 kilowatt of power, more than ten times greater than similarly sized conventional solar panels.
A study conducted at a Japanese school found that classrooms with sound-absorbing materials experienced reduced crying rates among young children, who were able to communicate more clearly. The research aimed to raise awareness about the importance of acoustics in educational settings and inspire regulations.
Researchers have developed a technique to create spin in liquid droplets using ultrasound waves, concentrating solid particles suspended in the liquid. This allows for the creation of novel technologies for biomedical applications and research on rotating systems.
Acoustic metamaterial enables pushing, rotating, and complex movements in 3D. Researchers can now move and position objects underwater without touching them directly, paving the way for applications like remote surgery and drug delivery.
Researchers from Brigham Young University and California State University, Bakersfield collected data on Falcon 9 rocket sonic booms to understand their impact. They found that the magnitude of sonic booms can vary greatly with weather conditions, launch time, vehicle trajectory, and time of year.
A study by Trinity Consultants identifies effective means of controlling data center noise, including sound barriers and low-frequency resonators. The goal is to create a quieter breed of data centers that can coexist with residential areas, protecting residents from excessive noise.
The initiative focuses on promoting conscious design processes to create quieter products, buildings and transportation systems to reduce noise pollution. By adopting a systems-thinking approach, it will address the root causes of noise and its impacts on people, environment and economy.
Baleen whale species that flee from killer whales produce calls at deep frequencies undetectable to their predators, while others sing higher-frequency songs that are easily heard. This 'flight' vs 'fight' difference influences all aspects of baleen whale behavior, from migration patterns and communication to mating and feeding habits.
A novel lab-on-chip platform uses acoustofluidics to efficiently separate rare circulating tumor cells, enabling real-time diagnosis. The system's precision and energy efficiency hold promise for improved cancer diagnostics and personalized medicine.
Scientists have created a thermoacoustic engine that converts thermal energy into acoustic energy, which can be transformed into mechanical or electrical energy. The device has the potential to generate power ranging from tens to thousands of watts and could be used for camping, backpacking, and emergency situations.
The Acoustical Society of America is hosting a virtual meeting from November 18-22, showcasing recent work on various topics including Alzheimer's disease detection and windfarms' impact on wildlife. Journalists can pre-register for press conferences and technical sessions.
An attorney and retired mechanical engineer highlights the need for infrastructure or limitations on play to address noise nuisance complaints from neighbors. He recommends building courts far from homes or using less noisy paddles and balls to mitigate the issue.
Acoustic experts reduce noise levels in a high-end salon, improving conversation ease and protecting employees' hearing. The successful solution can be applied to other salons, restaurants, stores, and conference centers to enhance clear communication and occupational safety.
A novel transparent ultrasonic transducer (TUT) developed by POSTECH researchers offers exceptional optical transparency and maintains acoustic performance, surpassing conventional limitations. This breakthrough enables high-depth-to-resolution ratios for ultrasound imaging, with applications in various medical devices and fields.
A novel bypass configuration eliminates temperature matching constraints, achieving energy flow field synergy and significantly improving efficiency. The system outperforms existing HDTRs, comparable to double-effect absorption refrigerators.
Researchers found that commercial ship noise completely masks Cook Inlet beluga whales' most commonly used calls, compromising their critical communication. The study documents the complex vocal repertoire of the population and provides a quantified measure of masking by ship noise on their communication.
The article discusses the importance of acoustic design in prison environments, where constant noise is harmful to both prisoners and staff. By incorporating speech intelligibility, strategic noise reduction, and privacy considerations, acoustic design can improve communication dynamics and alleviate negative social interactions.
A new proof-of-concept study demonstrates the use of distributed fiber optic sensing to detect and analyze the sound of periodical cicadas. The technology shows promise for charting the populations of these famously ephemeral bugs, with potential applications in monitoring insect abundance across seasons and years.
Researchers from Cornell University and University of Wisconsin-Madison developed a new audio technique to estimate the Spotted Owl population across the entire Sierra Nevada ecosystem. The analysis yielded an estimated 2,218 to 2,328 adult owls on federally managed lands, providing critical conservation baseline.
Researchers developed a microfluidic platform harnessing acoustic radiation force to manipulate droplets in air, achieving jump heights of up to 128mm. The platform allows for control over the direction and movement of droplets, enabling potential applications in scientific experiments and three-dimensional displays.
VIRTUOSO, developed by Dr. Hyunkook Lee from the University of Huddersfield's Applied Psychoacoustics Lab, enables immersive 3D audio without loudspeakers through binaural technology powered by ASPEN. This technology simulates the ambience and reflections found in a room with headphones, allowing for accurate translation to real speakers.
A laboratory study found that exposure to background traffic noise, even at 40 dB, significantly impairs concentration and perceived workload. Researchers also highlight the difficulties in avoiding high-frequency noise indoors due to reduced vehicle speeds.
A new study reveals that our perception of difficulty in shouting upwind is incorrect. It's not the wind itself that makes it hard, but rather our inability to hear ourselves due to the convective attenuation effect. The study found that sound carries better within the first 100 meters upwind, making it easier for others to hear us.
Great gray owls have a broad disc-like face that acts as radar to find food, while their facial features help correct for sonic distortions caused by snow. The owls' ability to hover above prey allows them to pinpoint location and avoid acoustic mirages created by the snow.
Researchers at the University of Technology Sydney have extended the theory of acoustic levitation to account for asymmetrical particles, which is more applicable to real-world experience. This new understanding enables precise control and sorting of tiny objects using ultrasonic waves.
Researchers have enhanced technology to lift small particles using sound waves, achieving stable lifting of particles from surfaces. By fine-tuning control using an adaptive algorithm, they have improved the stability of their 'acoustic tweezers' technology, which could be deployed in space and other environments with minimal contact.
Scientists at the University of Tsukuba have developed a theoretical model to describe the motion of ultrasound waves in liquids containing multiple bubbles, which may enable advances in diagnostic and therapeutic applications of ultrasound technology. The new equations can also be used to enhance microbubble-enhanced medical applicati...
A team of researchers from the University of Tsukuba has developed a new approach for accurate underwater acoustic positioning in multipath environments. By using a database of signals and selectively removing reflected waves, they achieve centimeter-scale accuracy in object location, even in shallow waters.
The Rule of Two method uses multiple measurements to collect reliable data, overcoming the limitations of single sine sweep techniques. This new approach will make it easier and faster to design rooms with optimal acoustic combinations, leading to better sound quality in various spaces.
Australian researchers have mapped the visual systems of hoverflies to detect drones' acoustic signatures, showing a 30-49% improvement in detection rates compared to traditional methods. The technology has potential applications for aviation safety and combatting IED-carrying drones.
Researchers developed a highly efficient wave-based acoustics simulation that can accurately estimate the acoustics of large-scale interior spaces. The method uses a time-domain Finite Element Method to consider frequency-dependent characteristics of sound absorption materials, enabling precise modeling and high-speed estimations.
University of Utah researchers measured 14 rock towers in Utah to predict their seismic stability. They used mathematics that describe built structures' resonance to create a dataset, allowing for predictions without climbing the towers.
Harvard researchers create first topological acoustic transistor, utilizing sound waves to control flow on and off. The device demonstrates scalable and controllable 'acoustic switches' with potential applications in efficient noise reduction, ultrasound imaging, and more.
The Seattle Space Needle renovation incorporated acoustic designs to limit sound transmission, enhancing visitor experience. Acoustic materials and effective reverberant sound control were selected for the observation levels and restaurant.
Researchers from The University of Tokyo Institute of Industrial Science have found that drones can be used as communication bases with underwater robotic devices (AUVs) for ocean surveys. UAVs offer high-speed observations, mobility, and resistance to ocean currents, making them suitable candidates for this application.
Researchers developed an attention-based deep neural network to detect multiple ship targets, exceeding conventional networks' performance. The model focused on inherent features of the two ships simultaneously, outperforming traditional approaches.