Articles tagged with Vibration
Nayfeh has made significant contributions to the field of nonlinear dynamics, including developing a new methodology for controlling ship motions and analyzing acoustic waves in aircraft engine-duct systems. His work has improved the understanding of complex phenomena such as subharmonic and superharmonic resonances in ships and boats.
Physicists at UC Berkeley have successfully produced a quantum whistle in superfluid helium-4 using an array of tiny holes. The whistle is achieved at a temperature of 2 Kelvin, making the sensors user-friendly for scientists unfamiliar with cryogenic technology.
Researchers developed carbon nanotube-based composite materials to maximize frictional damping in mechanical systems. The findings show that these materials can effectively reduce vibration and energy dissipation, making them a promising solution for various applications.
Carbon nanotubes' electronic and mechanical properties are highly dependent on the presence of defects, which alter their vibrational modes and affect electrical conductivity and heat transport. The study demonstrates the importance of understanding these effects for optimizing nanoscale devices.
Researchers studied vibrational energy flow through a water-surfactant-organic solvent system, finding that the shape of molecules plays a crucial role in heat transfer. The study reveals that different excitations travel along different paths and rates, leading to significantly longer energy transfer times.
Researchers at Cornell University have created a tiny oscillator that uses a carbon nanotube to vibrate at radio frequencies, enabling mass sensing and gas detection capabilities. The device is so small that it can potentially weigh individual atoms, offering new possibilities for scientific research and applications.
Researchers at Purdue University are developing a system to continuously monitor heat panels on future spacecraft for subtle damage, which could lead to accidents if left undetected. The system uses vibration and sound measurements to detect damage in real-time, making it ideal for periods of highest stress during takeoff and reentry.
Researchers at Penn State found lags between the changes in forces and strength in laboratory simulations, with delays ranging from seconds to weeks after initial earthquakes. The study suggests a competition between compaction and dilation of granules in gouge zones contributes to delayed fault movements.
Researchers use nanoelectromechanical systems to detect masses as small as 6 attograms, a third of the mass of a typical virus. The technology has potential for detecting and identifying microorganisms and biological molecules.
Researchers refute vibration theory by finding shape of odor molecules crucial for distinct smells. The study's results support the prevailing 'shape theory', which suggests that chemical shape is the primary factor in determining a substance's scent.
Researchers found that the lifetime of water's OH-stretch vibration increases with temperature, weakening hydrogen bonds and allowing molecules to vibrate longer. The study used ultrafast infrared lasers to measure the number of vibrating molecules, revealing a unique property of water.
University of Central Florida researchers are testing a new way to communicate with soldiers through vibrations, aiming to reduce distractions and improve safety. The study, funded by the U.S. Department of Defense, explores whether coded vibrations can be an effective alternative to traditional communication methods.
MESSENGER, NASA's first Mercury orbiter mission, is set to begin prelaunch tests at Goddard Space Flight Center. The spacecraft will undergo environmental testing and shake-and-bake tests to prepare it for its May 2004 launch and a yearlong study of Mercury.
A recent study by Margolis and Shim found that a small movement of the mechanical controls in backhoes can lead to rapid vibration, causing operators to lose control. The problem can be eliminated by stiffening the suspension of the cab or developing automatic control systems.
Researchers at Georgia Institute of Technology have developed a solution to stop noisy brakes once and for all. The new system uses a simple piezoceramic actuator to apply bursts of a 'dithering' frequency, suppressing vibrations that cause squeal.
Researchers at Purdue University have developed a new diagnostic method that uses a vibration-based technique to test the structural integrity of composite military materials. The method can detect damage caused by small impacts and has been shown to be sensitive enough to detect damage even in areas where other techniques cannot.
Scientists have developed a way to measure protein flexibility using lasers, revealing a dynamic process in antibody-antigen recognition. The technique allows for the detection of rapid molecular motions, suggesting that antigen recognition may not be a simple lock-and-key mechanism.
Researchers at Purdue University have developed a simple alternative to complex mathematical models for analyzing car designs. The new technique can pinpoint design flaws more accurately and diagnose problems within days, compared to months, by using vibration measurements.
Researchers developed a new circuit that harnesses vibrations to generate up to 50 milliwatts of power, surpassing the output of simple energy harvesting circuits. The adaptive piezoelectric energy harvesting circuit can be used in various applications, including wearable devices, sensor networks, and smart home security systems.
Researchers at Ohio State University have developed an ultrasonic cleaning technique that can clean ceramic membrane filters without the need for harsh chemicals. The method uses sound waves to form and collapse bubbles, releasing heat and energy that flushes away contaminants.
Ohio State University engineers designed a generic pipe adapter to diagnose and eliminate whistle noise in vehicle engines. The adapter reduces sound levels by up to 30 decibels, saving automakers time and money.
The MIT team's X-Cell 60 model rotorcraft performed a 360-degree aileron roll autonomously, marking the first-ever achievement in its kind. The helicopter's small size and low cost make it an attractive option for military reconnaissance or aerial filming.
Researchers found that deaf people's brains process vibrations in the same part of the brain as sound, leading to a similar musical experience. This discovery challenges the long-held belief that brains are hardwired at birth and instead shows that our genes provide a developmental strategy for brain organization.
Researchers Weaver and Lobkis developed a technique to measure the vibrations of an object's interior by analyzing ambient noise. By correlating patterns in the noise, they can extract information about the object's internal structure, offering new possibilities for non-invasive inspection and monitoring.
Dr. Linda M. Hanagan's innovative approach uses active control systems to dampen vibrations in existing buildings, reducing costs and time required compared to traditional stiffening or thickening methods. The system can be applied quickly, often taking less than a week to fix the problem.
Researchers at Purdue University have created a mathematical model to analyze tire vibrations and identify the components that produce the most noise. The model, which creates a visual representation of the tire's vibration pattern like a fingerprint, will help engineers design quieter tires and reduce highway noise.
Researchers have made a breakthrough in understanding a perovskite-related oxide with an extremely high dielectric constant, which remains stable over a wide temperature range. The material's unique property is attributed to the rearrangement of atomic charges without structural distortion.
Researchers at Virginia Tech have developed mathematical formulas to reduce vibrations on spacecraft, enabling autonomous decision-making without human programming. The technology will be tested on the International Space Station, which is currently under construction with a budget of $50 billion and expected completion in five years.
Researchers at the University of Illinois have developed a multidimensional technique that enhances vibrational spectroscopy, allowing for unprecedented detail in studying molecular vibrations. This new method enables femtosecond-resolved snapshots of molecular motions, providing insights into the fundamental mechanics of molecules.
Researchers at Ohio State University found that pilots can detect changes in automation status more effectively when receiving vibrations than visual cues. The study suggests that tactile feedback could be a powerful tool for human-machine communication in various domains, including aviation, healthcare, and space exploration.
Research shows that smoking exacerbates circulatory problems caused by vibration white finger, a condition affecting workers who use pneumatic tools. Smokers are twice as likely to experience severe symptoms of vasoconstriction compared to non-smokers.
The physics of baseball involves understanding various phenomena such as the break of a curve ball, the flight of a home run, and the impact between bat and ball. The collision is highly inelastic, resulting in lost kinetic energy due to frictional heat and reaction forces that affect the bat's recoil.
Researchers have developed a new technique called Doubly Vibrationally Enhanced (DOVE) Four Wave Mixing, which uses two infrared lasers to study molecular connections and vibrations. This method allows chemists to gain insights into complex scientific problems, such as bacterial resistance to antibiotics and soil weathering.
A team of scientists will conduct seismic experiments along a 600-mile route, using specialized instruments and explosions to create detailed profiles of the Earth's crust. The project aims to gain insight into the formation of the Rockies and improve knowledge of earthquake hazards, natural resources, and water resources.
The Active Tuned Mass Absorber (ATMA) system reduces propeller-induced sound in turbo-prop aircraft, improving passenger comfort and enhancing military surveillance. With over 200 units installed on DC-9 and MD-80 aircraft, ATMA has proven effective in reducing interior noise levels by up to 90%.
Researchers at Cornell University have created a nanoharp to study the physics of very small vibrating systems. The device consists of silicon rods suspended above a substrate and measures vibrations using laser light, detecting frequencies up to 380 MHz.
A new imaging device, Hall Effect Imaging (HEI), uses ultrasonic emissions to highlight variations in electrical conductivity between healthy and diseased tissue, offering a faster alternative to painful biopsies. HEI has high specificity, ruling out false positives, and could complement MRI technology.
The INEEL Laser Ultrasonic Camera transforms sound waves into an image, revealing object thickness, stiffness and imperfections. The system's dynamic holographic image shows waves moving along the surface of the entire object in real-time.
The Aurex-3 device uses a vibrating probe to cancel out ringing sounds in the ear, offering long-term benefits without interfering with hearing. Developed by ADM Tronics, the device employs beat harmonics to effectively mask tinnitus symptoms.
Researchers use storage ring to study molecular recombination process, revealing need for further theoretical work to understand influence of vibrational excitation. The experiment demonstrates the importance of vibrational motion in dissociative recombination and guides future quantum chemistry calculations.
A team of Cornell University physicists successfully measured the frequency of atomic vibrations in a single molecule of acetylene, providing a new way to identify and study molecular bonds. This technique, called vibrational microscopy, has potential applications in understanding catalysts and biological molecules like DNA.
Researchers used low-energy helium atom scattering to study the topmost layer of ice, finding that water molecules vibrate strongly, causing a coherent diffraction pattern to be elusive. The results explain why ice is slippery, adheres to other ice surfaces, and traps molecules in the stratosphere, leading to ozone depletion.
Scientists use sensors to measure the intensity of vibrations at different frequencies, optimizing experiments for the US Microgravity Payload. By analyzing data from past missions, they can plan future ones more effectively and minimize disturbances.
A Colorado State University study has found that exposure to high-frequency vibrations can increase bone density in female sheep by up to 3% over a one-year period. This promising treatment may be an ideal alternative for older, less active women with osteoporosis.
Researchers have developed a two-part seismic device that can detect ground vibrations given off by an approaching tornado, allowing users to seek shelter. The 'sensor' portion of the device is designed to be affordable for everyone and can provide up to five minutes warning before a tornado strikes.
Researchers have developed a new theory that can pinpoint more black hole candidates in distant space by analyzing data from the NASA Rossi X-ray Timing Explorer satellite. The team used this approach to identify a black hole candidate at GRS 1915+105, suggesting that others may exist before the year is out.
Scientists detect unique X-ray vibrations in black hole candidate GRS 1915+105, potentially revealing its mass and rotation rate. The discovery is consistent with predictions made by the Stanford astrophysics group three years ago.