Geometry.Net - Science: Active Noise Control

Airline Cockpit Noise-Pilot Hearing Loss
Links to Other noise Information ALPA ANR Headset Study active noise ReductionFAQ Institute of noise control Engineering Lord Corp.; ANR for DC9/MD-80
http://cockpitnoise.webhop.org/

Extractions: Airline Cockpit Noise Introduction Many airline jet aircraft have high cockpit noise levels . Noisy cockpits make communication between pilots difficult, increasing the potential for error. Pilots in noisy jet cockpits may not hear important instructions from ATC. Loud cockpits could prevent pilots from hearing warning or alert sounds. Aircraft could be lost because a pilot could not hear ATC, a fellow crewmember, or a warning sound from an aircraft system, sounds that could be masked by high cockpit noise levels. Pilots are at risk of hearing damage and loss due to noisy jet cockpits. Because of high ambient noise levels, pilots must turn radio volume levels up to hear ATC communications, further endangering their hearing. Discomfort caused by increased noise at higher jet speeds may cause pilots to disregard Flight Management System (FMS) recommended airspeeds in favor of slower, quieter airspeeds. Air conditioning subsystems may be turned off by pilots seeking quieter cockpits, reducing passenger comfort. In the U.S., Federal Law prohibits the Occupational Safety and Health Administration (OSHA) from regulating pilot noise exposure, reserving that authority for the FAA. Because the FAA has chosen not to regulate cockpit noise, pilots are legally exposed to dangerous levels of noise in their workplace. In contrast, the FAA has chosen to regulate the noise exposure of its own employees. Under the
Active Noise And Vibration Control
noise barriers etc. All these passive means are mostly suitable for high frequenciesand have various disadvantages. In the last decade, active control of
http://www.ee.ethz.ch/research/control/anc.en.html

Extractions: Fig. 2: Experimental set-up. Traditionally, noise was reduced by passive means like mufflers, damping plates, sound absorbing materials, double-glazing windows, noise barriers etc. All these passive means are mostly suitable for high frequencies and have various disadvantages. In the last decade, active control of sound and vibration (at audio frequencies) has emerged as a viable technology to bridge the low-frequency technology gap. Fig. 3: Control speaker in the cavity between the panes. The goal of this study is to increase the sound transmission loss through a double wall panel in the mass-air-mass resonance frequency range by active control of the sound field inside the panel cavity (Fig. 1 and 2). First, the structural modal behaviour of the two panels, as well as the acoustic mode shapes in the cavity between the panels are identified. Then a robust feedback control system that increases the panels transmission loss is designed and implemented. As actuators, two loudspeakers in the cavity between the panels are used, which control the pressure field such that the radiated sound power from the sending panel is minimised (Fig. 3). For the sensing, a novel concept is introduced that is based on measurements inside the cavity only. No microphones in the sending or receiving room are necessary. The experimental results show that the designed control system can significantly improve the sound transmission loss in the desired frequency range.
Active Control
active Structures and noise control Technical Group. The mission ofthe active Structures and noise control Technical Group is to
http://kirkof.psu.edu/active.html
RCOE Research
active control of Cabin noise PowerPoint Presentation. Development of a Smart SteerableAntennae for Wireless Rotor control, Sensing, and AntiIcing Systems
http://www.psu.edu/dept/rcoe/research.htm
Noise Control And Noise Cancellation
Index Presentation Title, Name, Organization. Some New Developments in ActiveNoise control, Felix Rosenthal, Signal Separation Technologies, Inc.
http://www.darpa.mil/MTO/sono/noisecontol.html

Extractions: Noise Control and Noise Cancellation The following presentations are in .PDF format. To view and print the presentations, you may need to download and install free externallink('www.adobe.com/prodindex/acrobat/readstep.html','Adobe Acrobat Reader') software. This one-time-only process will take about 10-15 minutes. After Adobe Acrobat Reader has been downloaded and installed, you will be able to view and print any .PDF file. Click here to go to the externallink('www.adobe.com/prodindex/acrobat/readstep.html','Adobe Acrobat Reader') page. Index tabletop('534364','3','600','left','6'); Presentation Title Name Organization Some New Developments in Active Noise Control Felix Rosenthal Signal Separation Technologies, Inc.
What We Do: Acoustic Technologies: Active & Passive Sound And Vibration Control
Our QuietZone is an example of our expertise in building advanced activenoise control systems that must operate in very specific constraints.
http://www.bbn.com/acoustic/apsvc.html

Extractions: BBN has worked in the Active Sound and Vibration Control (ASVC) field since 1967. We offer ASVC design and development services, provide ASVC components, and integrate ASVC systems to solve application-specific, complex noise and vibration problems. In addition to our research studies and laboratory experiments, we design and implement sophisticated advanced technology demonstration systems and produce operational ASVC systems for specific applications. Our expertise in control theory, digital signal processing, computer hardware design, software development, and structural and airborne acoustics enables us to produce high-performance broadband and narrowband feedback or feedforward systems for sound or vibration cancellation. We design and build all system components, including sensors, electromagnetic actuators, and digital controllers. Our QuietZone is an example of our expertise in building advanced active noise control systems that must operate in very specific constraints.
Campanella Associates (Acoustics Consultants)
reduction by design and testing; seismic (dynamic and stress) analysis of nuclearpower plant components; surveys and reporting; noise control design; expert
http://www.campanellaacoustics.com/default.htm

Extractions: The science of acoustics provides the only reliable way to measure, analyze and control sound. Unwanted sound (noise) from our everyday environment can be annoying or damaging because our hearing sense cannot be turned off. Modern society unintentionally produces large quantities of noise through transportation, manufacturing and recreational activities. Campanella Associates is dedicated to making the home, work, institutional and recreational environments pleasant and safe. As acoustical engineers, we provide our clients with effective methods to reduce or eliminate noise. Campanella Associates can do any of the following: acoustical design and noise isolation testing of auditoriums, churches, recording and TV studios, apartments, residential units, and open-plan offices; computer modeling of airport, highway, and railroad noise for master plans; cabin interior noise and vibration reduction by design and testing; seismic (dynamic and stress) analysis of nuclear power plant components; surveys and reporting; noise control design; expert witness testimony. Have done extensive noise and vibration testing for OSHA, Leq, DNL, IIC, and seismic mitigation recommendations for FAA, FHA and HUD compliance. Campanella Associates has a very extensive client listing Participate in joint ventures, and have
Research Groups In The ISVR, Fluid Dynamics And Acoustics,Dynamics, Hearing And
Human Factors Research Unit. Signal Processing and control Group. active Noisecontrol. active Vibration control. Signal Processing for Underwater Systems.
http://www.isvr.soton.ac.uk/Jan2000/research.htm

Extractions: TEACHING and COURSES TECHNOLOGY TRANSFER TO INDUSTRY The ISVR is a centre for postgraduate and postdoctoral research carried out in four groups: Dynamics Group Active Control and Smart Structures Automotive Noise and Vibration Dynamic modelling High Frequency Vibrations Railway noise and vibration Fluid Dynamics and Acoustics Group Virtual Acoustics Project University Technology Centre in Gas Turbine Noise Aeroacoustics and Nonlinear Acoustics Electroacoustics Vibroacoustics Bioacoustics and Biomechanics Hydroacoustics and Underwater Acoustics Human Sciences Group Hearing and Balance Centre South of England Cochlear Implant Centre Human Factors Research Unit Signal Processing and Control Group ... Active Noise Control Active Vibration Control Signal Processing for Underwater Systems Non-stationary Processes and Non-linear Systems Real Time Signal Processing Biomedical Signal Processing PhD European Doctorate in Sound and Vibration Studies (EDSVS)
TechOps Technologies
These annoyances may no longer disturb your work and pleasure time thanks to activenoise control technology developed by researchers at NASA Langley Research
http://www.nttc.edu/techmart/technology.asp?technology_id=131
Acoustics Faculty Gerald C. Lauchle
RS McGuinn, GC Lauchle, DC Swanson. Turbulence Suppression for an active NoiseControl Microphone Placed in a Flowfield, Proc. 2nd AIAA/CEAS Aeroacoust.
http://www.acs.psu.edu/Faculty/LauchleG.html
Presentations
Papers and Presentations. Some papers and slides of recent presentationsgiven by VAL members are presented here. Warning No part
http://www.val.me.vt.edu/Presentations/presentations.html

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