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Noise Headlines and Top Story- Updated April 15, 2008
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* Agencies Face Challenges in Meeting Noise Reduction Goals
* Tacoma’s Updated Noise Control Ordinance Goes Into Force
* Airports Call for Discussion on Benefits of Going Beyond DNL 65
* Preferential Routing Urged for Quieter Aircraft
* New Noise Simulation Model Developed for the Military
* Helicopter Noise Study Conducted for Planned Medical Center
* Wayside Horns Silence Trains at Ten Sugar Land Crossings
* ACRP Projects Address NEPA and Noise Outside the DNL 65 Contour
* Last UK Noise-at-Work Regulations Enter into Effect This Month
* Schihol Airport Seeks Entries in Noise Barrier Design Competition
* Park Service Redefines 'Restoration of Natural Quiet'
* FAA Issues Guidance on Current Year AIP Funding
* Australia Sees Noise Benefits from RNP Flight Procedures
* UK Grapples with Impacts of Airspace Plan
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Model-Based Noise Monitoring
System Under Development
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Future methods of aircraft noise control should be based on a combination of continuous monitoring and advanced modeling, according to TNO, the Netherlands Organization for Applied Scientific Research. TNO is developing a system of model-based sensor networks that eventually will enable monitoring of noise and other environmental parameters.
“The basic idea is that pure data is often meaningless, and only by combining the data with calculation models can one draw meaningful conclusions,” according to TNO. “Eventually, such a combination of data and models may lead to a system that can be used both for providing information to the public and for noise mapping and enforcement of noise regulations.”
TNO is experimenting with a model-based sensor network south of Amsterdam Schiphol Airport, in the city of Aalsmeer. Currently, noise around Schiphol is continuously monitored, with sound levels displayed on a website without analysis or interpretation.
The method for drawing noise maps around the airport is based on a calculation model from the 1970s, according to TNO. “There is a lively debate in The Netherlands about changing to a new method based on a combination of calculation and measurement.”
Tool Developed
A team from the TNO acoustics department collected data for a set of aircraft departures, including noise spectra and flight, air pollution, and meteorological data, then combined it with modeled directional sound emissions calculations. They developed a tool to visualize the data and model results and also to enable analysis of relationships among noise levels at different positions, flight parameters, and air pollutants emitted by aircraft.
“The models yield noise levels at all positions around the airport runway--not only at the measurement positions--and noise contours for single flights and groups of flights,” according to TNO. “The tool clearly demonstrates the power of the combination of data and models.” Potential applications include short-term noise forecasts and scenario studies with different distributions of aircraft.
Copyright 2008 Great Circle Communications LLC. No unauthorized posting, forwarding, or any other form of transmission of this material, by any means, in whole or in part, is allowed.
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