Nippon Expressway’s rapid road noise reduction
7 June 2012
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Brüel & Kjær’s beamforming solution drives down traffic noise
Tokyo-based Nippon Expressway Research Institute Company (NEXCO RI) has optimised its work on reducing environmental road noise for residents with Noise Scope - a customised beamforming tool.
Created by sound and vibration expert Brüel & Kjær, Noise Scope is a part of the company’s data analysis platform PULSE, and it consists of a customised 3-metre diameter, 42-channel, seven-armed array (each arm measuring 1.5m in length) and a 48-channel PULSE IDAe frame.
Noise Scope measures sound in places affected by road noise such as residential areas, bridges, intersections, junctions, tunnels and motorway toll-booths, allowing NEXCO-RI to optimise the design and construction of highways and their facilities – in order to reduce the adverse effects of high-density traffic.
Mr. Toshikazu Osafune, Acting Division Chief, Traffic and Environmental Research Department, says: “As traffic density cannot be reduced, we need to find solutions to reduce noise at barriers, bridges and intersections. This is where Noise Scope comes in. The volume of one day’s data contains so much information that it can represent between one and two weeks of post-processing.”
Mr. Osafune continues: “We measure over a frequency range between 300Hz and 2 kHz. Within this range, the resolution of Noise Scope is excellent, even at distances of up to one hundred metres. We expect Brüel & Kjær to continue development so that we can measure down to 100Hz in the future. This is our aim and future goal. One great feature of the system is the ability to take a quick look in real-time to evaluate the overall noise levels and to check system integration and correct working.”
More information about Brüel & Kjær’s PULSE array systems is available at: www.bksv.com/beamforming
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