Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

PolyU researchers seek to calm noise on the road

17.03.2009
Working in collaboration with the government departments, researchers of The Hong Kong Polytechnic University are taking active steps to ease traffic noise generated from frictional contact between vehicle tyre and road surface.

According to the Principal Investigator Dr Hung Wing-tat, Associate Professor of PolyU's Department of Civil and Structural Engineering. The study is made possible with the set up of a sophisticated machine known as the Close-proximity (CPX) Trailer.

While traditional measurement of road traffic noise is done along the roadside, the CPX Trailer enables researchers to measure tyre-road noise on the road with its unique set up.

"The major merit of the CPX method is its ability to delineate the tyre-road noise from the background and thus enable engineers to fully assess the noise reduction effect of various types of low noise materials for road surfacing as well as low noise tyres," said Dr Hung, who is also Researcher of the University's Hong Kong Road Research Laboratory based in Whitehead of Ma On Shan.

The CPX Trailer was set up with initial funding support from the Environmental Conservation and Wheelock Green Fund. Towed by a four-wheel drive 2300 cc saloon car, the trailer contains an acoustic enclosure covering the test tyre and built in with a video-recording camera and two microphones. More importantly, this trailer is tailored to meet the stringent certification requirements of noise measurement and to run on narrow roads in urban areas of Hong Kong.

During the past three years, Dr Hung and his team have been using this CPX Trailer to collect valuable data on tyre-road noise in 66 road sections of the territory - very often in the middle of the night. They have reviewed massive data and examined the effects of different factors including driving speed; type of road surface; polymer modified surface; aggregate size and layer thickness; and the choice of tyre on tyre-road noise.

Their study found that tyre-road noise level increases significantly (over 3dB) when the vehicle speed increases from 50 km/hr to 70 km/hr. They also found that the smaller the stone size on road surface and the thicker the layer, the quieter is the road surface at low speed driving (with a difference of 6 dB at 50km/hr). At a reference speed of 70 km/hr, concrete road is the nosiest. The total volume of air void in the pavement surfacing also appears to have an impact on noise reduction.

According to EPD statistics, more than one million Hong Kong people are irritated by road traffic noise of over 70 dB per hour. In the next stage of study, PolyU has been further supported by a HK$1.77 million grant from the Environment and Conservation Fund to develop a new, fully automated CPX vehicle to upgrade the existing Trailer in measuring tyre-road noise. PolyU researchers will also probe the effectiveness of low noise tyre and the resurfacing of low noise surfacing materials at the same time.

The University will be conducting a series of territory-wide road tests to identify low noise road surfaces and tyres in collaboration with the Highways Department and EPD after the newly design CPX vehicle has been fitted and set up to satisfy all related ISO certification requirements.

Evelyn Chan | ResearchSEA
Further information:
http://www.polyu.edu.hk/
http://www.researchsea.com

More articles from Transportation and Logistics:

nachricht Researchers 'count cars' -- literally -- to find a better way to control heavy traffic
10.08.2017 | Florida Atlantic University

nachricht From parking garage to smart multi-purpose garage
19.07.2017 | Fraunhofer-Institut für Arbeitswirtschaft und Organisation IAO

All articles from Transportation and Logistics >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

Im Focus: Scientists improve forecast of increasing hazard on Ecuadorian volcano

Researchers from the University of Miami (UM) Rosenstiel School of Marine and Atmospheric Science, the Italian Space Agency (ASI), and the Instituto Geofisico--Escuela Politecnica Nacional (IGEPN) of Ecuador, showed an increasing volcanic danger on Cotopaxi in Ecuador using a powerful technique known as Interferometric Synthetic Aperture Radar (InSAR).

The Andes region in which Cotopaxi volcano is located is known to contain some of the world's most serious volcanic hazard. A mid- to large-size eruption has...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

New thruster design increases efficiency for future spaceflight

16.08.2017 | Physics and Astronomy

Transporting spin: A graphene and boron nitride heterostructure creates large spin signals

16.08.2017 | Materials Sciences

A new method for the 3-D printing of living tissues

16.08.2017 | Interdisciplinary Research

VideoLinks
B2B-VideoLinks
More VideoLinks >>>