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 Laser rescue system for serious accidents
29.11.2016 | Laser Zentrum Hannover e.V.

nachricht Bremen University students reach the final at robotics competition with parcel delivery robot
19.10.2016 | BIBA - Bremer Institut für Produktion und Logistik

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: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

Im Focus: MADMAX: Max Planck Institute for Physics takes up axion research

The Max Planck Institute for Physics (MPP) is opening up a new research field. A workshop from November 21 - 22, 2016 will mark the start of activities for an innovative axion experiment. Axions are still only purely hypothetical particles. Their detection could solve two fundamental problems in particle physics: What dark matter consists of and why it has not yet been possible to directly observe a CP violation for the strong interaction.

The “MADMAX” project is the MPP’s commitment to axion research. Axions are so far only a theoretical prediction and are difficult to detect: on the one hand,...

Im Focus: Molecules change shape when wet

Broadband rotational spectroscopy unravels structural reshaping of isolated molecules in the gas phase to accommodate water

In two recent publications in the Journal of Chemical Physics and in the Journal of Physical Chemistry Letters, researchers around Melanie Schnell from the Max...

Im Focus: Fraunhofer ISE Develops Highly Compact, High Frequency DC/DC Converter for Aviation

The efficiency of power electronic systems is not solely dependent on electrical efficiency but also on weight, for example, in mobile systems. When the weight of relevant components and devices in airplanes, for instance, is reduced, fuel savings can be achieved and correspondingly greenhouse gas emissions decreased. New materials and components based on gallium nitride (GaN) can help to reduce weight and increase the efficiency. With these new materials, power electronic switches can be operated at higher switching frequency, resulting in higher power density and lower material costs.

Researchers at the Fraunhofer Institute for Solar Energy Systems ISE together with partners have investigated how these materials can be used to make power...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

UTSA study describes new minimally invasive device to treat cancer and other illnesses

02.12.2016 | Medical Engineering

Plasma-zapping process could yield trans fat-free soybean oil product

02.12.2016 | Agricultural and Forestry Science

What do Netflix, Google and planetary systems have in common?

02.12.2016 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>