2013 Session: ADC40

• Dynamic Simulation of Traffic Noise by Applying Ray Tracing Method based on Indoor Space Partitioning
  Abstract: This study presents a revised 3D ray tracing method by combining with indoor space partitioning. This method divides an entire indoor space into limited convex polyhedron subspaces, and thus reduces the number of surfaces intersected with rays, and omits the validity test of the collision point on the reflecting surfaces. Combining with a microscopic traffic simulation tool and a vehicle noise emission model, and taking the influence of diffraction into account, the method can be utilized in simulating dynamically the process of traffic noise diffusing inside the building through windows. Meanwhile, this study selects two different types of indoor architectural layouts in order to demonstrate the efficiency of this method, the influence of diffraction and of the state of windows, and the differences in indoor noise on different floors. A comparison study on before-and-after indoor space partitioning shows that the method is efficient.
  Authors: Chen, Zhi-bin; Cai, Ming; Li, Feng; Ye, Wei-jia
  Authors: Chen, Zhi-bin; Cai, Ming; Li, Feng; Ye, Wei-jia
  Year: 2013
  Document Type: Paper
  Subject: Environment
  Session: ADC40
  Paper Number: 13-0959
• Modelling the Tyre/Road Noise from Thin Layer Surfacings
  Abstract: Noise levels caused by road traffic have reached intolerable high levels in and around many urban areas all around the world. Because of health and general wellbeing related reasons, these noise levels have to be reduced. The noise produced at the tyre/road surface interface is one of the most important contributions to the overall traffic noise. Therefore noise reducing pavements are considered as solutions for noise level reduction in that interface. A thin layer asphalt surfacing is a commonly used noise reducing pavement technology in the Netherlands. In a previous project, trail sections of thin layer surfacings were built, and measurements of surface characteristics and tyre/road noise have been performed. This study is based on the analysis of the existing database. The noise levels on thin layer surfaces are investigated with different material properties and surface characteristics, including texture and sound absorption. It was found that differences in the mixture compositions and surface characteristics influence changes in noise levels.Based on these findings, regression based statistical models were developed for evaluating the tyre/road noise level caused by the road surface properties. Different combinations of the mixture compositions and surface characteristics were taken into account. The models developed in this study show great prediction effect and can be used for predicting the tyre/road noise generation in road engineering.
  Authors: Li, Mingliang; van Keulen, Wim; Ceylan, Halil; van de Ven, Martin F. C.; Molenaar, André
  Authors: Li, Mingliang; van Keulen, Wim; Ceylan, Halil; van de Ven, Martin F. C.; Molenaar, André
  Year: 2013
  Document Type: Paper
  Subject: Environment
  Session: ADC40
  Paper Number: 13-2847
• Past Experience with Green Noise Barriers
  Abstract: A green noise barrier is a noise barrier that utilizes soil and vegetation to mitigate traffic noise. This paper provides an overview of available green noise barriers along with a summary of their advantages and limitations. It addition, it presents case studies documenting the past experience of several highway agencies with green noise barriers. This information was obtained form a questionnaire that was sent out to more than three hundred national and international experts in traffic noise analysis and abatement. This paper also provides a series of conclusions and recommendations regarding the implementation of green noise barriers.
  Authors: Abbas, Ala Rebhi; Frankhouser, Andrew; Cubick, Karel; Liang, Robert; Cardina, John
  Authors: Abbas, Ala Rebhi; Frankhouser, Andrew; Cubick, Karel; Liang, Robert; Cardina, John
  Year: 2013
  Document Type: Paper
  Subject: Environment
  Session: ADC40
  Paper Number: 13-2154
  Practice-Ready: Yes
• Effect of Air Temperature and Vehicle Speed on Tire/Pavement Noise Measured with On-Board Sound Intensity Methodology
  Abstract: The objective of this paper is to show the variability of tire/pavement noise measured with the On-Board Sound Intensity (OBSI) method under different environmental conditions and vehicle speeds.Temperatures ranging from 40 to 90°F and speeds in the range in which tire/pavement noise becomes predominant for the overall vehicle noise were tested. The selected speeds were: 35, 45, and 60 mph. The paper presents a brief literature review identifying the gaps of knowledge about the effects of different variables (e.g., environment, vehicle speed) on tire/pavement noise. It presents a summary of different technologies used to determine noise measurements and introduces the OBSI methodology, its standards, and provides an overview of the system and software used for data acquisition. A series of seasonal field tests were conducted on a primary road in Virginia over several months. The results were analyzed to quantify the variation of tire/pavement noise with respect to the test temperature and speed. Findings confirm the previously observed trend that tire/pavement noise slightly decreases as air temperature increases. The model shows a gradient of approximately -0.05 dBA/°F. Regarding the influence of vehicle speed, the results showed that for the surface studied tire/pavement noise increases an average of 2.5 dBA for every 10 mph of increased speed.
  Authors: Mogrovejo, Daniel; Flintsch, Gerardo W.; de León Izeppi, Edgar David; McGhee, Kevin Kenneth
  Authors: Mogrovejo, Daniel; Flintsch, Gerardo W.; de León Izeppi, Edgar David; McGhee, Kevin Kenneth
  Year: 2013
  Document Type: Paper
  Subject: Environment
  Session: ADC40
  Paper Number: 13-3765
  Practice-Ready: Yes
• Dynamic Simulation of Traffic Noise by Applying Ray Tracing Method based on Indoor Space Partitioning
  Authors: Chen, Zhi-bin
  Authors: Chen, Zhi-bin
  Year: 2013
  Document Type: Presentation
  Session: ADC40
  Paper Number: 13-0959
• Modelling the Tyre/Road Noise from Thin Layer Surfacings
  Authors: Li, Mingliang
  Authors: Li, Mingliang
  Year: 2013
  Document Type: Presentation
  Session: ADC40
  Paper Number: 13-2847
• Effect of Air Temperature and Vehicle Speed on Tire/Pavement Noise Measured with On-Board Sound Intensity Methodology
  Authors: Mogrovejo, Daniel
  Authors: Mogrovejo, Daniel
  Year: 2013
  Document Type: Presentation
  Session: ADC40
  Paper Number: 13-3765