[Keynote Address] Status of Road Traffic Noise and Motor Vehicle Noise Regulation (tbc)

KEISUKE YAMAMOTO (Ministry of the Environment)

In this article, I would introduce the latest status of Road Traffic Noise. In addition, with regard to Motor Vehicle Noise Regulation, I would explain the history, the system and the status of addressing the issues to be addressed in the Future which was reported by "Future Policy for Motor Vehicle Noise Reduction (Fourth Report)" of Central Environmental Council.

The countermeasures for Phase3 of R51-03

Koji Kato･Yoshitaka Atsumi･Hidenori Morita･Masashi Komada (Toyota Motor)

UN Regulation No.51-03 was introduced from 2024 as phase3.The countermeasures for phase3 which is the most strict noise limit are explained.

Trends in road traffic noise criteria in EU countries

Kazunori Harada (Okayama Prefectural University)･Naoya Maruyama (Kumamoto University)･Yasuhiro Hiraguri (Kindai University)･Takuya Oshima (Niigata University)･Shinichi Sakamoto (The University of Tokyo)

To contribute to discussions on Japanese Environmental Quality Standards for noise, this study investigates trends in road traffic noise criteria in EU countries. Assessment indicators, legal binding force, and consistency with WHO guidelines were analyzed. The survey revealed that many countries apply different criteria for new versus existing roads. This presentation introduces the current status in Europe and discusses its implications for future standards in Japan.

Reduction of Tire Radiated Noise by Pattern Design Considering Tread Deformation during Rolling

HIroshi Fujii (THE YOKOHAMA RUBBER CO.,LTD.)･Fumihiko Kosaka (Dassault Systemes K.K.)

Band-pass filtering was applied to time-series data of tire coordinates in rolling simulations, revealing standing wave-like deformation in the tread ribs. Based on the interval of this deformation, lug groove arrangement was optimized to reduce radiated noise. This paper reports on the verification of these effects using simulation, as well as the results of confirmation through physical testing.

Evaluation Method of Annoyance due to Low-Frequency Noise from Large Vehicles

Makoto Morinaga (Daido University)･Shigenori Yokoshima (Kanagawa Environment Research Center / Kanagawa University)･Tetsuya Doi (Kobayasi Institute of Physical Research)･Akiko Sugahara (Kindai University)

To examine the effect of low-frequency sound generated by heavy vehicles on annoyance, a laboratory experiment using a paired comparison method was conducted. The results suggested that even when A-weighted sound pressure levels were equal, sounds containing more low-frequency components were perceived as more annoying. However, when loudness levels were equalized, the difference in annoyance between the presence and absence of low-frequency sound decreased.