Electromagnetic Simulation Method of a Vehicle Tire Equipped with Carcass
Nguyen Quoc Dinh*, Takashi Teranishi*, Naobumi Michishita*, Yoshihide Yamada* and Koji Nakatani**
* Department of Electrical and Electronic Engineering, National Defense Academy, JAPAN **The Yokohama Rubber Co., Ltd., JAPAN
In order to ensure driving safety, the tire pressure monitoring system named AIRwatch system has been developed by The Yokohama Rubber Co.,Ltd. Air pressure data of four tires are transmitted by small loop antennas mounted in the tires at the frequency of 315MHz. In the case of large vehicles, tires are reinforced by carcass. Here, radio wave emissions from tires meet a very severe condition. In this paper, electromagnetic simulation method for a carcass tire is clarified. In order to ensure simulation adequateness of carcass effects, electric field distributions in a tire are compared with those of a coaxial cylindrical resonator. When the carcass is composed very densely, both electric field distributions agree well. As for radiation intensity through the carcass tire, the level decrease well corresponds to the theoretical value of a grid structure. Therefore, the adequateness of carcass simulation method is ensured. Moreover, calculation adequateness of a tire rubber is investigated. Sufficient mesh size of dielectric plates modeled as tire rubber is clarified by estimating transmission characteristics through a dielectric plate. Simulation results of electric field distributions in a tire and radiation characteristics are shown.
26th Annual Review of Progress in Applied Computational Electromagnetics
2010
April
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