The objective of this paper is to compare the site-to-site variability of ISO 10844 pass by the noise test sites. In order to investigate the site-to-site variance of test surfaces, European commercial tires are tested at seven different test sites. Three Korea test sites and four Europe test sites are selected. The pass by noise test is done according to a 2001/43/EC regulation. Although the ISO surface has a very specific track composition, it does not reduce the variation of pass by noise measurements over the surface of test sites. This paper shows that the test results of pass by noise level are different depending on the test sites. The correlation obtained in this work is able to predict the pass by noise level for certain test site using the data measured from another test site. The prediction value is range with an error within 1dB(A).

Abstract
 1. Introduction
 2. Measurement Equipment and Method of Pass by Noise
  2.1 Test Surfaces (ISO 10844)
  2.2 Measurement Setup and Test Tires
  2.3 Test Method and Condition
 3. MEASURED RESULTS AND ANALYSIS
  3.1 Determination of the Pass by Noise Level
  3.2 Result Analysis
 4. Conclusions
 References

• Byoung-Sam Kim(Wonkwang University, Division of Mechanical and Automotive Engineering) Corresponding Author