UNCERTAINTIES IN INTERIOR NOISE MEASUREMENTS

초록

Reproducibility of test results is very important when noise measurement tests are carried out in order to determine the performance of a product. One of the examples is the interior noise measurement of a railway vehicle, which is required as a part of a quality test or a site acceptance test. The conditions for the measurement of the interior noise are usually defined in the contract and they are based on the international standards. The interior noise level depends not only on the running conditions but also on the other factors such as track conditions, vehicle conditions, and environmental conditions. Therefore, the test conditions should be controlled strictly to obtain reliable results. However, if there is any restriction in the test environment, reliability of the measurement results may become questionable. In this study, the test procedure for the interior noise measurement of Korean high-speed trains has been reviewed and investigated with the reference of international standards. Measurement results have been analyzed to investigate the influence of the different conditions on the interior noise level. During the process of the site acceptance test it was unable to satisfy some of the requirements for the noise test, hence, acceptable tolerance is suggested to take account for the factors that influence the interior noise of the Korean high-speed trains