Abstract: The outdoor pass-by noise tests of vehicles are subject to environmental factors, driving skill and test sites, and the international standard ISO 362—1∶2007 has more stringent requirements on outdoor pass-by noise tests, which makes the success rate of pass-by noise test is significantly reduced. In order to establish an efficient platform for pass-by noise tests, the indoor measurement methods for pass-by noise tests have become an urgent need. In view of the key problem of vehicle pass-by noise indoor measurement methods that there are differences between indoor and outdoor tyre/road noise in the pass-by noise tests, the experimental research on indoor and outdoor pass-by noise tests for a certain vehicle is carried out. Based on indoor coast-by method, the indoor tyre/road noise coefficients are obtained and the indoor tyre/road noise is extracted, which is then replaced by outdoor tyre/road noise based on the energy superposition principle of sound pressure. The absolute error between the indoor pass-by noise measurement result and outdoor measurement result is within ±1 dB(A) , which verifies the effectiveness of the method.

Key words: tyre/road noise, pass-by noise, indoor measurement, coast-by, replacement