Error Factor Analysis of Acceleration Noise in the Test of Iso R362 785097

A test method of ISO R362, internationally most recommended test standard, become serious problem for the regulation of vehicle's exterior noise in Japan. Accordingly, it is fundamentally important to research on the test errors caused by miscellaneous factors.

This paper deals with error analysis regarding two of the main factors of errors in the test of ISO R362, meter-reading error and driver's operating error. For the former case, the data population obtained by reading the sound pressure level meters is compared with the population obtained from the data instrumentally computed, and the statistical method of significance test is applied for the observation in detail. As the result, there is no evident significance between both populations, and the population of computed data, however, has rather great deviation in general.

For the later case, the several factors of errors resulted from the driver's operating behavior are observed through the method of multiple regression procedure. Four kinds of vehicles, a passenger car, a light truck, a middle truck and a heavy truck, are offered in the test. Analysis shows that the three kinds of errors, the deviation of cruising speed before acceleration, the deviation of acceleration point and the deviation from center line, will introduce the significant effect on the total error in the test of ISO R362