TECHNICAL NOTE - EVALUATION OF A RE-ANALYSIS OF THE RELATIONSHIP BETWEEN THE RESULTS OBTAINED IN LABORATORY AND FIELD STUDIES ON THE ANNOYANCE CAUSED BY HIGH-ENERGY IMPULSIVE SOUNDS

摘要

In 1994, Schemer [Noise Control Eng. J. 42(5), 179-191 (3.994)] showed that the annoyance caused by high-energy impulsive sound increases more rapidly with sound level than does the annoyance caused by vehicle passby sound, and he proposed a new method for assessment of this impulsive sound, The National Research Council (NRC) has reported on the assessment of high-energy impulsive sound, and it has included the method proposed by Schemer as one of two recommended methods, This method has been incorporated into a new American National Standard, The method is based primarily on field-laboratory studies, and it uses a non-constant adjustment that is made to the sound exposure level (SEL), not to the equivalent level, Because this new method represented quite a departure from traditional practice, many sources of relevant data in addition to the field-laboratory data were examined, These sources included an approximate re-analysis of old attitudinal survey data from Ft, Bragg and Ft, Lewis for which the original operational data were lost. The purpose in using these approximate attitudinal survey data was to show that a non-constant adjustment to SEL also was plausible on the basis of just those attitudinal survey data, Vos has used these approximate attitudinal survey data as absolute and has developed a revised means to relate blast sounds to equivalently annoying wheeled vehicle sounds, This paper examines the analysis by Vos [Noise Control Eng, J. 45(3), 123-131 (1997)] and provides alternative interpretations to his analysis, It shows that Vos's analysis inappropriately treats approximate data as exact and absolute, Further, Vos's analysis uses populations where the percent highly annoyed is very small and hence, less stable, and it ignores some of the attitudinal survey data. (C) 1997 Institute of Noise Control Engineering. [References: 12]