Abstract
Automated sound-intensity systems have been used routinely for indoor measurement of the sound power of earthmoving equipment and automobiles. The measurement surface is a hemisphere, with sound intensity on the concrete floor assumed to be zero. The system automatically moves an array of sound-intensity probes over the hemisphere, making measurements at desired locations and computing the sound power when the measurements are completed. With an automated system, the number and distribution of measurement positions and the starting position of rotation can be changed without requiring much human labor. In the present paper, the effect on the integration accuracy of the number and distribution of measurement positions and of the starting position of rotation is investigated, using an automated system to measure the sound power of a garden tractor and a motorcycle. Based on these results, guidelines are proposed for achieving good integration accuracy with an automated system.
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