Abstract
Indoor noise testing of motor vehicles poses advantages not offered by the conventional outdoor pass‐by test method. The sound power of a motor vehicle can be determined by measuring sound intensity over a surface enclosing the vehicle. Due to its geometric simplicity, a hemisphere was chosen for this purpose. In order to facilitate efficient measurement of sound intensity on a hemisphere, large enough to enclose an automobile situation on chassis dynamometer rolls, a special structure was designed to carry the intensity measurement probes. The structure was semicircular in shape made up of two concentric sections. The inner section with the measurement probes was hinged to the outer support structure such that it could be lowered into a position providing easy access to the microphones for calibration purposes. Truss sections were used in the construction of the microphone boom to present as small an interference to the sound field as possible. The entire structure was suspended at its apex and was drive...
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