A METHOD FOR MEASURING VEHICLE NOISE SOURCE HEIGHTS & SUB-SOURCE SPECTRA

摘要

The system described is truly ‘turn-key’. It can be deployed at the roadside in about l/2 hour andcan be powered entirely by a small (1.5 KWatt) generator. Since it takes less than 1 minute forthe system to acquire, analyze and store a vehicle pass-by it is possible to collect a large databaseof vehicle sub-source spectra with the minimum of operator input in a relatively short timeperiod. Further investigation of the system limitations is necessary however to build confidencein the data at certain frequencies.