Experience Using a Sound Intensity Technique to Determine In-Cab Sound Paths and Treatments

摘要

In 2002, the author presented a technique for determining the sound paths into a large vehiclecab through the use of sound intensity [1]. With this technique, the interior cab surface isdivided into 20 to 30 surfaces and the sound intensity radiated from each of the surfaces ismeasured when the vehicle is operating at a steady state condition. Then, knowing the area ofeach surface, the cab room constant and the distance to the receiver, the sound pressure levelcan be summed at any point inside the cab and the locations contributing to the overall soundlevel can be rank ordered. Once this information is acquired and a model of the sound pathsdeveloped, treatments to the various sound paths can be developed and their performance at thereceiver predicted. This paper provides an update to the measurement technique, describeshow large component tests, (front of dash and floor system bucks) are integrated into the model,and provides a case study illustrating the models use in solving vehicle noise control problems.