Noise Source Definition - Exterior Passenger Vehicle Noise 720274

A drive-by exterior noise program was conducted to determine the contribution of each car noise source-engine/exhaust, fan, and tire/roadway-to the total exterior drive-by noise of a passenger vehicle. A 1970 high- and low-power sedan and a 1970 high- and low-power sporty compact were utilized in the test sequence.
Octave-band and dBA sound levels were recorded with the microphone positioned 25 ft away for various modes of vehicle operation at cruise and wide-open-throttle conditions.
Results indicate for cruise (road-load) conditions that:
  1. 1.
    Except for high-performance vehicles, the predominant source of exterior vehicle noise above 500 Hz is tire/roadway noise.
  2. 2.
    The major sources of exterior noise below 500 Hz are both engine/exhaust noise and tire/roadway noise.
  3. 3.
    Fan noise is an insignificant contributor to passenger vehicle exterior noise at present noise levels.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 16% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.