Using the recently developed two‐microphone technique of acoustic intensity measurement, radiation efficiencies of a single panel and individual panels of a complete vehicle structure have been made under controlled, laboratory conditions. The data obtained from the single panel were used to develop measurement techniques and study the sound field near the panel. Radiation efficiencies of the vehicle structure were used along with measured vibration response obtained under normal operation conditions to determine the sound power produced by each individual panel. Results describing the technique development and the application to the vehicle structure are presented in this paper.