Abstract
Our last issue looked at the EU programme Silence(R) will represent an attempt to integrate, and take forward the work of X-Noise, a European Thematic Network on external noise produced by aircraft. Particular projects within X-Noise include JEAN, on the prediction of jet exhaust noise; RAIN, reducing airframe and installation noise; RANNTAC, developing low-noise turbofan engine nacelles; RESOUND, reducing noise within the engine itself, SOURDINE, on noise-reducing measures around airports, DUCAT, an investigation of duct acoustics and radiation. Together these complementary projects represent, it is thought, a well-rounded programme aimed at reducing aircraft noise. In this article, we look at what one of these projects, RAIN, hoped to achieve, and its rationale.
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