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INRQDJICIJQI!The new regulations constraints require light aircra noise reduction due to weaker sound pressure level limitations.Light aircraft manufacturer SO.C.A.T.A. has choosen a collaboration wltlt Acoustic Laboratory of CERTIONERA to carry out a research into its propeller airplanes equipped with piston engine.Noise level limitations depend on the noise standard and the country.Four general regulations are applied for this aircralt categotz : OACl Annex 16 clip.6 and FAR PART 36 Appendix F which involve yover aircra procedure; A l Annex to clip. 10 and FAR PART 36 Appendix G with take-offaicra con guration.Each regulation gives sound pressure level limitations according to airplane mass.But limitations are generally modi ed by each country and lead to sound pressure level decreasing up to 8 dB(A), Consequently aircran noise reduction is necessary because environmental protection emphaslm this tendency.The rst partof investigations is the identi cation of sound mechanisms granulated by the studied aircrait.For this purpose.a static experiment is pertomed in order [0 separate and classify the main sources.Due to environmental conditions.the most appropriate method is the determination of sound power by sound intensity measurement.As a complement to these results.an analysis of yover noise measurement is achieved based on OACi chp.6 noise teguladon
CHUSSEAU et al. (Fri,) studied this question.