Abstract

Due to advances in engine-noise reduction, airframe noise has become one of the main sources of modern aircraft noise during approach. The landing gear is an important source of airframe noise, and its mitigation is necessary to reduce further the overall aircraft noise and meet the current and future regulations on community noise. The problem of modeling and reduction of aerodynamic noise for such a complex object as the landing gear of a modern aircraft, which consists of a large number of elements of various shapes and sizes, is extremely difficult. In Russia, experimental studies of landing-gear noise can be carried out either for small-scale models (in particular, in the AC-2 anechoic chamber at TsAGI) or in full-scale flight tests using the noise–source localization method (beamforming). Thus, it is of interest to compare the noise measurements of small-scale aircraft landing-gear models with the results of flight tests in which the landing-gear noise is measured using the beamforming method. In this paper, for the first time in Russian practice, such a comparison is made in relation to the landing-gear noise of a regional aircraft and a method is proposed for recalculating the results of small-scale landing-gear tests to the full scale.