A Preliminary Study of Landing Gear Noise in Low-Speed Wind Tunnel

Preliminary study for research and development of noise from landing gear which should be seriously investigated in the near future was carried out by using lifting body configuration model with several types of landing gear. From results of this experiment, the effects of the number and size of wheel and main leg door on sound pressure level and frequency of landing gear noise were better understood. In addition, the effect of an inner space of wheel which was filled by clay to simulate "dish-wheel" was investigated. We were able to obtain important knowledge of the characteristics of frequency of landing gear noise, effect of configuration and clearance of wheel and dominant noise source of landing gear.