Landing gear

About: Landing gear is a research topic. Over the lifetime, 3403 publications have been published within this topic receiving 25370 citations. The topic is also known as: landing gear & gear.

Aircraft landing gear actuation system

Abstract: The invention relates to an aircraft landing actuation system, comprising a door actuation device to open and close a landing gear door, and a landing gear actuation device to retract and lower the landing gear. According to the invention, the landing gear actuation system is distinguished by the fact that at least the landing gear actuation device has an electric actuator motor.

Aircraft having extensible landing gear positionable for horizontal and vertical take-off

Abstract: This invention relates to low aspect ratio, allwing aircraft of the type disclosed in my U. S. Patent No. 2,108,093 and has for one of its objects to increase the utility of such aircraft by providing a mechanism which will fully realize those characteristics of a low aspect ratio, all-wing...

Lighter-than-air aircraft with air cushion landing gear means

Abstract: A lighter-than-air aircraft (1) having a gas-filled hull (2) and a pair of spaced apart landing gear units (11, 12) on the underside of the hull arranged on opposite sides of a longitudinally extending central vertical plane of the hull. Each landing gear unit (11, 12) comprises bag skirt means (5-7, 5'-7'), means for supplying air to and removing air from the bag skirt means and actuating means operable to move the bag skirt means between an operative configuration for containing one or more air cushions and an inoperative configuration.

Analysis of landing gear noise during approach

Abstract: Airframe noise is becoming increasingly important during approach, even reaching higher noise levels than the engines in some cases. More people are affected due to low flight altitudes and fixed traffic routing associated with typical approaches. Formost air- craft types, the landing gear system is a dominant airframe noise source. However, this element can only be modeled in an approximate manner in wind tunnel experiments. In this research, flyovers of landing aircraft were recorded using a 32 microphone array. Fun ctional beamforming was applied to analyze the noise emissions from the landing gear system. lt was confirmed that for some aircraft types, such as the Airbus A320 and the Fokker 70, the nose landing gear is a dominant noise source du ring approach. The correlation between the noise levels generated by the landing gear and the aircraft velocity was found to be significant, explai ning about 70% of the varia bility found in the noise levels, which is in good agreement with all known theory. Moreover, the experimental resu lts for the Airbus A320 measurements were compared with those obtained using the DLR system noise prediction tool PANAM. Whereas the total aircraft noise levels were in good agreement. the measurements indicate a higher contribution from the nose landing gear noise compared to the predictions.

A Numerical Aeroacoustics Analysis of a Detailed Landing Gear

Abstract: This paper presents results of an unsteady simulation of a detailed nose landing gear. The discussion focuses on a steering system which is one of the most important nose landing gear source of noise. The results show that the complex geometry of the steering device generates acceleration in the flow field. The vorticies generated by the hydraulic pipes are pointed out and a wide frequency range pressure spectra is presented.