The Longitudinal Stability Of Aircraft Under The Influence Of Atmospheric Gravity Waves

Atmospheric gravity waves is a very common and important dynamic processes in theatmosphere. Gravity waves play an important role in the global atmosphere energy balance ofpayments in the global. This paper studies gravity waves and the influence of atmospheric gravitywaves on the aircraft flying.This paper first describe the layered structure of the atmosphere and the vertical distribution ofatmospheric temperature, analyze the generation of atmospheric gravity waves, the formation andpropagation, and discuss the relationship between the background wind field and atmospheric gravitywaves. After that, this paper does a detailed derivation and description to the various forces of gravitywaves and formulas. Then, this paper focuses on discussing the causes of mountain gravity waves,establish the model of gravity wave. Then the numerical simulation is carried out and the comparativeanalysis of verification, and get the relationship of derived wave velocity between mountain terrain,horizontal direction and wind speed, followed by analysis of the Atmospheric gravity wavesinstability broken becomes turbulent.This paper analyzes the kinetic equation of the aircraft, use the principle of small perturbations tolinearize the kinetic equation, establish the longitudinal dynamic stability model of Civil aircraftBoeing707. Stable propagation of atmospheric gravity waves and atmospheric gravity waves brokeninstability becomes turbulent, aircraft into the area of the gravity waves affect the characteristicequation characteristic roots. According to the characteristic root, judge the influence of gravitationalwaves of aircraft longitudinal stability and simulate overload change of aircraft. The comparativeanalysis of the obtained stable atmospheric gravity waves, the aircraft is longitudinally stable; Withthe gravity wave amplitude increases, the aircraft overload increases, but overloads are all very small;When atmospheric gravity waves does not become turbulent, the aircraft is longitudinally unstable,overload of rapid change. The aircraft will produce severe turbulence, reducing flight speed canenhance the stability of the aircraft.