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美国作业代写:Factors affecting aircraft rise rate

2018-01-04 来源: 51due教员组 类别: Paper范文

下面为大家整理一篇优秀的paper代写范文- Factors affecting aircraft rise rate,供大家参考学习,这篇论文讨论了影响飞机上升率的因素。影响飞机上升率的因素有很多,首先是飞机的自身因素,尤其是发动机功率更是飞机动力的绝对源泉,直接影响着飞机的水平飞行速度。除了飞机自身因素,自然因素也是影响飞机上升率的常见因素,尤其是复杂的天气状况对飞机的飞行有着莫大的影响。

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There are many factors that affect the rate of aircraft rise, in this paper, the factors affecting the aircraft rise rate are summed up in two aspects: aircraft's own factors, including aircraft engine quality, aircraft parts of the craft, aircraft level flight speed and so on; natural factors, including wind pressure factors, thunder thunderstorm weather, rain and snow factors and so on.

The length of the runway is limited, the aircraft can get the maximum speed at a limited distance, it is very important to get the maximum rise rate in the takeoff, especially for the aircraft carrier aircraft and other special-purpose machines. So what are the factors that affect the aircraft's rate of increase? The following author on the collection of data analysis.

The first is the aircraft's own factors, including aircraft engine quality, aircraft parts of the craft, aircraft level flight speed, and so on is the impact of aircraft flight rate of the intrinsic factors, especially the engine power is the absolute source of aircraft power, directly affecting the plane's horizontal flight speed.

Aero-engine as the power source of aircraft directly affects the flight performance of aircraft, therefore, in the overall design of the aircraft/engine system, we must consider the coordination of the relationship between the two, to achieve the aircraft/engine integration design requirements. The sensitivity of the engine thrust change to the aircraft least-flying Mach number is very low, the sensitivity to the maximum climb effect is high, the sensitivity to the maximum flight Mach number and the practical ceiling is determined by the engine's specific state and thrust change trend. In other words, the impact of aero-engine thrust on the aircraft rise rate is very obvious, the specific degree of impact we can use data quantification to display, for this we can set a sensitivity analysis model-to facilitate the analysis, the definition of the sensitivity factor.

With the advancement of Technology, the rapid development of the aircraft manufacturing industry, a variety of new materials technology in the aircraft industry has been applied, such as the radar detection of the environment stealth absorbing materials, can provide greater strength of the support of the application of carbon fiber composite materials and so on. Among them, the use of high strength and low quality high-tech flight construction materials for the fuselage to withstand greater engine jitter and flight vibration to provide protection, conducive to a more powerful new engine input and use, so that the aircraft to obtain a greater rise rate to provide relative protection.

In order to improve the lethal power of combat aircraft, in modern combat aircraft are used to mount all types of anti-personnel weapons. When these weapons are mounted, they will not only increase the flying weight and reduce the fuel reserve, but will also change the position and aerodynamic characteristics of the center of gravity of the carrier when they are mounted or projected. Because the plug-in weapon is very heavy and occupy the fuel power reserve part of the position will certainly affect the aircraft's take-off capacity and speed of flight, the Take-off effect of aircraft and the flying speed of aircraft has a direct impact on the rate of increase, so this requires the military machine outside the weapon or equipment of the center of gravity selection is particularly important. Through some evaluation models, we can analyze and synthesize the influence of various external weapon configuration schemes on the flight performance, including the rise rate, and determine the optimal configuration scheme of the external weapon. In addition, by selecting different ways to plug, such as hanging-type plug, plug-type plug-in, embedded plug-in and packaging plug-in, etc., in the aircraft basic performance requirements and aircraft delivery and put the external requirements of the weapon to achieve a balance between the aircraft to provide a relatively large rate of increase.

In addition to the aircraft's own factors, natural factors are also the impact of aircraft rising rate of the common factors, especially the complex weather conditions on the flight has a great impact.

The influence of wind on flight is more complicated, including average wind speed and instantaneous wind speed at different periods. The wind which endangers the flight safety is mainly the side wind, downwind, gust, wind shear, sinking airflow, rising air flow and the source of the flight safety which can not be neglected. High-speed and smooth wind can help the aircraft climb, but the side wind, downwind, gust, wind shear, sinking airflow, rising air flow and source and other adverse wind conditions will affect the aircraft climb, serious may bring the machine to destroy the fatal accident. The Take-off and landing of an aircraft shall be carried out as far as possible under upwind conditions. The plane took off downwind, landing to increase the slide run distance, reduce the rate of rise and fall, when the wind speed exceeds the specified value, there is the risk of running out of the runway or impact obstacles, especially the one-way landing of the airport to pay special attention; wind and landing can reduce the ground speed and land speed, can shorten the running distance, It is generally used to take off against the wind. The takeoff and landing of a plane can become complex when there is a side wind or a large wind component. When the aircraft in the side of the wind Take-off, the aircraft in addition to the forward movement, but also along the direction of the side wind movement, if not timely correction will deviate from the runway direction. After the aircraft grounding, in the process of sliding, side wind on the plane's vertical tail side pressure, will make the nose to the side of the wind direction deflection, may cause the plane to turn and other adverse consequences.

Thunderstorm weather is a common summer weather phenomenon, it is generated by convective cumulonimbus clouds, accompanied by lightning thunder of the local storm, is the strong development of cumulonimbus clouds sign. In the thunderstorm area, in addition to lightning phenomenon, there are strong turbulence, ice, showers and strong winds, and sometimes there will be hail, tornadoes and down-hit storms and other disastrous weather, these will seriously threaten flight safety. In the course of the aircraft climbing stage, if the thunderstorm weather will be affected greatly, the whole development of the cloud, there is always a strong vertical airflow, both the rising air flow and the downward flow. This rising air is very close, and often with very strong array, suddenly large and small, uneven distribution, sometimes a strong wind shear, so the turbulence is particularly strong, in a few seconds flying altitude can change dozens of meters or even hundreds of meters. This strong jet turbulence can cause pilots to manipulate difficulties or even lose control. In this extreme weather, it is almost impossible for a plane to get the maximum rate of rise.

Because of the low visibility of the aircraft, the complexity of the weather and the change of air pressure, the pilot will be very cautious in the course of the aircraft's ascent, and will not pursue the maximum rate of ascent for the purpose of smooth climbing.

The rising rate of aircraft is restricted by many factors, this article makes a superficial analysis on some of the data that I have consulted, hoping to play a reference role for the relevant researchers or friends who are interested in it.

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