An Applicability Assessment Method for Bird Strike Airworthiness Clauses Based on Shock Energy
A technology of impact energy and impact energy, applied in the field of applicability assessment of bird strike airworthiness clauses based on impact energy
Active Publication Date: 2018-11-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0004] Purpose of the invention: The present invention aims at the applicability of airworthiness clauses for bird strikes of aircraft at present, uses bird strike cases to study the bird flock environment of aircraft operation, and conducts research on the applicability evaluation method of bird strike airworthiness clauses based on impact energy, so as to realize the Quantitative assessment of bird strike risk
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[0021] In the following with reference to the accompanying drawings, we will take my country's bird strike airworthiness clause CCAR 25.775 (windshield and windows) as an example for further detailed description.
[0022] First, collect and organize n groups of bird strike cases in my country, where the bird weight m can be obtained from the type of bird and the height of the bird strike; the speed v can be obtained from the indicated airspeed recorded when the bird strike occurred, if the indicated airspeed cannot be obtained exactly , the speed at which the bird strikes can be estimated according to the correspondence between the flight phase and the flight speed. Different aircraft types and different routes have their own specific correspondence between flight phases and flight speeds.
[0023] Second, according to the formula The impact energy value of each bird strike case is calculated and sorted from small to large, and each impact energy is recorded as e i (i=1,2,.....
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The invention provides a bird strike airworthiness clause applicability evaluation method based on impact energy, wherein the method is used for evaluating and revising Chinese existing bird strike airworthiness clauses. The method comprises the steps of sorting bird weight and speed in bird strike by means of bird strike instance data, and performing calculation for obtaining bird strike impact energy; secondly, performing distribution fitting and rule analysis on the bird strike impact energy by means of twofold two-parameter Weibull distribution; then aiming at a bird strike airworthiness clause requirement, calculating a bearable bird strike impact energy value which is prescribed in a safe range of a structure which corresponds with the claw, and obtaining a probability which exceeds the impact energy value based on the impact energy distribution; and obtaining a bird strike risk value according to the generation probability of an airplane bird strike event in an actual bird flock environment. According to the bird strike airworthiness clause applicability evaluation method, the actual bird strike instance data of the airplane are utilized; the bird flock environment, the airworthiness clause and the risk requirement are combined; not only can applicability of the Chinese existing bird strike airworthiness clauses be quantitatively evaluated, but also a method is realized for revising the bird strike airworthiness clauses.
Description
technical field [0001] The invention relates to the technical field of bird strike risk assessment, and relates to a method for applicability assessment of bird strike airworthiness clauses based on impact energy. Background technique [0002] According to statistics, since 1960, at least 78 civil aircrafts were lost, 201 people were killed, 250 military aircrafts were lost, and 120 pilots were killed due to bird strike accidents worldwide. In order to ensure the safety of aircraft, Federal Aviation Administration (FAA), European Aviation Safety Agency (EASA), Civil Aviation Administration of China (CAAC), etc. have formulated bird strike airworthiness clauses in their regulations. my country's airworthiness started relatively late, therefore, CAAC basically refers to the bird strike airworthiness provisions formulated by the FAA. However, the bird flocking environment of aircraft operating in my country and North America is different, so the airworthiness provisions for bi...
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IPC IPC(8): G06Q10/06
CPCG16Z99/00
Inventor 蔡景朱贝蓓左洪福李鑫
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS