| Citation: | CAO Huiling, TANG Xinhao. Airworthiness compliance verification method of CO2 metric based on QAR data[J]. Journal of Beijing University of Aeronautics and Astronautics, 2020, 46(3): 474-480. doi: 10.13700/j.bh.1001-5965.2019.0272(in Chinese)
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To assess aircraft carbon dioxide emission levels and verify airworthiness, the latest ICAO certification process for carbon dioxide emissions has been studied. The comprehensive index CO2 metric consisting of the specific air range (SAR) and the reference geometry factor (RGF) is used as a measure of airworthiness. The test flight measurement point is selected according to the maximum takeoff weight (MTOM) value of the aircraft, and the corresponding aircraft carbon dioxide metric value limit line is determined. Based on this, a fast evaluation method of aircraft CO2 metric based on quick access recorder (QAR) data is proposed. Using the QAR data of the new serving aircraft, the corrected relationship between fuel consumption rate and thrust and that between airspeed and thrust are established by multi-parameter support vector machine regression (SVR) method. The total weight of the aircraft is used to solve the SAR values and the CO2 metric under the three flight test points. The QAR data of a new serving B777-200 aircraft was used for case analysis. The calculation results show that the CO2 metric of the model is 1.598 7, which exceeds the limit line by 20.5%. The proposed calculation method of CO2 metric based on QAR data can be used as an effective way to complete the rapid assessment of aircraft carbon dioxide emission levels.
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