Mathematical simulation and evaluation for lateral-directional static stability airworthiness compliance of civil aircraft

According to the requirements of airworthiness standards for lateral-directional static stability of civil aircraft, an assessment method is proposed based on the pilot-aircraft closed-loop mathematical simulation and calculation. Quantitative assessment criteria are set up considering the requirement of the specific airworthiness clause. Nonlinear aircraft system model and pilot control model are established and synthesized to simulate the specific flight mission such as steady-state linear sideslip flight. An assessment of airworthiness compliance is made by comparing simulation results with the criteria. By using the method, the airworthiness compliance of a civil aircraft is assessed and the reasonable ranges of the two lateral-directional static stability derivatives are accurately determined. This method can be applied to the preliminary design phase of civil aircraft and the calculation results offer theoretical references for flight tests.