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Influence of side aerodynamic derivative uncertainty on side flight load based on global sensitivity analysis
Received date: 2015-06-29
Revised date: 2015-09-25
Online published: 2015-10-10
Considering the uncertainty of aerodynamic derivative used in flight load calculation, combining with the equations of motion for yaw maneuver, the influence of side aerodynamic derivative uncertainty on side flight load is investigated, utilizing the variance-based global sensitivity analysis (GSA) method. According to the parameters of a certain aircraft, the ranking results of GSA are obtained using the proposed method. The results show that:the derivative of side force coefficient with respect to angle of sideslip has the most significant influence on the vertical tail side load due to sideslip and damping, as well as total vertical tail side load, besides the influences of weathercock stability derivative and rudder control effectiveness are also significant; the vertical tail side load due to rudder is only influenced by the derivative of side force coefficient with respect to rudder deflection; tail-off side load is mainly influenced by weathercock stability derivative, rudder control effectiveness and the derivative of tail-off side force coefficient with respect to angle of sideslip; yaw damping derivative has almost no influence on all side loads. Meanwhile, the example verifies the validity of the method, which is of benefit to promoting the calculation precision of flight load in aircraft design.
RUAN Wenbin , LIU Yang , XIONG Lei . Influence of side aerodynamic derivative uncertainty on side flight load based on global sensitivity analysis[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2016 , 37(6) : 1827 -1832 . DOI: 10.7527/S1000-6893.2015.0264
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