Investigation of elastic-deformed state, orst and elastic wings of great elongation
Journal Title: Механіка гіроскопічних систем - Year 2018, Vol 0, Issue 35
Abstract
Due to the growth of economic requirements for modern aircraft, the parameter of the aerodynamic range Kmax • M, where Kmax is the maximum aerodynamic quality of the airplane, has become especially relevant, M is the flight speed relative to the speed of sound. The increase in the aerodynamic range at the expense of M for modern aircraft of the transport category is problematic because the flight speed reaches M = 0,7 ÷ 0,9, and the increase due to Kmax became possible due to an increase in the lengthening of the wing λ or a decrease in its swept angle χ. Under load, the wing deforms and the nature of the load distribution changes along the width of the wing. Such a phenomenon of static aeroelasticity (SA) leads to a decrease or increase in the existing bending and twisting moments of the wing, especially in the case of swept wings (λ ≥ 8). Therefore, the reliability of the determination of external loads, taking into account the influence of static aeroelasticity, is important. Load is the input parameters for calculation of strength, analysis of elastic-deformed state (EDS) of the design and forecasting its weight efficiency. Taking into account the effects of static aeroelasticity reduces the external load in some sections by wings up to 14%. The comparison of relative moment’s shows that the value of the bending moment coincides with the bending moment obtained from the experimental data. The method of aerodynamic influence coefficients (AIC) has a significant advantage over other methods, which is that a once-defined matrix of aerodynamic influence coefficients can be used in different load scenarios. This reduces the time spent on the calculations and eliminates the need for repeated experiments.
Authors and Affiliations
Yu. I. Bondar,, О. О. Ptitzyn
Keywords
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