Optimization Design of Split-Link Cord for High Gliding Parafoils
In order to obtain the optimal design of the split-link cord structure of the parafoil rope,an optimization method of split-link cord design for high gliding parafoils is presented.Firstly,computational fluid dynamics method and theoretical methods are used to analyze the aerodynamic performance of two-dimensional and three-dimensional para-foils,respectively.The optimal cord installation angle is determined based on the optimal attack angle,where the best aerodynamic performance can be achieved.On this basis,the geometric analysis and mechanics analysis are performed to derive the equilibrium equations of cord mechanics and the equations of paracord length.Finally,the optimization algo-rithm based on the external penalty function method and Davidon-Fletcher-Powell algorithm(DFP)is established to deter-mine the optimal split-link cord design corresponding to different structure safety coefficients with the minimum cord length as the optimization objective under structure safety.The results show that the cord length and drag coefficient can be reduced by 9.0%and 8.8%,respectively,compared with the cord design by previous empirical method,which is con-vinced to improve the gliding performance of parafoils.In addition,the parafoil performance is able to be further im-proved by adjusting the structure safety limits.
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维普
