Analysis And Research Of Bird Strike On Canopy Based On SPH Method

Bird strike seriously threats to the flight safety of aircraft, so the aircraft must meet certain anti-bird strike. Bird strike issue was studied and anti-bird strike of the structure is improved based on theory analysis and computer simulation.In the first chapter, previous research of bird strike was discussed, and bird body and canopy combined solution coupling method is an important current methods and trends in studying bird strike. In the second chapter, four methods of numerical model were discussed and compared, and smoothed particle hydrodynamics (SPH) method was considered to be a good method to solve high velocity bird strike, and the basic theory of SPH method about bird strike was described. In the third chapter, bird model parameter inversion method which could reduce the error between the experimental test and simulation test was present. Orthogonal design of experimental method was introduced to identify the model parameters which were sensitive to displacement, and then those parameters were optimized based on adaptive response surface method. The results demonstrated that when bird model adopted the optimized parameters, the simulation curve and experimental curve fitted better. In the fourth chapter, non-linear optimization was used to improve the anti-bird strike of structure. Meanwhile, the mass of structure was reduced. In the fifth chapter, uncertainty of bird strike was considered for further study of bird strike, the uncertainty bird strike model based on interval numbers of three elements was present, and the general probability density function and the corresponding calculation of reliability were present.