| Abstract:The cost of finite element simulation of bird strike fan blade damage is high. In order to solve engineering problems, the
classic bird strike cascade slicing model is used to establish the mathematical model for the dynamic load of bird impact. Combined with
the results of bird strike component tests, the fitting technology was used to clarify the functional relationship between the degree of fan
blade damage and the calculated value of the maximum critical dynamic load, and the blade damage prediction response surface was
formed. Rapid prediction of fan blade damage due to bird strike was realized, and the prediction workflow based on the response surface
method was established. Combined with the requirements of the turbofan engine bird ingestion test, the fan structural features, and the
results of the conducted bird strike component tests, the blade damage prediction response surface was established, the radial bending, and
chordwise bending of two bird-strike schemes were preliminarily identified, and the tearing ranges do not exceed 0.3867 and 0.3941,
respectively. The tearing and the chordwise bending are significantly correlated, showing a parabolic trend. The results show that the
predicted damage is within the acceptable safety level. The prediction method can identify the damage range and trend. It can provide
quantitative technical support for subsequent work such as bird strike finite element simulation, test planning, safety analysis, fan blade
bird strike resistant design, etc. |
