Abstract：Due to larger dispersity of mechanical performance and lower machining precision of composite materials, thin-walled composite energy-absorbing structures have uncertainties hard to ignore. Here, an optimization design method for thin walled composite energy-absorbing structures with parametric uncertainty was established to identify parametric uncertainty in design stage and design thin walled composite structures with the optimal energy absorption feature. Firstly, parametric ranges were acquired according to using conditions, and the central combined test design was used to determine the test matrix of designed parameters, calculate the mean value and standard deviation of each group of designed parameters’ energy absorption characteristic index in the test matrix, and determine response surface equations between different design parametric groups and mean values, standard deviations of their energy absorption indexes, respectively. Finally, the sequence quadratic programming algorithm was adopted to get an optimization solution after substituting response surface equations and design requirements into the optimized mathematical expression. A T700/3234 composite thin-walled circular tube was taken as a study object. Within the specified ranges of feature sizes, under the specified peak load, the maximum ratio energy-absorbing problem and the ratio energy-absorbing’s minimum standard deviation problem were solved, respectively to verify the applicability of the proposed method.
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