Abstract:

 Aimed at the reusable launch vehicle with four symmetrically-distributed eversion struts landing gear，a new two-stage crashworthy damper which contains an oil pneumatic shock absorber and a honeycomb damper is proposed. The oil pneumatic damper can be reused while the honeycomb damper can protect the carrier under the dangerous conditions. The soft-landing dynamic model is established. Based on the model, four critical landing conditions and the solution of the honeycomb crushing force are given. The collaborative optimization and archive-based micro-genetic algorithm (CO-AMGA) are adopted to optimize the design parameters of the two-stage crashworthy damper. And the radial basis function (RBF) is applied to shorten the time cost. The results show that the maximum acceleration and landing struct force of the vehicle decrease after the optimization. Compared with the traditional damper, the two-stage crashworthy damper has advantages in reducing the maximum impact acceleration and the maximum force of the buffer pillar.

Key words:  Reusable launch vehicle, Crashworthy damper, Landing dynamic, Collaborative optimization, Multi-objective optimization