Enhanced collaborative optimization modeling method of BLE about honeycomb sandwich panel

Ballistic limit equation (BLE) is a key technology to spacecraft protection structure design and orbital debris impact risk assessment. Modifying present BLE based on experimental data is a commonly used method to obtain new equation with high reliability. In order to obtain new equation quickly and accurately, selecting the experimental result of 131 honeycomb sandwich panels of carbon fiber composite materials (CFRP) as data, the Christiansen equation is modified with enhanced collaborative optimization (ECO) method. The optimal results of ECO method and exhaustion method are consistent and the improvement of computational efficiency is given. To assess the applicability of the modified equation, experimental data of 25 honeycomb sandwich panels of aluminum alloy material are used. The prediction results show that the totality predicted rate increases from 68% to 84%, the safety predicted rate increases from 76% to 92%, the absolute error sum of square decreases from 0.046 2 to 0.006 3 and the relative error sum of square decreases from 1.046 0 to 0.109 0.