In order to explore the theoretical and optimization methods of structure design for multiple high g impact protection of lightweight devices in projectile system, numerical simulation, experimental verification and theoretical analysis were performed on dynamic response of novel syntactic foam filled shells subjected to constant velocity compression and multiple high g shocks. Based on multi-objective optimization technology, optimum structural design was carried out for cylindrical foam-filled shells loaded by three high g shocks, where the amplitude and pulse width of the half-sine excitation acceleration are 40000g and 250μs. Results show that, (1) when the impact velocity equals to the average compression velocity during high g shocks, the structural energy absorbing behaviors are same. (2) The force contribution of foam/shell interaction is 10~24% of the total crushing force. The established theoretical model of the average crushing force shows good accordance with the numerical simulations, and can provide theoretical basis for predicting the response acceleration and parameter design under multiple high g shocks. But the predicted acceleration value is lower than the actual response acceleration amplitude in general. (3) The ideal point method (IPM) and non-dominated sorting genetic algorithm (NSGA II) are both applicative for structure optimization of high g shock protection, but the results of IPM is significantly dependent on the weight coefficient of individual objective. The Pareto frontier of NSGA II is larger than that of IPM, and is more suitable for the optimal design combined with the other requirements such as the stability of the response acceleration. When the design response acceleration is 12000g, considering the amplitude of response acceleration and the specific energy absorption as the optimization objectives, the optimized shell thickness and the relative density of syntactic foam are 1.58mm and 0.27.
Keywords: High g shock; syntactic foam; energy absorption; multi-objective optimization
Key words
High g shock /
syntactic foam /
energy absorption /
multi-objective optimization
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