头盔以泡沫材料填充。
它们通常由乙烯基醋酸乙脂(EVA)泡沫或聚氨酯(PU)材料制成，很多情况还填充了空气或胶体。
It's generally made from ethyl vinyl acetate (EVA) foam or polyurethane (PU) and in many cases is supplemented by air or gel inserts.
采用空间回路网法计算得到填充吸波泡沫的碳纤维复合材料格栅结构的电磁散射性能。
The spatial network method is used to calculate the electromagnetic wave scattering characteristic of carbon fiber composite grid structures filled with Absorbing foams.
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