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The voltage dynamic properties of PEM fuel cell stack have been analyzed through experimental investigation. Different behaviours between voltage overshoot and undershoot are found under load commutations. A semi-empirical dynamic model for stack voltage is introduced on the basis of experimental investigation. The proposed model can predict the transient response of stack voltage under step change in current. Comparing with previous model, the suggested model indicates a better agreement between tests and simulations. 相似文献
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通过粉末冶金方法利用等离子电火花烧结在850℃制备了石墨烯增强钛基复合材料,并利用Gleeble-1500D研究了复合材料在室温和800℃时的压缩变形行为。研究发现:石墨烯均匀地分散在钛基体中,细化了钛基体的微观组织,提高了基体室温和高温的压缩强度和硬度。其中室温和高温屈服强度分别提高了22.87%和23.07%,抗压强度分别提高了13.91%和28.57%,室温和高温的硬度分别提高了16.4%和10%。同时发现石墨烯和钛基体反应生成了少量的碳化钛颗粒,能对基体产生强化效应。研究结果表明石墨烯/钛复合材料可成为一种高性能的特种材料,具有潜在的工程应用价值。 相似文献
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