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目的:研究聚偏氟乙烯的混合压电-热释电效应;评估混合压电-热释电效应在路面能量收集中的潜力。创新点:首次实验验证了混合压电-热释电效应可视为压电效应和热释电效应的代数总和,即压电效应和热释电效应相对独立,既不相互压制也不相互促进。方法:通过分别控制机械荷载和热荷载,实验测定聚偏氟乙烯压电效应、热释电效应及混合压电-热释电效应(图1和2);根据实地交通量和气温变化,通过简化的混合压电-热释电能量收集解析模型,估算美国俄亥俄州东北部地区路面能量收集的潜力(图4)。结论:混合压电-热释电效应可视为压电效应和热释电效应的代数总和;在聚偏氟乙烯路面能量收集的建模中应该同时考虑压电效应和热释电效应;以本文中所选地区和材料为例,热释电效应弱于压电效应;混合压电-热释电效应能量收集效率的提高有望通过新型的纳米复合材料实现。
PURPOSE: To study the hybrid piezoelectric-pyroelectric effect of polyvinylidene fluoride (PVDF) and to evaluate the potential of hybrid piezoelectric-pyroelectric effect in the energy collection of pavement. Innovation: The first experimental verification of hybrid piezoelectric - pyroelectric effect can be regarded as the algebraic sum of the piezoelectric effect and the pyroelectric effect, that is, the piezoelectric effect and the pyroelectric effect are relatively independent and neither suppress nor promote each other . Methods: The PVDF piezoelectric effect, pyroelectric effect and hybrid piezoelectric-pyroelectric effect were experimentally determined by controlling mechanical and thermal loads separately (Figures 1 and 2). Based on field traffic and temperature changes, Simplified hybrid piezoelectric-pyroelectric energy harvesting analytical model to estimate potential for road surface energy collection in northeastern Ohio (Figure 4). Conclusions: The hybrid piezoelectric-pyroelectric effect can be considered as the algebraic sum of piezoelectric and pyroelectric effects. The piezoelectric and pyroelectric effects should be considered in the modeling of PVDF pavement energy collection. The selected regions and materials in this paper are taken as examples, and the pyroelectric effect is weaker than the piezoelectric effect. The improvement of the energy collection efficiency of the hybrid piezoelectric-pyroelectric effect is expected to be achieved through the novel nanocomposites.