ABSTRACT

This study aims to evaluate the field performance of the piezoelectric-based energy harvesting pavement system (PZ-EHPS) under moving traffic loads by multi-physics modelling. Finite element models (FEMs) with multiple physical interfaces were built with the close circuit system. The laboratory scale of FEM was analysed to validate the voltage output as compared to the measurements in laboratory tests. To enhance the computational efficiency of large-scale simulation, a homogenisation approach was developed to convert the piezoelectric composite layer to the homogeneous layer with equivalent mechanical and electric properties. The variations of power output patterns from the PZ-EHPS, with different geometric designs under different traffic loading levels and temperature conditions, were studied. The results show that the width of the PZ-EHPS shall match the wheel path to generate electricity and avoid energy consumption in the area uncovered by traffic loading, during the electricity transmission. The power output of the PZ-EHPS shows an exponential relationship with the increase of load magnitude from vehicles. Future studies are needed to achieve the full utilisation of each function layer for building smart pavement with multiple functions.

摘要

本研究旨在通过多物理场建模评估基于压电的能量收集路面系统 (PZ-EHPS) 在移动交通负载下的现场性能。使用闭路系统构建了具有多个物理接口的有限元模型 (FEM)。对 FEM 的实验室规模进行了分析，以验证与实验室测试中的测量值相比的电压输出。为了提高大规模模拟的计算效率，开发了一种均质化方法，将压电复合层转换为具有等效机械和电性能的均质层。研究了 PZ-EHPS 在不同交通负载水平和温度条件下具有不同几何设计的功率输出模式的变化。结果表明，PZ-EHPS的宽度应与车轮路径相匹配以发电，并避免在电力传输过程中在交通负荷未覆盖的区域消耗能量。PZ-EHPS 的功率输出与车辆负载幅度的增加呈指数关系。未来的研究需要实现每个功能层的充分利用，以构建多功能的智能路面。