论文部分内容阅读
为减小因介电增强特性带来的路面检测误差,借助模拟路面层状结构的“双电层”模型,对路面层状结构的介电增强特性进行分析。通过Debye模型推导双电层模型介电常数计算公式,采用有限差分算法对模拟路面层状结构的双电层模型建模仿真;根据仿真结果,讨论了路面层状结构中电性参数对介电增强的影响,并基于电容器原理,设计了一款平行板电容器,在低频段对不同膜层的双电层模型进行测量。研究结果表明:双电层模拟的路面层状结构在低频段存在介电增强,其主要受界面层的电导率、厚度等参数影响;面层和基层材料的电性参数只影响路面层状结构的弛豫频率和时间,不影响介电增强;采用增大界面层电导率,限定界面层厚度的方法能减小路面检测中因界面层中各参数差异产生的介电增强,提高测量精度。
In order to reduce the error of pavement detection caused by dielectric enhancement, the dielectric enhancement characteristics of pavement structure are analyzed by means of the “double layer” model which simulates pavement structure. Based on the Debye model, the formula for calculating the dielectric constant of the electric double layer model is deduced. The finite difference method is used to simulate the electric double layer model of the pavement structure. According to the simulation results, Enhanced and based on the capacitor principle, a parallel plate capacitor was designed to measure the electric double layer model of different layers at low frequency. The results show that there is dielectric enhancement in the low frequency band of the pavement layer structure simulated by electric double layer, which is mainly affected by the conductivity, thickness and other parameters of the interface layer. The electrical parameters of the surface layer and the base layer only affect the pavement structure The relaxation frequency and time do not affect the dielectric enhancement. By increasing the conductivity of the interface layer and limiting the thickness of the interface layer, the dielectric enhancement caused by the difference of parameters in the interface layer can be reduced and the measurement accuracy can be improved.