沥青混合料骨架细观接触的高通量计算

为实现沥青混合料骨架细观接触的高通量计算,首先提出了近邻列表法与改进的窗搜索法两种接触计算方法;然后,使用4种（AC13、AC16、OGFC13及SMA13）沥青混合料对比了两种新方法与遍历法、窗搜索法及iPas软件在计算精度与效率方面的差异,采用虚拟试件研究了可实现计算速度与精度均衡的图像分辨率范围;最后,就高通量计算方法的适用性进行了验证。结果表明：近邻列表法可避免遍历法不可能发生接触集料对的冗余接触计算,改进的窗搜索法通过形态学膨胀处理即可完成传统窗搜索法环扫一周的目的;近邻列表法、遍历法、窗搜索法、改进的窗搜索法及iPas软件尽管计算原理存在差异但具有一致的精度;不同计算方法的计算效率排序为近邻列表法>遍历法>改进的窗搜索法>iPas软件>窗搜索法;图像分辨率的降低会提高接触计算的速度但是会降低接触点计算结果的准确性,综合考虑精度与效率的要求,图像分辨率范围处于0.05～0.075 mm/pixel时可实现计算速度与精度的均衡;近邻列表法能有效地实现沥青混合料骨架细观接触的高通量计算。

High-Throughput Calculation for Meso-Contact of Asphalt Mixture Skeleton

In order to realize the high-throughput calculation of meso-contact for asphalt mixture skeleton, this paper firstly put forward two contact calculation methods, the neighbor list method and the improved window search method, and then four asphalt mixtures AC13, AC16, OGFC13 and SMA13 were used to compare the difference in calculation accuracy and efficiency among two new methods and exhaustive method, window search method and iPas software, and the range of image resolution that can achieve the balance of calculation speed and accuracy was investigated using virtual specimens. Finally, the applicability of the high throughput calculation method was verified. The results show that neighbor list method can avoid the redundant contact calculation of contact aggregate pairs with the exhaustive method, and the improved window search method can accomplish the purpose of a one loop sweep of the traditional window search method by morphological expansion processing. Neighbor list method, exhaustive method, window search method, improved window search method and iPas software have the same accuracy although there are differences in calculation principles. The order of computational efficiency of different calculation methods is: neighbor list method > exhaustive method > Improved window search method >iPas software > window search method. The decrease of image resolution will improve the speed of contact calculation but reduce the accuracy of contact point calculation results. Considering the requirements of both accuracy and efficiency, a balance of calculation speed and accuracy can be realized when the image resolution range is 0.05~0.075 mm/pixel. The neighbor list method can effectively realize the high throughput characterization of meso-contact of asphalt mixture skeleton.