基于无人机技术的沥青厂集料堆体积测算方法

Aggregate is an important raw material in the production of asphalt, and its inventory volume calculation efficiency and accuracy are important for aggregate intelligent management. Aiming at the problems of low efficiency and poor accuracy in traditional manual counting of aggregate volume, the unmanned aerial vehicle (UAV) tilt photogrammetry technology was used to carry out automated calculation of aggregate volume. Taking the aggregates from the outdoor warehouse of the Huairou Asphalt Plant of Beijing Municipal Road and Bridge Building Materials Group as a research object, using DJI Pro aircraft and Agisoft Metashape software, the data was collected based on the UAV tilt photogrammetry technology. The point cloud model was generated based on the structure from motion algorithm and the multi-view stereo algorithm. A three-dimensional model was established with surface texture based on surface reconstruction algorithm and texture mapping algorithm, realized the visual management of asphalt aggregate, and based on the generated aggregate point cloud, the calculation method of aggregate volume based on triangulation method was studied. Results show that the UAV tilt photography technology quickly obtains the aggregate image of outdoor warehouse, and improves the efficiency of aggregate volume calculation. The relative error between the volume calculation results and the aggregate storage data was controlled within 15%, which met the engineering need. The model parameter setting had no significant effect on the final result, but when the model parameter was set to the highest, the modeling time increased significantly. Therefore, when the model parameter was set to the lowest, it greatly saved time and improved the modeling efficiency, which was of great significance in practical application. The research provides technical support for visual management and intelligent management of aggregate, and has high engineering value.