LiDAR-based SLAM Systems are widely applied in robotics for their accuracy and robustness. However, accurate localization in small-scale indoor scenes is challenging since the point cloud features of the sparse line scan LiDAR cannot always provide sufficient space constraints. In our experiments, even state-of-the-art methods have heavy odometry drift. In this paper, to address this problem, we propose a method that can improve the performance of existing algorithms in small-scale indoor scenes. By installing a LiDAR perpendicular to the existing LiDAR, our method enhances the constraint in the vertical direction. We test our method on LOAM and FAST-LIO2, and the results show significant improvements on our own collected datasets. In addition, to accurately merge the two LiDAR’s cloud points, we propose a high-accuracy dual-LiDAR calibration method with rotation and translation errors less than 0.005 rad and 0.01 m respectively.
To study the influence mechanism of process parameters on the temperature field and the repair performance in Inconel718 nickel-base-superalloy laser additive repairing process, numerical research was carried out. A three-dimensional finite element model was established, and the finite element software ANSYS was used to simulate the temperature field. The influence of the laser power, the scanning speed on the laser additive repairing temperature distribution and the penetration depth and width of the repair zone were analyzed. The numerical result and the experimental measurement result was compared, and the result showed that as the laser power is in the range of 229~668W and the cladding speed is in the range of 6~16mm/s, the metallurgical bond was formed between the repair layer and the matrix material. The maximum temperature at the interface between the repair layer and the substrate is proportional to the laser power and inversely proportional to the scanning speed. The theoretically calculated penetration depth and penetration width of the repair zone are basically consistent with the experimental measurement results. The theoretical simulation can provide theoretical guidance for the parameter optimization in the laser additive repairing process.
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