基于建筑信息化模型(building information modeling, BIM)技术,建立了由明挖隧道、工作井和顶管隧道相结合的电力隧道三维可视化模型。模拟了电力电缆在隧道中的敷设,创建了适用于电力隧道的电缆支架体系模型的族库。论述了三维信息化...基于建筑信息化模型(building information modeling, BIM)技术,建立了由明挖隧道、工作井和顶管隧道相结合的电力隧道三维可视化模型。模拟了电力电缆在隧道中的敷设,创建了适用于电力隧道的电缆支架体系模型的族库。论述了三维信息化模型在辅助隧道关键部位设计、隧道巡检、协同设计以及材料量统计等方面的应用。BIM技术的应用可以极大地节约设计时间成本,提升设计质量,减少因设计变更带来的损失。展开更多
With the wide application of laser welding technology in automobiles and rail transportation, the non-destructive testing technology for laser welding seams is also getting better. Aiming at the laser welding seam of ...With the wide application of laser welding technology in automobiles and rail transportation, the non-destructive testing technology for laser welding seams is also getting better. Aiming at the laser welding seam of two-layer metal sheet below 3 mm, the possibility of laser welding seam detection by air-coupling ultrasonic detection technology is discussed. By numerical analysis and experimental analysis,Lamb wave is excited on aluminum plate in air. Through the propagation simulation of Lamb wave in laser weld specimen, the influence of laser weld width and weld quality on reflectivity and transmittance is analyzed. The propagation law of Lamb wave in laser weld specimen is clarified. The results show that the quality of laser weld can be evaluated by the mode of Lamb wave A0.展开更多
文摘基于建筑信息化模型(building information modeling, BIM)技术,建立了由明挖隧道、工作井和顶管隧道相结合的电力隧道三维可视化模型。模拟了电力电缆在隧道中的敷设,创建了适用于电力隧道的电缆支架体系模型的族库。论述了三维信息化模型在辅助隧道关键部位设计、隧道巡检、协同设计以及材料量统计等方面的应用。BIM技术的应用可以极大地节约设计时间成本,提升设计质量,减少因设计变更带来的损失。
文摘With the wide application of laser welding technology in automobiles and rail transportation, the non-destructive testing technology for laser welding seams is also getting better. Aiming at the laser welding seam of two-layer metal sheet below 3 mm, the possibility of laser welding seam detection by air-coupling ultrasonic detection technology is discussed. By numerical analysis and experimental analysis,Lamb wave is excited on aluminum plate in air. Through the propagation simulation of Lamb wave in laser weld specimen, the influence of laser weld width and weld quality on reflectivity and transmittance is analyzed. The propagation law of Lamb wave in laser weld specimen is clarified. The results show that the quality of laser weld can be evaluated by the mode of Lamb wave A0.
