Numerical Simulation and Experimental Verification of Laser Multi‑Section Welding

To address the problems of large welding deformation and splashing in the resistance spot welding of the lubricating oil cooler plate,the laser spot welding was employed,instead of the resistance spot welding,and a novel laser spot welding was proposed,i.e.,laser multi-section welding.The major processes involved in this study referred to a finite element model of pulsed laser lap welding built by adopting SYSWELD simulation software,as well as the laser welding of various welding methods.The effect of different welding methods on the welding quality was studied,the parameters of the average power and the duty cycle were optimized in line with the comparative analysis of the experimentally achieved results and the numerical simulation.As indicated from the experimentally achieved results,when the new 6-sections welding method was adopted,the resulting welded joint achieved the most uniform heat input and the largest welding fusion area,and the tensile properties exhibited by the welded joints were significantly enhanced,whereas some pores remained.By altering the duty cycle,pores could be eliminated to further improve the quality of the joint.The mentioned process method could tackle down the problems facing conventional resistance spot welding.Furthermore,it was capable of improving the uneven heat input of the laser spot welding.

Construction of Multimodal Chinese Tourism Knowledge Graph

With the development of tourism knowledge graphs(KGs),recommendation,question answering(QA)and other functions under its support enable various applications to better understand users and provide services.Existing Chinese tourism KGs do not contain enough entity information and relations.Besides,the knowledge storage usually contains only the text modality but lacks other modalities such as images.In this paper,a multi-modal Chinese tourism knowledge graph(MCTKG)is proposed based on Beijing tourist attractions to support QA and help tourists plan tourism routes.An MCTKG ontology was constructed to maintain the semantic consistency of heterogeneous data sources.To increase the number of entities and relations related to the tourist attractions in MCTKG,entities were automatically expanded belonging to the concepts of building,organization,relic,and person based on Baidu Encyclopedia.In addition,based on the types of tourist attractions and the styles of tourism route,a tourism route generation algorithm was proposed,which can automatically schedule the tourism routes by incorporating tourist attractions and the route style.Experimental results show that the generated tourist routes have similar satisfaction comparedwith the tourism routes crawled from specific travel websites.