| 1 | Self-healing of microcapsule-based materials for highway construction:A review显示文摘Maintaining the health and reliability of civil facilities is of strategic importance.In highway engineering,pavement cracking impairs the road service and travel comfort level,while structure cracking can cause catastrophic damage.Microcapsule-based self-healing materials offer solutions to auto-recovery micro-cracks and maintain structural health.Such solution has become available by laboratory synthesis and proved effective in addressing the cracking problem during long-term mechanical,thermal,and hydraulic conditions.However,full-scale applications of this technique are not prevalent,showing its potential limitations in highway engineering.Crack healing in highways is a big topic,therefore,this review has two insertion points.(1)We focus on the cracking issues on two specific materials:asphalt and concrete,which account for the vast majority of all the materials used in pavement and structures in highways.(2)Instead of the laboratory studies,we pay more attention to the practical applications,the meaning of healing performance,and the adverse effects of microcapsules to the main structural components(i.e.,tunnel lining,bridge piers and beams)and pavement in highways.The practical significance of self-healing materials in highway projects was discussed from the three aspects:strength,durability,and stress redistribution.The difficulty in applying this new technique is also discussed from economic perspective.For future-proofing,a material evaluation system that fits the load condition is required.The self-healing technique brings composites a chance to interact with the environment,showing high potential for contributing to the development of various types of long-lasting infrastructures. | Enlin Ma Xi Chen Jinxing Lai Xiangze Kong Chunxia Guo | 2023 | Journal of Traffic and Transportation Engineering(English Edition)2023，10，3： | 0 |
| 2 | Optimal Designs of Wound Field Switched Flux Machines with Different DC Windings Configurations显示文摘Wound field switched flux(WFSF)machines exhibits characteristics of the simple robust rotor,flexible flux-adjustable capability,and no risk of demagnetization.However,they suffer from a poor torque density compared with permanent magnet machines due to the saturation.Therefore,in this paper,two WFSF machines with single-and double-layer DC windings,respectively,are optimized for the maximum torque.The end-winding(EW)lengths differ in these two machines,which can affect the optimal design.Design parameters including the DC to armature winding copper loss ratio,slot area ratio and split ratio are optimized when two machines have the same copper loss and overall sizes.In addition,the influence of the flux density ratio,total copper loss,air-gap length and aspect ratio on the optimal split ratio is investigated using the finite element method and results are explained through the analytical model accounting for the saturation.It is discovered that the EWs have no effect on the optimal copper loss ratio,which is unity.In terms of the slot area ratio,the machine with single-layer DC windings prefers smaller DC slot areas than armature slot areas.In the WFSF machine with longer EWs,the optimal split ratio becomes smaller.Moreover,compared with other parameters,the flux density ratio can significantly affect the optimal split ratio. | Wenting Wang Yuankui Wang Enlin Ma Lijian Wu | 2022 | CES Transactions on Electrical Machines and Systems2022，6，4： | 0 |
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