In computed tomography(CT)slip rings and similar applications,effective communication in rotating systems is critical,yet conventional slip ring methods are plagued by electromagnetic interference,low speeds,and high ...In computed tomography(CT)slip rings and similar applications,effective communication in rotating systems is critical,yet conventional slip ring methods are plagued by electromagnetic interference,low speeds,and high costs.In this work,we propose,to our knowledge,a novel fiber side-emitting communication system that employs the side-emitting fiber(SEF)as the optical transmitter to address these issues.An optical antenna with a gain of 9.6 dB enhances coupling efficiency,and a new SEF transmission model is developed.Experimental results demonstrate real-time data transfer at 1.25 Gbps with a bit error rate below 1×10^(-12),offering a robust and efficient solution for high-speed wireless communications in dynamic applications.展开更多
The electrically charged wear debris generated inside the conductive slip ring of spacecraft not only exacerbates the wear of the ring channel but also causes distortion of the electric field,which can induce surface ...The electrically charged wear debris generated inside the conductive slip ring of spacecraft not only exacerbates the wear of the ring channel but also causes distortion of the electric field,which can induce surface flashover in vacuum,seriously affecting the operational reliability of solar array panels.This study is based on the space station experimental cabin’s on-orbit technology testing platform,and it systematically investigates the wear debris migration behavior of the brush-slip ring mechanism.Through long-term on-orbit testing observations,a three-dimensional multiphysics coupling model was developed using a Monte Carlo-Finite Element joint algorithm.This model reveals the migration mechanism of wear debris under the combined effect of the electrostatic field and electron radiation field:debris without initial velocity primarily adheres to the metal ring surface;debris with initial velocity migrates towards the shield with a speed of up to 0.0136 m/s in the electrostatic field,while a small amount adheres to the side of the insulating baffle due to electric field distortion near the brush;under the electron radiation combined field,the surface potential reconstruction of the dielectric increases the local field strength to 2.2×10^(8)V/m,significantly enhancing the migration trend of the debris towards the insulating baffle and causing the debris on the inner side of the shield to detach and impact the baffle.The study accurately reproduced the spatial distribution characteristics of the wear debris and revealed the discharge behavior induced by the debris through trajectory prediction models and comparison with on-orbit experimental data.This provides theoretical support for the insulation reliability design of space electromechanical products.展开更多
西门子Definition AS CT目前是我院CT检查的主力机,日常检查量大、使用率高,故障频发。本文详细分析了电源模块供电异常导致的检查床故障,前滑环系统导致机架初始化失败故障,重建计算机参数表异常导致的图像异常故障等,并针对每例故障...西门子Definition AS CT目前是我院CT检查的主力机,日常检查量大、使用率高,故障频发。本文详细分析了电源模块供电异常导致的检查床故障,前滑环系统导致机架初始化失败故障,重建计算机参数表异常导致的图像异常故障等,并针对每例故障提出了具体的排查方法和解决方案。通过自主维修以最小的成本修复机器,可节省大量经费,保障医院和科室的正常运行,同时为同行维修此类故障提供参考。展开更多
基金supported by the China Postdoctoral Science Foundation(No.2024M760278)。
文摘In computed tomography(CT)slip rings and similar applications,effective communication in rotating systems is critical,yet conventional slip ring methods are plagued by electromagnetic interference,low speeds,and high costs.In this work,we propose,to our knowledge,a novel fiber side-emitting communication system that employs the side-emitting fiber(SEF)as the optical transmitter to address these issues.An optical antenna with a gain of 9.6 dB enhances coupling efficiency,and a new SEF transmission model is developed.Experimental results demonstrate real-time data transfer at 1.25 Gbps with a bit error rate below 1×10^(-12),offering a robust and efficient solution for high-speed wireless communications in dynamic applications.
文摘The electrically charged wear debris generated inside the conductive slip ring of spacecraft not only exacerbates the wear of the ring channel but also causes distortion of the electric field,which can induce surface flashover in vacuum,seriously affecting the operational reliability of solar array panels.This study is based on the space station experimental cabin’s on-orbit technology testing platform,and it systematically investigates the wear debris migration behavior of the brush-slip ring mechanism.Through long-term on-orbit testing observations,a three-dimensional multiphysics coupling model was developed using a Monte Carlo-Finite Element joint algorithm.This model reveals the migration mechanism of wear debris under the combined effect of the electrostatic field and electron radiation field:debris without initial velocity primarily adheres to the metal ring surface;debris with initial velocity migrates towards the shield with a speed of up to 0.0136 m/s in the electrostatic field,while a small amount adheres to the side of the insulating baffle due to electric field distortion near the brush;under the electron radiation combined field,the surface potential reconstruction of the dielectric increases the local field strength to 2.2×10^(8)V/m,significantly enhancing the migration trend of the debris towards the insulating baffle and causing the debris on the inner side of the shield to detach and impact the baffle.The study accurately reproduced the spatial distribution characteristics of the wear debris and revealed the discharge behavior induced by the debris through trajectory prediction models and comparison with on-orbit experimental data.This provides theoretical support for the insulation reliability design of space electromechanical products.
文摘西门子Definition AS CT目前是我院CT检查的主力机,日常检查量大、使用率高,故障频发。本文详细分析了电源模块供电异常导致的检查床故障,前滑环系统导致机架初始化失败故障,重建计算机参数表异常导致的图像异常故障等,并针对每例故障提出了具体的排查方法和解决方案。通过自主维修以最小的成本修复机器,可节省大量经费,保障医院和科室的正常运行,同时为同行维修此类故障提供参考。
