基于BIM三维技术的城市轨道交通工务线路质量闭环管理系统关键技术研究

基于BIM三维可视化技术,结合GIS、物联网等多种信息化手段,搭建用于工务轨道专业业务结合的综合数字信息化平台,通过PC+移动等终端实现设备管理履历及病害管理、检查监控、维修管理闭环的全生命周期管理功能,为城市轨道交通工务系统提供基于多视图、高精度、多源数据分析的可视化智能运维管理服务。系统基于线路检查、轨检车、添乘仪等多种检查手段的检查结果,融合平台线路几何尺寸质量自动分析算法,对线路各个设备单元进行质量评价,并结合质量评价结果进行针对性超限派工,现场作业维修人员支持通过移动端返填维修整治结果,完成设备单元质量病历的闭环更新。

基于三维激光扫描的电力线路工程全周期质量管理建构

在当今时代,电力系统是日常生活中的关键部分。为了保证线路工程的质量,本文首先采用三维激光扫描技术对线路工程的范围和环境展开扫描,获取相关的数据。其次,采用数据去噪方法去除点云数据中的噪声,为后续的质量管理提供基础。最后,建立线路工程质量管理模型,以此完成对线路工程质量的管理和分析,使线路工程的完成效率得到提高。从扫描精度和施工失误率两方面分析三维激光扫描线路质量管理模型的效果,结果表明,所提方法的施工失误率,在3%左右,扫描精度较高,与实际区域相符,一般在98%左右,证明所提方法的能够降低施工过程中的质量问题,可以对施工中出现的问题展开纠正,提高施工的效率,降低成本,推动现代工程的发展。

Investigation of Adaptive Multi-Rate Link Adaptation of 3G System

In term of the features of 3G system, a novel AMR link adaptation strategy for 3G system is proposed. The impacts of AMR codec modes and power control on traffic quality of service are taken into account in the strategy at the same time. By synthetically comparing the signal-to-interference ratio value with the switching threshold and comparing the transmission power with its threshold, radio resource management can always keep each link on its proper codec mode with the corresponding optimal power level to achieve both robust speech quality and link capacity enhancement. Based on the WCDMA FDD uplink link-level simulation platform, AMR link adaptation platform is constructed. Simulation results show that the algorithm can track the fast change of channel conditions and select the most robust codec mode, thus the synthetic speech quality of AMR is better than that of signal mode during a wide range of channel conditions. The result will provide a reference strategy for AMR link adaptation of 3G system.