In this paper, the effect of pulse-type motions caused by forward directivity that can release huge amounts of energy in a short time period is studied on a telecommunication tower. Since telecommunication towers have...In this paper, the effect of pulse-type motions caused by forward directivity that can release huge amounts of energy in a short time period is studied on a telecommunication tower. Since telecommunication towers have longer periods, they are not as affected by seismic forces. Nevertheless, near source earthquakes characterized by high velocity and velocity pulses can change the behavior of these structures. For this reason, a telecommunication tower located near active faults was selected in this study. Considering the probable earthquake magnitude at the site and the distance of the tower from adjacent faults, nine simulated pulses and three near-fault earthquake records with forward directivity are selected and applied to a 3D finite element model of the tower. The results of nonlinear dynamic analysis, i.e., displacements and damage in the tower, indicate that the maximum displacement and drift ratio of the tower under the pulses are obviously affected by the ratio of the structure period to pulse period. When this ratio is decreased and close to 1.0, the maximum displacement and drift ratio are sharply increased and cause large displacements in the tower.展开更多
针对工业4.0场景下AC/DC电源模块监测功能离散化、故障溯源困难等问题,提出一种内置多维度监测的智能电源系统。通过三模采集电路(电压/电流/温度)、动态阈值算法及冗余报警优化设计,构建实时监测网络与维护平台。关键技术突破包括:基...针对工业4.0场景下AC/DC电源模块监测功能离散化、故障溯源困难等问题,提出一种内置多维度监测的智能电源系统。通过三模采集电路(电压/电流/温度)、动态阈值算法及冗余报警优化设计,构建实时监测网络与维护平台。关键技术突破包括:基于霍尔传感器与软件校正的非接触式电流采集方案、双电源协同供电机制、故障预警与动态阈值配置功能。经8000台设备验证,系统将平均修复时间(Mean Time to Repair,MTTR)降低83%,可用性提升至99.99971%。为工业设备电源可靠性提升与智能化运维提供可复用的技术范式。展开更多
文摘In this paper, the effect of pulse-type motions caused by forward directivity that can release huge amounts of energy in a short time period is studied on a telecommunication tower. Since telecommunication towers have longer periods, they are not as affected by seismic forces. Nevertheless, near source earthquakes characterized by high velocity and velocity pulses can change the behavior of these structures. For this reason, a telecommunication tower located near active faults was selected in this study. Considering the probable earthquake magnitude at the site and the distance of the tower from adjacent faults, nine simulated pulses and three near-fault earthquake records with forward directivity are selected and applied to a 3D finite element model of the tower. The results of nonlinear dynamic analysis, i.e., displacements and damage in the tower, indicate that the maximum displacement and drift ratio of the tower under the pulses are obviously affected by the ratio of the structure period to pulse period. When this ratio is decreased and close to 1.0, the maximum displacement and drift ratio are sharply increased and cause large displacements in the tower.
文摘针对工业4.0场景下AC/DC电源模块监测功能离散化、故障溯源困难等问题,提出一种内置多维度监测的智能电源系统。通过三模采集电路(电压/电流/温度)、动态阈值算法及冗余报警优化设计,构建实时监测网络与维护平台。关键技术突破包括:基于霍尔传感器与软件校正的非接触式电流采集方案、双电源协同供电机制、故障预警与动态阈值配置功能。经8000台设备验证,系统将平均修复时间(Mean Time to Repair,MTTR)降低83%,可用性提升至99.99971%。为工业设备电源可靠性提升与智能化运维提供可复用的技术范式。
