阶跃函数模型在龙江水电站压力钢管监测中的应用

Application of Step Function Model to Steel Penstock Monitoring of Longjiang Hydropower Station

针对金属结构安全是水电站引水系统安全稳定运行的关键问题,监测了云南省龙江水电站引水隧洞压力钢管在施工期及充水试验时钢板的应力情况,综合分析了钢板应力的变化规律,结合施工期及充水试验时钢板应力的变化特点,采用阶跃函数建立了钢板应力监控模型,并与传统的统计模型进行比较。结果表明,该模型精度明显优于传统统计模型,可准确反映引水隧洞在施工期及充水试验时压力钢管钢板应力状态,且能通过监控模型分析将安全监测结果与实际工况有机结合,提高了安全监测结果对实际工况的反馈效果。

The metal structure safety is a key problem of the stable operation of hydropower diversion system.The stress state of steel plates is monitored during the construction and filling water test periods of Longjiang hydropower statioa in Yunnan Province, and the stress change rule is analyzed compreiaensivety. With the vartation characteristics steel plate stress during the construction and filling water test periods, step function is adopted to establish the monitoring model of steel plate stress. Compared with the traditional statistical model, the results show that the fitting accuracy of step function model is significantly better than that of traditional model; it can reflect the steel plate stress state during the construction and filling water test periods precisely; according to the effective combination of monitoring model analysis and actual working condition, the feedback performance of safety monitoring data to actual working condition is improved.