对于火电厂主蒸汽系统平行双闸板闸阀高温高压工况下密封性能恶化的这一技术难题,本文提出楔形补偿方案,采用15°楔形角动态补偿机构,由介质压力驱动自身完成热变形和密封应力的自适应匹配;零摩擦启闭结构、双向自增强密封面设计使...对于火电厂主蒸汽系统平行双闸板闸阀高温高压工况下密封性能恶化的这一技术难题,本文提出楔形补偿方案,采用15°楔形角动态补偿机构,由介质压力驱动自身完成热变形和密封应力的自适应匹配;零摩擦启闭结构、双向自增强密封面设计使应力波动减小了67%,5000次循环磨损量≤0.05 mm,泄漏率稳定在了0.007 mL/min之内,均优于工业标准ISO15848-1 Class VI标准值。工程使用表明,该技术可以将每年的维修费降低了82.8%,密封面粗糙度下降了50%,实现了无卡痕运转,为高参数机组阀门的设计提供了技术支持,极大提高了火电设备的长周期可靠运行。展开更多
This article, in order to precisely impose friction on aircraft and weapon actuation systems, presents a new friction loading method characteristic of ＂torque-zero velocity＂ switching control with an electro-hydraul...This article, in order to precisely impose friction on aircraft and weapon actuation systems, presents a new friction loading method characteristic of ＂torque-zero velocity＂ switching control with an electro-hydraulic load simulator. As the general Stribeck friction model has little related to static friction, it proposes a ＂torque-zero velocity＂ switcher, in which a zero-velocity controller is developed to load the static friction and a torque controller the kinetic friction. With the help of mathematical modeling, this article designs a ＂torque-zero velocity＂ switching controller and, correspondingly, provides a ＂dual-threshold judgment＂ algorithm. Simulation results indicate that the proposed method can be successfully used to carry out the static and kinetic friction simulation with an electro-hydraulic load simulator.展开更多
文摘对于火电厂主蒸汽系统平行双闸板闸阀高温高压工况下密封性能恶化的这一技术难题,本文提出楔形补偿方案,采用15°楔形角动态补偿机构,由介质压力驱动自身完成热变形和密封应力的自适应匹配;零摩擦启闭结构、双向自增强密封面设计使应力波动减小了67%,5000次循环磨损量≤0.05 mm,泄漏率稳定在了0.007 mL/min之内,均优于工业标准ISO15848-1 Class VI标准值。工程使用表明,该技术可以将每年的维修费降低了82.8%,密封面粗糙度下降了50%,实现了无卡痕运转,为高参数机组阀门的设计提供了技术支持,极大提高了火电设备的长周期可靠运行。
基金National Natural Science Foundation of China （50825502）
文摘This article, in order to precisely impose friction on aircraft and weapon actuation systems, presents a new friction loading method characteristic of ＂torque-zero velocity＂ switching control with an electro-hydraulic load simulator. As the general Stribeck friction model has little related to static friction, it proposes a ＂torque-zero velocity＂ switcher, in which a zero-velocity controller is developed to load the static friction and a torque controller the kinetic friction. With the help of mathematical modeling, this article designs a ＂torque-zero velocity＂ switching controller and, correspondingly, provides a ＂dual-threshold judgment＂ algorithm. Simulation results indicate that the proposed method can be successfully used to carry out the static and kinetic friction simulation with an electro-hydraulic load simulator.
