球阀动水关闭过程中球阀与机组稳定性分析  

Stability analysis of ball valves and units in ball valve dynamic water closing process

作　　者：张飞 唐拥军 王国柱 邓磊 

机构地区：[1]国网新源控股有限公司技术中心,北京100161 [2]河北张河湾蓄能发电有限责任公司运维检修部,石家庄050399

出　　处：《振动与冲击》2017年第8期244-249,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金资助项目(51309258);国家电网公司科技项目(52573016001G)

摘　　要：采用短时傅里叶变换方法,针对某抽水蓄能电站水泵水轮发电机组球阀动水关闭过程中机组及球阀的试验数据进行了分析,研究了球阀动水关闭前、后及过程中机组及球阀的主要频率成分变化情况。研究结果表明:稳态工况下球阀及机组存在明显的100Hz频率成分,该频率成分主要由两倍的叶片通过频率产生而非电机极频振动产生;两倍叶片过流频率具有向上传播的特性,加剧了机组与球阀的振动。Based on measured data from one pumped storage power station, stability parameters of pumped storage unit and ball valve have been analyzed by short time Fourier transform. Frequency changes of the ball valve and unit during ball valve closing in dynamic water conditions have been summarized. The research shows that the unit and ball valve vibrations involve a 100 Hz component in stable running condition. And the 100 Hz component mainly results from two-fold blade passing frequency not from generator polar frequency; the two-fold blade passing frequency component propagates upward and aggravates the vibrations of unit and ball valve. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.

关 键 词：短时傅里叶变换 稳定性参数 极频振动 叶片过流频率 球阀动水关闭 

分 类 号：TV734[水利工程—水利水电工程]