防振条间隙对蒸汽发生器U形管固有频率影响敏感性分析
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摘要
为满足安装与制造的要求,在蒸汽发生器U形管部位防振条与换热管乊间存在一定量的间隙,从而导致了防振条约束强度的不确定性,因此对其间隙进行敏感性分析十分必要。通过数值模拟中的模态分析,采用弹簧刚度表征防振条间隙对支撑强度的影响。结果显示,当防振条全部完全失效时,对1阶固有频率的影响较大,可使其减小88.15%;单点约束失效对固有频率影响较小,最大仅可使1阶固有频率减小2.65%;各个支撑位置中,临近直管段且连续的2点约束失效时影响最大,可使1阶固有频率减小23.58%。
In order to meet the requirements of installation and manufacturing, there is a certain gap between the anti-vibration bar and the tube in the part of the U tube of the steam generator. This gap leads to the uncertainty of the restraining strength of the anti-vibration bar, so it is necessary to carry out the sensitivity analysis of the gap. Through the modal analysis in numerical simulation, the spring stiffness is used to characterize the effect of the anti-vibration bar gap on the restraining strength. The results show that when the anti-vibration bar is completely failed, it has great effect on the first natural frequency, which can reduce it by 88.15%. The single point constraint failure has little effect on the natural frequency, and it can only reduce the first natural frequency by 2.65% to the maximum. In each supporting position, the continuous two point constraint near the straight tube has the greatest effect, and the first natural frequency can be reduced by 23.58%.
In order to meet the requirements of installation and manufacturing, there is a certain gap between the anti-vibration bar and the tube in the part of the U tube of the steam generator. This gap leads to the uncertainty of the restraining strength of the anti-vibration bar, so it is necessary to carry out the sensitivity analysis of the gap. Through the modal analysis in numerical simulation, the spring stiffness is used to characterize the effect of the anti-vibration bar gap on the restraining strength. The results show that when the anti-vibration bar is completely failed, it has great effect on the first natural frequency, which can reduce it by 88.15%. The single point constraint failure has little effect on the natural frequency, and it can only reduce the first natural frequency by 2.65% to the maximum. In each supporting position, the continuous two point constraint near the straight tube has the greatest effect, and the first natural frequency can be reduced by 23.58%.
引文
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[2]崔素文,朱勇,任红兵.防振条对蒸汽发生器传热管完整性的影响分析[J].核动力工程,2016,37(6):109-112.
[3]武伟让.蒸汽发生器防振条偏转视频检查技术[C]//北京理工大学.2015远东无损检测新技术论坛-基于大数据的无损检测论文集.北京:远东无损检测新技术论坛,2015.
[4]NOWLAN I,ROSS A,PETTIGREW M J.Dynamic interaction between a straight tube and an anti-vibration bar[C]//ASME 2009 Pressure Vessels and Piping Conference.Czech,Prague.2009:437-445.
[5]LALONDE V,ROSS A,PETTIGREW M J,et al.Experimental study of dynamic interaction between a steam generator tube and an anti-vibration bar[C]//ASME 2010,Joint Us-European Fluids Engineering Summer Meeting Collocated with,International Conference on Nanochannels,Microchannels,and Minichannels.2010.
[6]国家质量监督检验检疫总局、国家标准化管理委员会.热交换器:GB/T 151-2014[S].北京:中国标准出版社,2014:134-167.
[7]韩良弻,施国麟,姚伟达,等.蒸汽发生器传热管固有振动试验和分析研究[J].核科学与工程,1985,01:23-33,7-8.
[8]刘敏珊,王素珍,董其伍.防振条对蒸汽发生器U形管动态特性影响研究[J].郑州大学学报(工学版),2008,29(2):48-51.
[9]余雏麟,邓科,季敏东,等.带V形支撑的大型U形管式高压加热器固有频率计算[J].石油和化工设备,2015,18(01):5-8.
[10]代勤龙.防振条位置的涡流检测[J].无损检测,2016,38(10):18-20.
[11]刘振凤,赫玱波.CPR1000蒸汽发生器的结构分析[J].一重技术,2010,(3):17-20.