空冷风机桥架疲劳寿命分析
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摘要
基于现场实测风机桥架振动响应,采用风机调幅扰力模型进行结构动力响应分析。根据不同工况下疲劳危险点的名义应力时程,采用雨流计数法和各工况年运行频次调查结果编制疲劳载荷谱。通过Miner损伤累积准则和p-S-N关系对风机桥架进行疲劳损伤分析,给定疲劳破坏的损伤阈值,所得疲劳寿命满足设计使用年限的要求。采用Goodman、Gerber和Soderberg模型考虑平均应力影响时的疲劳寿命略有降低。
Based on the in-situ tested vibration responses of an air-cooling fan bridge,the dynamic analysis is performed with modulation amplitude disturbing force model of draught fans.Rainflow method is used to count stress cycles and the fatigue load spectrum of air-cooling fan bridges is then programmed combined with investigation results of running frequencies of different operation modes per year.Fatigue damage to the air-cooling fan bridge is calculated in terms of Miner’s cumulative damage rule and design p-S-N curve.After giving the damage threshold corresponding to fatigue failure,the predicted fatigue life of the fan bridge is longer than the designed service life.Furthermore,the fatigue life slightly decreases as effects of mean stress are taken into consideration by Goodman’s,Gerber’s and Soderberg’s models.
Based on the in-situ tested vibration responses of an air-cooling fan bridge,the dynamic analysis is performed with modulation amplitude disturbing force model of draught fans.Rainflow method is used to count stress cycles and the fatigue load spectrum of air-cooling fan bridges is then programmed combined with investigation results of running frequencies of different operation modes per year.Fatigue damage to the air-cooling fan bridge is calculated in terms of Miner’s cumulative damage rule and design p-S-N curve.After giving the damage threshold corresponding to fatigue failure,the predicted fatigue life of the fan bridge is longer than the designed service life.Furthermore,the fatigue life slightly decreases as effects of mean stress are taken into consideration by Goodman’s,Gerber’s and Soderberg’s models.
引文
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[2]白国良,赵更歧,赵春莲,等.单跨空冷支架结构挡风墙阵风系数风洞试验研究[J].西安建筑科技大学学报:自然科学版,2009,41(1):1-5.BAI Guoliang,ZHAO Gengqi,ZHAO Chunlian,et al.Wind tunnel test for gustiness factor of wind 2 bread wall of the single-span air-cooled con-denser structure system[J].Journal of Xi’an University of Architecture and Technology:Natural Science Edition,2009,41(1):1-5.(in Chi-nese)
[3]屈铁军,窦瑞杰,安栋.电厂直接空冷风机系统扰力测试研究[J].地震工程与工程振动,2010,30(4):80-83.QU Tiejun,DOU Ruijie,AN Dong.Measurement of disturbing force caused by direct air-cooling fans of power station[J].Journal of EarthquakeEngineering and Engineering Vibration,2010,30(4):80-83.(in Chinese)
[4]屈铁军,王献云,窦瑞杰,等.直接空冷系统风机运行扰力试验研究[J].土木工程学报,2011,44sup:71-80.QU Tiejun,WANG Xianyun,DOU Ruijie,et al.Experimental research of oscillation forces of fans in operation of direct air cooling system[J].China Civil Engineering Journal,2011,44 sup:71-80.(in Chinese)
[5]王勇强,雷平和,田树桐,等.空冷风机桥动力计算[J].电力建设,2011,32(1):12-14.WANG Yongqiang,LEI Pinghe,TIAN Shutong,et al.Dynamic calculation of fan bridge of direct air-cooling system[J].Electric Power Con-struction,2011,32(1):12-14.(in Chinese)
[6]徐亚洲,刘林,白国良.大型直接空冷系统风机桥架振动分析[J].中国电机工程学报,2011,31Sup:161-164.XU Yazhou,LIU Lin,BAI Guoliang.Vibration analysis of fan bridge in direct air cooled condenser system subjected to running large draught fans[J].Proceedings of the CSEE,2011,32(1):12-14.(in Chinese)
[7]胡毓仁,李典庆,陈伯真.船舶与海洋工程结构疲劳可靠性分析[M].哈尔滨:哈尔滨工程大学出版社,2010:39-45.HU Yuren,LI Dianqing,CHEN Baizhen.Fatigue reliability analysis of ship and marine structures[M].Harbin:Harbin Engineering UniversityPress,2010:39-45.(in Chinese)
[8]British Standard Institute.Code of Practice for Fatigue Design and Assessment of Steel Structures[S].BS7608,1993.
[9]GB50017-2003钢结构设计规范[S].GB50017-2003 Code for Design of Steel Structures[S].
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