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1、空冷风机桥架振动可靠性分析蒋红梅，高峰北京首航艾启威节能技术股份有限公司摘要：在直接空冷系统中，风机桥架受到电动机和风机振动的影响，由于外载荷、几何尺寸、材料性能等方面存在着不确定因素使振动具有随机性，从而影响风机桥架的可靠度。本文利用ANSYS软件对桥架振动特性进行了分析，借助Campbell图找出危险共振点，考虑某一激振力频率的分布和与其最为接近的某一阶固有频率的分布的干涉模型，对桥架避开共振的可靠度进行计算。分别得到25%额定功率工况、50%额定功率工况、75%额定功率工况、100%额定功率工况和110%额定功率工况下工作的
2、风机桥架避开共振的可靠度，并借助桥架振动可靠性评估逻辑图（PFTA图）对这些危险共振点组成的串联特性的共振系统进行了振动可靠性计算。从而为风机桥架的设计及可靠性决策提供参考。关键词：空冷；风机桥架；振动；可靠性AnalysisofRreliabilityAnalysisofthefanbridgetrussinAaircoolingcondenserCCstructuresystemJiangHongmei，GaoFengBeijingShouhangIHWResourcesSavingTechnologyCo.,LtdAbstr
3、act:InACCstructuresystem,VibrationoffanbridgetrussinfluencevibrationcausedinducedbymotorandfaninACCstructuresystem,Thereliabilityofthefanbridgetrussisaffectedbyvibrationrandomness,whichdependsonrandomnessinsomeuncertainfactors,suchasloads,geometrysizes,materialpropert
4、ies,andsoon.ThevibrationcharacteristicsofthebridgetrussareanalyzedstudiedinthispaperbythewayofusingANSYSsoftwareanalysis,.dangerousDangerousresonancepointisidentifiedbymeansofCampbellgraph.Aninterferencemodelofwhichthefrequencydistributionoftheexcitingforceisclosedtoo
5、neofthenaturalfrequencydistributionisdiscussed,andthereliabilityofthebridgetrusstoavoidresonanceiscalculated.ThereliabilityofthefanbridgetrusstoavoidresonanceunderdDifferentconditionsofthereliabilityofthefanbridgetrusstoavoidresonanceareobtained,whichtheresultsreferst
6、o25percentratedpowercondition,50percentratedpowercondition,75percentratedpowercondition,100percentratedpowerconditionand110percentratedpowercondition,respectively.Withthehelpofbridgetrussvibrationreliabilityevaluationlogicmap(orso-calledProbabilityFaultTreeAnalysis),t
7、hevibrationreliabilityoftheTheseriessystemconsistingofthesedangerousresonancepointsarecalculatedproceeded.TheresultsisaniceRreferenceisprovidedfordecision-makingofthedesignandreliabilityofthefanbridgetruss.Keywords:air-coolingcondenser;fanbridgetruss;vibration;reliabi
8、lity空冷风机桥架是一种复杂的结构体系，300MW空冷机组空冷中一般布置30台风机，风机的开启工况也比较多，。空冷平台属于多点激振,且每台风机的转速不同、相位角也不相同,为多点随机振动过程,其结构受力及变形的因素一般都随着空间位置及时间的变化而变
