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ID:32683456
大小:1.02 MB
页数:7页
时间:2019-02-14
《分析气动式振动台激振器低温失效机理研究及结构改进》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、学兔兔www.xuetutu.com第48卷第2期机械工程学报VO1.48NO.22012年1月JOURNAL0FMECHANICALENGINEERINGJan.2O12DoI:10.3901/JIⅥE.2012.02.050气动式振动台激振器低温失效机理研究及结构改进木陶俊勇刘彬陈循(国防科学技术大学可靠性实验室长沙410073)摘要:气动式激振器是给可靠性强化试验设备气动式振动台提供激励信号的核心部件。针对气动式激振器在低温试验环境中无法工作的问题,研究其低温失效机理,建立理论分析模型;根据模型从激振器缸体材料、尺寸和内外壁温差三方面对气动式激振器结构进行优化设计
2、,加工完成以加热膜为核心组件的气动式低温激振器样品,并给出温控方法;考察低温激振器样品的加热均匀性、加热效率和耐振性,并分别测试低温和常温环境中样品端部的激励响应。结果表明,该低温激振器样品的低温工作性能比原激振器有很大提升,能在低温环境中长时间稳定工作,且在低温和常温环境中端部的激励响应特性比较接近,验证新型低温激振器设计方案的可行性,对于拓展气动式振动台的应用范围有着积极作用。关键词:气动式振动台低温失效机理结构改进气动式低温激振器低温测试中图分类号:TH692StudyonPerformanceandOptimalDesignofPneumaticVibrator
3、ofRepetitiveShockMachineonColdSoakTemperatureTAOJtmyongLIUBinCHENXun(ReliabilityLaboratory,N~ionalUniversityofDefenseTechnology,Changsha410073)Abstract:Pneumaticvibrator,whichproducesexcitationsignals,isoneofthemostimportantpartofrepetitiveshockmachine.Inlowtemperaturecondition,pneumatic
4、vibratorcannotworkasusua1.Inordertosolvethisproblem,firstlythefailuremechanismisstudiedbytheorymode1.Thenthestructureofthepneumaticvibratorisamelioratedbythewaysofchoosingappropriatestufanddimensionsofthecylinder,andminishingthegapintemperaturebetweentheinsideandoutsideofthecylinder.Them
5、ethodofcontrollingtemperatureisbroughtforwardaccordingtothemode1.Finallyapneumaticvibratorofcoldtemperatureismade,whosedurabilityofrepetitiveshockanduniformityandeficiencyofcalefactionistestedinlowtemperatureconditions,andwhoseresponsecharacteristicofexcitationontheroofistestedinlowandro
6、omtemperaturecondition,respectively.Theresultsshowthattheworkingcapabilityinlowtemperatureconditionofthenewlydesignedvibratorismuchbetterthanthatoftheprimaryone,andthatitCanworknormallyandcontinuouslyinlowtemperaturecondition,andthattheresponsecharacteristicsofexcitationinlowandroomtempe
7、ratureconditionareaccordant,whichvalidatestheavailabilityofthenewpneumaticvibratorinpractice.Keywords:RepetitiveshockmachineFailuremechanisminlowtemperatureconditionStructureimprovementPneumaticvibratorofcoldtemperatureTestsinlowtemperaturecondition振器对振动台面的反复冲击,实现了一种幅值概率0
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