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tree attachment中文是什么意思

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  • Different vibration characteristics between the two models are discussed . geometry mismatch in a turbine blade root , which arose in manufacturing process or caused by wearing out during service , leads to contact conditions changed in fir - tree attachments
    汽輪機葉根制造尺寸誤差或運行磨損造成的尺寸改變會導(dǎo)致葉根與輪盤接觸狀態(tài)變化,進而引起葉片固有頻率發(fā)生漂移,并有可能接近共振頻率而導(dǎo)致葉片事故。
  • As a result , shifting of the fundamental frequencies and redistribution of stress in the blade base possibly cause failure of the blade . a three - dimensional finite element model of a blade and its fir - tree attachments have been constructed and analyzed with taking into account of contact nonlinearity in the attachments and large deformation effect of the blade . the geometry mismatch was introduced into the finite element model by defining gaps between two contact surfaces in the attachments
    分析結(jié)果表明葉根誤差發(fā)生的位置對葉片彎曲振型的固有頻率影響較大,對扭轉(zhuǎn)振型影響較小;誤差的大小對葉片各階固有頻率影響均較小,但對葉根應(yīng)力分布有影響;比較發(fā)現(xiàn),在計算固有頻率時,將葉片在葉根處簡單地處理成固支位移邊界是不合理的。
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