發(fā)布時間：2018-06-25 00:10

  本文選題：法向 + 接觸　； 參考：《機床與液壓》2017年19期

【摘要】：通過試驗研究了鑄鐵結(jié)合部在法向階躍激勵下的變形響應(yīng)規(guī)律,發(fā)現(xiàn)階躍響應(yīng)曲線存在明顯的瞬時彈性部分和持續(xù)時間較長的、漸變的黏性部分,并且在不同激振幅值和預(yù)緊力作用下,黏性部分大約是總變形的1/3,并且保持不變,這些現(xiàn)象無法用結(jié)合部建模中經(jīng)常采用的Kelvin-Voigt模型反映,為此提出了一種新的結(jié)合部法向特性的建模方法。首先介紹了研究采用的試驗原理和試驗裝置,分析了結(jié)合部在階躍激勵下的變形響應(yīng)特點,研究了Kelvin-Voigt模型和黏彈性分析中常用的三元件模型在結(jié)合部建模中存在的問題,在此基礎(chǔ)上將三元件模型加以改造,提出一種適合結(jié)合部建模的四元件模型。最后將該模型的階躍響應(yīng)與試驗結(jié)果進行了比較,結(jié)果表明提出的模型能更準確地反映結(jié)合部法向的黏彈性性質(zhì)。
[Abstract]:The deformation response of cast iron joint under normal step excitation is studied. It is found that the step response curve has obvious instantaneous elastic part and long duration and gradual viscosity part. And under the action of different exciting amplitude and pretightening force, the viscosity part is about 1 / 3 of the total deformation and remains unchanged. These phenomena can not be reflected by Kelvin-Voigt model, which is often used in joint modeling. In this paper, a new modeling method for the normal characteristic of joint is proposed. Firstly, the experimental principle and experimental device used in the study are introduced, and the characteristics of deformation response of the joint under step excitation are analyzed, and the problems of Kelvin-Voigt model and the three-element model commonly used in viscoelastic analysis in the joint modeling are studied. On this basis, the three-element model is modified and a four-element model suitable for joint modeling is proposed. Finally, the step response of the model is compared with the experimental results. The results show that the proposed model can more accurately reflect the viscoelastic properties of the joint in normal direction.
【作者單位】： 西安職業(yè)技術(shù)學(xué)院電子信息工程系;西安理工大學(xué)機械與精密儀器學(xué)院;
【基金】：國家重點基礎(chǔ)研究發(fā)展計劃(2009CB724406) 國家科技重大專項(2009ZX04014-032) 西安理工大學(xué)科技創(chuàng)新計劃(102-210916) 陜西省教育廳科學(xué)研究計劃(08JK393)
【分類號】：TB115;TG502
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本文編號：2063614