機械專業(yè)畢業(yè)論文中英文翻譯--在全接觸條件下，盤式制動器摩擦激發(fā)瞬態(tài)熱彈性不穩(wěn)定的研究-文庫吧在線文庫
【正文】 lecting various imperfections and random fluctuations or by the impossibility to describe all possible influences appropriately. Therefore, some effort aroused to interpret results of certain experiments in addition to classical TEI (see, ). This paper is related to the work by Lee and Barber [7].Using an analytical approach, it treats the inception of TEI and the development of hot spots during the full contact regime in the disc brakes. The model proposed in Section 2 enables to cover finite thickness of both friction pads and the ribbed portion of the disc. Section 3 is devoted to the problems of modeling of partial disc surface contact with the pads. Section 4 introduces the term of ‘‘thermal capacity of perturbation’’ emphasizing its association with the value of growth rate, or the sliding velocity magnitude. An analysis of the disc friction surfaces nonflatness and its influence on initial amplitude of perturbations is put forward in the Section 5. Finally, the Section 6 offers a model of temperature perturbation development initiated by the mentioned initial disc nonflatness in the course of braking. The model being in use here es from a differential equation that covers the variation of the‘‘thermal capacity’’ during the full contact regime of the braking. 2. Elaboration of Lee and Barber model The brake disc is represented by three layers. The middle one of thickness 2a3 stands for the ribbed portion of the disc with full sidewalls of thickness a2 connected to it. The pads are represented by layers of thickness a1, which are immovable and pressed to each other by a uniform pressure p. The brake disc slips in between these pads at a constant velocity V. We will investigate the conditions under which a spatially sinusoidal perturbation in the temperature and stress fields can grow exponentially with respect to the time in a similar manner to that adopted by Lee and Barber. It is evidenced in their work [7] that it is sufficient to handle only the antisymmetric problem. The perturbations that are symmetric with respect to the midplane of the disc can grow at a velocity well above the sliding velocity V thus being made uninteresting. Let us introduce a coordinate system （ x1。因此，在過去十年， 人們通過 大量 建模 實驗來 研究 盤式制動閘的摩擦 熱 彈性 的不穩(wěn)定性的可能導(dǎo)致的影響 。受熱區(qū)域 1,介紹 在盤式制動器制動過程或者是在傳輸過程離合器的接觸過程中 ,過熱區(qū)域的形成以及非均勻接觸壓力分布是一種不希望出現(xiàn)的效果 .如果滑動速度足夠高的話 ,這種效應(yīng)會 變得極不穩(wěn)定 ,有可能會導(dǎo)致盤式制動器摩擦介質(zhì)受損 ,發(fā)出振動 ,
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