機(jī)械專(zhuān)業(yè)畢業(yè)論文中英文翻譯--在全接觸條件下，盤(pán)式制動(dòng)器摩擦激發(fā)瞬態(tài)熱彈性不穩(wěn)定的研究(已修改)
2025-06-01 00:19 本頁(yè)面
【正文】 Frictionally excited thermoelastic instability in disc brakes— Transient problem in the full contact regime Abstract Exceeding the critical sliding velocity in disc brakes can cause unwanted forming of hot spots, nonuniform distribution of contact pressure, vibration, and also, in many cases, permanent damage of the disc. Consequently, in the last decade, a great deal of consideration has been given to modeling methods of thermo elastic instability (TEI), which leads to these effects. Models based on the finite element method are also being developed in addition to the analytical approach. The analytical model of TEI development described in the paper by Lee and Barber [Frictionally excited thermo elastic instability in automotive disk brakes. ASME Journal of Tribology 1993。115:607–14] has been expanded in the presented work. Specific attention was given to the modification of their model, to catch the fact that the arc length of pads is less than the circumference of the disc, and to the development of temperature perturbation amplitude in the early stage of breaking, when pads are in the full contact with the disc. A way is proposed how to take into account both of the initial nonflatness of the disc friction surface and change of the perturbation shape inside the disc in the course of braking. Keywords: Thermo elastic instability。 TEI。 Disc brake。 Hot spots 1. Introduction Formation of hot spots as well as nonuniform distribution of the contact pressure is an unwanted effect emerging in disc brakes in the course of braking or during engagement of a transmission clutch. If the sliding velocity is high enough, this effect can bee unstable and can result in disc material damage, frictional vibration, wear, etc. Therefore, a lot of experimental effort is being spent to understand better this effect (cf. Refs.) or to model it in the most feasible fashion. Barber described the thermo elastic instability (TEI)as the cause of the phenomenon. Later Dow and Burton and Burton et al. introduced a mathematical model to establish critical sliding velocity for instability, where two thermo elastic halfplanes are considered in contact along their mon interface. It is in a work by Lee and Barber that the effect of the thickness was considered and that a model applicable for disc brakes was proposed. Lee and Barber’s model is made up with a metallic layer sliding between two half
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