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英语小作文一篇不少于50字的小作文,关于服装店卖服装的,流畅点.是一则广告
英语小作文
一篇不少于50字的小作文,关于服装店卖服装的,流畅点.
是一则广告

英语小作文一篇不少于50字的小作文,关于服装店卖服装的,流畅点.是一则广告
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Bearing rotor system is a core component of the large rotating machinery equipment of aviation engine, compressor and turbine etc., its dynamics problem by theoretical analysis and numerical simulatio...

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Bearing rotor system is a core component of the large rotating machinery equipment of aviation engine, compressor and turbine etc., its dynamics problem by theoretical analysis and numerical simulation can not solve, must be combined with physical experiments. However, in practical engineering, the prototype test has many limitations: geometric constraints, the rotary table power and space constraints, the difficult test, high test cost and long testing cycle etc.. The similarity model test is a research method of conventional [1]. While the rolling ball bearing is an important support bearing rotor system, the dynamic similarity problem is very important to study the [2-3] about the similar research bearing dynamics development time earlier, but the literature does not see more. As early as in 1969, Constantinescu obtains the dynamic similarity criterion [4] bearing steady gas lubrication film. In 1980, Gross by using dimensional analysis method were also analyzed with [5] similar. In 2006, Yang Ruping, based on the similarity theory, model of holder and the real holder each power parameter similarity relation, and the retainer dynamic model test [6-7]. In 2009, Yao Shiwei, the ship stern bearing by using the similarity theory to deduce the relevant similarity criteria, and the establishment of [8] test bench simulation of ship tail shaft bearing and lubrication. Research of early scholars are similar problems bearing dynamics completely based on geometric similarity, but in practical application, the bearing is mostly standard parts, it is difficult to satisfy the geometric similarity. In this paper, a rolling ball bearing rotor system and its scale model as the object of study, the similarity theorem based on the dimensional analysis and dynamic rolling ball bearing, a scaled model and prototype system of similarity relation, and numerical verification

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