STUDY ON PATTERN FORMATION PHENOMENA IN MECHANICAL ENGINEERING

机械工程中模式形成现象的研究

基本信息

批准号：
08455115
负责人：
SUEOKA Atsuo
金额：
$ 5.31万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455115/
关键词：
Vibration of Rotating Body Stability Modeling Contact Vibration Rotatory Machine Systems with Time Lag Wear Visco-Elastic Body 自動車タイヤ

项目摘要

1.In order to make clear the generation mechanism of the polygonal wear which is one of the abnormal wears of automobile tire, the modeling and the analysis were performed, and a very good agreement between the experimental and the theoretical results were confirmed. The results obtained are summarized as follows :(1) The generation mechanism of the pattern formation phenomenon caused by the first natural vibration mode of tire itself in the vertical direction was made clear by modeling a system with time lag in which the wear quantity of the generated in the rolling contact surface is fed back to the contact surface after one rotation of tire as a forced displacement for the vibration in the vertical direction.(2) Almost regular polygonal pattern is formed on the tire tread in the circumferential direction when the polygonal wear is generated. The generation regions are in some limited ones satisfying the relation of (natural frequency of tire) * (polygonal number of tire) * (rotation … More al frequency of tire).(3) The difference in modeling of wear quantity of tire and wear resistance give almost no effect upon the width of generation regions of polygonal wear. However, it gives a significant influence upon the generation rate (the degree of instability) of the polygonal wear.2.The pettern formation of a work piece in centerless grinding machines was dynamically analyzed, and the experimental and the theoretical results were compared. The pattern formation means the polygonal deformation of the work piece. The surface of the work piece is deformed into a certain convex polygon during the grinding process, and these work pieces become consequently useless. The modeling of the system was described, regarding this phenomenon as an unstable vibration in grinding due to the time lag. As the results, it was made clear that (1) the unstable vibration tends to occur at nearly the natural frequencies of the grinder system and of the work piece itself, (2) the locations of the unstable regions in which mainy the work piece vibrates, vary periodically among even and odd polygonal numbers, and (3) the effect of the center height angle upon the polygonal deformation agrees well with the results of actual machines.3.The unstable vibration generated in multiple stage super calender including rolls covering rubber in the paper making machine was analyzed, taking the viscoelastic characteristics of rubber into account. The experimental results of the polygonal deformation of the roll-covering rubber due to the natural mode of order 10 agreed well with the analytical results.4.The flash over phenomenon of DC motor was researched, and the analytical model was constructes. The experimental and the analytical results will be compared. Less

1.为了明确汽车轮胎异常磨损之一的多边形磨损的产生机理，进行了建模和分析，实验结果与理论结果吻合良好。总结如下：(1)通过对具有时滞的系统进行建模，明确了轮胎本身垂直方向第一固有振动模态引起的花纹形成现象的产生机制，其中轮胎在滚动过程中产生的磨损量接触面反馈到接触面轮胎旋转一圈后，作为垂直方向振动的强制位移。(2)当产生多边形磨损时，在轮胎胎面上沿圆周方向形成几乎规则的多边形花纹。产生区域在满足的有限区域中。 (轮胎固有频率)*(轮胎多边形数)*(轮胎旋转频率)的关系。 (3)轮胎磨损量和耐磨性建模的差异对轮胎宽度几乎没有影响区域的生成然而，它对多边形磨损的发生率（不稳定程度）影响很大。2.对无心磨床工件的花纹形成进行了动态分析，并对实验结果和理论结果进行了分析。相比而言，图案形成意味着工件的表面在磨削过程中变形为某种凸多边形，并且这些工件因此变得无用。由于时间滞后而导致磨削过程中出现不稳定振动的现象，结果表明：(1) 不稳定振动倾向于在磨床系统和工件本身的固有频率附近发生，(2)工件主要振动的不稳定区域的位置，在偶数和奇数多边形之间周期性变化，并且（3）中心高角对多边形变形的影响与实际机器的结果非常吻合。多次产生不稳定振动对造纸机中包胶辊级超级压光机进行了分析，考虑了橡胶的粘弹性特性，10阶自然模态导致的包胶橡胶多边形变形的实验结果与分析结果吻合较好。 4.对直流电机的闪络现象进行了研究，并建立了解析模型，将实验结果与解析结果进行了比较。