考虑滑移流影响的新型弹性支承微型箔片动压气浮轴承的性能分析
发布时间:2018-02-04 00:51
本文关键词: 微型空气箔片轴承 有限差分法 滑移流 静动态特性 出处:《机械工程学报》2017年17期 论文类型:期刊论文
【摘要】:针对新型弹性支承微型箔片动压轴承的弹性结构,提出了刚度预测模型,并搭载静态刚度测试试验台,验证了计算模型的正确性。通过耦合弹性结构刚度模型和考虑一阶滑移流的雷诺方程,研究了在滑移流影响下的轴承的静、动态特性。发现在定转速下,随着载荷的增加,滑移流对于轴承的偏心率和最小气膜厚度的影响逐渐增大;随着转速的增加轴承刚度逐渐增加,阻尼则逐渐减小;在滑移流影响下轴承刚度减小,阻尼增加。弹性支承结构的厚度和单元个数对于静动态结果影响明显。
[Abstract]:In view of the elastic structure of a new type of elastic support micro foil dynamic bearing, a stiffness prediction model is proposed, and a static stiffness test rig is built. The validity of the calculation model is verified. The static and dynamic characteristics of bearing under the influence of slip flow are studied by coupling the stiffness model of elastic structure and the Reynolds equation considering the first order slip flow. With the increase of load, the influence of slip flow on the eccentricity ratio and the minimum film thickness of bearing increases gradually. With the increase of rotational speed, the stiffness of bearing increases gradually, and the damping decreases gradually. Under the influence of slip flow, the bearing stiffness decreases and the damping increases, and the thickness and the number of elements of the elastic support structure have obvious influence on the static and dynamic results.
【作者单位】: 湖南大学汽车车身先进设计制造国家重点实验室;同济大学汽车学院;同济大学新能源汽车工程中心;
【基金】:国家自然科学基金(51575170) 国家科技部科技支撑计划(2015BAG06B01)资助项目
【分类号】:TH133.3
【正文快照】: 0前言*近年来随着微型飞行器的推进系统、燃料电池的空气补给管理系统、各类机器人的涡轮发电机等微型涡轮机械和微动力机电系统的发展,作为这些设备核心技术的高速轴承得到了越来越多的关注[1]。由于设备尺寸和功率都较小,所以需要用于支承转子的轴承具有超高转速、低损耗的,
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