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以存在滚子偏斜工况的圆柱滚子轴承为研究对象,基于轴承拟静力学模型与有限长线接触弹流润滑模型建立圆柱滚子轴承弹流润滑理论计算模型,并基于力学特性分析工况参数对圆柱滚子轴承滚子与滚道接触区域润滑性能的影响,结果表明:力矩载荷作用后,油膜压力与油膜厚度呈非对称分布;力矩载荷越大,油膜压力和油膜厚度的偏斜程度越明显,易导致轴承润滑性能恶化;径向载荷和内圈转速越大,油膜压力偏斜程度越小。 相似文献
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试验研究表明,油膜润滑参数λ≥3时,形成全面弹性流体动力润滑;λ≥1.5时,能获得高的轴承疲劳寿命。 λ值的计算,涉及到轴承的内部结构、加工精度及应用设计的若干参数。文中推导出圆锥滚子轴承的结构参数和润滑参数的计算公式,并给出了圆锥滚子轴承油膜润滑参数计算用诺模图。通过实例计算和诺模图的精确估计,分析了国内外重点轴承厂家圆锥滚子轴承结构的润滑性能和轴承的润滑状态。附图4幅,表1个,参考文献9篇。 相似文献
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为探究冲击载荷对滚滑轴承润滑性能的影响,设计一种轮子扁疤系统,以模拟轴承受到的循环冲击载荷,利用数值分析法对比研究冲击载荷作用下滚滑轴承的润滑特性及不同工况对滚滑轴承滚子润滑的影响。结果表明:滚滑轴承的滚子润滑受冲击载荷的影响小于滚动轴承;冲击载荷发生前,滚滑轴承滚子油膜有高于油膜中心压力的第二峰值压力,油膜出口区有明显缩颈现象,随冲击载荷的增大,第二峰值压力虽会逐渐减小,但不会消失;冲击载荷频率越大,最小油膜厚度越大,冲击载荷幅值越大,滚子油膜厚度越薄;滚子油膜厚度随润滑油黏度、转速的增加而增加。 相似文献
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舰船尾轴承变形对其阻尼特性的影响研究 总被引:1,自引:0,他引:1
舰船推进轴系受多个载荷的作用,导致船体、螺旋桨轴和尾轴承发生变形,并在尾轴承中心线与螺旋桨轴颈中心线之间形成一个变形角。研究了变形夹角对轴承油膜动态阻尼参数的影响关系,用数值计算的方法计算得到了轴承油膜阻尼参数与变形角之间的变化关系。结果表明:轴承中线与轴颈轴线之间的变形夹角对轴承润滑阻尼参数的影响关系为强的非线性关系;变形角对轴承阻尼特性影响较大,随着变形角的增大,油膜阻尼Dxx和Dyy会增大,而阻尼Dyz和Dxy会减小;轴颈中线与轴承中线之间夹角对油膜阻尼参数的影响局限在一定的弯曲变形范围内,当变形继续增大时,螺旋桨轴与尾轴承发生刚性接触,此时轴与轴承的刚性接触摩擦作用增大,阻尼作用急剧改变。 相似文献
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根据流体润滑理论,本文建立了滚子轴承挡边-滚子端面润滑,并编制了有限元计算程序,文中详细分析了端面形状,偏斜角,挡边支托角,间隙等因素对油膜压力的影响。并对滚子偏斜稳定性以及轴向窜动问题作了初步探讨。 相似文献
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以风电机组用大型双列调心滚子轴承为研究对象,基于Romax软件分析外部载荷作用下轴承内部载荷、应力及油膜厚度的分布情况。研究结果表明:轴承受载后,两列滚道各有将近一半的滚子承受载荷,但是两列承载滚子数量和承载滚子的位置角范围不同,两列滚道受到的载荷和应力不同,出现了偏载现象;滚子与滚道之间的接触面积为椭圆,椭圆的短轴部分沿滚子母线方向,椭圆的长轴部分沿滚子滚动的方向;球面滚子两端无应力集中现象;油膜分布规律与应力分布基本一致,最小油膜厚度出现在应力最大位置处。该研究结果可为轴承结构参数优化提供参考。 相似文献
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为了揭示表面粗糙度对圆柱滚子轴承线接触稳态弹流润滑性能的影响,本文建立了具有表面粗糙度的圆柱滚子轴承弹流润滑模型,并推导出了摩擦系数方程;采用有限差分法求解了圆柱滚子轴承的弹流润滑性能,并分析了余弦粗糙度幅值、波长和纹理角度对圆柱滚子轴承弹流润滑性能的影响.数值结果表明:随着粗糙度幅值的增大,油膜厚度和油膜压力在粗糙度波峰波谷处的波动增大;随着粗糙度波长的增大,油膜厚度逐渐减小,油膜压力的波动逐渐减小;横向粗糙度更有利于提高承载能力,降低摩擦系数.因此,在合理的范围内增加粗糙度的幅度和波长,采用交叉纹理,有利于提高圆柱滚子轴承的弹流润滑性能. 相似文献
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圆柱滚子轴承弹流接触副刚度及阻尼系数研究 总被引:1,自引:0,他引:1
针对圆柱滚子轴承中滚子-滚道弹流接触副,建立有限长线接触非稳态弹流润滑模型,利用追赶法、快速傅里叶变换和Newmark技术数值求解接触副在自由振动下的衰减曲线。以刚体接近距离的变化作为判断接触副振动的标准,结合弹流润滑模型和有阻尼系统的自由振动模型,给出预测滚子-滚道弹流接触副动力学参数的方法,考察初始扰动量、润滑剂黏压系数、滚子长度和载荷对刚度和阻尼系数的影响。结果表明:小扰动下,初始扰动量大小对刚度和阻尼系数的影响可忽略不计;弹流润滑下的刚度小于干接触下的Hertz接触刚度;增加润滑剂黏压系数、滚子长径比和载荷,均可增大弹流接触副的刚度系数;阻尼系数随润滑剂黏压系数的增加而减小,随滚子长径比的增加而增加,随一定范围内载荷的增加而减小。 相似文献
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A Jeffcott rotor system on cylindrical roller bearings is studied in detail. Its critical speed is calculated by a new calculation
method with roller bearing stiffness and damping. The influences of bearing parameters, such as the roller length, rotor mass,
distance between the bearings and the kinematics viscosity of lubrication on the system critical speed are numerically studied,
and the influences of an oil film and damping on the critical speed are also studied. Regular curves of the relationship between
the geometric parameters and the system critical speed are obtained. The results show that with increasing roller length and
radial load, the critical speed increases; and with increasing rotor mass and the distance between the bearings and the kinematics
viscosity, the critical speed decreases. This means that an oil film will decrease the critical rotational speed of the rotor
system. 相似文献
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This article describes the measurement of lubricant film thickness distribution in a roller bearing by using two juxtaposed transducers, which are excited by a new ultrasonic pulse receiver with a maximum pulse repetition rate (PRR) of 100 kHz. The experimental results demonstrate the feasibility and advantage of this method with high PRRs. The influence of rotating speed and radial load on the measured film thickness are shown to be consistent with the theoretical predictions. Skewing of the roller in the bearing is observed. A combined trigger signal is proposed to reduce the influence of the cyclical vibration of the rotor. 相似文献
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齿轮传动中的润滑油膜一般为非线性粘滞体(Ree-Eying体)。运用部分膜承载热弹流理论计算齿轮传动中的滑动摩擦力和滚动摩擦力。齿轮的振动阻尼力是齿面滑动摩擦力中的一部分,是齿轮振动角位移的非线性函数。为了便于工程应用,使用线性阻尼系数。它是齿轮几何尺寸和压力油膜的粘度及膜厚的函数。 相似文献
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《Mechanical Systems and Signal Processing》2014,42(1-2):335-350
This paper experimentally investigates the formation of a lubricant film in a deep groove ball bearing and its effect on the bearing dynamics. A novel test rig is introduced, which allows testing different types and sizes of bearings in real-life conditions. The test rig dynamics are optimised such that the dynamic properties of the bearing are measured in a frequency range below the resonances of the flexible modes. Two properties of the bearing, both its stiffness and damping value in the direction of the static bearing load, are identified. The behaviour of the lubricant film between the rolling elements and raceways is measured based on the electrical resistance through the bearing. For this purpose, the bearing housing is electrically isolated from the surrounding structure. The electrical resistance, stiffness and damping of the test bearing are identified during a speed run-up. The influence of the bearing temperature is analysed as well. During a run-up at constant bearing temperature, the measurement of the electrical resistance describes the formation of the lubricant film. Due to the formation of the lubricant film, the bearing stiffness increases by 3.2% while the damping increases by 24%. During a warm-up of the bearing, the viscosity of the lubricant film decreases strongly. A resulting decrease in electrical resistance, stiffness and damping is measured. Finally, the electrical resistance, stiffness and damping are identified at different speeds, after the bearing has reached a stable temperature at each speed. A combined effect of both rotation and temperature is observed and discussed. 相似文献
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J. Dominy 《Tribology International》1981,14(3):139-145
High speed lightly loaded cylindrical roller bearings are prone to slip and lubricant starvation at the inner race - roller contacts. Both factors affect the oil film thickness which, in turn, influence the bearing life. Existing oil film thickness - life factors do no adequately consider these parameters It can be shown that the most important single factor is the cage speed; almost any variables that modify the conditions in the bearing do so by adjusting the speed of the cage itself. Curves are presented illustrating the influence of the bearing and chamber design and lubricant properties on the starved oil film thickness at the bearing inner contacts. It is shown that these values can be used to obtain improved life estimates 相似文献