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101.
推力轴承各耦合动特性系数对转子横向振动状态的贡献 总被引:1,自引:0,他引:1
系统地研究了推力轴承各耦合动特性系数对转子横向振动状态的贡献。计算结果表明,推力轴承对转子横向振动状态的影响主要由推力盘摆动而产生的耦合动特性系数所决定,而由平动所产生的耦合动特性系数对转子振动状态影响的贡献很小,可以忽略。 相似文献
102.
Belkacem Manser Idir Belaidi Abderrachid Hamrani Sofiane Khelladi Farid Bakir 《Comptes Rendus Mecanique》2019,347(2):141-165
A wisely chosen geometry of micro textures with the favorable relative motion of lubricated surfaces in contacts can enhance tribological characteristics. In this paper, a computational investigation related to the combined influence of bearing surface texturing and journal misalignment on the performances of hydrodynamic journal bearings is reported. To this end, a numerical analysis is performed to test three texture shapes: square “SQ”, cylindrical “CY”, and triangular “TR”, and shaft misalignment variation in angle and degree. The Reynolds equation of a thin viscous film is solved using a finite differences scheme and a mass conservation algorithm (JFO boundary conditions), taking into account the presence of textures on both full film and cavitation regions. Preliminary results are compared with benchmark data and are consistent with a positive enhancement in misaligned bearing performances (load carrying capacity and friction). The results suggest that the micro-step bearing mechanism is a key parameter, where the micro-pressure recovery action present in dimples located at the second angular part of the bearing (from 180° to 360°) can compensate for the loss on performances caused by shaft misalignment, while the micro-pressure drop effect at the full film region causes poor performances. Considering the right arrangement of textures on the contact surface, their contours geometries can have a significant impact on the performance of misaligned journal bearings, particularly at high eccentricity ratios, high misalignment degrees and when the misalignment angle α approaches to or . 相似文献
103.
粗糙表面滑动轴承非牛顿介质润滑的计算 总被引:2,自引:1,他引:2
分析了轴承润滑中非牛顿介质的流变特性以及轴承表面形貌对润滑效果的影响,推导出了修正的雷诺方程,在方程中用差分粘度和第一正应力差函数表征非牛顿介质的流变特性,采用流量因子表征表面形貌的作用.结果表明:差分粘度的变化是影响润滑结果的主要因素,它取决于不同介质的动态参数和剪切频率范围,非牛顿介质润滑的承载力并非总高于或低于牛顿介质;在动载荷条件下,第一正应力差效应使油膜压力明显增大;影响流量因子的2个因素为表面形貌的粗糙度和纹理,但其作用远小于非牛顿介质流变特性的影响. 相似文献
104.
The results of an experimental investigation of the hydraulic resistance of a circular pipe for turbulent flow with periodic flow rate fluctuations are presented. The presence of resonance phenomena in the pipe is revealed. It is established that, for hydrodynamic nonstationarity, the pipe resistance is a nonmonotonous function of the frequency of the imposed flow rate fluctuations and differs from the pipe resistance in the stationary flow regime. Under the conditions considered, to find the pipe resistance it is necessary to take into account the variation of the flow kinetic energy with respect to the phase of the imposed flow rate fluctuations due to the deformation of the velocity profile. 相似文献
105.
加注稀土元素铒改善轴承表面性能的研究 总被引:2,自引:0,他引:2
在Mo^++N^+注入模式的基础上,应用电子能谱、卢瑟福背散射谱、扫描电子显微镜和MHK-500型摩擦磨损试验机等研究了加注稀土元素铒正离子Er^+对轴承表面摩擦学性能和耐蚀性能的影响。结果表明,在合理配置Mo^+、N^+、Er^+之能量和剂量的情况下,加注Er^+既能更好地改善轴承的表面性能,又能使重离子的强韧化效果提高2-4倍以上,表明MO^++N^++Er^+注入模式是一种具有良好应用前景的 相似文献
106.
针对滚动轴承滚珠磨损故障特征难以提取的问题,提出一种基于多脉冲激励法下的Volterra级数核的求解算法.该方法是一种非线性系统模型的“交叉”诊断法,利用轴承系统输入输出的采样信号,建立Volterra非线性辨识系统模型,并运用多脉冲激励Volterra低阶核求解算法,将得到的低阶核通过时域和频域进行对比来判断轴承当前所处的运行状态.该文以无心车床主轴轴承为例进行实验验证,并与传统的小波分析法对比得出:多脉冲激励法能够方便准确地提取轴承的故障特征,该方法对此类故障的诊断具有一定的借鉴意义. 相似文献
107.
108.
V. I. Grabovskii 《Fluid Dynamics》2004,39(4):540-550
The optimum design of the cylindrical outer contours of a gas journal bearing is obtained using the methods of the calculus of variations with allowance for the lubricant leakage through the bearing ends and the feeder slot when the lubricant mass in the working gap is conserved. The variational problem of designing the clearance shape giving the maximum bearing load capacity is formulated and solved. A modified Elrod-Burgdorfer condition for the pressure is used. 相似文献
109.
E. V. Ermanyuk N. V. Gavrilov 《Journal of Applied Mechanics and Technical Physics》2005,46(6):800-806
The hydrodynamic loads due to the interaction of a small-amplitude internal solitary wave with a submerged circular cylinder
in a two-layer system of miscible fluids were studied experimentally. The dependence of the internal-wave transmission coefficient
on the position of the center of the cylinder relative to the pycnocline and on the ratio of the cylinder diameter to the
fluid-layer thickness was obtained. The effects of the pycnocline thickness and the depth of the center of the cylinder on
the value of the hydrodynamic loads were studied. Visualization of the flow structure was performed.
__________
Translated from Prikladnaya Mekhanika i Tekhnicheskaya Fizika, Vol. 46, No. 6, pp. 36–44, November–December, 2005. 相似文献
110.
The physical mechanisms of development of hydrodynamic instability during high-velocity impact are analyzed analytically and using numerical simulation. A new mechanism of development of instability based on the assumption of the existence of initial perturbations on the surfaces of the colliding plates is proposed. The progressive displacement of the maximum of the specific surface mixed mass from the shortwave to the longwave spectrum range and the self-similarity of the variation of the interface are established. 相似文献