共查询到20条相似文献,搜索用时 62 毫秒
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根据对转子最大振幅和轴承最大动压力的计算,并着重分析了支承分析了支承硬度和非线性指数对滚动轴承非线性振动的影响,同时,还研究了滚动轴承支承的特性,由此得出采用弹性支承能消除滚动承非线性振动的结论。 相似文献
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考虑圆柱滚子轴承非线性接触力、保持架能量、鼠笼刚度、转子不平衡以及它们之间的力学耦合关系,基于拉格朗日方程建立鼠笼式弹性支承-圆柱滚子轴承-单转子系统动力学分析模型,结合龙格库塔数值积分方法,并对该模型动力学仿真分析,分析了不同转速区域鼠笼式弹性支承-滚动轴承-转子系统振动响应的分岔特性,结果表明:两支点的鼠笼式弹性支... 相似文献
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滚动轴承非线性振动特性探讨 总被引:1,自引:0,他引:1
主要研究了滚动轴承支承转子系统的非线性振动及相关的轴承破坏问题。采用滚动轴承的非线性刚度表达式,建立了滚动轴承支承刚性转子系统的力学模型和数学模型;通过对数学模型的求解,得出了系统振动的反应曲线和骨干曲线;揭示了滚动轴承的非线性振动是其高速运转时破坏的原因之一,并从理论上解释了球轴承和滚子轴承的动力特性差异。附图4幅,参考文献3篇。 相似文献
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滚动轴承振动统计特性分析 总被引:11,自引:7,他引:11
利用微机数据采集和分析系统,以数字信号处理技术,全面地研究了滚动轴承振动的统计特性。正常轴承的振动加速度信号是服从正态分布的零均值随机信号,信号的均方根值能正确地描述轴承振动的烈度,鉴别产品的质量水平,它和幅值分布的峭度系数可用于轴承的工况监测和故障诊断。 相似文献
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分析滚动轴承系统的寿命与可靠性之间的关系,对滚动轴承系统进行了可靠度的分配;对影响滚动轴承额定寿命的各因素进行讨论,并对滚动轴承额定寿命进行修正。 相似文献
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This work aims to characterize vibration behavior of roller bearings as a function of lubricant viscosity. Experimental tests were performed in NU205 roller bearings, lubricated with mineral oil of three different viscosity grades (ISO 10, 32 and 68). The mechanical vibration was determined through the processing and analysis of bearing radial vibration data, obtained from each of the lubrication conditions, during 2 h of test run for temperature stabilization and under several bearing shaft speeds. The applied radial load was 10% of the bearing nominal load. Through root mean square (RMS) analysis of the vibration signals, it was possible to identify specific frequency bands modulated by the change in lubricant viscosity, which was related to change in oil film thickness. 相似文献
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滚动轴承是机械中最常用到的标准零件之一,常用来承受转轴上的负荷,也是易损元件之一.文章从安装、使用、维护等方面提出了如何正确使用和维护滚动轴承. 相似文献
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Backward and forward defect frequencies of rolling element bearings are experimentally investigated utilizing the two-sided
directional spectra of the complex-valued vibration signals measured from the outer ring of defective bearings. The experimental
results show that the directional zoom spectrum is superior to the conventional spectrum in identification of bearing defect
frequencies, in particular the inner race defect frequencies. 相似文献
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Dynamic loading of a rolling element bearing structure is modeled by a computer program developed in Visual Basic programming language. The vibration response of the structure to the dynamic loading is obtained using a standard finite element package I-DEAS. A force model is proposed to model the localized rolling element bearing defects. Time and frequency domain analyses are performed for diagnostics of rolling element bearing structures. Statistical properties of the vibration signals for healthy and defected structures are compared. The envelope (HFRT) method is employed in the frequency domain analysis. The effect of the rotational speed on the diagnostics of rolling element bearing defects is investigated. An optimum sensor location on the structure is sought. Effect of the structure geometry on the monitoring techniques is studied. An optimum monitoring method can be employed by analyzing the rolling element bearing structure following the procedure proposed in this study. The present commercial computer aided engineering packages can be used in special engineering applications such as condition monitoring of rolling element bearings. 相似文献
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A method of simultaneous optimal design of flexible mechanisms and control with multiple frequency constraints based on the independent modal space control theory is proposed. Firstly, the performance index for simultaneous mechanism and control design is discussed. Secondly, an integrated optimal design algorithm is developed on the basis of Kuhn–Tucker optimality criteria, in which three damping factors are introduced to guarantee the algorithm that possesses good stability and convergence. Finally, numerical simulations are carried out on a path generating mechanism. Simulation results show that the performance of the control input is improved significantly after integrated optimization. 相似文献
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Yabin Dong Mingfu LiaoXiaolong Zhang Fazhan Wang 《Mechanical Systems and Signal Processing》2011,25(4):1276-1286
In order to effectively smooth noise and extract the impulse components in the vibration signals of defective rolling element bearings, a new modified morphology analytical method has been proposed. In this method, average of the closing and opening operator has been used as the morphology operator. Being the flat and zero adopted as the shape and the height of structure element (SE), respectively, the optimized length of SE is defined by a new proposed criterion (called SNR criterion). The effect of the new method is validated by both simulated impulsive signal and vibration signal of three defective rolling bearings with an outer, an inner and a rolling element faults and compared with Nikolaou’s method. The result shows that the proposed method has the superior performance in extracting impulsive characteristics of vibration signals, especially for the high level noise signals, and can implement better in diagnosis of defective rolling element bearing. 相似文献
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Yanxue Wang Ming Liang 《Mechanical Systems and Signal Processing》2011,25(5):1750-1764
In this paper, we propose an adaptive spectral kurtosis (SK) technique for the fault detection of rolling element bearings. The primary contribution is adaptive determination of the bandwidth and center frequency. This is implemented with successive attempts to right-expand a given window along the frequency axis by merging it with its subsequent neighboring windows. Influence of the parameters such as the initial window function, bandwidth and window overlap on the merged windows as well as how to choose those parameters in practical applications are explored. Based on simulated experiments, it can be found that the proposed technique can further enhance the SK-based method as compared to the kurtogram approach. The effectiveness of the proposed method in fault detection of the rolling element bearings is validated using experimental signals. 相似文献