共查询到18条相似文献,搜索用时 78 毫秒
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简要介绍了国内外低温工程领域在低温透平机械中应用动压气体轴承的现状。分析表明,箔片式动压气体轴承是一种理想的支承元件。介绍了该轴承的起源,结构形式及该轴承在低温工程领域的实用实例,分析并评价对该轴承进行的各种理论及试验研究。最后,指出了在我国低温工程领域开展箔片式动压气体轴承透平膨胀机研究的必要性。 相似文献
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介绍了三种低温透平膨胀机气体动压止推轴承(螺旋槽止推轴承、可倾瓦止推轴承,阶梯止推轴承)静动态特性的试验研究结果,讨论了各种运转参数和结构参数对轴承性能的影响,给出了优化参数的取值范围. 相似文献
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透平膨胀机气体轴承多功能实验台 总被引:1,自引:0,他引:1
在一个气体轴承常温动特性实验台的基础上,改建成了一个常温低温、静动特性气体轴承实验台,以满足开发气体轴承透平膨胀机的需要。实际应用显示,通过应用该实验台可有效地掌握透平膨胀机气体轴承的多方面性能。 相似文献
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At the previous works for tilting journal pad bearings (TPJBs), most TPJBs are designed to operate with the load either directly on-pad(LOP) or directly between-pad(LBP). However, in practice, in some cases, the load direction can change dramatically in operation. With the current requirements for the analysis of dynamic characteristics of the rotor-bearing systems, the effects of the load direction on the bearing performance must be known. So, in this paper, the effects of load direction on the static and dynamic characteristics of TPJBs are obtained with theoretical analysis based on the hydrodynamic lubrication theory, and the influence of load direction on the performance of TPJBs in different structure and operating parameters is also analysed. The results show that the load direction has considerable effects on the static and dynamic characteristics of the TPJBs, especially for the TPJBs that are operating under heavy load and high rotor speed. And for the operating condition that load direction changed rapidly, TPJBs with more pads, smaller length to diameter ratio, larger clearance ratio and smaller perload ratio can reduce the performance fluctuation with the variation of load direction. 相似文献
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Abstract A numerical method is used to compute the characteristics of an externally pressurized journal bearing. Results indicate that the squeeze term due to the oil pocket has very small effect on the bearing characteristics. At lower rotational speeds, double‐row hydrostatic journal bearings have higher damping coefficients than the single‐row bearings and, therefore, have a better stability. However, the stiffness coefficient and the loading capacity are lowered when using double‐row bearings. 相似文献
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识别油膜轴承动态参数的递推阻尼最小二乘法 总被引:1,自引:0,他引:1
应用有限元法建立了转子系统的状态空间模型,利用测得有限个振动数据,通过求解转子系统的状态方程,获得油膜轴承动态特性参数方程。分析了问题的可解条件,提出了递推阻尼最小二乘法。这种识别方法设备简单、收敛性好,可以实现在线识别。最后给出了实际转子系统的识别结果。 相似文献
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分析了球磨机采用滑动轴承存在摩擦阻力大的弊端。采用滚动轴承代替滑动轴承降低了磨机能耗,解决了大负荷下的轴承寿命、轴承密封等问题,磨机配用电动机功率可减少17%~23%。 相似文献
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桥梁新型减震橡胶支座减震耗能性能研究 总被引:1,自引:0,他引:1
本文简要介绍了作者最近研制的新型减震橡胶支座及其滞回阻尼性能。用作者发展的桥梁空间非线性地震反应分析程序(NSRAP)对装有橡胶支座多跨连续梁桥进行了纵桥向非线性地震反应分析。研究结果表明,桥梁新型减震支座具有较好的减震耗能性能,且性能稳定,因而该支座是一种较理想的实用减震支座。 相似文献
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