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Design and manufacturing of modular self-compensating hydrostatic journal bearings

机译:模块化自补偿静压轴颈轴承的设计和制造

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摘要

In order to carry a load, a multi recess hydrostatic bearing supplied with a single pressure source requires compensation devices. These devices are also known as restricters and they allow the recess pressures to differ from each other. These devices, when properly selected and tuned, can deliver excellent bearing performance. However, these devices add to the complexity of the bearing and they are sensitive to manufacturing errors. These devices must often be tuned specifically for each bearing and are therefore expensive to install and maintain. Self-regulating or self-compensating bearings do not need any external devices to achieve load-carrying capability and they do not add to the total degrees of freedom of the system. However, in many cases the proposed designs require multiple precision manufacturing steps such as EDM and grinding in addition to precision shrink fit. In this work a self-compensating design, which eliminates all but one precision-manufacturing step, was manufactured and tested. Novel manufacturing methods for different sizes were introduced. The test results were compared with theoretical results and satisfactory agreement was achieved. The bearing sensitivity to manufacturing errors was analyzed computationally using statistical methods. These results were used to show that the introduced manufacturing methods are more cost effective than the applicable precision or semi precision manufacturing methods even when the performance variation is taken into account. When hydrostatic journal bearing is rotated hydrodynamic effects are introduced. Often, these effects are ignored by assuming them to be insignificant. Two non-dimensional parameters were derived to estimate the significance of the hydrodynamic effects and limits to these parameters were searched numerically. Design theory, along with first order equations to estimate bearing performance was developed.
机译:为了承受负荷,配备有单个压力源的多凹槽静压轴承需要补偿装置。这些装置也称为限流器,它们使凹入压力互不相同。如果正确选择和调整这些设备,它们可以提供出色的轴承性能。然而,这些装置增加了轴承的复杂性,并且它们对制造误差敏感。这些设备通常必须针对每个轴承进行专门调整,因此安装和维护成本很高。自调节或自补偿轴承不需要任何外部设备即可达到承载能力,并且不会增加系统的总自由度。但是,在许多情况下,除了精确的热缩配合,建议的设计还需要多个精密的制造步骤,例如EDM和磨削。在这项工作中,制造并测试了一种自补偿设计,该设计消除了除一个精密制造步骤外的所有步骤。介绍了针对不同尺寸的新颖制造方法。将测试结果与理论结果进行了比较,取得了令人满意的一致性。使用统计方法对轴承对制造误差的敏感性进行了计算分析。这些结果用于表明,即使考虑到性能变化,引入的制造方法也比适用的精密或半精密制造方法更具成本效益。当静压轴颈轴承旋转时,就会引入流体动力作用。通常,通过假定它们是无关紧要的而忽略了这些影响。推导了两个无量纲参数来估计水动力效应的重要性,并通过数值搜索了这些参数的极限。开发了设计理论以及估计轴承性能的一阶方程。

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