主动静压气体润滑支承的研究进展

主动静压气体润滑支承可提高其承载力、动刚度和抗扰动能力,成为近期流体润滑学术界的研究热点问题。综述真空预载、电磁预载和压电主动控制的静压气体润滑支承研究现状,分析压电主动控制的静压气体润滑支承的研究进展以及存在的问题,指出主动固有节流器、主动控制节流器或气膜形状可控节流器相结合的主动气体润滑支承,是静压气体润滑支承研究的重点和未来主要发展方向。     

高速多支承气体静压轴承电主轴的承载特性研究

基于单元气体静压轴承的承载性能，简化多支承气体静压电主轴的支承和主轴结构，建立了有限元分析模型，借助ANSYS软件分析轴系的各种结构方案，并进行承载特性分析对比。研究分析多支承结构的承载机理，总结出提高气体静压电主轴承载特性的措施。分析了不同主轴结构和轴承布置对电主轴承载特性的影响，优选出了的多支承静压轴承电主轴结构。     

一种用于液体静压支承的新型锥阀节流器的设计计算

本文首次提出一种用于液体静压支承的新型可变节流器——锥阀节流器。理论和试验表明:这种节流器加工容易,设计计算方便,性能优良、工作可靠、具有很好的推广应用前景。     

一种新型滑靴静压支承在水压马达中的应用研究

针对水压传动的新特点 ,研制了一种新的同心圆缝型滑靴静压支承。分析了这种静压支承的工作原理和基本特性 ,介绍了一个设计实例和台架试验。试验表明 ,采用静压平衡法设计的同心圆缝阻尼型静压支承结构滑靴比采用剩余压紧力法设计的滑靴底部的磨损量小 ,接触比压小。这说明同心圆缝型滑靴静压支承结构特别适合水压马达     

静压支承球铰副的支承特性研究

大量的研究表明，柱塞与滑靴之间的球铰副摩擦力很大程度上影响着轴向柱塞泵的性能及寿命。文章提出了一种基于静压支承的珠铰副的设计原理，并对该摩擦副的支承特性进行了研究。     

静压支承球铰副支承反力的求解

提出了一种基于静压支承原理的球铰副的设计方法,并对该摩擦副油膜支承反力进行了求解,为高速高压轴向柱塞泵的设计提供了一定的理论依据。     

液体静压支承中的新型控制元件—定量阀的研制

本文研制了一种结构简单、性能可靠的定量阀,该阀可以在液体静压支承中实现定量供油的效果,通过实验验证,该定量阀的定量效果满足生产实际的需要。     

一种气体静压球面轴承的参数优化方法

将遗传算法应用于设计气体静压球面轴承的主要参数，结合气浮式动平衡测量装置的要求，给出了算法实现的具体操作步骤和计算结果，开发了应用软件。实验结果表明提出的方法是可行且合理的。     

关于柱塞泵中滑靴静压支承适应性问题的探讨

在以前的闭式轴向柱塞泵中的柱塞与滑靴大部分采用静压支承设计法,而静压支承中必须有一个定阻尼,一个变阻尼,方能达到支承的目的,由于定阻尼的存在,就给支承在滑靴处有一个频率适应性问题,本文着重讨论此问题。     

高精度气体静压轴系刚度分析

文章从多孔质气体静压轴承刚度、主轴几何刚度结构设计原则等方面论述了高精度气体静压轴系刚度的分析方法，并进行了相应的实验。实验表明石墨高精度气体静压轴系不仅精度高而且刚度高。     

变粘度条件下静压支承滑靴副的研究

本文对变粘度条件下的静压支承滑靴副进行了一定的理论研究和分析，通过计算机仿真，得出了滑靴副泄漏流量和支承反力不仅与中心油室压力有关，而且还与流体的粘温系数、粘压系数、密度和比热容等有关的结论，为高速高压轴向柱塞泵的设计提供了一定的理论依据。     

An Experimental Investigation into the Temperature Profile of a Compliant Foil Air Bearing

A series of tests was performed to determine the internal temperature profile in a compliant bump-type foil journal air bearing operating at room temperature under various speed and load conditions. The temperature profile was collected by instrumenting a foil bearing with nine type-K thermocouples arranged in the center and along the bearing's edges in order to measure local temperatures and estimate thermal gradients in the axial and circumferential directions. To facilitate the measurement of maximum temperatures from viscous shearing in the air film, the thermocouples were tack-welded to the backside of the bumps that were in direct contact with the top foil. The mating journal was coated with a high-temperature solid lubricant that, together with the bearing, underwent high-temperature start-stop cycles to produce a smooth, steady-state run-in surface. Tests were conducted at speeds from 20 to 50 krpm and loads ranged from 9 to 222 N.

The results indicate that, over the conditions tested, both journal rotational speed and radial load are responsible for heat generation with speed playing a more significant role in the magnitude of the temperatures. The temperature distribution was nearly symmetric about the bearing center at 20 and 30 krpm but became slightly skewed toward one side at 40 and 50 krpm. Surprisingly, the maximum temperatures did not occur at the bearing edge, where the minimum film thickness is expected, but rather in the middle of the bearing, where analytical investigations have predicted the air film to be much thicker. Thermal gradients were common during testing and were strongest in the axial direction from the middle of the bearing to its edges, reaching 3.78° C/mm. The temperature profile indicated the circumferential thermal gradients were negligible.     

A Study on the Influence of Waviness Error to a Hydrostatic Bearing for a Crankshaft Pin Turner

This article describes a theoretical analysis of a hydrostatic journal bearing for a crankshaft pin turner by considering the waviness error of the journal and bearing. The authors found adequate design parameters to operate the crankshaft pin turner bearing. The flow rate, radial clearance, and eccentricity were selected as the basic design parameters. The load-carrying capacity of the bearing as a function of the design parameters was studied in the case of a true circular journal and bearing. The influence of the waviness error on the load-carrying capacity was then investigated; cosine functions were selected for the waviness functions. As a result, the load-carrying capacity varied according to the amplitude and phase angle of the waviness functions. Thus, it was found that the influence of the waviness error is a significant factor in analyzing lubrication characteristics.

Run-out accuracy analysis method according to the waviness phase angles of the journal and bearing was suggested. It was found that the phase angles between the bearing load wave and load-carrying capacity wave are important factors that affect the running accuracy in addition to the amplitude of waviness error.     

Air Bearing Spindle Motor for Hard Disk Drives

This article discusses the possibility of using air-bearing spindle motors to replace hydrodynamic-bearing spindle motors used in hard disk drives through comparing the advantages and disadvantages of air-bearing spindle motors with those of hydrodynamic-bearing spindle motors. Then the dynamic characteristics of the air-bearing system are analyzed and optimum parameters are proposed. The prototypes based on the obtained parameters are fabricated and tested. The test result is presented and compared with the numerical prediction; good agreement is observed.     

On the Steady Performance of Hydrostatic Thrust Bearing: Rabinowitsch Fluid Model

The present theoretical analysis is to investigate the effect of non-Newtonian pseudoplastic lubricant (lubricant blended with viscosity index improver and viscosity thickener)–Rabinowitsch fluid model on the performance of externally pressurized hydrostatic thrust bearing. The expression for pressure has been derived using an energy integral approach. The load capacity and frictional torque of the bearing have also been numerically calculated for various values of viscosity index improver along with the centrifugal effects. The results so obtained are compared and found to be in good agreement with the earlier theoretical and practical results of Dowson, and the effect of viscosity index improver is also analyzed.     

Stability of a New Type of Hydrostatic/Hydrodynamic Floating Ring Gas Bearing

In this paper, a new type of floating ring gas bearing in which a “floating ring” is combined with an “orifice-annular and shallow-pocket” gas bearing is introduced. The stability of this new type of floating ring gas journal bearing is theoretically analyzed by use of the modified 8-stiffness and damping coefficients method. The variation of the dimensionless critical mass of the rotor with a clearance ratio C₂/C₁, mass ratio m₂/m₁, given ring speed ratio ω₂/ω₁, supply pressure P_s, eccentricity ratio of inner film ε₁ and width ratio of the shallow-pocket (l/L)_u is presented. The variations of the dimensionless load capacity of this type of gas bearing with the above-mentioned parameters are also given.     

无周向回油液体静压轴承优化设计

介绍以总功耗最小为目标函数、主轴系统刚度为主要约束条件的无周向回油液体静压轴承优化设计方法,与普通设计方法相比,其总功耗可大幅度降低。     

静压轴承在伺服作动器中的应用

探讨设计一种适合伺服作动器工况的液体静压轴承结构及相关附件的结构形式,为静压轴承在伺服缸的实际应用提供一定参考。     

基于静压轴承原理的新型测力缸塞系统

提出一种基于静压轴承原理的新型测力缸塞系统。介绍该测力缸塞系统的工作原理和设计原理;对制造成功的该测力缸塞系统进行实验分析。实验结果表明,它不仅具有传统转缸系统的测力精度,而且在抗倾覆性和测力平稳性方面具有明显有优越性。