A review of hydrostatic bearing system: Researches and applications

Liu, Zhifeng; Wang, Yumo; Cai, Ligang; Zhao, Yongsheng; Cheng, Qiang; Dong, Xin

doi:10.1177/1687814017730536

Cited by 55 publications

(25 citation statements)

References 132 publications

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“…Hence, it could be truly considered as the General Characteristic Bearing Equation, it controls the bearing parameters and never act the bearing outside its domination. Equating the ratio (m) with unity makes the restrictor parameter (m) disappear yielding equation (10). Now, this equation does not point to or contain a restrictor, which theoretically means that it expresses a restrictor-less bearing.…”

Section: General Characteristic Equationmentioning

confidence: 99%

“…The physical meaning of disappearing (m) is that the inlet bearing orifice does not only act as a flow passage but also as an orifice restrictor. The previous studies handling the subject of designing untraditional bearings depend on the bearing outlet passage to act as a restrictor where the bearings are called as self compensation [5][6][7][8][9][10].…”

Section: General Characteristic Equationmentioning

confidence: 99%

“…Zhifeng Li et al [10] offered a fruitful review of hydrostatic bearing system where the articles about hydrostatic bearings since 1990 were collected in this review. Researching status was evaluated in two aspects: basic theory and typical application.…”

Section: Introductionmentioning

confidence: 99%

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Design of Self-restriction Hydrostatic Thrust Spherical Bearing (Fitted Type)

Elescandarany¹

2019

IJMEA

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This is the last part of the series studying the fitted hydrostatic thrust spherical bearing. It handles an unconventional design of this type of bearings. The conception of this design is to break the rules controlling the bearing restrictions, where it is believed that without restrictors no hydrostatic bearing could be got (axiom). The paper focused the effort to derive a general characteristic equation that can control the design in turn the bearing performance and behavior. This general characteristic equation, through its simple form, gives the designer the ability to get a comprehensive conception about his problem and widely opens the door in front of him to design a conventional or unconventional bearing whatever the bearing purpose. The effective parameters; needed to be known for designing the bearing; were concentrated into three items; the rotor speed, the seat dimensions and the lubricant properties. The characteristic equation shows that the seat radius and the inlet angle play the major role in determining the supply pressure, in turn the load carrying capacity. The inertia, the recess angle and the lubricant viscosity have the major effect on determining the bearing stiffness in case of the partial hemispherical seats while in case of the hemispherical seats the stiffness has slightly been affected. The design shows that the bearings with hemispherical seats have extremely low stiffness, practically zero stiffness and very high temperature rise, which make this bearing configuration invalid to be self restriction bearing; while the bearings with partial hemispherical seats have a very wide stiffness range allowing the designer to control and design the bearing with the stiffness needed for any purpose (from zero stiffness to extremely high stiffness). The lubricant temperature rises about three degrees centigrade which practically means that the bearing operates at constant temperature.

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Section: General Characteristic Equationmentioning

confidence: 99%

Section: General Characteristic Equationmentioning

confidence: 99%

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Design of Self-restriction Hydrostatic Thrust Spherical Bearing (Fitted Type)

Elescandarany¹

2019

IJMEA

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“…Z Liu et al 2 proposed a general Reynolds equation for rectangle oil pad of hydrostatic ram in a manufacturing model. The variation of oil viscosity and temperature can be ignored between slowly moving surfaces according to researches of M El Khlifi, 3 Liu et al, 4 and Wang et al 5 In the study of Q Yang et al, 6 Wang et al, 7 and Masjedi and Khonsari, 8 non-Newtonian feature of oil can be neglect when maximum pressure is lower than 3 MPa. R Nicoletti, 9 Liu et al, 10 and Wang et al 11 used numerical method to solve the Reynolds equation efficiently in their analyses.…”

Section: Introductionmentioning

confidence: 99%

Analysis and optimization of nonlinear carrying performance of hydrostatic ram based on finite difference method and Runge–Kutta method

Wang

Liu

Cheng

et al. 2019

Advances in Mechanical Engineering

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Analyzing of nonlinear carrying performance of hydrostatic ram is among key research questions to improve heavy machine tools because the machining precision will be directly influenced by it. A dynamic model of nonlinear supporting characters for hydrostatic ram is developed in this work. Modified Reynolds equation is resolved by finite difference method numerically to determine the carrying capability. Dynamic equilibrium equation of hydrostatic ram under cutting force impact is solved by Runge-Kutta method to obtain the variation of tool tip position and evaluate the machining accuracy. An optimal oil supply rate allocation and oil pad size is proposed to improve the static and dynamic performance simultaneously based on method of bisection.

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“…A similar analysis has been developed in [10] but here a gas lubricated bearing was considered. In [11] the authors expand their review to different geometries of hydrostatic bearing; focusing on the journal bearing, they stated that the majority of the works from research is dedicated on the study of bearing modelling and dynamic characteristic rather than optimization. If, from one side, it is obvious that the mechanism of bearing a radial load for a hydrostatic journal bearing lays on the ability of the rod to reach an eccentric position, from the other side the influence of the manufacturing tolerances may play a role in influencing this eccentricity.…”

Section: Introductionmentioning

confidence: 99%

Modelling of hydrostatic bearings for servo-cylinders

Zardin¹,

Natali²,

Cillo³

et al. 2019

Second International Conference on Material Science, Smart Structures and Applications: Icmss-2019

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Hydraulic servo cylinders are widely used in versatile industrial applications such as machine tools, industrial robots, autonomous manufacturing systems and special applications in laboratories. To reduce friction and allow smooth and controllable displacement of the actuator, hydrostatic journal bearings are used at the ends of the rod. The design and manufacturing of this elements is challenging since the good operation relays on the very small tolerances required to bear the load on the cylinder and to reduce leakages. In this work, a virtual design and test tool for hydrostatic journal bearing with pockets, developed in OpenModelica environment, is presented. The influence of eccentricity and manufacturing tolerances is then studied and discussed. The model proposed has the aim to explore the extreme and critical operating conditions of the servo-cylinder and to help and/or improve the design phase.

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A review of hydrostatic bearing system: Researches and applications

Cited by 55 publications

References 132 publications

Design of Self-restriction Hydrostatic Thrust Spherical Bearing (Fitted Type)

Design of Self-restriction Hydrostatic Thrust Spherical Bearing (Fitted Type)

Analysis and optimization of nonlinear carrying performance of hydrostatic ram based on finite difference method and Runge–Kutta method

Modelling of hydrostatic bearings for servo-cylinders

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