Experimental Study on the Dynamic Performance of Water‐Lubricated Rubber Bearings with Local Contact

Ouyang, Wu; Zhang, Xuebing; Jin, Yong; Yuan, Xiao

doi:10.1155/2018/6309727

Cited by 29 publications

(15 citation statements)

References 22 publications

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“…Widely used in heavy rotating machinery, fluid-film bearings can form a pressurized fluid film through a hydrodynamic or hydrostatic effect [33][34][35]. The journal will be separated from the bearing bore by the fluid film, and the mechanical contacting will be transferred into a solid-liquid mode.…”

Section: Fluid-film Bearingsmentioning

confidence: 99%

An Overview of Bearing Candidates for the Next Generation of Reusable Liquid Rocket Turbopumps

Miao

et al. 2020

Chin. J. Mech. Eng.

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There is a consensus in the aerospace field that the development of reusable liquid rockets can effectively reduce the launch expense. The pursuit of a long service life and reutilization highly depends on the bearing components. However, the rolling element bearings (REBs) used in the existing rocket turbopumps present obvious and increasing limitations due to their mechanical contacting mode. For REBs, high rotational speed and long service life are two performance indexes that mutually restrict each other. To go beyond the DN value (the product of the bearing bore and rotational speed) limit of REBs, the major space powers have conducted substantial explorations on the use of new types of bearings to replace the REB. This review discusses, first, the crucial role of bearings in rocket turbopumps and the related structural improvements of REBs. Then, with the prospect of application to the next generation of reusable liquid rocket turbopumps, the bearing candidates investigated by major space powers are summarized comprehensively. These promising alternatives to REBs include fluid-film, foil, and magnetic bearings, together with the novel superconducting compound bearings recently proposed by our team. Our more than ten years of relevant research on fluid-film and magnetic bearings are also introduced. This review is meaningful for the development of long-life and highly reliable bearings to be used in future reusable rocket turbopumps.

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Section: Fluid-film Bearingsmentioning

confidence: 99%

An Overview of Bearing Candidates for the Next Generation of Reusable Liquid Rocket Turbopumps

Miao

et al. 2020

Chin. J. Mech. Eng.

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“…1,2 Delprete and Razavykia 3 pointed out that the dynamics and slap of the piston skirt have a great influence on engine performance. Ouyang et al 4 studied the dynamic service characteristics of water-lubricated rubber bearings through experiments and found that the working conditions have a great influence on the contact stiffness and damping, which can affect the dynamic performance of bearing. Therefore, it is necessary to consider the dynamic behaviour when studying the tribology behaviour of mechanical transmission components.…”

Section: Introductionmentioning

confidence: 99%

A tribo‐dynamic model for point contacts under lubrication

Pei

Wang

et al. 2021

Lubrication Science

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This study proposes a tribo-dynamic model for point contacts under lubrication, focusing on the excitations caused by surface movement, defect and load impact. Surface movement and load impact can cause changes in contact force, resulting in acceleration and dynamic displacement, which may affect the flow of the lubricant. The traditional lubrication model is usually steady or transient, and load balance is used to correct the normal height, ignoring a series of influences such as the mass, stiffness and damping. It requires repeated corrections to obtain a balanced position, which is very time-consuming. By combining tribology and dynamics, dynamic excitation is introduced in the contact process in this study. After determining the initial value, the normal height can be directly obtained from the dynamic equation. Besides, a comparison between the tribo-dynamic model and the steady-state model is presented. It is found that the film thickness and pressure distribution calculated by the two models are almost the same at medium and low speeds, while the calculation results of the two models are different at high speed or under load impact, which emphasises the importance of considering the dynamic behaviour in the study of contacts.

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“…Wang et al 28 used the additional unbalance excitation method to identify the dynamic coefficients of highspeed water-lubricated hybrid bearings. Wu et al 29 established a test rig and proposed an identification method for water-lubricated rubber bearings, which utilizes rotor unbalanced motion to produce selfexcited force rather than artificial excitation. Wang et al 30 investigated a system identification method for rotating machinery stability evaluation based on sine sweep excitation testing method using electromagnetic actuator.…”

Section: Introductionmentioning

confidence: 99%

Identification method of dynamic characteristics coefficients of tilting pad bearing in critical speed range of large unit

Chen

Wang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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For tilting pad bearing of large unit, it is not easy to identify stiffness and damping coefficients in full-size unit test. Because of many limiting factors in large unit test, the stiffness and damping test methods are not fully applicable to large units, which can be easily implemented in laboratory. The nonexcitation methods are proposed in this paper to identify the stiffness and damping coefficients of tilting pad bearing in the critical speed range of large unit, including direct method and iterative method. Firstly, the rotor speed and vibration during the whole period are obtained. The vibration data of the first-order critical speed range in the startup stage are selected, and the stiffness and damping coefficients of tilting pad bearing are identified through the two methods. The results show that the stiffness and damping coefficients identified through the direct method are generally less than the theoretical values. The identification error of stiffness coefficient is within ±9%, and the identification accuracy of stiffness coefficient is significantly higher than that of damping coefficient. The damping coefficient identified by the iterative method agrees well with the theoretical value, and the identification error is about −3%. In conclusion, the stiffness and damping coefficients of tilting pad bearing in the range of first-order critical speed can be obtained by combining the two identification methods. These identification results are relatively reliable and can basically meet the analysis requirements of important vibration problems of bearing-rotor system.

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Experimental Study on the Dynamic Performance of Water‐Lubricated Rubber Bearings with Local Contact

Cited by 29 publications

References 22 publications

An Overview of Bearing Candidates for the Next Generation of Reusable Liquid Rocket Turbopumps

An Overview of Bearing Candidates for the Next Generation of Reusable Liquid Rocket Turbopumps

A tribo‐dynamic model for point contacts under lubrication

Identification method of dynamic characteristics coefficients of tilting pad bearing in critical speed range of large unit

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