Effect of Surface Waviness on the Performances of an Aerostatic Thrust Bearing with Orifice-Type Restrictor

Zhuang, Hui; Ding, Jialuo; Chen, Peng; Chang, Yu; Zeng, Xierong; Yang, Huanxing; Liu, Xingbao; Wei, Wei

doi:10.1007/s12541-021-00567-1

Cited by 11 publications

(11 citation statements)

References 50 publications

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“…The findings indicate that surface waviness has a significant impact on bearing capabilities, and that this impact increases with wave amplitude. The findings are in agreement with as reported by Zhuang et al 22 which shows that with an increase in wave amplitude, there is an increase in bearing load capacity and Dimofte, 11,12 which reported maximum performance of bearing with three waves.…”

Section: Full Surface Waviness (0-360 )supporting

confidence: 93%

“…In the case of surface waviness on the journal or bearing or both, gap geometry near the attitude angle due to waviness on the journal and bearing bush surface greatly affects the pressure generated and the bearing performance. Zhuang et al 22 reported that surface waviness has a significant impact on bearing capabilities and that this impact increases with wave amplitude. According to Sahu and Sharma, 23 the minimum fluid film thickness, lubricant flow, and fluid film damping coefficients are all improved by the three‐dimensional irregularities on the bearing surface.…”

Section: Introductionmentioning

confidence: 99%

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Impact of partial surface waviness on the tribological performance of hydrodynamic journal bearing

Bangotra

Sharma

2022

Lubrication Science

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In this paper, the static performance analysis of journal bearing having full and partial surface waviness has been presented. The surface waviness is to be considered in the full, first half, second half, and pressure-increasing and decreasing regions of the bearing for analysis. The effect of surface waviness is considered by modifying the lubricant flow governing Reynolds equation with the film thickness equation and it is solved with the finite element method to get performance parameters like bearing load capacity, friction coefficient, and so forth operating under eccentricity ratios range of 0.2-0.8. The waviness geometrical parameters like waviness numbers and amplitudes are also considered in circumferential, axial, and both directions in the selected regions. The maximum performance has been found for waviness in the full and pressureincreasing region in the circumferential direction at a high eccentricity ratio.

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Section: Full Surface Waviness (0-360 )supporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Impact of partial surface waviness on the tribological performance of hydrodynamic journal bearing

Bangotra

Sharma

2022

Lubrication Science

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“…For waviness numbers more than 15, it was found that there is a decrease in LCC and the maximum reduction was found at higher wave amplitude. The trend of the data obtained is also in agreement with the results published by Zhuang et al 10 and Rasheed. 2 From Figure 6(b) it is observed at higher eccentricity ratios LCC increases as circumferential waviness number n increases up to n = 5 after this increase in n value makes LCC decreases.…”

Section: Effects Of Circumferential Waviness On Misaligned Journal Be...supporting

confidence: 92%

“…They concluded that surface waviness influences the bearing characteristic. Zhuang et al 10 reported that surface waviness has a significant impact on bearing capabilities and that this impact increases with wave amplitude. It was discovered that irregularities increase the value of minimum fluid film thickness and lubricant flow.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of journal bearing having surface waviness operating under misaligned condition

Bangotra,

Sharma,

Taufique

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this present study, the effect of surface waviness on the performance of journal bearing operating in misaligned conditions has been investigated. The journal’s misaligned conditions in the present analysis are taken about the circumferential, the axial, and both axes. For computing the pressure of lubricant inside the bearing, the finite element method has been applied to solve the Reynolds equation and thus static parameters are obtained. The static parameters, that is, load carrying capacity and coefficient of friction are evaluated at different waviness variables and are compared with misaligned journal bearing without surface waviness. It is observed that misalignment considered in both axes has the most severe effect on static performance parameters as compared to misalignment only in the circumferential or axial axis. With the increase in circumferential waviness number up to n = 5, the load-carrying capacity increases, and the coefficient of friction decreases under high eccentricity ratios. Change in waviness amplitude also impacts the bearing performance. Axial waviness always deteriorates the bearing performance. Combined waviness increases the load carrying capacity and decreases the coefficient of friction when circumferential waviness number n = 5 and axial waviness number m = 2. The highest performance enhancement ratio is attained at an eccentricity ratio of 0.8 with a circumferential waviness number n of 5, axial waviness number m of 2, and dimensionless waviness amplitude [Formula: see text] of 0.075.

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“…Các nghiên cứu về hiệu suất ổ khí tĩnh cũng đã được nghiên cứu với những ảnh hưởng khác nhau đã được đưa ra để cải thiện độ cứng vững khi làm việc [8,9]. Một số tác giả cũng đã phân tích độ chính xác của ổ khí tĩnh xét đến độ tròn và hình trụ của trục và ảnh hưởng của độ sóng bề mặt đến hiệu suất của ổ trục lực đẩy khí tĩnh đối với lỗ cấp khí [10][11][12][13] độ gợn bề mặt cũng làm ảnh hưởng đến hiệu suất trục chính khi quay [14]. Abdurrahim Dal cũng đã nghiên cứu về động lực học của ổ trục không khí được điều áp bên ngoài với các giá trị khe hở cao.…”

Section: Giới Thiệuunclassified

Nghiên cứu ảnh hưởng của tải trọng tới cân bằng trục trong ổ khí tĩnh

2022

jsthaui

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Trục chính sử dụng đệm khí có những ưu điểm như ma sát gần như không có, ít sinh nhiệt, tuổi bền cao. Tuy nhiên, vấn đề bôi trơn khí cũng có những nhược điểm tồn tại đó là không ổn định bằng các ổ tương tự bôi trơn bằng chất lỏng; các ổ khí thường chịu tải nhỏ,..., điều đó hạn chế phạm vi sử dụng của ổ khí. Ngoài ra, việc nghiên cứu tính toán ổ khí cũng đang trong quá trình nghiên cứu và thực nghiệm, cũng có những khó khăn nhất định. Khó khăn lớn nhất vẫn là vấn đề khắc phục những dạng mất ổn định do hiện tượng chuyển động vị xoáy của chất khí trong ổ biểu hiện ở xoáy bán vận tốc, xoáy đồng bộ... Trong bài báo này đưa ra phương án cân bằng trục ổ khí tĩnh bằng mô phỏng số và thực nghiệm khả năng tải đến độ cứng vững của ổ khí tĩnh.Từ khóa: Ổ khí quay, cân bằng, rung động đệm khí, tải trọng, cân bằng trục, áp suất khí.

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Effect of Surface Waviness on the Performances of an Aerostatic Thrust Bearing with Orifice-Type Restrictor

Cited by 11 publications

References 50 publications

Impact of partial surface waviness on the tribological performance of hydrodynamic journal bearing

Impact of partial surface waviness on the tribological performance of hydrodynamic journal bearing

Performance analysis of journal bearing having surface waviness operating under misaligned condition

Nghiên cứu ảnh hưởng của tải trọng tới cân bằng trục trong ổ khí tĩnh

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