Performance of hydrostatic tilted thrust pad bearings of various recess shapes operating with non-Newtonian lubricant

Yadav, Saurabh; Sharma, Satish C.

doi:10.1016/j.finel.2014.04.009

Cited by 40 publications

(17 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The pressure is considered to be linear over an element and expressed as 20,22 where N j is the element shape function and n e is the number of nodes per element of two dimensional flow–field discretized solution domains. By applying Galarkin’s FEM approach, the global system of equation in algebraic form is expressed as 20,22,23 where[F¯] = assembled fluidity matrix{P¯} = nodal pressure vector{Q¯} = nodal flow vector{R¯H} = column vectors due to hydrodynamic termsR¯Zj = global right hand side vectors due to journal center linear velocities l 1 and l 2 are the direction cosines and i , j = 1, 2,… n e .…”

Section: Introductionmentioning

confidence: 99%

Influence of dimple location and depth on the performance characteristics of the hydrodynamic journal bearing system

Singh

Awasthi²

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

This paper concerns with theoretical investigation to predict the influence of cylindrical textures on the static and dynamic performance characteristics of hydrodynamic journal bearing system and the performance is compared with smooth surface bearing. The Reynolds equation governing the fluid–film between the journal and the bearing surface is solved numerically with the assistance of finite element method and the performance characteristics are evaluated as a function of eccentricity ratio, dimple depth and its location. In this study, four journal bearing configurations viz: smooth (non-textured), full-textured, partially textured-I, and partially textured-II are considered for the evaluation of theoretical results. The simulated results indicate that the influence of surface textures is more significant when the textures were created in upstream zone of 126°–286° and dimple aspect ratio nearly 1.0.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of dimple location and depth on the performance characteristics of the hydrodynamic journal bearing system

Singh

Awasthi²

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

show abstract

“…The finite element discretization of the air flow field is shown in Figure 2. The gas pressure variation over an element is computed as 21–23 where N j is the nodal shape function and nl e is the number of nodes in a quadrilateral element. Here, the value of nl e is four.…”

Section: Finite Element Formulationmentioning

confidence: 99%

A direct numerical approach to compute the nonlinear rotordynamic coefficient of the noncircular gas journal bearing

Yadav

Rajput

Ram

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

Gas bearings are extensively used in several industrial applications to support the rotating load at high speed due to its favorable characteristics. The numerical computation of the gas film damping and stiffness coefficients is a difficult task due to nonlinearity in the Reynolds equation for compressible lubricant. In the present work, a numerical method based on the finite element method is developed for the direct computation of gas film damping and stiffness coefficients. In this method, a double partial differential equation approach has been used to compute the dynamic characteristics. Further, the numerical results presented shows that the bearing ellipticity ratio significantly affects the nonlinear trajectory of the journal.

show abstract

“…Untuk menjelaskan karakteristik pelumas dalam daerah kavitasi, metode Elrod [4] telah digunakan. Yadav dan Sharma [5] Berdasarkan penelusuran pustaka seperti yang telah dijelaskan, dapat diambil kesimpulan bahwa penelitian karakteristik bearing dengan pelumas non Newtonian yang mempertimbangkan model kavitasi masih sangat sedikit. Bermula dari pemahaman bahwa model kavitasi memiliki dampak yang sangat besar terhadap hasil analisis bearing, maka metode numerik berbasis model CFD (computational fluid dynamic) akan dikembangkan.…”

Section: Pendahuluanunclassified

Studi Performansi Textured Bearing Dengan Pelumas Non-Newtonian Dengan Mempertimbangkan Slip Dan Kavitasi

Tauviqirrahman

Muthik

Risky

2016

Rot.

View full text Add to dashboard Cite

ABSTRAKSaat ini, dalam dunia medis telah dikembangkan berbagai peralatan biomekanik yang dibuat untuk memperbaiki kualitas kesehatan manusia. Dalam peralatan tersebut, bearing merupakan salah satu elemen-elemen mesin yang memiliki fungsi vital. Hal ini dikarenakan bearing berfungsi membatasi gerak relatif antara dua atau lebih komponen mesin agar selalu bergerak pada arah yang diinginkan. Dengan menjaga fungsi pelumasan pada bearing, maka putaran bisa berlangsung secara halus dan aman, sehingga diharapkan pada akhirnya nanti peralatan kesehatan tersebut dapat mempunyai umur pakai yang lebih panjang. Penelitian-penelitian tentang pelumasan pada bearing saat ini banyak mengasumsikan pelumas bersifat Newtonian. Dalam kenyataannya, pelumas pada bearing di tingkat lapangan memiliki karakteristik non-Newtonian. Oleh karena itu, dalam penelitian kali ini, bearing dengan pelumas non Newtonian akan dianalisa lebih lanjut dengan menggunakan CFD (computational fluid dynamic). Permukaan kontak pada bearing akan dimodifikasi dengan tekstur dan slip untuk meningkatkan performansi pelumasan. Kedalaman tekstur divariasikan sebesar 0.1 dan 0.75 kali ketebalan film pelumas. Daya dukung beban dan gesekan menjadi dua parameter utama performansi pelumasan yang akan dianalisa. Dalam tulisan ini, perbandingan hasil antara analisa yang mempertimbangkan model kavitasi dengan yang tidak, menjadi pokok kajian. Hasil simulasi menunjukkan bahwa terdapat perbedaan hasil numerik antara yang mempertimbangkan kavitasi dan yang tidak sampai dengan 20 %. Selain itu, dengan memberikan slip pada tekstur dapat meningkatkan performansi daya dukung beban sebesar 300 % dengan menjaga gesekan tetap kecil. Hasil penelitian kali ini dapat dijadikan sebagai langkah awal untuk memperbaiki kualitas performansi textured bearing yang berpelumas non Newtonian.Kata kunci: CFD (computational fluid dynamic), kavitasi, non Newtonian, pelumasan, slip, tesktur

show abstract

Performance of hydrostatic tilted thrust pad bearings of various recess shapes operating with non-Newtonian lubricant

Cited by 40 publications

References 38 publications

Influence of dimple location and depth on the performance characteristics of the hydrodynamic journal bearing system

Influence of dimple location and depth on the performance characteristics of the hydrodynamic journal bearing system

A direct numerical approach to compute the nonlinear rotordynamic coefficient of the noncircular gas journal bearing

Studi Performansi Textured Bearing Dengan Pelumas Non-Newtonian Dengan Mempertimbangkan Slip Dan Kavitasi

Contact Info

Product

Resources

About