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3 edition of A high-speed photography study of cavitation in a dynamically loaded journal bearing found in the catalog.

A high-speed photography study of cavitation in a dynamically loaded journal bearing

A high-speed photography study of cavitation in a dynamically loaded journal bearing

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  • 31 Currently reading

Published by NASA, US Army Aviation Systems Command, Aviation R&T Activity, For sale by the National Technical Information Service in [Washington, D.C.], Cleveland, Ohio, [Springfield, Va .
Written in

    Subjects:
  • Cavitation.,
  • Journal bearings.,
  • Cavitation flow.,
  • Fluid films.,
  • High speed photography.,
  • Lubricants.

  • Edition Notes

    Other titlesHigh speed photography study of cavitation in a dynamically loaded journal bearing.
    StatementD.C. Sun and D.E. Brewe ; prepared for the Joint Tribology Conference, cosponsored by the ASME and STLE, Toronto, Canada, October 7-10, 1990.
    SeriesNASA technical memorandum -- 103178., AVSCOM technical report -- 90-C-013., AVSCOM technical report -- 90-C-13.
    ContributionsBrewe, David E., United States. National Aeronautics and Space Administration., United States. Army Aviation Research and Technology Activity.
    The Physical Object
    FormatMicroform
    Pagination25 p.
    Number of Pages25
    ID Numbers
    Open LibraryOL18087038M


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A high-speed photography study of cavitation in a dynamically loaded journal bearing Download PDF EPUB FB2

A HIGH-SPEED PHOTOGRAPHY STUDY OF CAVITATION IN A DYNAMICA14LY LOADED JOURNAL BEARING D.C. Sun* Department of Mechanical and Industrial Engineering Thomas J. Watson School of Engineering, Applied Science, and Technology State University of New York at Binghamton Binghamton, New York and D.E.

Brewe Propulsion Directorate. A High Speed Photography Study of Cavitation in a Dynamically Loaded Journal Bearing D. Sun Department of Mechanical and Industrial Engineering, Thomas J.

Watson School of Engineering, Applied Science, and Technology, State University of New Cited by: A high speed photography study of cavitation in a dynamically loaded journal bearing.

By D. Sun and D. Brewe. Abstract. The earlier study made by Jacobson and Hamrock on the cavitation of liquid lubricant films in a dynamically loaded journal bearing was repeated with a quartz sleeve, which was more rigid than the Polymethylmethacrylate Author: D. Sun and D. Brewe. This is a commentary to: A High Speed Photography Study of Cavitation in a Dynamically Loaded Journal Bearing This is a commentary to: Shape Sensitivities and Optimal Configurations for Heat Diffusion Problems: a BEM ApproachAuthor: J.

Walton. A commentary has been published: Closure to “Discussions of ‘A High Speed Photography Study of Cavitation in a Dynamically Loaded Journal Bearing’” (, ASME J. Tribol.,pp. –) This is a commentary to: Shape Sensitivities and Optimal Configurations for Heat Diffusion Problems: a Author: B.

Jacobson. Under high and super-high speed conditions, oil film of the journal bearing is easy to crack and then becomes cavitation.

The existence of cavitation has a great effect on the work characteristics of the bearing. Cavitation boundary of a three-groove journal beaing was investigated on the journal bearing experimental : Ying Yang, Li Xu, Wen Qing Liu.

Closure to “Discussions of ‘A High Speed Photography Study of Cavitation in a Dynamically Loaded Journal Bearing’” (, ASME J. Tribol.,pp. –) D. Sun, D. SunCited by: 1. Cavitation of the oil film in a dynamically loaded journal bearing was studied using high-speed photography and pressure measurement simultaneously.

Comparison of A high-speed photography study of cavitation in a dynamically loaded journal bearing book visual and pressure data provided considerable insight into the occurence and non-occurrence of by: A numerical investigation of cavitation in dynamically loaded journal bearings using mobility method is presented.

The numerical procedure incorporates an algorithm of cavitation based on the work of Elrod. Film rupture and reformation are predicted considering mass flow conservation through the entire by: The main objective of this programme is to carry out a scale model study on the behaviour of a cavitation bubble during its collapse phase as effected by various types of surfaces.

The cavitation test rig consists of a decompressed chamber which utilizes Author: Wee King Soh. A High Speed Photography Study of Cavitation in a Dynamically Loaded Journal Bearing. Journal of Tribology, Trans ASME, Vol. (), pp DOI: /Author: Ying Yang, Jing Hua Dai, Xu Li.

D.C. Sun, D.E. A high-speed photography study of cavitation in a dynamically loaded journal bearing book, P.B. AbelSimultaneous pressure measurement and high-speed photography study of cavitation in a dynamically loaded journal bearing J Cited by: 7. Cavitation of the oil film in a dynamically loaded journal bearing was studied using high-speed photography and pressure measurement simultaneously.

Comparison of the visual and pressure data provided considerable insight into the occurence and non-occurrence of A high-speed photography study of cavitation in a dynamically loaded journal bearing book D.

Sun, D. Brewe and P. Abel. D.C. Sun, D.E. Brewe, P.B. Abel, Simultaneous pressure measurement and high-speed photography study of cavitation in a dynamically loaded journal bearing.

Get this from a library. A high-speed photography study of cavitation in a dynamically loaded journal bearing. [D C Sun; David E Brewe; United States. National Aeronautics and Space Administration.; United States.

Army Aviation Research and Technology Activity.]. Cavitation of the oil film in a dynamically loaded journal bearing was studied using high-speed photography and pressure measurement simultaneously.

Comparison of the visual and pressure data provided considerable insight into the occurrence and non-occurrence of by:   This phenomenon, characteristic of loaded bearings, is known as cavitation or gaseous cavitation. Schematic of a journal bearing.

In some cases involving high-frequency varying loads, as in internal combustion engines, the pressure might drop below the oil vapor pressure (which is lower than the ambient pressure). Simultaneous Pressure Measurement and High Speed Photography Study of Cavitation in a Dynamically Loaded Journal Bearing.

Chen Ying Sun Meili Fang Chaofeng Wang Xiangang(School of Mechanical and Electrical Engineering,Shanghai University, Shanghai ,China). The cavitation phenomenon in journal bearing and journal whirl are considered to evaluate the static and dynamic characteristics of journal bearing, to be more consistent with the actual operating conditions of journal bearing.

With a 3D CFD method, the cavitation and journal whirl are simulated by adopting mesh deformation technique and mixture phase-change by: 4. The transient behavior of cavitation phenomenon in textured thrust bearings with oil lubricant was experimentally investigated.

During experiments, the cavitation phenomenon in different surface textures was observed directly with a high-speed camera. It is shown that cavitation shape and area change according to texture patterns.

The bubbles within cavitation zones increase with running Cited by: 4. Get this from a library. Simultaneous pressure measurement and high-speed photography study of cavitation in a dynamically loaded journal bearing.

[D C Sun; David E Brewe; Phillip Benjamin Abel; United States. National Aeronautics and Space Administration.]. A velocity-slip model is developed for analysis of cavitation in a journal bearing.

• High slip coefficient (K s =1) forms in cavitation region of journal bearing. • Slip effect increases load capacity and decrease crical mass at lower rotating speed. • Slip effect has no effect on performace of journal bearing with increase of rotating Cited by: The earlier study made by Jacobson and Hamrock on the cavitation of liquid lubricant films in a dynamically loaded journal bearing was repeated with a quartz sleeve, which was more rigid than the.

In the experimental study, Brewe [ 1 ] used the high speed camera to study the dynamic cavitation characteristics of the bearing oil film.

It pointed out that the smaller the bearing clearance, the higher the journal rotation speed and the greater the eccentricity, the more likely the : Lili Wang, Zengkai Liu, Guoteng Yuan, Yuliang Wei. It agreesd well with the prediction. Conclusions Through the above-mentioned experimental study of a steady existing pattern of collapse and rebound (disintegration and aggregation) of cavitation bubbles near rigid boundary in acoustic field with high-speed photography, some Cited by: Cavitation of the oil film in a dynamically loaded journal bearing was studied using high-speed photog-raphy and pressure measurement simultaneously.

Comparison of the visual and pressure data provided consider-able insight into the occurrence and nonoccurrence of cavitation. It was found that (1) for the submerged journal. film dynamic characteristics presents a study of the fluid inertia ef-fect on the stability of a finite journal bearing operating with a low viscosity lubricant under high speed.

A linear perturbation tech-nique was used to evaluate dynamic characteristics of the journal bearing in two dimensions. A non-Newtonian lubricant was used. The effect of cavitation and the determination of the cavitation boundaries are important to obtain a realistic model of a journal bearing.

A numerical investigation of cavitation in dynamically-loaded journal bearings using the mobility method is presented. The numerical procedure incorporates an algorithm of cavitation based on the work of by: 2.

the intermediate and high values of viscosity used in this study. INTRODUCTION Earlier work by Jacobson and Hamrock (Refs. I and 2) using high-speed photography revealed the existence of vapor cavitation in dynamically loaded journal bearings. A polymethylmethacrylate (PMMA) housing was used for visualization of the cavitation.

appearance of vapor cavitation in a dynamically loaded journal bearing for the first time by using high-speed photography. More recently, Walton et al.

have used high-speed photography to observe cavitation in squeeze-film dampers. ("Experimental Observation of Cavitating Squeeze Fi lm. The analytical results demonstrate that for statically loaded journal bearings, the algorithm possesses higher computational accuracy and faster solution speed than other domain type procedures.

An objective of the current work is to utilize the boundary element cavitation algorithm to analyze cavitation in dynamically loaded journal bearings. SPIE Digital Library Proceedings. 7 June Application Of High-Speed Photography For Study Of Cavitation In Sediment-Laden Water FlowAuthor: Zhang Fuqi, Hu Chuanjin.

Journal Bearing with Cavitation. Application ID: A journal bearing is composed of an outer cylinder (bearing) wrapped around an inner rotating journal (shaft), with a lubricant separating the two.

Under certain operating conditions, cavitation can occur between the bearing and the journal, leading to component damage and failure.

– bearing load, Ψ – relative bearing clearanceΨ = (D-D. j)/D, B – bearing length, D – bearing diameter, D. j - journal diameter, η – dynamic viscosity of oil, ω – angular speed of journal.

Raimondi-Boyd analysis is based on the assumption that the oil viscosity does not change when it passes through the Size: KB. A journal bearing is composed of an outer cylinder (bearing) wrapped around an inner rotating journal (shaft), with a lubricant separating the two.

Under certain operating conditions, cavitation can occur between the bearing and the journal, leading to component damage and failure. Sun's 10 research works with 97 citations and reads, including: Study of Hybrid Lubrication at the Tooth Contact of a Wormgear Transmission: Part 1—Formulation and Analysis.

The dynamic coefficients of the bearing such as stiffness and damping with cavitation model considered are quite different from that without cavitation. So it is worth to pay attention to and do further study about the cavitation in the sliding bearing in the high speed rotor by: 6.

for steadily loaded and also dynamically loaded journal bearings, i.e. in a connecting rod big end bearing the inertia force acting on th e jour nal is carri ed by the crankshaft bearing.

In the. This work studies the effect of lubricant inertia on the fluid cavitation for partially sealed high-speed squeeze film dampers (SFDs) executing small amplitude circular-centered orbits (CCOs). The lubricant cavitation is modeled by both the Elrod algorithm and the Gumbel’s cavitation boundary condition to provide the comparison between the most common lubricant cavitation by: 1.

This book is intended as a combination of a reference book for those who work with cavitation or bubble dynamics and as a monograph for advanced students interested in some of the basic problems associated with this category of multi-phase flows.

A book like this has many roots. It. Cavitation is a phenomenon in which rapid pdf of pdf in a liquid lead to the formation of small vapor-filled cavities in places where the pressure is relatively low. When subjected to higher pressure, these cavities, called "bubbles" or "voids", collapse and can generate shock wave that is strong very close to the bubble, but rapidly weakens as it propagates away from the bubble.evidence has been relied upon to treat cavitation in dynamically loaded journal bearings in a similar manner to that in steadily loaded journal bearings.

Figure 5 shows a photograph that identifies such a regime in a squeeze film damper bearing when operated at a .