Report 27: Some Rigs for Investigating the Properties of Self-Lubricated Bearing Materials with Reciprocating and Oscillating Motion

1967 ◽  
Vol 182 (7) ◽  
pp. 132-134
Author(s):  
P. F. Sheppard ◽  
W. J. J. Crump
Keyword(s):  
Field Experience ◽  
Special Test ◽  
Continuous Rotation ◽  
Wide Range ◽  
Wear And Friction ◽  
Bearing Materials ◽  
Oscillating Motion

Self-lubricated bearing materials find many of their applications in bearings with peculiar motions which will not support a hydrodynamic film. With motions other than continuous rotation or continuous sliding very little information is available. To provide these data for the designer and to investigate the suitability of these materials for specific duties several special test rigs have been developed. This report describes some of the rigs developed for this work and the relevance of the results to field experience. The rigs are capable of subjecting the test bearings to a wide range of speeds and load with reciprocating, oscillating and semi-rotary motions in atmospheres of controlled humidity. Results are usually based on attained life, but both wear and friction are measured.

Field Experience of an Innovative Downhole Energy Harvesting System

2021 ◽  
Author(s):  
Muhammad Arsalan ◽  
Jarl André Fellinghaug
Keyword(s):  
Energy Harvesting ◽  
Field Experience ◽  
Production Systems ◽  
Conventional Technique ◽  
Future Production ◽  
Wide Range ◽  
Energy Harvesting System ◽  
Self Powered ◽  
Reliable Solution ◽  
Storage Technologies

Abstract Downhole power harvesting is an enabling technology for a wide range of future production systems and applications, including self-powered downhole monitoring, downhole robotics, and wireless intelligent completions. This paper presents the field experience of an innovative energy harvesting system that was successfully deployed and tested in the harsh downhole conditions of an oil producer. There is a critical need for robust and reliable downhole power generation and storage technologies to push the boundaries of downhole sensing and control. This paper provides an analysis of available ambient energy sources in the downhole environment, and various energy harvesting techniques that can be employed to provide a reliable solution. Advantages and limitations of conventional technique like turbine are compared to advanced energy harvesting technologies. The power requirements and technical challenges related to different downhole applications have also been addressed. The field experience of the novel flow-based energy harvesting system are presented, including the details of both the lab and field prototype design, deployment and testing.

scholarly journals Development of a shutterless continuous rotation method using an X-ray CMOS detector for protein crystallography

2009 ◽  
Vol 42 (6) ◽  
pp. 1165-1175 ◽  
Author(s):  
Kazuya Hasegawa ◽  
Kunio Hirata ◽  
Tetsuya Shimizu ◽  
Nobutaka Shimizu ◽  
Takaaki Hikima ◽  
...  
Keyword(s):  
Data Collection ◽  
Dynamic Range ◽  
Protein Structures ◽  
Protein Crystallography ◽  
New Method ◽  
Oxide Semiconductor ◽  
X Ray ◽  
Rotation Method ◽  
Continuous Rotation ◽  
Wide Range

A new shutterless continuous rotation method using an X-ray complementary metal-oxide semiconductor (CMOS) detector has been developed for high-speed, precise data collection in protein crystallography. The principle of operation and the basic performance of the X-ray CMOS detector (Hamamatsu Photonics KK C10158DK) have been shown to be appropriate to the shutterless continuous rotation method. The data quality of the continuous rotation method is comparable to that of the conventional oscillation method using a CCD detector and, furthermore, the combination with fine φ slicing improves the data accuracy without increasing the data-collection time. The new method is more sensitive to diffraction intensity because of the narrow dynamic range of the CMOS detector. However, the strong diffraction spots were found to be precisely measured by recording them on successive multiple images by selecting an adequate rotation step. The new method has been used to successfully determine three protein structures by multi- and single-wavelength anomalous diffraction phasing and has thereby been proved applicable in protein crystallography. The apparatus and method may become a powerful tool at synchrotron protein crystallography beamlines with important potential across a wide range of X-ray wavelengths.

Wear and Friction of Nitrogen Ion Implanted Steel

1983 ◽  
Vol 105 (2) ◽  
pp. 239-244 ◽  
Author(s):  
J. A. Kirk ◽  
G. W. Egerton ◽  
B. D. Sartwell
Keyword(s):  
Stainless Steel ◽  
Ion Implantation ◽  
Wear Behavior ◽  
304 Stainless Steel ◽  
Nitrogen Ion Implantation ◽  
Wide Range ◽  
Wear And Friction ◽  
Nitrogen Ion ◽  
Contact Pressures ◽  
Ion Implanted

A pin on disk wear test apparatus was used to evaluate wear and friction properties for nitrogen ion implanted and non-ion implanted steel disks in the presence of a lubricant. Both AISI/1018 mild steel and 304 stainless steel were examined. Typical fluence levels for ion implantation were above 1017 ions/cm2. In this paper disk wear is measured directly by a Talysurf profilometer tracing of the disk wear scar. By varying the contact area of the pin it was possible to evaluate wear behavior of both unimplanted and implanted disks over a wide range of contact pressures. It is shown that stainless steel disk wear can be decreased by nitrogen ion implantation, provided that contact pressures remain less than the yield strength of the substrate material. No significant wear improvements were observed for 1018 steel. To evaluate improvements in hardness due to nitrogen ion implantation, very low penetration depth microhardness measurements were made and the indentation diagonals were measured in a scanning electron microscope. These results and their limitations are also presented.

Experimental and Theoretical Investigation of Twin-Entry Radial Inflow Gas Turbine With Unsymmetrical Volute Under Full and Partial Admission Conditions

2007 ◽  
Author(s):  
Habib Aghaali ◽  
Ali Hajilouy-Benisi
Keyword(s):  
Experimental Investigation ◽  
Steady State ◽  
Gas Turbine ◽  
Performance Prediction ◽  
Test Facility ◽  
Maximum Efficiency ◽  
Special Test ◽  
One Dimensional ◽  
Wide Range ◽  
Partial Admission

In this paper the performance characteristics of turbocharger twin-entry radial inflow gas turbine with unsymmetrical volute and rotor tip diameter of 73.6 mm in steady state and under full and partial admission conditions are investigated. The employed method is based on one dimensional performance prediction which is developed for partial admission conditions. Furthermore this method is developed for unsymmetrical volute of the turbine considering flow specifications. Experimental investigation of the research carried out on special test facility under full and partial admission conditions for a wide range of speed. The comparison of experimental and modeling results shows good agreements. Interestingly, the turbine maximum efficiency occurs when the shroud side inlet mass flow is higher than that of hub side.

scholarly journals Adaptation of a Small Commercial Fan Jet Trainer for Military Applications

1990 ◽  
Author(s):  
D. I. Boyd
Keyword(s):  
Field Experience ◽  
Development Program ◽  
Test Facility ◽  
Special Test ◽  
Design Features ◽  
Reliable Service ◽  
Military Applications ◽  
History Of ◽  
The Military ◽  
Military Combat

The JTI5D-4 engine is a successful small fan jet with a history of reliable service in fast, economical executive jet aircraft. This paper describes the unique design features which were necessary to convert it to the military combat trainer role, together with the associated development program. It includes details of a special test facility constructed to simulate aerobatic flight conditions, and discusses some aspects of field experience in a single engine trainer application.

scholarly journals Interpreting and reporting 40Ar/39Ar geochronologic data

2020 ◽  
Author(s):  
Allen J. Schaen ◽  
Brian R. Jicha ◽  
Kip V. Hodges ◽  
Pieter Vermeesch ◽  
Mark E. Stelten ◽  
...  
Keyword(s):  
Noble Gas ◽  
Data Sets ◽  
Mass Spectrometers ◽  
Collateral Information ◽  
Wide Range ◽  
Bearing Materials ◽  
Broad Variety ◽  
Dating Method ◽  
Interpretive Strategies

The 40Ar/39Ar dating method is among the most versatile of geochronometers, having the potential to date a broad variety of K-bearing materials spanning from the time of Earth’s formation into the historical realm. Measurements using modern noble-gas mass spectrometers are now producing 40Ar/39Ar dates with analytical uncertainties of ∼0.1%, thereby providing precise time constraints for a wide range of geologic and extraterrestrial processes. Analyses of increasingly smaller subsamples have revealed age dispersion in many materials, including some minerals used as neutron fluence monitors. Accordingly, interpretive strategies are evolving to address observed dispersion in dates from a single sample. Moreover, inferring a geologically meaningful “age” from a measured “date” or set of dates is dependent on the geological problem being addressed and the salient assumptions associated with each set of data. We highlight requirements for collateral information that will better constrain the interpretation of 40Ar/39Ar data sets, including those associated with single-crystal fusion analyses, incremental heating experiments, and in situ analyses of microsampled domains. To ensure the utility and viability of published results, we emphasize previous recommendations for reporting 40Ar/39Ar data and the related essential metadata, with the amendment that data conform to evolving standards of being findable, accessible, interoperable, and reusable (FAIR) by both humans and computers. Our examples provide guidance for the presentation and interpretation of 40Ar/39Ar dates to maximize their interdisciplinary usage, reproducibility, and longevity.

Investigation of Wear Behaviour ZA 27 Using Bio-Lubricants

2014 ◽  
Vol 550 ◽  
pp. 21-29
Author(s):  
M. Samuel Gemsprim ◽  
N. Babu ◽  
S. Parimala Murugaveni ◽  
P.R. Thyla
Keyword(s):  
Journal Bearing ◽  
Low Cost ◽  
Industrial Applications ◽  
Wear Behaviour ◽  
Base Oil ◽  
Wide Range ◽  
Milling Machines ◽  
Pin On Disc ◽  
Bearing Materials ◽  
Sliding Distance

— The Zinc–Aluminium (ZA) family of casting alloys are gaining wide commercial importance as journal bearing material for high load and low speed applications. These alloys, most notably ZA-27 is capable of replacing traditional bronze bearing at low cost. Recently, the ZA-27 alloy has been substituted for conventional journal bearing materials in a wide range of industrial applications. The journal bearings produced from these alloys have been used in earthmoving equipments, mining and milling machines, cable winches and compressors. The ZA-27 alloys and the bearings were also used in heavy and dusty environments such as underground machines, ore crashers and rock drills.The tribological properties of the ZA 27 alloy were tested using a Pin-on-Disc friction and wear tribotester.Sliding wear tests were performed using the tribotester by varying load, speed & sliding distance. The same tests are done with lubricating condition and also with bio lubricants. The Bio-lubrication is adopted in this work because of its biodegradability and eco-friendly nature. Especially the soya bean oil possess good lubrication properties. The wear rate of dry, base oil and bio lubricant oil condition were determined different applied load, speed and sliding distance compared with each other.

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