Development of High-Speed Industrial Turbo Blowers With Foil Air Bearings

2003 ◽  
Author(s):  
JongSik Oh ◽  
HeonSeok Lee
Keyword(s):  
High Speed ◽  
State Of The Art ◽  
Aerodynamic Performance ◽  
Compressed Air ◽  
Target Market ◽  
Test Results ◽  
Air Bearings ◽  
Production Lines ◽  
High Efficient ◽  
The World

In the paper, the development of high-speed industrial turbo blowers with foil air bearings is presented as a first successful commercialization in the world. Their target market is various from wastewater treatment to cement factory processes which require compressed air ranging between 0.6 and 0.8 bar gauge. Employing the state-of-the-art technology of the high-speed BLDC motors, the bump-type foil air bearings and the high-efficient turbo impellers/diffusers, so much compact, efficient and silent blower machines of a single stage are now available in the market, aiming to replace the existing inefficient, bulky and noisy ones, such as roots blowers. The first production lines are established for 75 and 150 hp class blowers. Rotational speeds up to 40,000 rpm are realized directly from the high-speed BLDC motors without any gear boxes, and no lubrication oil is required. A brief introduction of design, manufacture and test results is presented for mechanical, electrical and aerodynamic performance.

Foil Air/Gas Bearing Technology — An Overview

1997 ◽  
Author(s):  
Giri L. Agrawal
Keyword(s):  
High Temperature ◽  
Analytical Methods ◽  
High Speed ◽  
Test Results ◽  
Air Bearings ◽  
Mean Time Between Failure ◽  
Foil Bearing ◽  
Cryogenic Liquids ◽  
Gas Bearing ◽  
Mean Time

This paper summarizes the chronological progress of foil air bearings for turbomachinery during the last 25 years. Descriptions of various machines which are in production are provided. The foil bearing air cycle machine on the 747 aircraft has demonstrated an MTBF (mean time between failure) in excess of 100,000 hours. Many advantages of foil air bearings are noted. Various designs of foil air bearings presently in use and their relative merits are described. Analytical methods, their limitations, and their relationships with test results are noted. Descriptions of various machines built and tested in process fluids being gases, other than air, and cryogenic liquids are described. Conclusions are drawn that various high speed turbomachines including high temperature applications can be designed and developed using foil air bearings which will increase efficiency and reduce cost of these machines.

An Overview of Foreign Matter Invasion Systems for High Speed Railways

2013 ◽  
Vol 365-366 ◽  
pp. 468-473
Author(s):  
Qian Su ◽  
Wei Jiang ◽  
Xiao Xi Zhang ◽  
Yu Jie Li ◽  
Ling Ling Yang
Keyword(s):  
High Speed ◽  
State Of The Art ◽  
Warning System ◽  
Disaster Mitigation ◽  
Warning Systems ◽  
Foreign Matter ◽  
Basic Principles ◽  
High Speed Railway ◽  
The World ◽  
Safety And Stability

foreign matter invasion is a disastrous hazard regarding the safety and stability of high speed railway. Considering the fact that foreign matter invasion forecast is not matured yet,development of foreign matter invasion warning system is a very important countermeasure for foreign matter invasion disaster mitigation. Basic principles of the foreign matter invasion warning system and its application to railways are presented. The state-of-the-art of the foreign matter invasion warning systems for high speed railways around the world is introduced. Main points in development of the foreign matter invasion warning system for high speed railways are discussed, including layout of monitoring stations and monitoring means selection, with particular attention paid to railway safety operations. The present review is expected to be of significance to the development of the early warning system for high-speed railways in China.

HSCT Forward Swept Fan Performance

2003 ◽  
Author(s):  
Robert J. Neubert ◽  
Charles P. Gendrich
Keyword(s):  
High Speed ◽  
State Of The Art ◽  
Low Noise ◽  
Navier Stokes ◽  
Light Weight ◽  
Test Results ◽  
Flow Solver ◽  
Stall Margin ◽  
Fan Performance ◽  
Multi Stage

Previous experimental and analytical studies have demonstrated the potential for significant improvements in efficiency and stall margin with forward swept rotor blading. This paper extends the assessment to a light weight, low noise two stage fan designed and fabricated under the NASA High Speed Civil Transport program. The experimental investigation evaluates the effect of forward sweep on efficiency and stall margin relative to the predicted levels for a radial fan designed for the same requirements. Efficiency was above multi-stage fan state of the art and stall margin was significantly greater than predicted based on radial fan experience. In addition, the effects of increasing the axial gap between the IGV and rotor 1, as well as R1 to S1 axial gap are evaluated. The increased axial gap between R1 & S1 had a much greater effect on performance than increasing the IGV to R1 gap. And, 3D Navier-Stokes flow solver analysis was performed for comparison to test results.

scholarly journals High Speed PIV Measurements in Water Hammer

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Roberto Capanna ◽  
Philippe M. Bardet
Keyword(s):  
Experimental Study ◽  
High Speed ◽  
State Of The Art ◽  
Water Hammer ◽  
Compressed Air ◽  
Piv Measurements ◽  
Laser Measurements ◽  
Relaxation Coefficient ◽  
The Impact ◽  
Metal Wall

An experimental study addressing the challenge to measure relaxation coefficient of very fast phenomena such as water hammers is presented. An acrylic projectile containing water is accelerated and impacts a metal wall creating a water hammer. State of the art laser measurements techniques will be deployed in order to achieve such goal. A compressed air custom built cannon is used to accelerate the projectile and create the impact leading to the water hammer. First experimental results for Shadowgraphy and PIV measurements are presented and discussed with focus on the future development for the presented facility.

e-Infrastructures for Cultural Heritage Applications

2011 ◽  
pp. 341-369
Author(s):  
Giuseppe Andronico ◽  
Antonio Calanducci ◽  
Alessandro De Filippo ◽  
Giuseppe De Gregorio ◽  
Gaetano Foti ◽  
...  
Keyword(s):  
Cultural Heritage ◽  
High Speed ◽  
State Of The Art ◽  
High Speed Networks ◽  
Software Applications ◽  
Scientific Disciplines ◽  
Disciplinary Problems ◽  
The World ◽  
Geographically Distributed ◽  
And Storage

E-Infrastructures, made of high-speed networks and geographically distributed multi-domain computing and storage resources, are nowadays supporting many virtual research communities from various scientific disciplines all over the world, allowing their applications to run at a scale of complexity which allows unprecedented studies of very important multi/inter-disciplinary problems. In this chapter the authors show how such platforms can also be beneficial for arts, humanities and cultural heritage at large. Some exemplary hardware infrastructures, middleware services, and software applications will be shown, in order to provide the readers with updated information on the state of the art approaches.

The Innovation Cluster «The Velvet Way» and Ukrainian Scientific and Technical Break into the World Market of Building of High-Speed Railways

2010 ◽  
Vol 6 (2) ◽  
pp. 69-86
Author(s):  
B.Ye. Paton ◽  
◽  
M.D. Kostyuk ◽  
S.I. Kuchuk-Yatsenko ◽  
O.A. Mazur ◽  
...  
Keyword(s):  
High Speed ◽  
World Market ◽  
Innovation Cluster ◽  
The World

Experiences in Field Testing a Variety of Aeration Equipment in Sweden and in the U.S.A. by Offgas Analysis

1989 ◽  
Vol 21 (10-11) ◽  
pp. 1421-1429
Author(s):  
D. T. Redmon ◽  
W. C. Boyle ◽  
B. G. Hellstrom
Keyword(s):  
Oxygen Transfer ◽  
State Of The Art ◽  
Field Testing ◽  
Analysis Procedure ◽  
Test Results ◽  
Transfer Testing ◽  
Parallel Tests

The background and theory of the offgas analysis procedure used in oxygen transfer testing of diffused aeration tanks is reviewed. Correlation of this method with other applicable procedures in parallel tests is reported. State-of-the-art equipment and accessories are described. Advantages of the procedure are identified, as are precautionary considerations regarding its use. Applications considered appropriate for its employment are delineated. Experience and test results in both Sweden and the U.S.A. on a variety of aeration devices are disclosed.

scholarly journals Neuro-Inspired Computing with Spin-VCSELs

2021 ◽  
Vol 11 (9) ◽  
pp. 4232
Author(s):  
Krishan Harkhoe ◽  
Guy Verschaffelt ◽  
Guy Van der Sande
Keyword(s):  
Processing Speed ◽  
Delay Time ◽  
High Speed ◽  
State Of The Art ◽  
Polarization Modulation ◽  
Time Interval ◽  
Computing Technique ◽  
High Modulation ◽  
Short Time ◽  
Modulation Speed

Delay-based reservoir computing (RC), a neuromorphic computing technique, has gathered lots of interest, as it promises compact and high-speed RC implementations. To further boost the computing speeds, we introduce and study an RC setup based on spin-VCSELs, thereby exploiting the high polarization modulation speed inherent to these lasers. Based on numerical simulations, we benchmarked this setup against state-of-the-art delay-based RC systems and its parameter space was analyzed for optimal performance. The high modulation speed enabled us to have more virtual nodes in a shorter time interval. However, we found that at these short time scales, the delay time and feedback rate heavily influence the nonlinear dynamics. Therefore, and contrary to other laser-based RC systems, the delay time has to be optimized in order to obtain good RC performances. We achieved state-of-the-art performances on a benchmark timeseries prediction task. This spin-VCSEL-based RC system shows a ten-fold improvement in processing speed, which can further be enhanced in a straightforward way by increasing the birefringence of the VCSEL chip.

Effect of the strip spacing on the aerodynamic performance of a high-speed double-strip pantograph

2021 ◽  
pp. 1-17
Author(s):  
Zhiyuan Dai ◽  
Tian Li ◽  
Jian Deng ◽  
Ning Zhou ◽  
Weihua Zhang
Keyword(s):  
High Speed ◽  
Aerodynamic Performance

scholarly journals D-Penicillamine: The State of the Art in Humans and in Dogs from a Pharmacological and Regulatory Perspective

Antibiotics ◽  
2021 ◽  
Vol 10 (6) ◽  
pp. 648
Author(s):  
Michela Pugliese ◽  
Vito Biondi ◽  
Enrico Gugliandolo ◽  
Patrizia Licata ◽  
Alessio Filippo Peritore ◽  
...  
Keyword(s):  
Veterinary Medicine ◽  
State Of The Art ◽  
European Medicines Agency ◽  
Therapeutic Goals ◽  
First Choice ◽  
Regulatory Perspective ◽  
The World ◽  
United States Food ◽  
States Food ◽  
Food And Drugs Administration

Chelant agents are the mainstay of treatment in copper-associated hepatitis in humans, where D-penicillamine is the chelant agent of first choice. In veterinary medicine, the use of D-penicillamine has increased with the recent recognition of copper-associated hepatopathies that occur in several breeds of dogs. Although the different regulatory authorities in the world (United States Food and Drugs Administration—U.S. FDA, European Medicines Agency—EMEA, etc.) do not approve D-penicillamine for use in dogs, it has been used to treat copper-associated hepatitis in dogs since the 1970s, and is prescribed legally by veterinarians as an extra-label drug to treat this disease and alleviate suffering. The present study aims to: (a) address the pharmacological features; (b) outline the clinical scenario underlying the increased interest in D-penicillamine by overviewing the evolution of its main therapeutic goals in humans and dogs; and finally, (c) provide a discussion on its use and prescription in veterinary medicine from a regulatory perspective.

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