scholarly journals A method of laser ultrasound tomography for solid surfaces mapping

2018 ◽  
Vol 145 ◽  
pp. 05009 ◽  
Author(s):  
Vasily Zarubin ◽  
Anton Bychkov ◽  
Alexander Karabutov ◽  
Varvara Simonova ◽  
Elena Cherepetskaya
Keyword(s):  
High Performance ◽  
Surface Profile ◽  
Solid Surfaces ◽  
Laser Ultrasound ◽  
Ray Method ◽  
Ultrasound Tomography ◽  
Bodies Of Revolution ◽  
Suggested Approach ◽  
Preliminary Preparation ◽  
Production Inspection

Surface control is an important problem for production inspection in industry. Traditionally it is solved using mechanical and optical profilometry, providing high spatial resolution. However, such methods are inappropriate for bodies immersed in opaque liquids and require preliminary preparation of samples. Current work focuses on an application of a method of laser ultrasound tomography to mapping of solid surfaces. The suggested approach combines high acoustical resolution, high performance and allows profilometry of contaminated and immersed samples. An automated prototype for real-time surface profile measurements is constructed and tested on several bodies of revolution. Linear approximation of a cylinder profile obtained by the prototype shows maximum approximation inconsistency of 15 μm. The results are verified by those obtained by the conventional x-ray method.

Surface Profile Analysis for Conformable Interfaces

2003 ◽  
Vol 125 (3) ◽  
pp. 624-627 ◽  
Author(s):  
Mark C. Malburg
Keyword(s):  
Contact Area ◽  
Load Distribution ◽  
Profile Analysis ◽  
Surface Profile ◽  
Solid Surfaces ◽  
Analysis Method ◽  
Uniform Load ◽  
Morphological Filtering ◽  
Novel Method

This paper presents a novel method for the analysis of solid surfaces in contact with a conformable component. These applications are common in many engine and hydraulic applications, wherein conformable seals, gaskets, bushings, etc. are employed to prevent unwanted flow across an interface or provide a uniform load distribution. The proposed analysis method employs a combination of meanline (m-system) filtering and envelope (e-system) or morphological filtering. Through this analysis, a simulation of contact area and the associated voids or gaps can be assessed.

Optimal Static Characteristics of Amphibious PAR Vehicles

2008 ◽  
Vol 130 (3) ◽  
Author(s):  
Konstantin I. Matveev
Keyword(s):  
Water Surface ◽  
High Performance ◽  
Static Friction ◽  
Solid Surfaces ◽  
Vertical Position ◽  
Optimal Position ◽  
Optimal Values ◽  
Jet Theory ◽  
New Generation ◽  
The Ideal

Power augmented ram platform vehicle is a high-performance air-assisted amphibious transport of the new generation. The objective of this study is to determine the optimal position of the platform flap for low-speed operations on water and solid ground. The static friction of vehicle hulls on solid surfaces and the static deformation of the water surface are combined with results of the ideal jet theory to predict forces and the platform position. The optimal values for the flap gap are obtained that maximize the recovered static thrust on solid surfaces and the vehicle vertical position on the water surface.

scholarly journals Predictive Direct Torque Control of Switched Reluctance Motor for Electric Vehicles Drives

2020 ◽  
Author(s):  
Reyad Abdelfadil ◽  
László Számel
Keyword(s):  
Electric Vehicles ◽  
High Performance ◽  
Direct Torque Control ◽  
Switched Reluctance Motor ◽  
Power Converter ◽  
Torque Control ◽  
Switching Frequency ◽  
Suggested Approach ◽  
Switched Reluctance ◽  
Reluctance Motor

The electrical drive systems utilized in Electric Vehicles (EVs) applications must be reliable and high performance. To providing these specifications, it is essential to design high-efficiency electric motors and develop high-performance controllers. This study introduces direct torque control of Switched Reluctance Motor (SRM) for electric vehicle applications using Model Predictive Control (MPC) technique. The direct torque control using MPC is proposed to maintain the motor torque and motor speed to tracking desired signals with a satisfactory response. In this study, the MPC algorithm was programmed in C- language, and the simulation tests were performed using a non-linear model of 6/4 - 60 kW SRM that is fed with the symmetrical converter. The proposed controller was tested under different load conditions to verify the robustness of the controller, as well as at variable speeds to investigate the tracking performance. Thanks to the proposed method, the SRM torque ripples, stator copper losses, and average switching frequency of the power converter can reduce effectively due to applying a cost function that combines multiple objectives. The obtained outcomes show the effectiveness of the suggested approach compared to conventional direct torque control techniques.

Investigation of solid surfaces by high-performance liquid chromatography

1992 ◽  
Vol 592 (1-2) ◽  
pp. 121-126 ◽  
Author(s):  
A.E. Chalykh ◽  
L.N. Kolomiets ◽  
O.G. Larionov ◽  
N.I. Vinogradova
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Solid Surfaces

Iterative design of a nitrate controller using an external carbon source in an activated sludge process

1998 ◽  
Vol 37 (12) ◽  
pp. 95-102 ◽  
Author(s):  
Pericles R. Barros ◽  
Bengt Carlsson
Keyword(s):  
Carbon Source ◽  
Activated Sludge ◽  
High Performance ◽  
Controller Design ◽  
Wastewater Treatment Plants ◽  
Design Procedure ◽  
Pole Placement ◽  
Activated Sludge Process ◽  
Suggested Approach ◽  
External Carbon Source

More stringent effluent and cost requirements are increasing the need for better control of wastewater treatment plants. In an activated sludge process, the nitrogen removal efficiency may be improved by adding an external carbon source. In this paper, automatic control of the nitrate level by regulating external carbon flow is discussed. More specifically, an iterative tuning procedure for the controller is outlined. Iterative controller design schemes aim at tuning high performance controllers of low complexity using closed loop data. The basic strategy used in this paper is an iterative pole placement controller design procedure. The suggested approach is compared with conventional design in a simulation study.

High-performance fiber laser ultrasound detectors

2015 ◽  
Author(s):  
Yizhi Liang ◽  
Long Jin ◽  
Linghao Cheng ◽  
Zhaohui Li ◽  
Bai-Ou Guan
Keyword(s):  
Fiber Laser ◽  
High Performance ◽  
Laser Ultrasound ◽  
High Performance Fiber

Real-Time Laser Ultrasound Tomography for Profilometry of Solids

2018 ◽  
Vol 73 (1) ◽  
pp. 75-82 ◽  
Author(s):  
V. P. Zarubin ◽  
A. S. Bychkov ◽  
A. A. Karabutov ◽  
V. A. Simonova ◽  
I. A. Kudinov ◽  
...  
Keyword(s):  
Real Time ◽  
Laser Ultrasound ◽  
Ultrasound Tomography

scholarly journals Simultaneous three-dimensional photoacoustic and laser-ultrasound tomography

2013 ◽  
Vol 4 (8) ◽  
pp. 1380 ◽  
Author(s):  
Gerhild Wurzinger ◽  
Robert Nuster ◽  
Nicole Schmitner ◽  
Sibylle Gratt ◽  
Dirk Meyer ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Laser Ultrasound ◽  
Ultrasound Tomography

Paper 13: Abrasive Wear of Journal Bearings by Particles in the Oil (Apparatus, Experiments, and Observations)

1965 ◽  
Vol 180 (11) ◽  
pp. 21-31 ◽  
Author(s):  
J. J. Broeder ◽  
J. W. Heijnekamp
Keyword(s):  
Journal Bearing ◽  
Surface Profile ◽  
Friction Torque ◽  
Solid Particles ◽  
Solid Surfaces ◽  
Carrier Fluid ◽  
Additional Information ◽  
Hard Particles ◽  
Plastic Materials ◽  
Silicon Carbide Particles

Abrasion is generally defined as wear caused by fine solid particles. In this paper the term abrasion will refer only to wear caused by hard particles introduced into and entrained by a fluid flowing between two solid surfaces, the particles possibly becoming embedded in one of these surfaces. For the study of this type of wear a plain journal bearing was considered suitable. Arguments for this choice and a description of the apparatus are given. The use of an aerostatic bearing for the application of load to the plain journal bearing has made friction torque measurement feasible. The abrasives used were silicon carbide particles of very narrow size distributions; the carrier fluid was a mixture of a straight mineral oil and n-hexadecane. The wear of the shaft was determined by measuring its surface profile, the wear of the bush by measuring its deviation from roundness. Various combinations of materials were investigated. In most cases hardened steel shafts and soft bronze bushes were used. In addition, some plastic materials served for the bushes; steel, bronze, and aluminium were applied both as bush and as shaft material. Embedding of particles was observed at various places in the bushes, which were usually softer than the shaft. Additional information on the wear processes was obtained by microscopical inspection of the worn surfaces. Results of the experiments are discussed.

Determination of Cavity Detachment for Sheet Cavitation

2007 ◽  
Vol 129 (9) ◽  
pp. 1105-1111 ◽  
Author(s):  
Eduard Amromin
Keyword(s):  
Experimental Data ◽  
Special Kind ◽  
Flow Speed ◽  
The Body ◽  
Bodies Of Revolution ◽  
Suggested Approach ◽  
Sheet Cavitation ◽  
Fluid Theory ◽  
Entire Flow ◽  
The Difference

Sheet cavitation has been traditionally analyzed with ideal fluid theory that employs the cavitation number as the single parameter. However, characteristics of cavitation can significantly depend on location of cavity detachment. According to known experimental data, this location is influenced by the freestream speed and the body/hydrofoil size. As shown in this paper, it takes place because of the combined effect of the Reynolds number and Weber number. Here, sheet cavitation is considered as a special kind of viscous separation caused by the cavity itself. The viscous-inviscid interaction concept is employed to analyze the entire flow. Validation of the suggested approach is provided for hydrofoils and bodies of revolution. The effects of flow speed, the body size, and its surface wettability are illustrated by comparison of computed cavity length/shape to the known experimental data. The difference between cavity detachment in laminar and turbulent boundary layers is discussed.

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