scholarly journals Bench testing of hybrid ems prototype

2021 ◽  
Vol 7 (4) ◽  
pp. 14-32
Author(s):  
Sergey G. Akulitzky ◽  
Victor M. Amoskov ◽  
Darya N. Arslanova ◽  
Andrei A. Belov ◽  
N. Vasiliev Vyacheslav ◽  
...  
Keyword(s):  
Test Bench ◽  
Numerical Models ◽  
Measured Data ◽  
Stray Field ◽  
Practical Application ◽  
Steel Rail ◽  
Coil Current ◽  
Levitation Performance ◽  
Thick Steel ◽  
Bench Testing

Aim: To test the levitation performance of a hybrid EMS prototype. Materials and Methods: a levitation test setup with a 18 mm thick steel rail was constructed on a basis of the certified test bench 1958U-10-1 for measurement in the range up to 100 kN. The attractive force was investigated by varying the air gap size and coil current. Measured data were compared with parametric simulations. Results: Experimental and numerical results agreed with the accuracy required for practical application. Conclusions: A prototype of hybrid EMS (HEMS) for maglev transport has been designed, built, and tested at JSC NIIEFA. The HEMS concept has an advantage of reduced power loss and low stray field. The bench testing has proved good levitation performance and low power consumption of the proposed design. The measured data were used to check design solutions and verify 3D numerical models of the magnets. The comparison demonstrated a good match between measurements and simulations.

Researches on NOx Emissions from the Test Bench Testing of a Post Combustion Burner

2016 ◽  
Vol 841 ◽  
pp. 303-308
Author(s):  
Mihaela Cretu ◽  
Ene Barbu ◽  
Victoria Teleaba ◽  
Valeriu Vilag ◽  
Radu Mirea
Keyword(s):  
Air Quality ◽  
Natural Gas ◽  
Gas Turbine ◽  
Test Bench ◽  
Ambient Air ◽  
Measured Data ◽  
Pollutant Emissions ◽  
Restrictive Environment ◽  
Bench Testing ◽  
Efficient Work

The more and more restrictive environment requirements in the field of pollutant emissions of co-generative plants are imposing researches related to the more efficient work of those related to the post combustion facility. The paper presents the results of a post combustion burner achieved on a test bench, when it idling operates on natural gas mixed with air or with burned gases of a gas turbine. The modeling of the measured emissions, led to NOx concentrations in ambient air that are below the limits imposed by the in force regulations related to air quality and are correlated to the real time measured data.

Development of an Experimental Device to Study Real Connecting-Rod Bearings Functioning in Severe Conditions

2007 ◽  
Vol 129 (3) ◽  
pp. 647-654 ◽  
Author(s):  
Philippe Michaud ◽  
Aurelian Fatu ◽  
Bernard Villechaise
Keyword(s):  
General Principle ◽  
Test Bench ◽  
Numerical Models ◽  
Experimental Device ◽  
Test Results ◽  
Connecting Rod ◽  
Compression Loading ◽  
Key Points ◽  
Loading System

The paper presents a new experimental device made to analyze the thermoelastohydrodynamic (TEHD) behavior of connecting-rod bearings functioning in severe conditions. First, it focuses on the test bench description. The general principle of the test bench and then the main original technological solutions used with respect to the functional specifications are detailed. Two numerical models are described. They were developed in order to design and to validate two central components of the experimental device. Finally, the paper comments on the test results used to understand and validate the traction∕compression loading system, which is one of the key points in the test bench behavior.

Ultrasonic Detection Algorithm Research on the Damage Depth of Concrete after Fire

2011 ◽  
Vol 368-373 ◽  
pp. 2229-2234
Author(s):  
Jiang Tao Yu ◽  
Yuan Liu ◽  
Zhou Dao Lu ◽  
Peng Zhao
Keyword(s):  
Ultrasonic Method ◽  
Least Square Method ◽  
Detection Algorithm ◽  
Measured Data ◽  
Structural Member ◽  
Least Square ◽  
Propagation Time ◽  
Practical Application ◽  
Ultrasonic Detection ◽  
Damage Depth

To measure the depth of fire-damaged concrete by ultrasonic method, it was traditionally assumed that the concrete of the fire-damaged structural member could be simply classified into damaged layer and undamaged layer. Based on it, the damage depth can be calculated with a series of single-sided ultrasonic measured data. This method is simple and convenient but less accurate in the practical application. To improve the algorithm, hyperbola curves are adopted to simulate the varying of damage with depth in this paper. And parabolic curves are adopted to simulate the traces of ultrasonic wave in different measured distances. Therefore, the minimum propagation time can be obtained under different damage conditions. Through comparing the calculating results and measured data in different measured distances, the most likely damaged trend can be determined with least square method. At the end of this paper, examples are demonstrated to prove this algorithm feasible and more accurate than the traditional one.

scholarly journals STUDY AND ANALYSIS OF SILTATION AT NAHRE GHASR FISHERY PORT

2017 ◽  
pp. 36
Author(s):  
Mehrdad Orooghi Amidi ◽  
Mohsen Soltanpour ◽  
Zahra Ranji
Keyword(s):  
Flow Pattern ◽  
Suspended Sediment ◽  
Persian Gulf ◽  
Water Surface ◽  
Numerical Models ◽  
Dominant Role ◽  
Measured Data ◽  
Main Flow ◽  
Flow Mechanisms ◽  
The Persian Gulf

The discharge of Arvand River and tidal currents affect the large siltation at Nahre Ghasr Fishery Port, located at the Nahre Ghasr channel, the Persian Gulf. Using 2DH and 3D numerical models, the flow pattern at the channel was investigated to study the details of siltation problem. The local model was calibrated by the measured data of water surface and suspended sediment rate. The main flow mechanisms that can affect the rate of siltation including the horizontal exchange, the vertical exchange and tidal filling, were analyzed. The study showed that tidal filling plays the dominant role on the sedimentation at Nahre Ghasr channel. Different scenarios were also examined for reducing the siltation rate at the port.

Optimal Reliability-Based Design Using Support Vector Machines and Artificial Life Algorithms

2007 ◽  
pp. 59-79
Author(s):  
Jorge Hurtado
Keyword(s):  
Support Vector Machines ◽  
Earthquake Engineering ◽  
Artificial Life ◽  
Numerical Models ◽  
Optimal Solution ◽  
Support Vector ◽  
Practical Application ◽  
Reliability Based Design ◽  
Vector Machines ◽  
Reliability Based Optimization

Reliability-based optimization is considered by many authors as the most rigorous approach to structural design, because the search for the optimal solution is performed with consideration of the uncertainties present in the structural and load variables. The practical application of this idea, however, is hindered by the computational difficulties associated to the minimisation of cost functions with probabilistic constraints involving the computation of very small probabilities computed over implicit threshold functions, that is, those given by numerical models such as finite elements. In this chapter, a procedure intended to perform this task with a minimal amount of calls of the finite element code is proposed. It is based on the combination of a computational learning method (the support vector machines) and an artificial life technique (particle swarm optimisation). The former is selected because of its information encoding properties as well as for its elitist procedures that complement hose of the a-life optimisation method. The later has been chosen du to its advantages over classical genetic algorithms. The practical application of the procedure is demonstrated with earthquake engineering examples.

Study on Wheel Run-Out Detection System Based on Harmonic-Analysis Principle

2015 ◽  
Vol 738-739 ◽  
pp. 771-774
Author(s):  
Yu Zhuo Men ◽  
Xiao Dong Yang ◽  
Jin Gang Gao ◽  
Lei Yu ◽  
Hai Bo Yu
Keyword(s):  
Harmonic Analysis ◽  
Detection Method ◽  
Detection System ◽  
Moving Average ◽  
Digital Filtering ◽  
Measured Data ◽  
Practical Application ◽  
Online Detection ◽  
Filtering Method ◽  
System A

In order to reduce error of the wheel run-out detection system, a harmonic-analysis-based detection method was proposed to enhance the precision of online detection. The moving average filtering method was used for digital filtering between the axial and radial run-out errors so that to decrease the effect of outside noise on the measured data. Practical application shows that this system works stably and reliably on the wheel detection line and it realizes 100% online detection on the axial and radial run-out of work pieces, with the measurement error lower than 0.1mm.

Simply Discussion on the Research of the Carrying Capability of Suspended Sediment in Wave-Current Coexistent System

2012 ◽  
Vol 212-213 ◽  
pp. 477-481
Author(s):  
Jin Shan Zhang ◽  
Shen Dong Gan ◽  
Wei Sheng Zhang
Keyword(s):  
Suspended Sediment ◽  
Research Methods ◽  
Natural Water ◽  
Numerical Models ◽  
Coastal Areas ◽  
Measured Data ◽  
System 1 ◽  
Selection Of

It is vital to obtain the carrying capability formula of suspended sediment in wave-current coexistent system to develope sediment numerical models in coastal areas. We are looking for a formula, the results of which are more accurate in calculating the natural water-flow’s sediment-carrying capability.The key problem is how to reseach the carrying capability of suspended sediment in wave-current coexistent system scientifically.The auther of this paper points out the three points in the research of the carrying capability of suspended sediment in wave-current coexistent system:(1)research methods;(2) selection of the measured data;(3) fitting methods.

Transient Surface Temperature Measurement With Micro Sensors for Nanosecond Pulsed Laser Micromachining of Nickel

2006 ◽  
Author(s):  
Hongseok Choi ◽  
Xiaochun Li
Keyword(s):  
Laser Energy ◽  
Numerical Models ◽  
Pulsed Laser ◽  
Laser Micromachining ◽  
Measured Data ◽  
Time Resolved ◽  
Nanosecond Pulsed Laser ◽  
Thin Film Thermocouples ◽  
Transient Thermal ◽  
Thermal Phenomena

In order to investigate and understand the complicated transient thermal phenomena in laser micro processing, it is essential to accurately measure time-resolved temperatures of the workpiece. Micro thin film thermocouples with a micrometer spatial and nanosecond temporal resolution were fabricated on electroplated nickel workpieces to measure transient surface temperatures in nanosecond pulsed laser micromachining by ablation. Transient temperatures were successfully measured, and the effect of laser energy fluences on the peak temperatures was experimentally investigated. This study demonstrates that the micro TFTCs can be useful in measuring the transient temperatures on the workpiece during laser micromachining, and the measured data can be utilized to validate and improve existing analytical and numerical models.

scholarly journals CFD simulation of flow behind overflooded obstacle

2018 ◽  
Vol 66 (4) ◽  
pp. 448-456
Author(s):  
Yvetta Velísková ◽  
Zdeněk Chára ◽  
Radoslav Schügerl ◽  
Renáta Dulovičová
Keyword(s):  
Velocity Profile ◽  
Cfd Simulation ◽  
Numerical Models ◽  
Measured Data ◽  
Ansys Fluent ◽  
Laboratory Flume ◽  
Rans Models ◽  
Unsteady Rans ◽  
Computational Fluid Dynamics Cfd ◽  
Stress Models

Abstract This paper deals with studying of two topics – measuring of velocity profile deformation behind a over-flooded construction and modelling of this velocity profile deformation by computational fluid dynamics (CFD). Numerical simulations with an unsteady RANS models - Standard k-ε, Realizable k-ε, Standard k-ω and Reynolds stress models (ANSYS Fluent v.18) and experimental measurements in a laboratory flume (using ADV) were performed. Results of both approaches showed and affirmed presence of velocity profile deformation behind the obstacle, but some discrepancies between the measured and simulated values were also observed. With increasing distance from the obstacle, the differences between the simulation and the measured data increase and the results of the numerical models are no longer usable.

Study on the Horizontal Velocity Distribution in Natural Rivers

2014 ◽  
Vol 580-583 ◽  
pp. 1893-1896
Author(s):  
Hua Ge ◽  
Ling Ling Zhu ◽  
Xi Bing Zhang
Keyword(s):  
Regression Analysis ◽  
Theoretical Analysis ◽  
Velocity Distribution ◽  
Yangtze River ◽  
Numerical Models ◽  
Measured Data ◽  
The Yangtze River ◽  
Erosion And Deposition ◽  
Deposition Area ◽  
Natural Rivers

In this article, the horizontal flow velocity in natural rivers was studied, and its formula was established based on the theoretical analysis. Then some key parameters in the formula were determined by regression analysis based on large amount of measured data in the middle reaches of the Yangtze River. This formula can be widely applied in the allocation of the erosion and deposition area in 1D sediment numerical models.

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