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Online since: June 2014
Authors: Fan Tang, Wei Wei, Li Jie Ding, Yu Fei Teng
This hydro turbine model can reflect the influence of surge tank and sharing common tunnel in the power system long term process,the accuracy of model is proved by comparison of simulation results and actual recording data in power system.
Comparison of simulation results and recording data Example 1: A hydraulic station with three units sharing long common tunnel, the rated head is 92m, rated flow of single unit is 62m3/s, length of common tunnel is 22.975km, cross –section of tunnel is 45.3m2, cylinder type surge tank diameter is 22m, pressure steel pipe inner diameter 5.8 m, total length is 391.3 m.
Fig.5 Active power curve of Unit 1 Fig.6 Active power curve of Unit 2 Because Unit 1 and Unit 2 sharing common tunnel, Unit 2 power reduction resulted in water pressure rising, then active power of Unit 1 increased almost 20% in opening regulation mode.
(3) Contrast analysis with measured disturbance data shows that this model can correctly reflect the medium and long term process dynamic response of the hydro units sharing long common conduit
Online since: January 2012
Authors: Wei Ping Zhang, Wei Zhang, Yi Jing Cai
Experimental Study on Eccentric Compression Behavior of Timber Columns with Longitudinal Cracks Strengthened by CFRP Sheets Yijing Cai1, a, Wei Zhang2,b Weiping Zhang3,c 1 Institute of Structural Engineering and Disaster Reduction, Tongji University, Shanghai 200092, China 2 Department of Bridge Engineering, Tongji University, Shanghai 200092, China 3 Department of Building Engineering, Tongji University, Shanghai 200092, China acai.yi.jing@hotmail.com, bintheendz@163.com, cweiping_zh@tongji.edu.cn Keywords: timber columns, longitudinal cracks, carbon fiber composite sheets, eccentric compression Abstract.
This test can provide detailed experimental data for the application of CFRP strengthening on timber columns under eccentric compression which is an efficient method to maintain the original historical structure.
In order to study the failure modes and bearing capacity recovery of the columns, a data automatic sampling and processing system was used to measure the applied load, the strains and the displacements of the columns.
The applied load, the strains and the displacements were recorded using a data automatic sampling and processing system.
Online since: May 2014
Authors: Nongyao Nai-Arun, Punnee Sittidech
Data mining tasks include data clustering, data association and data classification.
We can combine multiple models that lead to bias and vaiance reductions.
Each of these data sets is used to construct a classifier.
Patients’ data set.
Zhang, Empirical Study of Bagging Predictors on Medical Data, 9th Australasian Data Mining Conference, 121, 31-40, (2011) [8] J.
Online since: July 2014
Authors: Sasmita Sahu, Dayal R. Parhi
While focusing on transverse vibrations, a simple stiffness reduction of the damaged region was used.
Then the input data base is trained in the Fuzzy Controller to find the crack location (output), which is the ultimate goal of the present work.
Both representative data and expert knowledge are included in designing fuzzy rules, which conventionally include expert knowledge.
Edwards, Simplified Models for the location of Cracks in Beam Structures using Measured vibration data, Journal of Sound and Vibration 251(1) (2002) 13-38
Online since: March 2017
Authors: Bryan B. Pajarito, Kimberly A. Gines, Angelica S. Baluyut, Jennielyn Aina A. de Leon, Ralph P. Villa
Contour plots show reduction in ML when carbon black is replaced with a blend of bentonite and zeolite.
Data fitting, ANOVA, derivation of reduced hierarchical models, and contour plotting were conducted using Minitab 17 software [17].
These indicate the models fit the data results very well (even though the number of model terms is reduced), and that they are also good in predicting responses from new observations.
Cornell: Experiments with Mixtures: Designs, Models, and the Analysis of Mixture Data (John Wiley & Sons, New York 2002) [9] C.
Online since: August 2010
Authors: Nisha Kuruvilla, J.P. Raina, Arun Greig John, A. Athulya
Introduction The driving force behind rapid growth in integrated circuits (IC) manufacturing is the constant reduction in feature size (FS).
The relative variations in resistance due to diameter and metallic tube ratios were also analyzed from the simulated data.
During data analysis we selected the propagation delay of interconnects with varying length and constant diameter.
During this data analysis we selected the propagation delay of interconnects with varying lengths and constant metallic tube ratio.
Interconnect systems using SWCNT bundles can potentially provide a substantial delay reduction w.r.t.
Online since: September 2013
Authors: Ahmad Azlan Mat Isa, Haizuan Abd Rahman
Base on this investigation, frequency reduction was found on damaged panel on both boundary conditions and shows higher frequency reduction on fixed-fixed condition than free-free condition.
Fig. 3: Torsional pattern mode shapes under 4C boundary conditions of healthy and degrees of saw cut damaged specimens Fig. 4: Saw Cut Specimen 2 at 4C Fig. 5: EMA against OMA at 3rd degree damaged saw cut specimen Table 1: Comparison Data of Specimen 2 Frequency, ω [Hz] between OMA and Nastran Boundary Conditions Difference[%] between OMA & Nastran Specimen 2 Healthy [%] 1st degree [%] 2nd degree [%] 3rd degree [%] 1 edge clamped 38.4 34.5 31.5 29.8 2 edges clamped 33.1 33.5 25.9 34.3 3 edges clamped 26.6 30.3 27.3 22.2 4 edges clamped 22.7 20.1 22.5 25.7 free-free 37.4 46.2 41.4 30.2 As a conclusion, results show deviations which mean simulated frequency [Hz] from Nastran do not agree with measured frequency from OMA.
Based on Fig. 6, it was observed overall frequency data are close and mostly to the reference line (dotted line).
[14] Magalhaes F. and Cunha A., "Explaining operational modal analysis with data from an arch bridge," Mechanical Systems and Signal Processing, vol. 25, pp. 1431-1450, 6 August 2010
Online since: November 2016
Authors: Danuta Szeliga, Piotr Macioł, Łukasz Sztangret
Reduction of computational time is based on a concept of flexible (agile) structure of a multiscale model.
Therefore, a use of such models becomes problematic and looking for approximate methods that allow a reduction of computing times, while maintaining a required accuracy, seems to be an important task.
The accuracy of the metamodel, usually verified using statistical methods, depends on the used metamodelling technique and number of the measured data points.
However, each data point requires the time consuming simulation run and therefore it is advisable to reduce the number of data points which can be achieved using Sensitivity Analysis [9,10] or Design of Experiments [11].
Online since: December 2023
Authors: John G. Speer, Kip O. Findley, Pawan Kathayat, Lawrence Cho, Yuran Kong, Chris W. San Marchi, Joseph A. Ronevich
An analysis of both Ni and Mn alloyed austenitic steel slow strain rate tensile data by Gibbs et al. [5] suggests that the HE resistance of austenitic alloys has a strong correlation to stacking fault energy (SFE), where alloys with a calculated SFE greater than approximately 40 mJ/m2 had a relative reduction in area in hydrogen above 80 pct of the value in air.
In this paper, results are presented from one condition subjected to 20% cold rolling reduction and another condition subjected to 20% cold rolling and aged at 650 °C for one hour.
Notch tensile strength results from specimens tested in air (filled data points) and during in-situ electrochemical hydrogen charging (hollow data points).
Online since: June 2006
Authors: R. Navickas
However, the reduction of feature sizes down to 50 nm and below will require more advanced lithography tools.
Lateral etching, open partial etching, open partial oxidation, uniform (conformal) coating of relief and anisotropic open partial etching, and non-planar processes of the electrode self-formation are most frequently used for the reduction size of MEMS/NEMS.
B of Diffusion and Defect Data (Scitec Publications Ltd., Switzerland), Vols. 97-98 (2004), p. 229-234 [9] G.
B of Diffusion and Defect Data (Scitec Publications Ltd., Switzerland), Vols. 97-98 (2004), p. 235-238 [11] R.
B of Diffusion and Defect Data (Scitec Publications Ltd., Switzerland), Vols. 97-98 (2004), p. 215-220 a) b) d e b db bc bc bc bc n n+ p 2 2 1 ec
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