Search results

The results present a validation of the CFD approach against experimental data, explore the drag reduction mechanism and examine the performance of the modification in the presence of a moving floor and underbody roughness.
Experimental data was only available in [7] at an onset flow velocity of 40 m/s; however, given the narrow Reynolds number range used in this work (2.15 × 106 to 2.87 × 106) it is sufficient to validate the highest velocity.
At lower flow velocities the delta CD and CL showed poorer correlation with the experimental data, with a maximum difference of 2.4 counts for drag and 14 counts for lift.
Note that the CFD simulation was performed blind, prior to the release of the experimental data.
The RANS approach was validated against experimental data, accurately predicting the drag reduction.

At last, efficiency and applicability of this method is verified with a group of numerical simulation data.
The Neural Network established by training samples can implement nonlinear mapping between strength reduction factor and the monitor displacement data, as equation (3).
According to Finite Element model, horizontal displacement data of monitor point 1 to 4 is calculated under 14 strength reduction factors conditions.
Training samples are composed by displacement data under each strength reduction factor condition and its corresponding strength reduction factor, and train Neural Network.
At last a group of numerical simulation data is used to test the effective and practicality of this method.

Mechanical Diagnosis based on Similarity Extraction of Time Series Chunjie Lv Yongyu Yao Department of Mechanical Engineering, Luoyang Institute of Science and Technology Keywords: similarity, dimension reduction, fault diagnosis, historical data Abstract: The intelligent diagnosis emphasizes the processing method of knowledge of the historical data.
This paper discusses the possibility of the application of similarity extraction and pattern discovery of time series in fault diagnosis by using these historical data, presents the method of time series feature extraction and pattern matching, and advances the possibility of data clustering and pattern discovery based on dimension reduction.
So it is necessary to transform time series data.
DFT is a very transformation, which is separated from the common data.
Retention of 64 bit DWT coefficient Fig. 3 The graph after compression with DWT The results of Wavelet transform could also reflect the overall data trend through data reduction.

Abstract: The magneto-rheological (MR) vibration reduction control technology is studied and a design and implementation of an automobile MR vibration reduction control system based on ARM9 is given in this paper.
This system is able to achieve joint acquisition of multi-channel physical quantity of vibration and real-time control of MR damper, providing functions of online testing and acquisition of vibrating sensor signal and functions of management, storage, display and control the on-site collection data.
The controller based on ARM embedded processor, with CAN bus interface, high response speed and fine scalability, can realize transmitting the data acquired from field to the upper PC measurement and control platform through CAN bus, or receiving control information from the platform, or downloading the control algorithm, or communicating with other vehicle electronic devices in real time.
As for multiple-input multiple-output control system with PID control, fuzzy control or other control algorithms, control process contains a large amount of data processing.
Acquire vibration signal and control in real time and upload data and display vibration waveform on LCD screen; (2)Numerical display control: Acquire vibration signal and control in real time and upload data and display vibration number on LCD screen; (3)Control algorithm Setting: receive control algorithm from PC demand; (4)Communication parameter setup: receive PC command parameter, such as the communication rate,etc.

And CO2 reductions from inland waterborne transportation modes are therefore urgently required to reduce the impacts of climate change.
CO2 emissions from inland shipping of Jiangxi Province are calculated by utilizing activities based energy consumption data, and potential CO2 reduciton are estimated using ASIF equation.
As a result, there is a growing awareness about CO2 emission reduction from shipping.
The former methodology is used in this study by using fuel based emission factor’s and fuel consumption data to establish the aggregated emission figures as presented in Eq. (1)
Relative reduction potential of CO2 emission from water transport (r) can be estimated using Eq.(2)

The main earthquake prevention and disaster reduction law of American is “National Earthquake Hazards Reduction Program Reauthorization Act”.
Its main content is national earthquake disaster prevention and reduction planning.
The damaged statistical data is listed as Fig. 1A [2].
The damaged statistical data is shown as Fig. 1B [3].
A B Fig. 1 (A) Damaged data of all cultural relics’ protection units in Mianzhu city on Wenchuan earthquake; (B) Building damaged data in the ancient city area of Dujiangyan city on Wenchuan earthquake.

FCA has been applied to a variety of fields such as data mining, artificial intelligence software engineering ,information retrieval, database management systems, software engineering, knowledge acquisition and other aspects.
Recently, there has been growing interest in knowledge reduction in FCA.
Conclusion The rough set theory and the concept lattice theory show combination and complement for data analysis.
Information-preserving hybrid data reduction based on fuzzy-rough techniques.
Lv, A heuristic knowledge-reduction method for decision formal contexts.

The component of reduction gas is shown in Table 2.
According to some data, the influence of fine ore particle size is great on sticking behavior.
Therefore, sticking problem under fluidized state is a peculiar phenomena in reduction process or reduction atmosphere.
Degree of metallization or reduction.
The reduction degree of fine ore reduces slowly with the improvement of reduction temperature while the sticking is happening

This is the process of chromium ore smelting reduction in a converter.
Chrome Ore Reduction Characteristics and Principle of Selection.
The data from Table 1 show that the presence of Al2O3 makes Fe reduction more difficult and the presence of MgO makes Cr reduction slightly hard.
The reseachers consider that various reduction laws should respond in the reduction of the natural chromite.
Chen: Thermodynamic Data Manual of Inorganic Matters (Northeastern University Publications, Shenyang 1993)

AlN can be also synthesized by the carbothermal reduction of alumina in flowing N2 gas [3-4].
At the same time, much effort has been spent on the carbothemal reduction of alumina to produce aluminum [5-6].
The present work is aimed at investigating the carbothermal reduction of alumina in a vacuum.
Therefore the potential reactions of alumina with carbon are Eq.(1), Eq.(2) and Eq.(3) as follows: Al2O3 + 2C = Al2O(g) + 2CO(g) (1) Al2O3 + 3C = 2Al(g) + 3CO(g) (2) Al2O3 + C = 2AlO(g) + CO(g) (3) The relationships of Gibbs free energy vs temperature for the reactions were shown in Fig.2, calculated using the data of the HSC and the way of the reference [11].
According to the calculations, the reduction of Al2O3 to Al2O and Al should occur above 1671K and 1744K at 100Pa, respectively, and the reduction of Al2O3 to AlO should not occur at a temperature ranged from 1200K to 1900K.