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Online since: February 2012
Authors: Jun Chi, Lian Qing Chen, Xun Yang, Jian Liang Guo, Zhe Heng Zhang
The industrial computer communicates with the peripheral devices by using a kinetic control card and a data acquisition card.
Industrial computer Patch board Infeed servo driver Wheel servo motor Table servo motor Length feed servo driver Kinetic control card Patch board Main motion converter Wheel frequency motor Head stock frequency motor Rotary feed converter Data acquisition card Eddy sensor Workpiece deflection Transverse grating sensor Wheel location Length grating sensor Table location Fig. 1 Block diagram of the error compensation grinding system Fig. 2 shows power supply control scheme of the four motors.
The industrial computer sends a data signal to the solid state relay through the data acquisition card and patch board.
The data signal from the patch board is a TTL electrical level and thus can be recognized by the solid state relay.
Industrial computer Patch board Solid state relay Data acquisition card AC contactor Motor controllers Fig. 2 Scheme of power supply control There are two types of solid state relay widely used in the industrial control field and they are random and zero-passage types, respectively.
Online since: March 2007
Authors: P. Carrie Choi, Hang Yin Ling, Y.P. Zheng, Alan Kin Tak Lau
Extraction of the mechanical properties of the tissue mainly relies on analyzing the force-deformation data obtained from an indentation test.
The QLV parameters (Young's modulus, Poisson's ratio, time constant and viscosity-related constant) of tissue can be extracted by the optimization of the force-deformation data with the QLV model from the indentation test.
A hand-held indentation probe with a US pulser/ receiver is connected to a personal computer to display and process the collected data in real time using our tailor-made indentation software [2].
In the QLV model, the force response at any discrete time (i) can be reconstructed from the indentation history u(j) by proceeding the data reduction process [9], i.e., ij ≤≤1 , ( ) ( )( ) ( ) ( )[ ] ( )( ) ( ) ( ) [ ]       ∆−+−− −+ − = ∑= ∆⋅− i j tj tejiuEjiuEjiu iuEiuEiu ah iP 1 / 2 1 0 2 1 0 2 1 2 τ κ τ α κ ν (1) where t∆ is the time interval between two adjacent data points, ( )( )iuκ can be found in the kappa's tables according to corresponding aspect ratio (a/h), Poisson's ratio (v) and indentation deformation (w/h) by interpolation and extrapolation. ( )uE e)( is the un-relaxed elastic modulus and ( )tG is the reduced relaxation function for which ( ) 10 =G . i.e. ( ) uEEuE e 10 )( += and ( ) τ αα / 1 t e tG − +−= , where 0E is the initial modulus, 1E is the non-linear factor, τ is the time constant and α is the viscosity-related constant.
Extraction of the mechanical properties of soft tissue can be obtained by solving the optimization problem about minimizing the root mean squared (RMS) error between Eq. (1) and the load-deformation data obtained experimentally [6].Genetic algorithm (GA) is proposed in the current study to tackle this optimization problem.
Online since: May 2012
Authors: Jiu Ju Cai, Jing Yu Liu
To carry out the overall energy consumption analysis has many variations, and analysis and measurement data are not precise enough.
If the production process is reduced to each process, data will be more precise.
According to a practical production data, energy consumption were analyzed effectively.
Steelmaking energy flow data as shown in the following table.
Residual heat and energy recovery value of S represents and the energy flow dissipation value of R represents have the greatest impact on steelmaking process in these three weeks, other energy flow data fluctuation effect is no significant change.
Online since: July 2014
Authors: Li Guo Wang, Jing Hui Yang, Jin Xi Qian
The main feature of remote sensing image is that they have a very high spectral resolution, so they can obtain very narrow band ranges and get a large number of spectral bands, which could result in a continuous spectrum image data that containing a wealth of information [2].
It needs to be emphasized that the remote sensing data should be treated as images instead of a mere collection of independent and identically distributed pixels [6].
The implementation procedure of the proposed method is as follows: First of all, extracting the image features from the original remote sensing data.
Meanwhile, extract the spectral features using the PCA algorithm, which is a widely used dimensionality reduction technology in data analysis [1].Also, it computes the low-dimensional representation of a high-dimensional data set, and the algorithm can most faithfully preserve its covariance structure [7].
In order to obtain , the following equation needs to be solved [9]: (2) where is a compromise fact between data reconstruction and the sparsity, satisfying .
Online since: July 2014
Authors: Da Hua Li, Chao Shen
Introduction As the pillar industry of national economy, construction industry has always faced with problems such as low efficiency, severe resource waste, how to conduct energy conservation and emissions reduction.
It is a data model that based on 3D technology and integrated with various kinds of relevant information in construction project, which is a comprehensive expression of the relevant information about the project.
There is a bidirectional data exchange in BIM model.
Which kinds of form and the model of the maturity of the interactive data between the parties also need to be clearly defined.
Therefore, absorbing advantages of the reinforcement information expressions and its information and using computer to digital processing method of standard components will adapt the graphic symbols and data correlation to meet the requirement of BIM viable path.
Online since: January 2021
Authors: Ming Dong Yi, Jing Jie Zhang, Chong Hai Xu, Zhao Qiang Chen, Guang Chun Xiao, Ben Yuan Wang
In order to explain this phenomenon, through scanning electron microscopy (SEM) scanning and energy spectroscopy (EDS) elemental analysis, the wear reduction mechanism of solid lubricants was analyzed, that is, during the cutting process, nano solid lubricants precipitated and formed lubricating film on the rake surface of the tool to reduce the friction coefficient.
The self-lubricating tool means that the tool material itself has the function of friction reduction and anti-wear.
The experimental data are substituted into the formula to obtain the friction coefficient in the cutting of two ceramic tools, as shown in the following figure: Figure 4 Friction coefficient comparison between AT and ATC ceramic tools As shown in Figure 4, the friction coefficient of ATC ceramic tool with nano solid lubricants during cutting is smaller than that of AT ceramic tool without solid lubricants.
In summary, the addition of solid lubricant CaF2 effectively reduces the friction coefficient of the tool, thereby reducing the heat generated by friction, which is also the main reason for the reduction in cutting temperature.
During the cutting process, the reduction of cutting temperature is helpful to reduce the thermal deformation of the workpiece, and at the same time reduce the thermal wear of the tool and increase the tool life.
Online since: May 2014
Authors: Sung Woo Shin, Choul Woong Kwon
Fig. 1: TAS numerical model (a) Plan, (b) Perspective and (c) Front façade of the classroom The calculated data is compared with that of using fixed canopies with different transparencies: 0%, 50% and 90%.
Table 1: Input data for classroom Design variables Classroom built recently Design variables Classroom built recently Orientation Wall insulation Roof Infiltration Ventilation Glazing ratio S,N,E,W U=0.25 W/m2K U=0.35 W/m2K 0.5 ACH Natural ventilation via openable window 40% Window U-value Room dimensions Canopy dimensions Reflectance Material of the transitional space U=2.974 W/m2K 9m (w) x 7m(d) x 2.9m (h) 9m (w) x 5m (d) Glass material with 0%, 50%, 90% transparency Ground 0.2 Canopy 0.5 Brick To meet the seasonal environmental requirements, the flexible canopy concept is explored to adapt itself as seen in Fig. 2.
The main idea of a flexible canopy has been initiated in order to overcome the limitations of a fixed type of canopy in terms of indoor energy reduction.
Online since: May 2014
Authors: Yi Zhen Liu, Xian Yu Deng, Jing Yu
So it is reliable and convenient for data processing to improve the working efficiency of the production site.
Conclusion This system can effectively solve many problems in the production, such as reducing the fault in the process of production, shorting the production preparation time, reducing the labor intensity of workers, creating considerable economic benefits and social benefits, achieving the purpose of energy saving and consumption reduction.
Supervision and data acquisition system and its application.
Online since: October 2014
Authors: Zhen Wang, Ying Liu
In comparison with other oxidative enzymes, laccase is reported to be relatively unspecific and be capable of catalyzing the oxidation of a wide range of phenolic compounds and aromatic amines with simultaneous reduction of its co-substrate of oxygen to water [4,5].
From the XRD image of data in Fig. 1, the preparation of magnetic carriers are magnetite Fe3O4 crystal nucleus.
From the data in table 2, free laccase increase COD of wastewater.
Online since: August 2013
Authors: Hai Feng Li, Yu De Xu, Xiao Jun Mao
In this paper, a new method based on four-point chord reference method is put forward, and therefore its detection accuracy is analyzed and verified by simulation and field test data.
Especially, when m is decreased from 150mm to 50mm, they become steady, which indicates that further reduction of m will not make much improvement in average error and standard error.
Analysis of the detection precision based on field test data A trolley with m=150mm, n=700mm and k=50mm transducers spacing measured the rail short wavelength irregularities on Shanghai Metro.
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