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Online since: December 2013
Authors: Hua Wang, You Ling Li
The measuring data of the enterprise becomes crucial importance.
All kinds of raw materials metering data of the measurement of enterprise become crucial importance.
The weighing information is print by paper printer print to ensure the uniqueness of the data and overcome the error of artificial.
The back-end concentrates in the center of the hall of measurement data.
According to the way of data transmission, weighing processing unit, scheduling prediction unit, data maintenance unit and B/S query unit respectively connected to the server unit.
All kinds of raw materials metering data of the measurement of enterprise become crucial importance.
The weighing information is print by paper printer print to ensure the uniqueness of the data and overcome the error of artificial.
The back-end concentrates in the center of the hall of measurement data.
According to the way of data transmission, weighing processing unit, scheduling prediction unit, data maintenance unit and B/S query unit respectively connected to the server unit.
Online since: January 2012
Authors: Qun Dang, Xiao Li Lei
According to Doppler’s different impacts on the correlation Peak and data demodulation, PN-code is acquired through single channel matched-filters, and parallel multi-channel correlators are used in the data demodulation branch channel.
Identical phase data and quadrature-phase data can be expressed by (5) and (6)
(5) (6) By judging identical phase data I3 is positive and negative, the demodulation data can be attained.
The most additional phase shift brought by identical phase data: 2πfdT=0.21π, reduction of SNR: 20lg(cos(0.21π))=-2db.
Therefore, taking parallel three-way channel scheme into data demodulation method, polarity reverse of data can be avoided, and deterioration extent of SNR can be reduced.
Identical phase data and quadrature-phase data can be expressed by (5) and (6)
(5) (6) By judging identical phase data I3 is positive and negative, the demodulation data can be attained.
The most additional phase shift brought by identical phase data: 2πfdT=0.21π, reduction of SNR: 20lg(cos(0.21π))=-2db.
Therefore, taking parallel three-way channel scheme into data demodulation method, polarity reverse of data can be avoided, and deterioration extent of SNR can be reduced.
Online since: February 2014
Authors: Shou Ming Zhou, Qing Jie Sun, Ji Gui Zheng, Hong Xing Wu
Torque Ripple Reduction of Switched Reluctance Motor by Optimizing Stator Pole Type
Hongxing Wu, Qingjie Sun , Jigui Zheng, Shouming Zhou
School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin, China
awhx0422@sina.com, bsqj0602@126.com , c zhengjigui@163.com, d zhoush.m@163.com
Keywords: Switched Reluctance Motor; Torque Ripple; Structural Optimization
Abstract.
Therefore, the improvement of motor design improvements can realize the reduction of torque ripple to some extent.
Torque waveform of 60° wedge angle Different wedge angles have some influence on the torque ripple at the cost of average torque, specific data as follows: Table 1 The torque ripple coefficient of different wedge angles Original scheme Improved 90° wedge angle 60° wedge angle KT 1.22 0.71 0.81 1 After comparison, it’s clear that the measure to improve stator poles slows the abrupt change of torque effectively when stator poles coincide with rotor poles.
Learning Rate Functions in CMAC Neural Network Control for Torque Ripple Reduction of Switched Reluctance Motors[J].
Therefore, the improvement of motor design improvements can realize the reduction of torque ripple to some extent.
Torque waveform of 60° wedge angle Different wedge angles have some influence on the torque ripple at the cost of average torque, specific data as follows: Table 1 The torque ripple coefficient of different wedge angles Original scheme Improved 90° wedge angle 60° wedge angle KT 1.22 0.71 0.81 1 After comparison, it’s clear that the measure to improve stator poles slows the abrupt change of torque effectively when stator poles coincide with rotor poles.
Learning Rate Functions in CMAC Neural Network Control for Torque Ripple Reduction of Switched Reluctance Motors[J].
Online since: March 2012
Authors: Hong Zhang, Chang Bo Shao
Data Processing of the Logistics System
The early processing on the data of the internal resources of the database is mainly to ensure the operation efficiency of logistics system and prevent the data errors from hindering the operation of the system.
And a comprehensive data mining can help acquire more reliable information.
Through the data processing, conditions can be created for the data mining.
Relevance Principle in the Data Mining The application of the data correlation method in the data mining derived from the "relevance principle", which relies on all kinds of the correlation factors in the half-structural data source.
Discussion on the Algorithm of the Association Rules of Data Mining [J].
And a comprehensive data mining can help acquire more reliable information.
Through the data processing, conditions can be created for the data mining.
Relevance Principle in the Data Mining The application of the data correlation method in the data mining derived from the "relevance principle", which relies on all kinds of the correlation factors in the half-structural data source.
Discussion on the Algorithm of the Association Rules of Data Mining [J].
Online since: August 2017
Authors: Manish Kewalramani, Osama Ahmed Mohamed, Waddah Al Hawat
Experimental data was based on standard 150 mm x 300 mm cylinders and 150 mm x 150 mm x 500 mm prisms.
The high value of R2 = 0.9 indicates strong correlation between the experimental data and prediction formula
Data points used for proposed empirical relation between flexural strength and splitting tensile strength.
Another regression analysis was performed on the same data set shown in Table 3 to derive the coefficient, k, when the power n = 0.5.
Schutter, Modulus of elasticity and tensile strength of self-compacting concrete: Survey of experimental data and structural design codes, Cem.
The high value of R2 = 0.9 indicates strong correlation between the experimental data and prediction formula
Data points used for proposed empirical relation between flexural strength and splitting tensile strength.
Another regression analysis was performed on the same data set shown in Table 3 to derive the coefficient, k, when the power n = 0.5.
Schutter, Modulus of elasticity and tensile strength of self-compacting concrete: Survey of experimental data and structural design codes, Cem.
Online since: September 2024
Authors: Valerii Maksymenko, Nataliia Kostyra, Mariia Barabash
During an explosion, air shock waves occur in the atmosphere, spreading in the form of a compression-reduction zone at its front of pressure, temperature, density and velocity of the medium particles (mass velocity).
Therefore, data on the shock wave in the far zone are of the greatest interest.
(6) Parameters with an index 0 are usually taken from international standard atmosphere data only at sea level (ISA): МPа, kg/m3, K.
The calculated minimum reduction coefficient (reduction of seismic reactions) is sufficient to withstand emergency shock and seismic loads on the structure: Rμ=2μ-1=2∙1.905-1=1.67.
The maximum coefficient of compliance of the elastic-plastic system µ=8.53, and the calculated minimum coefficient of reduction (reduction of seismic reactions) Rµ=1.67 were obtained, which indicates that the structural scheme of the buried structure has a sufficient provision of plastic deformations to withstand emergency effects on it.
Therefore, data on the shock wave in the far zone are of the greatest interest.
(6) Parameters with an index 0 are usually taken from international standard atmosphere data only at sea level (ISA): МPа, kg/m3, K.
The calculated minimum reduction coefficient (reduction of seismic reactions) is sufficient to withstand emergency shock and seismic loads on the structure: Rμ=2μ-1=2∙1.905-1=1.67.
The maximum coefficient of compliance of the elastic-plastic system µ=8.53, and the calculated minimum coefficient of reduction (reduction of seismic reactions) Rµ=1.67 were obtained, which indicates that the structural scheme of the buried structure has a sufficient provision of plastic deformations to withstand emergency effects on it.
Online since: March 2013
Authors: Jun Jie Zhang, Xian Ming Zhu, Zhi Zhong Liu
Ko [4] investigated the structure-borne noise reduction for infinite elastic cylindrical shell with elasticity equation, and utilized the insertion loss of the pressure to describe the effect of coated layer.
The baseline data used for the calculations is in reference [4,5].
The explanations are as follows: When thicknesses of coated layer is equal to integral multiple of half wavelength plus one-quarter wavelength[4,5], the maximum amount of the noise reduction is obtained.
(8) And when thicknesses of coated layer is equal to integral multiple of half wavelength[4,5], the minimum amount of the noise reduction is obtained.
The baseline data used for the calculations is in reference [4,5].
The explanations are as follows: When thicknesses of coated layer is equal to integral multiple of half wavelength plus one-quarter wavelength[4,5], the maximum amount of the noise reduction is obtained.
(8) And when thicknesses of coated layer is equal to integral multiple of half wavelength[4,5], the minimum amount of the noise reduction is obtained.
Online since: September 2015
Authors: Michal Kotoul, Ivo Dlouhy, Petr Skalka
We show that the superposed bridging mechanism strongly interacts with the inherent rigidity effect of gradient elasticity, hence the total reduction of the J-integral will be likely more pronounced than a mere sum of these two contributions.
To this end a homogenized cracked Bioglass® foam is analyzed using the strain/stress-based Ru-Aifantis [4] approach which is extended to enforce the equilibrium of nonlocal stresses via the Lagrange multiplier method, since the original Ru-Aifantis approach does not provide us with data concerning the cups-like closure of crack caused by the inherent rigidity effect of gradient elasticity.
Thus, the total reduction of the J-integral calculated along a remote path is given by the resisting force arising from the bridging traction and the reduction of the crack tip extension force.
To this end a homogenized cracked Bioglass® foam is analyzed using the strain/stress-based Ru-Aifantis [4] approach which is extended to enforce the equilibrium of nonlocal stresses via the Lagrange multiplier method, since the original Ru-Aifantis approach does not provide us with data concerning the cups-like closure of crack caused by the inherent rigidity effect of gradient elasticity.
Thus, the total reduction of the J-integral calculated along a remote path is given by the resisting force arising from the bridging traction and the reduction of the crack tip extension force.
Online since: October 2012
Authors: Ya Qun Zhou, Wei Ping Wang, Hai Yan Deng
The recharge volume
Based on the analysis of rainwater quantity and quality, the available rainfall of roof is calculated by the following formula [2]:
Q=Ψ·α·β·A(H·10-3)
Where: Q is the annual average available rainfall of roof (m3); Ψ is the runoff coefficient, which equals 0.9; α is the seasonal reduction coefficient; β is the initial rainwater removal coefficient; A is the horizontal projection of roof area (m2); H is the average annual rainfall (mm).
The seasonal reduction coefficient (α) must be determined by the analysis of multi-year statistics of local Weather Bureau.
Considering the factors such as climate, seasons and so on, the seasonal reduction coefficient of the available rainfall in Jinan was determined as 0.85.
Based on the data of rainfall and water quality, the initial rainwater removal coefficient was decided as 0.85.
The seasonal reduction coefficient (α) must be determined by the analysis of multi-year statistics of local Weather Bureau.
Considering the factors such as climate, seasons and so on, the seasonal reduction coefficient of the available rainfall in Jinan was determined as 0.85.
Based on the data of rainfall and water quality, the initial rainwater removal coefficient was decided as 0.85.
Online since: January 2005
Authors: Shi Fang Xiao, Yu Hu Wang
The obtained data are listed in
table 1.
From Fig.2, we can also see the flow 2.0 2.5 3.0 3.5 4.0 4.5 2 3 4 5 6 7 8 9 10 11 12 Stress (GPa) Mean grain size (nm) Compression flow stress Tension flow stress Compression yield stress Tension yield stress Fig. 1 The yield and flow stress variation along with mean grain size in tension and compression simulation 0.0 -0.2 -0.4 -0.6 -0.8 -1.0 0 -5 -10 -15 -20 Stress (GPa) Strain 4.23 nm 3.55 nm 2.66 nm 2.13 nm Ⅰ Ⅱ Ⅲ Fig. 2 The stress-strain curves of nanocrystalline Fe under compression condition stress decrease with the reduction of mean grain size.
It is possible the grain boundary as a special phase and the function of grain boundary as shear sliding band disappears as the reduction of systematic order degrees resulted in region Ⅰ.
Summary (1) The yield and flow stress of nanocrystalline Fe decrease with reduction of grain size in tension and compression.
From Fig.2, we can also see the flow 2.0 2.5 3.0 3.5 4.0 4.5 2 3 4 5 6 7 8 9 10 11 12 Stress (GPa) Mean grain size (nm) Compression flow stress Tension flow stress Compression yield stress Tension yield stress Fig. 1 The yield and flow stress variation along with mean grain size in tension and compression simulation 0.0 -0.2 -0.4 -0.6 -0.8 -1.0 0 -5 -10 -15 -20 Stress (GPa) Strain 4.23 nm 3.55 nm 2.66 nm 2.13 nm Ⅰ Ⅱ Ⅲ Fig. 2 The stress-strain curves of nanocrystalline Fe under compression condition stress decrease with the reduction of mean grain size.
It is possible the grain boundary as a special phase and the function of grain boundary as shear sliding band disappears as the reduction of systematic order degrees resulted in region Ⅰ.
Summary (1) The yield and flow stress of nanocrystalline Fe decrease with reduction of grain size in tension and compression.