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Online since: March 2011
Authors: H.L. Zhao, Fang Yan, Ji Peng Liu
It involves too many human factors, and can not show the real effects satisfactorily.
If using the visualization computing, we input the sleeve, the steel bar physical property, and mechanics characteristic in the computer and establish model, we may see the different models of sleeve and steel bar under different pressure extrusion situations on the computer screen.
This may cause doing over, and also affect the building decoration effect.
After fully considering every kind of construction influence factors, we can establish construction system mathematics logical model, and develop suitable software based on the model.
Then we may obtain the most superior construction mechanical device necessary plan and the machinery use rate, formulate reasonable construction progress plan and construction organization plan, and grasp constructs the entire process perfectly, fleetly, and accurately.
If using the visualization computing, we input the sleeve, the steel bar physical property, and mechanics characteristic in the computer and establish model, we may see the different models of sleeve and steel bar under different pressure extrusion situations on the computer screen.
This may cause doing over, and also affect the building decoration effect.
After fully considering every kind of construction influence factors, we can establish construction system mathematics logical model, and develop suitable software based on the model.
Then we may obtain the most superior construction mechanical device necessary plan and the machinery use rate, formulate reasonable construction progress plan and construction organization plan, and grasp constructs the entire process perfectly, fleetly, and accurately.
Online since: September 2011
Authors: Xiao Ming Yuan, Rui Sun, Yong Zhi Wang
With large centrifugal shakers, the dynamic property and failure mechanism of soil mass and geotechnical structures can be more truly reappeared under the same gravity stress level as prototype.
Moreover their mechanical structure and laboratory structure possess their special characteristic and form.
The hoisting mouth of the operation hall should fully consider the pressure factor when the centrifuge is running, its cove plate is fastened from inside.
This situation seriously affects the normal work of equipment, for example, sensitivities of test sensors may have a significant change resulting in distortion of test results, changes in the resistance of controlled circuits may lead to control equipment unserviceable, with consequences disastrous beyond imagination.
However, in the process of vibration test, vibration of shaker, failure of model and other factors may generate a great instantaneous imbalance force, and such force must be taken fully into account in foundation design.
Moreover their mechanical structure and laboratory structure possess their special characteristic and form.
The hoisting mouth of the operation hall should fully consider the pressure factor when the centrifuge is running, its cove plate is fastened from inside.
This situation seriously affects the normal work of equipment, for example, sensitivities of test sensors may have a significant change resulting in distortion of test results, changes in the resistance of controlled circuits may lead to control equipment unserviceable, with consequences disastrous beyond imagination.
However, in the process of vibration test, vibration of shaker, failure of model and other factors may generate a great instantaneous imbalance force, and such force must be taken fully into account in foundation design.
Online since: December 2015
Authors: Zhao Gang, Mazhar Ul Haq, S.M. Aftab, Zhuang Zhi Sun
IPMC actuators, also known as artificial muscles, possess extraordinary properties such as low efficiency consumption, compliance, bio-compatibility and ability to be miniaturized.
Here the solid bodies; wing and fin are suppressed and only fluid bodies are meshed with the following properties: solver preference CFX, use advanced size function (off), smoothing (medium), transition (slow), and span angle center (fine).
We specify mesh behavior option of soft which means that the size control will be affected by proximity, curvature, and local remeshing during the meshing process.
Bias factor is used to define the ratio of largest edge to the smallest edge.
Mechanical properties of a bio-inspired robotic knifefish with an undulatory propulsor.
Here the solid bodies; wing and fin are suppressed and only fluid bodies are meshed with the following properties: solver preference CFX, use advanced size function (off), smoothing (medium), transition (slow), and span angle center (fine).
We specify mesh behavior option of soft which means that the size control will be affected by proximity, curvature, and local remeshing during the meshing process.
Bias factor is used to define the ratio of largest edge to the smallest edge.
Mechanical properties of a bio-inspired robotic knifefish with an undulatory propulsor.
Online since: June 2018
Authors: Volodymyr Falshtynskyi, Roman Dichkovskiy, Pavlo Saik, Vasyl Lozynskyi
Because, as we know from the experimental stations experience, the geological factor mainly affected the efficiency of the thermochemical reactions, flowing in the process of gasification [9].
Tectonics of the Lvivskyi basin is affected by the higher grades faultings.
To compose mass balance it is necessary to know the proximate and ultimate analysis of coal, some physical and physico-chemical properties of raw materials, wastes, main and by-product.
Deformation properties of sedimentary rocks in the process of underground coal gasification.
The influence of fine particles of binding materials on the strength properties of hardening backfill.
Tectonics of the Lvivskyi basin is affected by the higher grades faultings.
To compose mass balance it is necessary to know the proximate and ultimate analysis of coal, some physical and physico-chemical properties of raw materials, wastes, main and by-product.
Deformation properties of sedimentary rocks in the process of underground coal gasification.
The influence of fine particles of binding materials on the strength properties of hardening backfill.
Online since: February 2020
Authors: L.G. Marques, Bruno R.S. Silva, Marcelo Nascimento, Manoel Marcelo Prado
Some mean physical properties of the polypropylene and bagasse particles are listed in Table 1.
Physical properties of the biomass and inert particles used Material dp [mm] rs [kg/m3] rb [kg/m3] polypropylene 3.45 900.9 549.4 bagasse 3.15 1450.2 148.8 Based on the properties listed in Table 1, it can be concluded that both the particles belong to the group D of Geldart and, therefore, are able to produce spouting regimes when subjected to the gas flow.
Figure 3 displays the response surface obtained for the drying time as a function of air temperature and biomass composition in the mixture, which were the factors that influenced statistically the response variable.
Although drying time is negatively affected by bagasse composition in the mixture, the higher the biomass volume fraction the higher the energy balance.
As the drying time was not affected by the Q/Qms ratio, a lower air flow rate helps to increase the energy gain, because the power consumption of the air compressor is reduced.
Physical properties of the biomass and inert particles used Material dp [mm] rs [kg/m3] rb [kg/m3] polypropylene 3.45 900.9 549.4 bagasse 3.15 1450.2 148.8 Based on the properties listed in Table 1, it can be concluded that both the particles belong to the group D of Geldart and, therefore, are able to produce spouting regimes when subjected to the gas flow.
Figure 3 displays the response surface obtained for the drying time as a function of air temperature and biomass composition in the mixture, which were the factors that influenced statistically the response variable.
Although drying time is negatively affected by bagasse composition in the mixture, the higher the biomass volume fraction the higher the energy balance.
As the drying time was not affected by the Q/Qms ratio, a lower air flow rate helps to increase the energy gain, because the power consumption of the air compressor is reduced.
Online since: October 2016
Authors: Tobias Lieske, Denis Shuklin, Daniel Hohnloser, Marc Reichenbach, Benjamin Pfundt, Dietmar Fey, Robert Weigel
The integration leads to a smaller overall footprint and reduced
power consumption, which positively affects the acceptance rate of distributed smart sensor networks
for home automation.
For this task a low-power third party radio frequency (RF) module intellectual property (IP) block will be used.
For this process, the material properties play an important role.
The oversampling factor was set to 512 resulting in clock frequency of 1024 KHz with the input signal bandwidth of 1 kHz.
The integrator capacitors were sized according to maximum permitted noise in-band power (resulting from aforementioned SNR requirement) and calculated coefficients of integrator gain factors.
For this task a low-power third party radio frequency (RF) module intellectual property (IP) block will be used.
For this process, the material properties play an important role.
The oversampling factor was set to 512 resulting in clock frequency of 1024 KHz with the input signal bandwidth of 1 kHz.
The integrator capacitors were sized according to maximum permitted noise in-band power (resulting from aforementioned SNR requirement) and calculated coefficients of integrator gain factors.
Online since: October 2013
Authors: Marcin Amarowicz, Paweł Chrzanowski, Tomasz Rogala, Wojciech Cholewa
It concerns knowledge that was pre-defined by domain experts (that affect complex object diagnostics) or processes for which the development of numerical diagnostic models and object models is not sufficient or possible.
The uncertainty can occur due to various factors that influence the results of data acquisition process.
The main factors can be · irrelevant data (insufficiently dependent on the state of the object), · approximate data (expressed in a qualitative manner), · contradictory data (distinct opinions of specialists), · inaccurate data (measurement errors), · incomplete data, · incomprehensible (expressed in an ambiguous manner).
Research on this particular subject has showed that constructing complex statements of an excessive number of variants does not lead to obtaining better reasoning results but increasing the number of necessary parameters, e.g. the size of conditional probability tables used with belief networks which worsens generic properties of such models.
Developing an unequivocal and semantically consistent knowledge base is one of the most important stages in the diagnostic system design process and one that affects the system efficiency.
The uncertainty can occur due to various factors that influence the results of data acquisition process.
The main factors can be · irrelevant data (insufficiently dependent on the state of the object), · approximate data (expressed in a qualitative manner), · contradictory data (distinct opinions of specialists), · inaccurate data (measurement errors), · incomplete data, · incomprehensible (expressed in an ambiguous manner).
Research on this particular subject has showed that constructing complex statements of an excessive number of variants does not lead to obtaining better reasoning results but increasing the number of necessary parameters, e.g. the size of conditional probability tables used with belief networks which worsens generic properties of such models.
Developing an unequivocal and semantically consistent knowledge base is one of the most important stages in the diagnostic system design process and one that affects the system efficiency.
Online since: August 2013
Authors: Zheng Tao Yan, Wen Wu Liu, Hai Feng Li
Pump group of floating raft frame vibration isolation system belongs to hang-floating valve gear the whole system is composed of hexahedral seven-vibration isolator, raft frame and equipment which including three accumulators, two hydraulic pumps, two cooling water pumps, and one centrifugal pump, one bilge pump, distilled one water pump, one dry pump, one auxiliary cooling pump, ice mechanical and one electrical motor.
Passive Vibration Isolation, New York: The American Society of Mechanical Engineers, 2003
Study on Friction and Wear Property and Lubricant Mechanism of Water Lubricated Bearing, PhD Dissertation, Chongqing University, China, 2003
[4] Mars W V,Fatemi A.Factors that affect the fatigue life of rubber:a literature survey.Rubber Chemistry and Technology.2004,77(3):391-412
Passive Vibration Isolation, New York: The American Society of Mechanical Engineers, 2003
Study on Friction and Wear Property and Lubricant Mechanism of Water Lubricated Bearing, PhD Dissertation, Chongqing University, China, 2003
[4] Mars W V,Fatemi A.Factors that affect the fatigue life of rubber:a literature survey.Rubber Chemistry and Technology.2004,77(3):391-412
Online since: May 2024
Authors: Bouraida El Yamouni, Fadoua El Khannoussi, Abdellatif Khamlichi
Importantly, the findings revealed a significant impact resulting from cohesion, affecting both the profile and magnitude of earth pressure acting on the retaining wall under dynamic excitation.
Constitutive laws and material properties The foundation and backfill soils are assumed to behave according to the constitutive law termed: the Hardening Soil model with Small-strain Stiffness (HSsmall) [9,24].
Table 1 summarises the mechanical and geometric parameters of the wall/soil system.
The properties of coupling elements are deduced from the parameters of the adjacent soil.
The objective pursued is to assess the synergetic influence of these factors on the seismic response of the coupled wall-soil system.
Constitutive laws and material properties The foundation and backfill soils are assumed to behave according to the constitutive law termed: the Hardening Soil model with Small-strain Stiffness (HSsmall) [9,24].
Table 1 summarises the mechanical and geometric parameters of the wall/soil system.
The properties of coupling elements are deduced from the parameters of the adjacent soil.
The objective pursued is to assess the synergetic influence of these factors on the seismic response of the coupled wall-soil system.
Online since: April 2022
Authors: Mufutau Akindoye Waheed, Olalekan Olaoluwa Olamide, Olusegun Balogun, Lateef Olaitan, Sidikat Kuye
By utilizing a fluid with enhanced thermophysical properties such as nanofluids, some of the highlighted problems are remedied [11].
The Reynolds numbers of the flow and tube arrangements are critical factors that influences both heat transfer coefficient and pressure drop.
The cold fluid is homogenous and has constant properties.
Nanofluid Effective Properties.
The nanoparticle fluid properties defined in Eqs. 16 – 21 are used in the flow governing Eqs. 1 – 4 and the prescribed boundary conditions.
The Reynolds numbers of the flow and tube arrangements are critical factors that influences both heat transfer coefficient and pressure drop.
The cold fluid is homogenous and has constant properties.
Nanofluid Effective Properties.
The nanoparticle fluid properties defined in Eqs. 16 – 21 are used in the flow governing Eqs. 1 – 4 and the prescribed boundary conditions.