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Online since: July 2017
Authors: Jing Zhao, Shi Jie Wang, Ying Li, Ming Yin Yan
Corrected Computing Method of the Axial Mechanical Force in Transformer Windings
4.1 Influence Factors on the Axial Mechanical Force in Transformer Windings
1.
In addition, because of the influence of the thickness of insulation paper and the elastic coefficient of gaskets on the axial mechanical force Ft, another correction factors are introduced, and.
is adopted by the gasket material property.
In the correction formula, some factors are taken into account, including the correction factor on average radius , the correction factor of paper thickness and the elastic coefficient of gasket .
Two factors that affect the capacity of transformer short-circuit fault.
In addition, because of the influence of the thickness of insulation paper and the elastic coefficient of gaskets on the axial mechanical force Ft, another correction factors are introduced, and.
is adopted by the gasket material property.
In the correction formula, some factors are taken into account, including the correction factor on average radius , the correction factor of paper thickness and the elastic coefficient of gasket .
Two factors that affect the capacity of transformer short-circuit fault.
Online since: September 2011
Authors: Ya Bo Yan, Jun Wang, Yang Zhang, Wei Lei, Wei Qi
Kim et al.[6] investigated the effects of microstructure changes on the mechanical property of bulk bone and they found that the microstructure of cancellous bone played a pivotal role in the material properties of bone.
To further depict the connection between the microstructure and macro-properties, the correlation coefficient was calculated to analyze the architectural parameters and the material properties using regression method[7].
The architectural parameters are affected by many factors and a series of studies have tried to calculate the morphological indices of trabecular bone.
In addition, different shape of volumes of interests may be a factor that affects the parameters due to the anisotropic property of cancellous bone.
H. van Lenthe, et al., "Specimen-specific beam models for fast and accurate prediction of human trabecular bone mechanical properties," Bone, vol. 39, pp. 1182-9, Dec 2006
To further depict the connection between the microstructure and macro-properties, the correlation coefficient was calculated to analyze the architectural parameters and the material properties using regression method[7].
The architectural parameters are affected by many factors and a series of studies have tried to calculate the morphological indices of trabecular bone.
In addition, different shape of volumes of interests may be a factor that affects the parameters due to the anisotropic property of cancellous bone.
H. van Lenthe, et al., "Specimen-specific beam models for fast and accurate prediction of human trabecular bone mechanical properties," Bone, vol. 39, pp. 1182-9, Dec 2006
Online since: February 2013
Authors: Jozef Dobránsky, Luboš Bĕhálek
Thermal conditions between the injection part and the mould or more precisely injection part, mould, machine and surrounding during cooling and injection part solidification are important parameters which influence injection part and mould temperature field and affect the structure and properties of the injection part as well as its surface quality, moulding shrinkage and post-shrinkage [1], anisotropy of properties, residual stress in injection part [2,3] which are results of the interaction of flow and temperature factors and so on.
Nevertheless method DSC is at the enthalpy transformations evaluation greatly influenced by methodical factors mainly by setting beginning and the end of phase transformations which determinate curve surface in the DSC thermogram that is directly proportional to enthalpy.
Experimental analysis of the mechanical properties Injection parts mechanical properties in dependence on the cooling conditions (Table 3) were evaluated on testing samples taken from injection parts bottom (Fig. 5) by determination: yield tensile stress, nominal tensile elongation at yield (loading rate 50 mm/min), flexural stress and modulus (loading rate 1 mm/min).
Testing samples were taken from the injection parts (with regard to anisotropy properties in just one direction) by means of cutting tool and eccentric press.
This fat is positive from the injection parts properties uniformity and also from their shape accuracy point of view.
Nevertheless method DSC is at the enthalpy transformations evaluation greatly influenced by methodical factors mainly by setting beginning and the end of phase transformations which determinate curve surface in the DSC thermogram that is directly proportional to enthalpy.
Experimental analysis of the mechanical properties Injection parts mechanical properties in dependence on the cooling conditions (Table 3) were evaluated on testing samples taken from injection parts bottom (Fig. 5) by determination: yield tensile stress, nominal tensile elongation at yield (loading rate 50 mm/min), flexural stress and modulus (loading rate 1 mm/min).
Testing samples were taken from the injection parts (with regard to anisotropy properties in just one direction) by means of cutting tool and eccentric press.
This fat is positive from the injection parts properties uniformity and also from their shape accuracy point of view.
Online since: May 2006
Authors: Manfred Willfahrt, Georg Berger, Ute Ploska
Improvement of the biological properties of the bioinert implant materials like
Al2O3, ZrO2 or metal implants should be achieved by addition of calcium phosphate particles [4].
Here, the formation of the new phases led to a bulk extension of the sample affecting contrary to the shrinkage and caused a higher porosity, too.
The kind of glass affects the compressive strength.
The solubility of the sintered samples is increased by a factor of 2 compared to FA-CZP.
Bi2O3 or Mg(OCOC2H5)2 were not suitable due to the nullifying the binder properties by reaction with the FA-CZP.
Here, the formation of the new phases led to a bulk extension of the sample affecting contrary to the shrinkage and caused a higher porosity, too.
The kind of glass affects the compressive strength.
The solubility of the sintered samples is increased by a factor of 2 compared to FA-CZP.
Bi2O3 or Mg(OCOC2H5)2 were not suitable due to the nullifying the binder properties by reaction with the FA-CZP.
Online since: October 2016
Authors: Young Suk Kim, Quoc Tuan Pham
Evaluation of Press Formability of Pure Titanium Sheets
Quoc-Tuan PHAM1,a and Young-Suk KIM2,b,*
1Graduate School, Kyungpook National University, Daegu 41566, Republic of Korea
2School of Mechanical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
atuanphamquoc@knu.ac.kr, bcaekim@knu.ac.kr
Keywords: Pure Titanium, Mechanical Properties, Press Formability, Hora’s Modified Maximum Force Criterion.
In this study, the mechanical properties, including the anisotropic property and the stress-strain relation, of the CP Ti sheet are clarified in relation to press formability.
The level of virtual imperfection factors strongly influences the level of the FLC.
Moreover, evaluating the level of imperfections requires experimental results in addition to the usual material properties and it is difficult to ensure accuracy.
Table 4 Plasticity properties of the CP Ti sheet used in Kuwaba's work [22-23] Material σ0 MPa σ45 MPa σ90 MPa R0 R45 R90 Titanium 178 206 225 1.39 2.74 3.91 Comparing the data in Tables 2 and 4, it is undeniable that the material properties of the CP Ti sheet used in Kuwabara's work are almost identical to the material used in the present study in terms of both yield stresses and R-values.
In this study, the mechanical properties, including the anisotropic property and the stress-strain relation, of the CP Ti sheet are clarified in relation to press formability.
The level of virtual imperfection factors strongly influences the level of the FLC.
Moreover, evaluating the level of imperfections requires experimental results in addition to the usual material properties and it is difficult to ensure accuracy.
Table 4 Plasticity properties of the CP Ti sheet used in Kuwaba's work [22-23] Material σ0 MPa σ45 MPa σ90 MPa R0 R45 R90 Titanium 178 206 225 1.39 2.74 3.91 Comparing the data in Tables 2 and 4, it is undeniable that the material properties of the CP Ti sheet used in Kuwabara's work are almost identical to the material used in the present study in terms of both yield stresses and R-values.
Online since: June 2014
Authors: Wei Feng Zhang, Fu Xia Zhang, Li Yan
After replacing the spindle bearings, axis neck needs welding and mechanical processing before assembly.
The initial state analysis: According to the analysis of fracture surface, the crack source occurred in the brittle tissue zone of the surfacing thermal affected area. crack properties Simulation is semielliptical surface crack.
By using the Irwin formula combined with handbook, the maximum stress intensity factor of the position is.
According to the material properties of some materials such as 35CrMo, 45, 30CrMnSiA, 40Cr, etc., fracture toughness is [4].
Table 2 The test results of mechanical properties main mechanical properties σs σb δ Ψ HB standard value [3] ≥835MPa ≥980MPa ≥12% ≥45% ≤ 229 HB spindle 852 1000 13 48 220 2.2 Fatigue Analysis.
The initial state analysis: According to the analysis of fracture surface, the crack source occurred in the brittle tissue zone of the surfacing thermal affected area. crack properties Simulation is semielliptical surface crack.
By using the Irwin formula combined with handbook, the maximum stress intensity factor of the position is.
According to the material properties of some materials such as 35CrMo, 45, 30CrMnSiA, 40Cr, etc., fracture toughness is [4].
Table 2 The test results of mechanical properties main mechanical properties σs σb δ Ψ HB standard value [3] ≥835MPa ≥980MPa ≥12% ≥45% ≤ 229 HB spindle 852 1000 13 48 220 2.2 Fatigue Analysis.
Online since: October 2014
Authors: Wen Ying Zhang, Jian Pu, Fang Zhong Wang, Dao Guang Li
The calcination temperature and the pretreatment of interconnect are considered to be crucial factors affecting the ASR property of LCN CCM for application in stack.
And Cr will also transport to the cathode side and block the electrochemical active sites, which can degrade the property of the cathode and the overall performance of the stack [2].
For a high performance CCM, it should possess the properties as high conductivity, reasonable coefficient of thermal expansion (CTE) with the adjacent materials and good sinterability to ensure high mechanical strength within the CCM layer [5].
Thus ceramic-based material with suitable properties is still the best candidate as CCM.
Calcination temperature can affect the particle size and the compactness of LCN.
And Cr will also transport to the cathode side and block the electrochemical active sites, which can degrade the property of the cathode and the overall performance of the stack [2].
For a high performance CCM, it should possess the properties as high conductivity, reasonable coefficient of thermal expansion (CTE) with the adjacent materials and good sinterability to ensure high mechanical strength within the CCM layer [5].
Thus ceramic-based material with suitable properties is still the best candidate as CCM.
Calcination temperature can affect the particle size and the compactness of LCN.
Online since: January 2012
Authors: Wei Sun, Bao Qiang Wu, Ming Hua Ouyang
And the terrain environment interact with each other is the properties concrete manifestation of a complex terrain mobile robot.
,considerring terrain factors influence are essential.
To deal with the influence of complex terrain conditions on the mobile robot,in the paper, a novel motion modeling idea used in the duct cleaning robot is proposed, which real-timely measures the robot chassis attitude angle changes caused by the topographic changes, and the attitude angle is input into the robot kinematic modeling process, then the end of the position and attitude affected by both of the terrain and robot is got , so as to establish the overall kinematic model of the robot.
Based on this model, robot can achieve effective control in complex environments. 1.Influence analysis of duct cleaning robot model on the complex terrain Duct cleaning robot is a kind of crawler mobile robot used for cleaning the ventilation pipe of central air conditioning,which works long time in complex, varied terrain ventilation pipes.There are slopes, obstacles and other unforeseen factors in the pipes(Fig. 1).Influenced by terrain and obstructions and other factors ,the robot posture changed during the moment,which increased many uncertainty factors for the robot kinematics.
Mechanical Engineering.2008, 44(6),148-154
,considerring terrain factors influence are essential.
To deal with the influence of complex terrain conditions on the mobile robot,in the paper, a novel motion modeling idea used in the duct cleaning robot is proposed, which real-timely measures the robot chassis attitude angle changes caused by the topographic changes, and the attitude angle is input into the robot kinematic modeling process, then the end of the position and attitude affected by both of the terrain and robot is got , so as to establish the overall kinematic model of the robot.
Based on this model, robot can achieve effective control in complex environments. 1.Influence analysis of duct cleaning robot model on the complex terrain Duct cleaning robot is a kind of crawler mobile robot used for cleaning the ventilation pipe of central air conditioning,which works long time in complex, varied terrain ventilation pipes.There are slopes, obstacles and other unforeseen factors in the pipes(Fig. 1).Influenced by terrain and obstructions and other factors ,the robot posture changed during the moment,which increased many uncertainty factors for the robot kinematics.
Mechanical Engineering.2008, 44(6),148-154
Online since: January 2005
Authors: Guo Qing Zhang, Zhou Li, Shi Fan Tian, Yifei Zhang
It has been found that temperature is a major factor that determines the creep properties and
relevant mechanisms of spray formed (SF) superalloy GH742 in its deformed and heat treated fine
grained version.
The creep curves and properties tested and the observations made by TEM were summarized in this paper.
The previous study [1] shows spray formed GH742 has much higher mechanical properties at room temperature than the wrought GH742 alloy.
Hence, further investigation on its mechanical properties at elevated temperature is of significant value.
The alloy's creep properties are excellent at 650�, but deteriorate at 750� Fig. 1 Creep deformation curves Creep Properties.
The creep curves and properties tested and the observations made by TEM were summarized in this paper.
The previous study [1] shows spray formed GH742 has much higher mechanical properties at room temperature than the wrought GH742 alloy.
Hence, further investigation on its mechanical properties at elevated temperature is of significant value.
The alloy's creep properties are excellent at 650�, but deteriorate at 750� Fig. 1 Creep deformation curves Creep Properties.
Online since: January 2009
Authors: Sunita Chauhan, Swandito Swandito, Gerald Gim Lee Seet
Several factors affect the safe operation of a bio-mechatronic system such as design
limitations of the robots to do complex surgical manoeuvres, malfunction of the system's
components, unpredictability of the working envelope to name a few.
Mechanical feasibility tests and in-vitro experimental trials supported the results with a positioning accuracy within 0.5mm.
We used stability based on Lyapunov theory since it is effective to reflect the physical properties of the system [6].
In order to mathematically describe the dynamic properties of FUSBOTBS , classical method from analyses of mechanics and Lagrange equation of motion is used.
Orientation axis Conclusions Reliable system control can improve the safe performance of bio-mechatronic systems besides other factors such as design limitations of the robots to do complex surgical manoeuvres, malfunction of the system's components, unpredictability of the working envelope.
Mechanical feasibility tests and in-vitro experimental trials supported the results with a positioning accuracy within 0.5mm.
We used stability based on Lyapunov theory since it is effective to reflect the physical properties of the system [6].
In order to mathematically describe the dynamic properties of FUSBOTBS , classical method from analyses of mechanics and Lagrange equation of motion is used.
Orientation axis Conclusions Reliable system control can improve the safe performance of bio-mechatronic systems besides other factors such as design limitations of the robots to do complex surgical manoeuvres, malfunction of the system's components, unpredictability of the working envelope.