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Online since: July 2017
Authors: Ling Hao Kong, Xiao Dong Tan, Dao Ru Li
Introduction Generator is a kind of mechanical equipment that converts other forms of energy.
In the process of curing and heating of stator coil, the curing curve is divided into three sections, one group of heating curing curve showed as Fig.1: Fig. 1 Solidification curve of stator bar Firstly, we analyzed epoxy resin from physical properties [4].
We found three-stage heating curve meets the requirements of the gelling process of epoxy resin: Through the three-stage curve, adverse effects caused by the heating of the epoxy could be lowered to the minimum, also, make the temperature of the bar cold down to the curing temperature slowly; From the analysis of automatic control theory, the set value for ramp function, the overshoot of the system will be greatly reduced, environmental factors, coupling factors such as disturbance of the system will be reduced too, the heating temperature will be coincide with the given temperature better.
Based on the above analysis, the most important processing parameters of generator stator bar are t1, T2, t1, T2 these four parameters, these four parameters directly affect the final processing results of the wire rod.
Analyzing how these two parameters affect bar’s dielectric loss is same as researching how they affect last processing effect.
Online since: December 2011
Authors: Yun Dong Sha, Zhi Jun Gao, Fei Xu
These structures will encounter severe complex loading conditions, which may be a combination of mechanical, aerodynamic, thermal and acoustic loads.
A rectangular Graphite-Epoxy plate of eight layers [0/40/-45/90]s is investigated in this paper, the material properties the of the plate are show in Table 1 Table 1.
Material properties of the composite materials plate 115 8.7 4.55 2.175 1430 0.22 30.1x10-6 A proportional damping ratio with is used.
From the Fig.1 which x axis stands for the displacement of middle point of the panel and the y axis means the full model load proportion factors, The influences of initial imperfection to plate's buckling behaviors are relatively smallest when the ratio of initial imperfection to the plate thickness equal to 50%.
This illustrate that the composite plate's buckling behaviors do not affected by just change the ratio of width to length.
Online since: December 2003
Authors: J.E. Barralet, C. Ansell, David Farrar, K.J. Lilley, Uwe Gbureck
Keywords: Calcium phosphate cement, β-tricalcium phosphate, brushite, mechanical properties Abstract.
Discussion The strength of cement has an inverse exponential relationship to porosity [6] only if all other factors are constant.
Crystal size, degree of reaction and flaw size and /or distribution all affect the strength of cement.
By understanding the nature of the mechanism giving rise to mechanical strength we may engineer optimised formulations with improved performance.
Online since: November 2016
Authors: Koji Hagihara, Haruka Araki, Takaaki Ikenishi, Takayoshi Nakano
This determination is made since only the {013} slip which exhibits significant yield-stress anomaly [20,21] can be operative in the C11b-V1 grains and the Schmid factors associated with other slip systems are negligible at the [001] loading axis [17].
Umakoshi, Mechanical properties of C40-based ternary Mo(Si,Al)2 and quaternary (Mo,Zr)(Si,Al)2 silicides, Scripta Mater. 38 (1998) 471-476
Mishima, Microstructure and mechanical properties of MoSi2/TaSi2 two-phase alloys, Intermetallics 14 (2006) 1358-1363
Nakano, Misfit strain affecting the lamellar microstructure in NbSi2/MoSi2 duplex crystals, Acta Mater. 61 (2013) 3432-3444
Yamaguchi, Microstructure and mechanical properties of MoSi2 single crystals and directionally solidified MoSi2-based alloys, Prog.
Online since: September 2008
Authors: Guggi Kofod
The symmetry properties of these conditions leads to simplifications in the analytical expressions describing the deformation under actuation, and will therefore also simplify the discussion of the influence of the mechanical properties of a material upon actuation properties, which is the topic of this paper.
As discussed by Wissler and Mazza [11], the VHB 4910 material has probably changed its composition since it was first used in 2000 [1], which would affect hyper-elastic properties.
The effects on dielectric properties were also discussed in [11].
The mechanical properties of the electrodes have been disregarded entirely, however, the mechanical response of the electrodes can be boxed with that of the dielectric elastomer into a composite stress-strain behaviour of the actuator as a whole [3].
and 1 are identical apart from a factor '1x .
Online since: June 2014
Authors: Pipatana Amatachaya, Ratipat Sangchot, Bundit Krittacom
Physical properties, i.e., porosity (f), pores per inch (PPI) and thickness (x), of Al-Co open-cellular porous material were 0.87, 13 and 0.103 m, respectively.
The performance of cooling system is governed by several parameters such as radiative properties of porous media, the volumetric heat transfer coefficient between the solid phase and fluid, fluid velocity and irradiation.
Modeling of last four physical properties is summarized in Krittacom [13]. kf and ks are the thermal conductivity of a gas and solid phases, and Tf and Ts are temperature of gas and solid phases, respectively.
The trend of both temperatures was increased along the porous thickness affected from irradiation of the infrared lamps.
Thus, the characteristic of fluid flow effecting to the quantity of HVF and radiation properties of porous material was strongly efficient to transpiration cooling system.
Online since: November 2012
Authors: Hong Jun Liu, Quan Sheng Yan, Shuai Luo
To overcome cable vibration problems, a common practice is to install mechanical damper to connect the cable to the bridge deck, and a number of control methods have been proposed to mitigate cable vibrations.
Fujino and Hoang analyzed the effects of bending on the modal properties of a stay cable with a transverse damper [4].
The current widely used by researchers in the theoretical model assumed that the damper is fixed outside of the deck, and the non-idealized factors such as support flexibility are neglected in the idealized mitigation analysis model, is not reasonable to consider the bridge deck-cable-damper coupled vibration impact caused by the motion of the bridge deck and viscous damper non-idealized characteristics.
Parametric Analysis Parameters such as the anchor location, inclined angle, damping, and stiffness of the damper will affect the mitigation system.
The system modal damping affected by the cable-stayed inclination is another problem need to pay particular attention.
Online since: June 2013
Authors: Hai Xia Li
Its running state often directly affects the overall equipment performance.
(2) Where, is scale factor; the parameter is shift factor.
There is the optimal decomposition level and optimal wavelet basis in signal wavelet analysis on de-noising, take all factors into consideration in de-noising processing in order to get the most realistic signal.
Journal of Mechanical Engineering.2010,46(15):76-81
Journal of Mechanical Engineering,2010,46(2):28-33
Online since: April 2007
Authors: Lan Yi Wang, Cheng Xiang Lu, Guo Yi Tang
All these superior electrical properties are attributed to the CS powder, which makes more uniform do- pant distribution throughout the multilayer ZnO varistors.
The uniformity in the distribution of additives is an important factor to influence the figures of merit of ZnO varistors.
Electrical properties.
It is well known that physical properties of ZnO varistor materials depend strongly on the microstructure, including grain size and boundary characteristics.
The chemical homogeneity of specific dopants and the ceramic micro- structure play an important role in the electrical properties of varistors.
Online since: October 2010
Authors: Jiang Hong Cui, Jian Ru Shi, Jian Fei Chen
Influencing Factor to Super-precision Grinding Quality and Productivity.
The properties of abrasive influence directly the machining accuracy of mechanical product and surface roughness.
Considering synthetically the factors of work materials, abrasive grain and grinding manners and so on, we selected the higher concentration value of 100%, and the hardness of the slipstone is of J-K (soft 3 - in soft).
The size of metamorphic layer on workpiece surface affects seriously the anti-corruptibility and service life of the part [6-7].
Jin: Frontiers of Mechanical Engineering in China Vol.2 (2007), p. 65 [3] E.N.
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