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Online since: November 2011
Authors: Jian Hua Zu, Min Xia, Fu Xia Shi, Rui Qin Liu
The radiation dose is an important factor to grafting yield, because it directly affects the amount of radicals produced by radiation.
Extortionate radiation dose would cause the degradation of ETFE membranes and influence the mechanical properties such as elongation and tension [4].
Online since: September 2013
Authors: Ge Luo, Chun Mei Yang, Xin Bo Jiang, Quan Hui Wu, Feng Ming Jing
Gantry Beam Stress and Strain Analysis On the gantry beam with ANSYS finite element analysis, you can quickly get accurate results, and easily understand the various parts of the gantry stress state and deformation, this analysis method is widely recognized and the used for the mechanical design, with good technical and economic benefits [2-5].
In the modeling process, removing some elements do not affect the results, such as mounting holes, chamfers, etc., the model was appropriate simplification, ease of finite element analysis.
Since gantry beam is welded assemblies, their model uses SOLID95 unit to mesh freely, shown in Fig. 2, defined material properties is usedQ235 (plain carbon steel), the corresponding parameter is the elastic modulus E = 2.06E5MPa, Poisson's ratio μ = 0.3, density ρ = 7850 Kg/m³.
(2) Stress Analysis: Material failure is caused by a lack of strength, the material of the gantry beam is used steel Q235, safety factor of the strength of the material is taken 1.48 by empirical data, the yield limit of 235MPa, so the maximum allowable stress is = 160MPa, from Fig. 5-12 gantry beam stress cloud it can be seen that the maximum stress value of the gantry beam is 2.643MPa, less than the allowable stress 160MPa, therefore, intensity of damage of the gantry beam does not occur, meeting the strength requirements .
Online since: December 2013
Authors: Jing Zhang, Hui Li
Introduction Many engineering structures are affected by undesirable vibrations [1].
There are a number of ways to achieve the QZS property.
In [7], QZS property is achieved by combining positive and negative stiffness, and negative stiffness is obtained by a compressed rod.
In fact, the leakage flux, reluctance and the operating point of the dispersion and so on have to be considered in order to obtain a correction factor for practical utilization.
Shin, On the design of a high-static-low-dynamic stiffness isolator using linear mechanical springs and magnets, Journal of Sound and Vibration Vol. 315 (2008), p. 712-720
Online since: July 2011
Authors: Guo Wei, Peng Fei Zhang, Xun Jin, Xing Wu Long
Bias of ring laser gyro (RLG) changes with temperature in the non-linear way, which is an important restraining factor for improving the accuracy of RLG.
Temperature characteristics and test of RLG’s bias Temperature mainly impacts RLG’s bias from the following aspects: in terms of heat source, the gyro fevers in working and needs several hours to reach equilibrium, in addition, the temperature field will change more complex when ambient temperature and other conditions change, so the change of both gyro’s own temperature and ambient temperature will affect the performance of the gyro; in terms of physical properties, refractive index of gas, thermal conductivity of materials, optical properties of optical devices will change; in terms of geometrical characteristic, the device’s expansion and contraction, bending can result in optical changes and the increasing loss of resonant system; finally, the change of temperature field causes gas flow’s change, which results in the imbalance of discharge current of two arms, and exacerbates the change of bias that brought by Langmuir effect.
These changes will all affect the output of RLG.
Measurement data at all temperature spots of a certain type mechanical dithered RLG in the experiment is shown as Table 1.
Online since: October 2011
Authors: Ying Guang Fang, Bo Wu, Zong Xue Yan
According to the mechanical parameters in table 1, maximum tension strain of this surrounding rock was set at 0.5‰.
Table 1 Mechanical parameter of rock Rock grade Weight γ(kN/m3) shear modulus(GPa) Poisson ratioμ cohesive strength c/KPa internal friction angle / ° V 20 1.875 0.333 500 32 The scale of laxity area on surrounding rock is the key factor affecting surrounding rock load.
[12]GENG Luanfeng,Analysis of mechanical properties of full section excavation of single arch four-lane highway tunnel[J], Shanxi Architecture,2009.2
Online since: June 2011
Authors: Shen Yung Lin, C.T. Chung, Y.Y. Cheng
Under high-temperature situation, titanium alloy can well maintain its favorable mechanical properties, while the strength of titanium alloy may increase and its toughness can be well preserved as lowering temperature below normal.
Hong et al. [6] reviewed how the temperature affects Ti-6Al-4V properties, and compared different cryogenic cooling strategies.
RELATED THEORY 2.1 Material properties of titanium alloy Titanium alloys possess the advantages of good strength-to-weight ratio, superior corrosion resistance, reliable properties at low and high temperatures, sound toughness and fatigue endurance, thereby they have been widely used in the aerospace, biomedical, automotive and motorcycle, petroleum, daily living substance consumption, and sport and leisure equipment industries etc.
Furthermore, the results reveal that the main factor affecting surface roughness is the feed rate.
This is strongly affected by depth of cut.
Online since: September 2016
Authors: Hamza Samouh, Emmanuel Roziere, Ahmed Loukili
The hydric properties of this zone can be assumed to be different from the inner concrete, with a higher porosity and higher permeability.
For these reasons scientists have studied the influence of specimen size on several properties of concrete and among them drying shrinkage.
Thus, the largest specimen was relatively less affected by the drying depth and its kinetics of drying were slower.
The depth was actually not affected by specimen size
Kreijger, “The skin of concrete Composition and properties,” Mater.
Online since: July 2015
Authors: Kil To Chong, Deok Jin Lee, Felipe P. Vista IV
Screen capture of the FIS system done in MatLab (Fig. 1) shows the general properties of the FIS as well as its individual components (inputs and output).
(a) General property of the FIS (b) Properties for input “Fix” (c) Properties for input “HDOP” (d) Properties for output (e) Rules for evaluating the individual GPS Figure 1.
Fuzzy Inference System for evaluating and classifying one GPS data based on Ad-Hoc Weighing The second FIS was designed to derive the weight for the overall fused heading value (a) General property of the FIS (b) Properties for input “Fix of GPS#1” (c) Properties for output “bigat1” (d) Rules for the MultiGPS FIS Figure 2.
The general properties of this FIS as well as its particular properties are shown in Fig. 2.
The U-blox GPS is not affected by the Magellan GPS, IMU or EC.
Online since: February 2011
Authors: Chun Yi Cui, Shou Long Chen
And the mechanical properties of soil are given in Table 2.
In fact, the distribution of pore-water pressure is an important factor in affecting directly the distribution of effective stress and deformation of soils.
Online since: July 2006
Authors: Shao Hui Lai, Xin Wei, Z.H. Xie, Rui Wei Huang
The cutting performance of a blade depends on its stiffness and the inner edge roundness, and affects greatly the surface quality and machined accuracy of the sliced wafers.
Table 1 Properties of ID blade and slicing parameters Descriptions Parameters Outer diameter [mm] 422 Inner diameter [mm] 153 Thickness of blade [mm] 0.12 Width of diamond layer [mm] 2.5 Thickness of diamond layer [mm] 0.29 ID blade Diamond grit size [µm] 60-80 Diameter [mm] 32, 40, 52, 65, 76, 85 Ingot size Length [mm] 200 Spindle rotation n [rpm] 1800 Feed speed vf [mm/min] 30, 40, 50, 60, 70 Fig.1 Experimental set-up for deflection and vibration signals measurement Results and Discussion Vibration Signals in the Blade Working Life.
As shown in Fig.6, the feed speed affects the slicing processes obviously.
In ID slicing process, the warp of the wafer is an important factor, which would make the blade easily to scrape the wafer or ingot especially at a certain depth of cut, and so induce the vibration in the blade [4], especially the axial vibration or deflection.
Jiang and Y.Yuki: Journal of Mechanical Design, Vol.115 (1993), pp.711
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