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Online since: October 2015
Authors: Yuan Zheng, Xin Zhang, Zheng Yang Zhang
It shows us that the numerical simulation results and experimental results had a good fit.This shows that the entire axial pump flow field numerical simulation results are with high accuracy,it also provided a relatively reliable data to support prestressing load on the wheel later.
2.2 Impeller structure domain calculation
The impeller is the core component of the axial pump,its performance will directly determine the quality of the axial pump running.So modeling calculation of axial flow impeller is crucial.As used herein, the impeller material is structural steel,modulus of elasticity is 200, density is 7850, the Poisson's ratio is 0.3, yield strength is 250,tensile strength is 460.
2.2.1 Impeller modeling and meshing
Here is the figure 3,runner model was established in UG,than it was imported in ANSYS,and axial flow runner had been divided by ANSYS WORKBENCH meshing tools.The number of the grid in runner is 197194, and the number of nodes is 286782.
First three vibration mode of the prestressed impeller in water Table 2 and Fig 7 show that the natural frequency of impeller in the water and it as compared to the air, has a very significant decrease in the case of prestressed.Vibration of water points can be caused by the impeller system,the system energy radiated,meanwhile structural natural frequency drops.And a reduction in the frequency of each order are not the same,a decline ranging from 5.2% to 29.6%.The amplitude is also reduced by the damping effect caused by water. 4 Conclusion 1.Vast majority of orders natural frequency after loading prestressed had no significant change through a one-way coupling method, the structure itself did not appear obvious stress stiffening, inertia force of structure and the force of water bodies for the impeller did not affect the natural frequency on the whole 2.significant damping effect of the aqueous medium for the entire axial flow rotor structure was found by the method of APDL command
First three vibration mode of the prestressed impeller in water Table 2 and Fig 7 show that the natural frequency of impeller in the water and it as compared to the air, has a very significant decrease in the case of prestressed.Vibration of water points can be caused by the impeller system,the system energy radiated,meanwhile structural natural frequency drops.And a reduction in the frequency of each order are not the same,a decline ranging from 5.2% to 29.6%.The amplitude is also reduced by the damping effect caused by water. 4 Conclusion 1.Vast majority of orders natural frequency after loading prestressed had no significant change through a one-way coupling method, the structure itself did not appear obvious stress stiffening, inertia force of structure and the force of water bodies for the impeller did not affect the natural frequency on the whole 2.significant damping effect of the aqueous medium for the entire axial flow rotor structure was found by the method of APDL command
Online since: September 2007
Authors: Yoon Suk Chang, Jae Boong Choi, Sang Min Lee, Young Jin Kim, Dae Geun Cho, Poong Hwan Chun, Jae Youn Kong
With
regard to this situation, reduction of defective articles and moving technologies during the production
process become critical issues.
The resulting analysis data are investigated to characterize near field flows under below the FPD.
The resulting analysis data are investigated to characterize near field flows under below the FPD.
Online since: October 2006
Authors: Moo Young Huh, Han Gil Suk, E.J. Shin
The hot band was cold
rolled to a thickness of 1.0 mm, corresponding to the thickness reduction of 85%.
Note that the volume fractions of the particles are derived with the data for pure aluminum because the exact composition of the particles is not known.
Note that the volume fractions of the particles are derived with the data for pure aluminum because the exact composition of the particles is not known.
Online since: August 2004
Authors: Yoshihiko Imanaka, Masatoshi Takenouchi, Jun Akedo
Japan
Fax: 81-298-61-7091, e-mail: akedo-j@aist.go.jp
Keywords: Aerosol deposition (AD) method, Microwave filter, Ba(Zn1/3Ta2/3)O3, LTCC, Room temperature,
Q value, 20 GHz
ABSTRACT
Integrating and embedding various passive components like a resistor, a capacitor, and an
inductor, in one system module, is one of the attractive way to achieve down-sizing, cost-reduction
and higher performance in RF wireless communication products such as a cellular phone, a personal
digital assistance (PDA) and so on.
The expected application is short-range and high-speed wireless LAN for transmitting large information data such as Hotspot.
The expected application is short-range and high-speed wireless LAN for transmitting large information data such as Hotspot.
Online since: July 2013
Authors: Hai Feng Zhang, Xiao Wei Liu, Hai Li, Nan Chen, Yi Bo Fu
With the reduction of the electrode spacing and the increase of the surface roughness, the local conditions on the electric field become unknown.
The roughness data can also be obtained experimentally to measure the actual electrode sample.
The roughness data can also be obtained experimentally to measure the actual electrode sample.
Online since: August 2014
Authors: Kalyan Sundaram, Rahul G. Gore, Atul Joshi
No
Model Name
Model image
Description
1
Basic Shape
Basic shape made from wooden pattern machined as per data points given by IS4151
2
Mark Model
By sectioning Basic shape at various locations the Mark models are manufactured
3
Track 1 Model
Square wooden pattern of 110×240×200 mm Manufactured and FRP models are layered around its surface.
Weighing 650 grams 4 Track 2 Model Track 2 models with storage height of 170mm are manufactured in FRP and tested.EPS inside is manually cut from the EPS block .Novelty helmet with folding side flaps weighing 850 grams Impact absorption testing Fig.3 shows Track1 type of helmets are tested on test rig in which the impact hammer falls on helmet mounted on stationary head form, however this does not exactly simulate the actual accidental situation in most of the cases but it gives guidelines for using EPS padding of less than 27 mm for a helmet and it also gives the indication that helmet shell shape should be curved and not square though it gives excellent space reduction.
Weighing 650 grams 4 Track 2 Model Track 2 models with storage height of 170mm are manufactured in FRP and tested.EPS inside is manually cut from the EPS block .Novelty helmet with folding side flaps weighing 850 grams Impact absorption testing Fig.3 shows Track1 type of helmets are tested on test rig in which the impact hammer falls on helmet mounted on stationary head form, however this does not exactly simulate the actual accidental situation in most of the cases but it gives guidelines for using EPS padding of less than 27 mm for a helmet and it also gives the indication that helmet shell shape should be curved and not square though it gives excellent space reduction.
Online since: August 2013
Authors: Xin Feng Yin, Shi Hui Guo, Yin Zhang
An immediate advantage of using an FRP deck to replace a deteriorated concrete deck is a reduction of the superstructure dead load which results in an increase in the allowable live load capacity.
Mechanical Vibration –Road Surface Profiles-Reporting of Measured Data, 1995, TC108/SC2, ISO, Switzerland.
Mechanical Vibration –Road Surface Profiles-Reporting of Measured Data, 1995, TC108/SC2, ISO, Switzerland.
Online since: September 2015
Authors: Yermek Sarsikeyev, Raissa Mustafina, Boris Lukutin
The overloading beyond these limits leads to life reduction of the diesel engine.
These data are averaged and can be used for a rough estimation of the damage in case of accidental interruption of electric power supply in the mains with a different composition of consumers.
These data are averaged and can be used for a rough estimation of the damage in case of accidental interruption of electric power supply in the mains with a different composition of consumers.
Online since: May 2012
Authors: Qing He Chu, Wei Hua Li, Chun Hua Sun
Load distribution results
Total
Out-
put
The optimization results data
Such output allocation
Total flow
Unit 1
Unit 2
Unit 3
Out-
put
Flow
Out-
put
Flow
Out-
put
Flow
Single output
Single flow
Combined flow
10
203.999
3.900
78.696
2.330
49.330
3.740
75.9675
3.3333
68.946
206.840
14
277.934
4.749
94.280
4.515
89.776
4.728
93.877
4.667
92.681
278.040
18
357.785
7.410
147.610
5.180
103.000
5.383
107.165
6.000
120.297
360.900
22
438.600
7.416
147.720
7.168
143.600
7.388
147.282
7.3333
146.392
439.180
Form the table1, it is obviously known that: ① when the total output was 10, 18MW, the three units total flow respectively is 203.999, 357.785after optimization, compared to the total flow of equivalent distribution, the optimized water consumption decrease respectively 2.840, 3.116, 1.37%, it is about 1.37%, 0.86% lower. ② With the total output increases, when assigned to each unit of output is close to its maximum capacity, optimizing effect will be reduced stage by stage.
When the total output is 22MW, the optimized water consumption reduced by 0.580, 0.13% relative reduction.
When the total output is 22MW, the optimized water consumption reduced by 0.580, 0.13% relative reduction.