
text
article
2010
per

Sharif Journal of Mechanical Engineering
Sharif University of Technology
26764725
دوره 25
v.
51.2
no.
2010
1
1
http://sjme.journals.sharif.edu/article_6426_0d15c06e85f2efe4fabeca4aae9aa94c.pdf

text
article
2010
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Sharif Journal of Mechanical Engineering
Sharif University of Technology
26764725
دوره 25
v.
51.2
no.
2010
2
2
http://sjme.journals.sharif.edu/article_6425_359dc5eb7ec9e2e1412fb9b23aab42e6.pdf
PREDICTION OF GLOBAL SOLAR RADIATION IN KERMAN USING GEOMETRICAL, ASTRONOMICAL, GEOGRAPHICAL AND
METEOROLOGICAL PARAMETERS
M. H.
Safaripour
Dept. of Mechanical Engineering Shahid Bahonar University
author
M.A.
Mehrabyan
Dept. of Mechanical Engineering
Shahid Bahonar University
author
text
article
2010
per
In this research, the monthly mean daily global solar radiation in Kerman was predicted, using geographical, geometrical, astronomical and meteorological parameters. The measured data of global solar radiation, obtained from the Iranian Meteorological Organization (IMO), were used and the predicted results were compared against them. The analysis of measured data
showed that the monthly mean daily global solar radiation on a horizontal surface is correlated with seven geographical and meteorological variables. The above variables were incorporated in a multiple regression relation predicting monthly mean daily global solar radiation on a horizontal surface. The global solar radiation model developed in this research, whose accuracy
was validated when compared to measured data, can be used in regions where meteorological stations are not available and, therefore, where measured data do not exist. In this case, using the model requires only to know the seven parameters mentioned above, the measuring of which does not require a meteorological station.
Sharif Journal of Mechanical Engineering
Sharif University of Technology
26764725
دوره 25
v.
51.2
no.
2010
3
13
http://sjme.journals.sharif.edu/article_5621_c2a8cee536cfcf7f77d639267df8d4d7.pdf
INVESTIGATION OF THE NONLINEAR VIBRATION OF A CABLE MASS SYSTEM, DUE TO THE MOTION OF AN ATTACHED ACCELERATING MASS
A.R
shahani
Dept. of Mechanical Engineering K.N.Toosi University of Technology
author
M.
Ghadiri
Dept. of Mechanical Engineering K.N.Toosi University of Technology
author
text
article
2010
per
In this article nonlinear vibrations moving mass of the cable carrier via spring and damper connected to cable, has been studied. A cable end fixed and the other end, with the height difference, is Ghyrsabt. Tangential strain is zero cable, but cable length is constantly changing and this change over cable, it will allow vibration. This changes the difference Bhgvnhyy nonconstant tension cable in the end is zero. Cable vibrations Drvnsfhhyy form intended, and assumes that only the mass moving along $ y $ will fluctuate. Extract formulation in motion, friction force between the rollers and cables and a power line Jlvbrndh that the tangent line is considered the cable, and the equations of motion is being influenced by the motion of the moving mass of cables is obtained. To solve, Galrkyn method in place and sphere of the average acceleration method in time domain is used. The results of the nonlinear vibration equations cable vibration with the results of linear equations that has been compared. Results in analysis and design Tlhkabynha cable, cable cranes, etc.
Sharif Journal of Mechanical Engineering
Sharif University of Technology
26764725
دوره 25
v.
51.2
no.
2010
15
23
http://sjme.journals.sharif.edu/article_5622_b908870ec15fe7639e0c2b875eae3b49.pdf
NUMERICAL SOLUTION OF CONJUGATE MIXED CONVECTION AND RADIATION IN A HORIZONTAL ELECTRONIC BOARD
WITH RECTANGULAR HEAT SOURCES
Ali
Behbahaninia
Dept. of Mechanical Engineering K. N. Toosi University of Technology
author
M.
Ghasemi
Dept. of Mechanical Engineering K. N. Toosi University of Technology
author
M. R.
Shirzadi
Dept. of Mechanical Engineering K. N. Toosi University of Technology
author
text
article
2010
per
The numerical solution of cooling air in a horizontal electronic board containing five chips as heat sources is presented. Heat transfer in air is considered as mixed laminar and steady and 2D convection and, in the solid domain, is considered as combined conduction and radiation. Governing equations are discretised by the FV method, radiation heat transfer is modeled with the radiossity/ irradiation method and Hottel's crossedstring method is used to evaluate view factors. A comparison between obtained numerical results and existing numerical and experimental results is made and shows the good accuracy of the numerical code. The effect of Reynolds number, Grashof number, aspect ratio and the distance between heat sources and their location, on the hydrodynamic and heat transfer behavior of electronic equipment, is investigated. According to obtained results, the aspect ratio has a considerable effect on the maximum temperature in electronic equipment and, whenever there is a limitation to selecting materials in the thermal designing of electronic equipment, a proper geometrical arrangement can be very useful.
Sharif Journal of Mechanical Engineering
Sharif University of Technology
26764725
دوره 25
v.
51.2
no.
2010
25
32
http://sjme.journals.sharif.edu/article_5623_b8947f21eff7d25b30f9ebad3a9f7de0.pdf
INVESTIGATING THE EFFECTS OF USING PIEZOELECTRIC LAYERS ON THE FREE AND FORCED VIBRATIONS OF FGM PLATES
M.
Shariyat
Dept. of Mechanical Engineering K.N.Toosi University
author
I.
Aminaee
Dept. of Mechanical Engineering K.N.Toosi University
author
text
article
2010
per
In the present paper, the effects of using piezoelectric sensor and actuator layers on the vibration of FGM plates are investigated. In this regard, free vibration, forced vibration and active control of the transient vibration are studied. In the free vibration analysis, natural frequencies and mode shapes are determined. In the forced vibration analysis, the responses of the system are obtained for different inputs and different electric potential fields. The finite element method is employed to solve the governing equations. It is noticed that the piezoelectric layer has minor effects on the natural frequencies and no effect on the mode shapes. Instead, sensor and actuator piezoelectric layers may be used in active control of the transient vibrations of the systems without performing any modifications on the vibration parameters.
Sharif Journal of Mechanical Engineering
Sharif University of Technology
26764725
دوره 25
v.
51.2
no.
2010
33
41
http://sjme.journals.sharif.edu/article_5624_032db12bfe6d498143bdda4a45fcbb3c.pdf
APPLICATION OF RETURN MAPPING ALGORITHM IN ANALYSIS OF PRESSURE VESSELS WITH NONLINEAR KINEMATIC HARDENING BEHAVIOR
A.
Nayebi
Dept. of Mechanical Engineering Shiraz University
author
K.
Naderan Tahan
Dept. of Mechanical Engineering Shahid Chamran University of Ahvaz
author
S.
Bazdar
Dept. of Mechanical Engineering Shahid Chamran University of Ahvaz
author
text
article
2010
per
Stress  strain analysis of pressure vessels has an important role in their design. The choice of the numerical method is very importand in elastoplastic analysis. Return mapping algorithm is a powerful numerical method in the elasticplastic analysis of nonlinear problems which consists of two steps of elastic predictor and plastic corrector. In this research, the return mapping algorithm is developed to analyze a thick cylinder under internal cyclic pressure. The material behavior is considered to be nonlinear kinematic hardening and the yield criterion is the VonMises function. Variation of the radial and tangential stresses and strains were obtained. The results obtained by this algorithm are com pared to those obtained by nite element method and a good agreement is observed.
Sharif Journal of Mechanical Engineering
Sharif University of Technology
26764725
دوره 25
v.
51.2
no.
2010
43
48
http://sjme.journals.sharif.edu/article_5625_43fd437a9f166239b31db9ae1c349187.pdf
NUMERICAL STUDY OF PULSATING FLOW AND HEAT TRANSFER IN A PIPE PARTIALLY FILLED WITH A POROUS MEDIUM
Habib l ...
Sayhvand
Dept. of Mechanical Engineering BuAli Sina University, Hamedan
author
H.
Shokouhmand
Faculty of Engineerin Dept. of Mechanical Engineerin University of Tehran
author
text
article
2010
per
The objective of the present work is to perform a detailed numerical study of pulsating flow and heat transfer characteristics in a pipe partially filled with a porous medium. The BrinkmanForchheimerextended Darcy model is adopted for the porous matrix region, which is attached at the pipe wall and extends inward, toward the centerline. The effects of the Darcy number, Da, the thickness of the porous layer, S, and the thermal conductivity ratio, Rk, as well as the pulsating frequency and the amplitude, are investigated. The results showed that as the thickness of the porous layer increases or the Darcy number decreases, the pressure drop grows. It was found that the dependence of the Nusselt number, v, on S is not straightforward. For a higher thermal conductivity of porous material, the Nusselt number increases, monotonically, with increasing S, while, for a lower value of Rk, a minimum exists in the distributions. The enhanced longitudinal heat conduction, due to pulsating flow, is also examined. The maximum effective thermal diffusivity is found at a critical thickness of the porous layer.
Sharif Journal of Mechanical Engineering
Sharif University of Technology
26764725
دوره 25
v.
51.2
no.
2010
49
58
http://sjme.journals.sharif.edu/article_5626_69c5a127162bc604aa0b3c6b22ef26dc.pdf
MODELING OF TWOPHASE FLOW IN POROUS MEDIA BY MIXEDHYBRID FINITEELEMENT METHOD
b.
Firoozabadi
Dept. of Mechanical University Sharif University of Technology
author
K.
Goodarzi
Dept. of Mechanical University Sharif University of Technology
author
text
article
2010
per
In this paper, twophase ow equations in porous media were solved by the mixedhybrid finiteelement method. By using the definition of global pressure and global velocity, the governing equations were changed to a simpler numerical form. Consequently, the obtained pressure and saturation equations have less dependence on each other and the velocity appears in the saturation equation expilicitly. The Hybrid method solves the pressure and velocity equations simultaneously. Therefore, the velocity and pressure fields have the same order of accuracy. In this work, the saturation equation was also discretized, by the hybrid method. The above method was used in one and twodimensional test cases. Results show that predicted parameters, especially in coarse grids, are closer to the exact solution, in comparison with other methods.
Sharif Journal of Mechanical Engineering
Sharif University of Technology
26764725
دوره 25
v.
51.2
no.
2010
59
68
http://sjme.journals.sharif.edu/article_5627_22b8f025a526ca1fe0eae059cf49b6d9.pdf
DESIGN OF A MULTIFINGERED GRIPPER FOR CYLINDRICAL OBJECT MANIPULATION
h.
Sayyaadi
Dept. of Mechanical Engineering Sharif University of Technology
author
M.
Aghababaie
Dept. of Mechanical Engineering Sharif University of Technology
author
text
article
2010
per
One of the most important issues in multi fingered gripper is dexterous maneuver. In this research work manipulation of a cylindrical object is considered via three fingered hand. Rolling contacts between the fingers and object are modeled properly in work space using exponential approach. Initial and final maneuver path in the involved work space is designed and the mission approaches very well for this purposes. Since the motion of the fingers for rolling task is in very finite course, a very powerful method considering quasi static approach is utilized here, and the simulation results show the stability performances of the controlled object obviously. Deriving of the optimal contact forces had been developed by convex optimization and verification of these forces are validated by MATLAB software. Finally dynamics behavior of the finger typed robot considering all contact kinematical restrictions and the other effects are tested and results are depicted well.
Sharif Journal of Mechanical Engineering
Sharif University of Technology
26764725
دوره 25
v.
51.2
no.
2010
69
76
http://sjme.journals.sharif.edu/article_5628_a6168fd2f9f34ca0d2436c2c29524096.pdf
THE EFFECT OF RESIDUAL STRESSES ON THE FATIGUE BEHAVIOR OF ROTARY COMPONENTS
A.
Esmati
Mechanical Engineering Sharif University
author
GH.
Farahi
Mechanical Engineering Sharif University
author
M.
Sedighi

author
text
article
2010
per

Sharif Journal of Mechanical Engineering
Sharif University of Technology
26764725
دوره 25
v.
51.2
no.
2010
77
83
http://sjme.journals.sharif.edu/article_5629_652869fe3a4daa37f93ba8833ca356fb.pdf
MANIPULATOR WITH PREDEFINED STIFFNESS
M.A
Hoseini
Mechanical Engineering Babol University of Technology
author
H.R
MohammadiDaniel
Mechanical Engineering Babol University of Technology
author
M.J
Nategh

author
text
article
2010
per

Sharif Journal of Mechanical Engineering
Sharif University of Technology
26764725
دوره 25
v.
51.2
no.
2010
85
92
http://sjme.journals.sharif.edu/article_5630_6f3a3bcb9d9c2f855b88816d3e8e03d0.pdf

text
article
2010
per

Sharif Journal of Mechanical Engineering
Sharif University of Technology
26764725
دوره 25
v.
51.2
no.
2010
98
99
http://sjme.journals.sharif.edu/article_6423_3fbe38057958c83aad984ffe66fcea47.pdf

text
article
2010
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Sharif Journal of Mechanical Engineering
Sharif University of Technology
26764725
دوره 25
v.
51.2
no.
2010
95
97
http://sjme.journals.sharif.edu/article_6424_9df1ca75110a7e4548ac4d8d10b17095.pdf