Islamic Azad University, Khomeinishahr Branch
Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
2008-4927
10
2
2017
05
01
Investigation of Shape Functions Role on the Mesh-free Method Application in Soft Tissue Elastography
5
12
EN
Hamed
Ajabi Naeeni
Islamic Azad University, Khomeinishahr Branch
ajabinaeeni@iaukhsh.ac.ir
Mohammad
Haghpanahi
Department of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
Hamid
Behnam
Department of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran
behnam@iust.ac.ir
Hadi
Pirali
Department of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
hadi.pirali@yahoo.com
In current study, The Mesh-free method based on weak-form formulation coupled with the ultrasound imaging technique is developed. This problem consists in computing the deformation of an elastic non-homogenous phantom by numerical methods (both Mesh-free and Finite Element) and converge their results to the measured deformation by the ultrasound. The shape functions of Mesh-free are approximated by the Moving Least Square (MLS) method. The effect of Shape functions on the Mesh-free results are analyzed and discussed with the several simulations in 2D domain.
Elastography,Mesh-Free,Soft Tissue Phantom
http://jsme.iaukhsh.ac.ir/article_531133.html
http://jsme.iaukhsh.ac.ir/article_531133_54557a821463a2499bde216d68e9c091.pdf
Islamic Azad University, Khomeinishahr Branch
Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
2008-4927
10
2
2017
05
01
Stress intensity factor at the hole-edge cracks tips in a finite plate
13
20
EN
Mohammad Rahim
Torshizian
Islamic Azad University, Mashhad Branch
torshizian@mshdiau.ac.ir
In the current research work, the problem of fracture mechanics in a plate with a central hole under tensile loading is studied. The stress intensity factors are calculated for a finite plate containing two symmetrical hole-edge cracks. The problem is solved by two different methods, namely the finite element method and the FRANC software analysis. At first the finite element method is used and by writing a program in MATLAB software the stress intensity factors at the crack tips are calculated. The same problem is then reanalyzed with the Franc software and the results are compared. The effects of various factors such as the hole diameter, crack length and crack angle have been investigated on stress intensity factors. The results show that for small crack lengths, the effect of cracks length is more than that of the hole diameter on variation of normalized stress intensity factors, while it is the opposite for large crack lengths, the effect of hole diameter is more than that of the cracks length on variation of normalized stress intensity factors.
Stress intensity factor,hole-edge cracks,Finite Element,Franc software
http://jsme.iaukhsh.ac.ir/article_532853.html
http://jsme.iaukhsh.ac.ir/article_532853_4581be0313809d7cea627b400f01dad1.pdf
Islamic Azad University, Khomeinishahr Branch
Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
2008-4927
10
2
2017
05
01
Evaluation of two lattice Boltzmann methods for fluid flow simulation in a stirred tank
21
34
EN
SeyedMehdi
Naghavi
Department of mechanical engineering, Islamic Azad university, Isfahan,Iran
naghavi@iaukhsh.ac.ir
In the present study, commonly used weakly compressible lattice Boltzmann method and Guo incompressible lattice Boltzmann method have been used to simulate fluid flow in a stirred tank. For this purpose a 3D Parallel code has been developed in the framework of the lattice Boltzmann method. This program has been used for simulation of flow at different geometries such as 2D channel fluid flow and 3D stirred tank fluid flow. It has been shown that in addition to elimination of compressibility error, the Guo incompressible method eliminates mass leakage error from the fluid flow simulations although its implementation is as easy as the weakly compressible Lattice Boltzmann method. By the way, comparison between results of the two methods shows that differences in local flow quantities are negligible in both methods; however, for overall flow quantities, the results of Guo incompressible method are more accurate than those of weakly compressible method.
lattice boltzmann method,Stirred tank,Turbulent flow,Guo Incompressible lattice Boltzmann method,parallel programming
http://jsme.iaukhsh.ac.ir/article_532854.html
http://jsme.iaukhsh.ac.ir/article_532854_596a35305e89f856bad09f91e4c953ae.pdf
Islamic Azad University, Khomeinishahr Branch
Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
2008-4927
10
2
2017
05
01
Thermo-mechanical analysis of a coated cylinder head
35
48
EN
Hojjat
Ashouri
Sama technical and vocational training college, Islamic Azad University, Varamin Branch, Varamin, Iran
ashouri1394@gmail.com
This paper presents finite element analysis (FEA) of a coated and uncoated cylinder heads of a diesel engine to examine the distribution of temperature and stress. A thermal barrier coating system was applied on the combustion chamber of the cylinder heads, consists of two-layer systems: a ceramic top coat (TC), made of yttria stabilized zirconia (YSZ), ZrO2-8%Y2O3 and also a metallic bond coat (BC), made of Ni-Cr-Al-Y. The coating system in this research comprises 300 μm zirconium oxide TC and 150 μm BC. The three-dimensional model of the cylinder heads was simulated in abaqus software and a two-layer viscoplasticity model was utilized to investigate the elastic, plastic and viscous behavior of the cylinder heads. The elastic and plastic properties of BC and TC layers were considered and the effect of thermal barrier coatings on distribution of temperature and stress was investigated. The aim of this study is to compare the distribution of temperature and stress in the coated and uncoated cylinder heads under thermo-mechanical loads. The results of FEA showed that the thermal barrier coating system reduces the temperature about 53°C because of its lower thermal conductivity. As a result, the cylinder heads tolerates lower temperature and fatigue life will increase. The results of thermo-mechanical analysis indicated that the stress in the coated cylinder heads decreased approximately 24 MPa for the sake of depletion of temperature gradient which can lead to higher fatigue lifetime.
thermal barrier coating,Finite Element Analysis,cylinder heads and valves bridge
http://jsme.iaukhsh.ac.ir/article_533508.html
http://jsme.iaukhsh.ac.ir/article_533508_81faea03581ce210472b88a70101f161.pdf
Islamic Azad University, Khomeinishahr Branch
Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
2008-4927
10
2
2017
10
14
Computational fluid dynamics analysis and geometric optimization of solar chimney power plants by using of genetic algorithm
49
60
EN
Amir
Karami
1Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran
amirkarami@iaukhsh.ac.ir
Davood
Toghraie
Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran, Toghraee@iaukhsh.ac.ir
toghraee@iaukhsh.ac.ir
In this paper, a multi-objective optimization method is implemented by using of genetic algorithm techniques in order to determine optimum configuration of solar chimney power plant. The objective function which is simultaneously considered in the analysis is output power of the plant. Output power of the system is maximized. Design parameters of the considered plant include collector radius (Rc), collector height (Hc), chimney height (Ht), chimney radius (Rt) and heat flux ( ). The multi-objective optimization results show that there are a strong positive correlation between the chimney height and the output power, as well as a negative correlation between the solar collector radius and the output power. Also, it was concluded that, output power of the plant could be considerably increased with increasing solar chimney height while increasing collector radius could slightly reduce output power This study may be useful for the preliminary estimation of power plant performance and the power-regulating strategy option for solar chimney turbines.
Solar Chimney,Geometric Optimization,Genetic algorithm,Output Power,collector
http://jsme.iaukhsh.ac.ir/article_533509.html
http://jsme.iaukhsh.ac.ir/article_533509_fc84d808ba4a20f90fdb55acf37646aa.pdf
Islamic Azad University, Khomeinishahr Branch
Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
2008-4927
10
2
2017
11
19
On the dynamic stability of a flying vehicle under the follower and transversal forces
61
76
EN
Omid
Kavianipour
Young Researchers and Elite Club, Damavand Branch, Islamic Azad University, Damavand, Iran
o.kavianipour@gmail.com
Majid
Sohrabian
Department of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
o.kavianipour@yahoo.com
This paper deals with the problem of the instability regions of a free-free uniform Bernoulli beam consisting of two concentrated masses at the two free ends under the follower and transversal forces as a model for a space structure. The follower force is the model for the propulsion force and the transversal force is the controller force. The main aim of this study is to analyze the effects of the concentrated masses on the beam instability. It is determined that the transverse and rotary inertia of the concentrated masses cause a change in the critical follower force. This paper also offers an approximation method as a design tool to find the optimal masses at the two tips using an artificial neural network (ANN) and genetic algorithm (GA). The results show that an increase in the follower and transversal forces leads to an increase of the vibrational motion of the beam which is not desirable for any control system and hence it must be removed by proper approaches.
Beam instability,Follower force,Vibration analysis,Artificial Neural Network (ANN),Genetic Algorithm (GA)
http://jsme.iaukhsh.ac.ir/article_535389.html
http://jsme.iaukhsh.ac.ir/article_535389_1ce6b83167dbd497ef325fecb08218cc.pdf