2015
1
2
2
60
1

Analytical bending solution of fully clamped orthotropic rectangular plates resting on elastic foundations by the finite integral transform method
https://jacm.scu.ac.ir/article_10742.html
10.22055/jacm.2014.10742
1
This study presents exact bending solution of fully clamped orthotropic rectangular plates subjected to arbitrary loads resting on elastic foundations, based on the finite integral transform method. In this method, it is not necessary to determine the deformation function because the basic governing equations of the classical plate theory for orthotropic plates have been used. A detailed parametric study is conducted to elucidate the influences of stiffness of elastic medium, plate length, flexural rigidities and distributed transverse load on the deflections. The applicability of the method is extensive since it can solve any plates with different loadings. Numerical results are presented to demonstrate the validity and accuracy of the approach, as it is totally in agreement with the other studies.
0

52
58


Ali Mohammad
Moniri Bidgoli
Faculty of Mechanical Engineering, College of Engineering, University of Tehran, iran
Iran
a.m.moniribidgoli@gmail.com


Ali Reza
Daneshmehr
Faculty of Mechanical Engineering, College of Engineering, University of Tehran, iran
Iran
daneshmehr@ut.ac.ir


Reza
Kolahchi
Faculty of Mechanical Engineering, University of Kashan, Kashan, Iran
Iran
r.kolahchi@gmail.com
Analytical solution
Finite integral transform method
Foundation plate
Orthotropic rectangular plate
[[1] Timoshenko, S. P. and WoinowskyKrieger, S. W., Theory of Plates and Shell, McGrawHill, New York, 1959.##[2] Li, R., Zhong, Y., Tian, B., Liu, Y., “On the finite integral transform method for exact bending solutions of fully clamped orthotropic rectangular thin plates”, Applied Mathematics Letters, Vol. 22, pp. 1821–1827, 2009.##[3] Pan, B., Li, R., Su, Y., Wang, B., Zhong, Y., “Analytical bending solutions of clamped rectangular thin plates resting on elastic foundations by the symplectic superposition method”, Applied Mathematics Letters, Vol. 26, pp. 355–361, 2013.##[4] Chang, F. V., “Bending of a cantilever rectangular plate loaded discontinuously”, Applied Mathematics and Mechanics, Vol. 2, pp. 403–410, 1981.##[5] Lim, C. W., Cui, S., Yao, W. A., “On new symplectic elasticity approach for exact bending solutions of rectangular thin plates with two opposite sides simply supported”, International Journal of Solids and Structures, Vol. 44, pp. 5396–5411, 2007.##[6] Lim, C. W., Yao, W. A., Cui, S., “Benchmarks of analytical symplectic solutions for bending of corner supported rectangular thin plates”, IES Journal Part A: Civil & Structural Engineering, Vol. 1, pp. 106–115, 2008.##[7] Vallabhan, C. V. G., Straughan, W. T., Das, Y. C., “Refined model for analysis of plates on elastic foundations”, Journal of Engineering MechanicsASCE, Vol. 117, pp. 28302844, 1991.##[8] Huang, M. H., Thambiratnam, D. P., “Analysis of plate resting on elastic supports and elastic foundation by finite strip method”, Computers & Structures, Vol. 79, pp. 25472557, 2001.##[9] Civalek, Ö., Ulker, M., “Harmonic differential quadrature (HDQ) for axisymmetric bending analysis of thin isotropic circular plates”, Structural Engineering and Mechanics, Vol. 17, pp. 1–14, 2004.##[10] Barton, M. V., “Finite difference equations for the analysis of thin rectangular plates with combinations of fixed and free edges”, Defense Research Lab. Rep. No. 175, Univ. of Texas, 1948.##[11] Civalek, O., “Three dimensional vibration, buckling and bending analyses of thick rectangular plates based on discrete singular convolution method”, International Journal of Mechanical Sciences, Vol. 49, pp. 752–765, 2007.##[12] Shao, W., Wu, X., “Fourier differential quadrature method for irregular thin plate bending problems on Winkler foundation”, Engineering Analysis with Boundary Elements, Vol. 35, pp. 389394, 2011.##[13] Zenkour, A. M., Allam, M. N. M., Sobhy, M., “Bending of a fiberreinforced viscoelastic composite plate resting on elastic foundations”, Archive of Applied Mechanics, Vol. 81, pp. 77–96, 2011.##[14] Sneddon, I. N., The Use of Integral Transforms, McGrawHill, New York, 1972.##[15] Sneddon, I. N., Application of Integral Transforms in the Theory of Elasticity, McGrawHill, New York, 1975.##[16] Li, R., Zhong, Y., Tian, B., Du, J., “Exact bending solutions of orthotropic rectangular cantilever thin plates subjected to arbitrary loads”, International Applied Mechanics, Vol. 47, pp. 107119, 2011.##[17] Li, R., Tian, B., Zhong, Y., “Analytical bending solutions of free orthotropic rectangular thin plates under arbitrary loading”, Meccanica, Vol. 48, pp. 24972510, 2013.##]
1

Solution of strongly nonlinear oscillator problem arising in Plasma Physics with Newton Harmonic Balance Method
https://jacm.scu.ac.ir/article_10756.html
10.22055/jacm.2014.10756
1
In this paper, Newton Harmonic Balance Method (NHBM) is applied to obtain the analytical solution for an electron beam injected into a plasma tube where the magnetic field is cylindrical and increases towards the axis in inverse proportion to the radius. Periodic solution is analytically verified and consequently the relation between the Natural Frequency and the amplitude is obtained in an analytical form. A comparison of the period of the oscillation and obtained solution with the exact result illustrates that the NHBM is a powerful and efficient tool for solving nonlinear vibration equations.
0

59
66


Mohammad
Mashinchi Joubari
Dept. of Mechanical Engineering, Babol University of Technology, Babol, Iran
Iran
mmmjouybari@gmail.com


Mohammad Hadi
Pashaei
Assistant Professor, Department of Mechanical Engineering, Babol University of Technology, , Babol, Iran
Iran
mpashaei@nit.ac.ir


Hamid
Javaniyan Jouybari
Department of Mechanical Engineering, Babol University of Technology, Semnan, Iran
Iran
hamidjavaniyan@gmail.com
Electron beam
Frequency–Amplitude Relation
Plasma Physics
Newton Harmonic Balance Method
[[1] Ghadimi, M., Kaliji, H. D., Barari, A., “Analytical solutions to nonlinear mechanical oscillation problems”, Journal of Vibroengineering, Vol. 13, No. 2, pp. 133143, 2011.##[2] Fidlin, A., Nonlinear Oscillations in Mechanical Engineering, SpringerVerlag, Berlin Heidelberg, 2006.##[3] Mickens, R.E., Oscillations in planar Dynamics Systems, World Scientific, Singapore, 1996.##[4] He, J. H., Nonperturbative methods for strongly nonlinear problems, Disseration, deVerlag in Internet GmbH, Berlin, 2006.##[5] Junfeng, Lu., “An analytical approach to the Fornberg–Whitham type equations by using the variational iteration method”, Computers and Mathematics with Applications, Vol. 61, pp. 20102013, 2011.##[6] Nawaz, Yasir., “Variational iteration method and homotopy perturbation method for fourthorder fractional integrodifferential equations”, Computers and Mathematics with Applications, Vol. 61, pp. 23302341, 2011.##[7] Moghimia, S.M., Ganji, D.D., Bararnia, H., Hosseini, M., Jalaal, M., “Homotopy perturbation method for nonlinear MHD Jeffery–Hamel Problem”, Computers and Mathematics with Applications, Vol. 61, pp. 22132216, 2011.##[8] Ghotbi, Abdoul. R., Bararnia, H., Domairry, G., Barari, A., “Investigation of a powerful analytical method into natural convection boundary layer flow”, Commun Nonlinear Sci Numer Simulat, Vol. 14, pp. 22222228, 2009.##[9] Sohouli, A.R., Famouri, M., Kimiaeifar, A., Domairry, G., “Application of homotopy analysis method for natural convection of Darcian fluid about a vertical full cone embedded in pours media prescribed surface heat flux”, Commun Nonlinear Sci Numer Simulat, Vol. 15, pp. 16911699, 2010.##[10] Fereidoon, A., Ganji, D.D., Kaliji, H.D., Ghadimi, M., “Analytical solution for vibration of buckled beams”, International Journal of Research and Reviews in Applied Sciences. Vol. 4, No. 3, pp. 1721, 2010.##[11] Farrokhzad, F., Mowlaee, P., Barari, A., Choobbasti, A.J., Kaliji, H.D., “Analytical investigation of beam deformation equation using perturbation, homotopy perturbation, variational iteration and optimal homotopy asymptotic methods”, Carpathian Journal of Mathematics, Vol. 27, No. 1, pp. 5163, 2011.##[12] Guo, Shimin, Mei, Liquan, “The fractional variational iteration method using He’s polynomials”, Physics Letters A, Vol. 375, pp. 309–313, 2011.##[13] Biazar, Jafar., Gholami Porshokouhi, Mehdi., Ghanbari, Behzad., Gholami Porshokouhi, Mohammad., “Numerical solution of functional integral equations by the variational iteration method”, Journal of Computational and Applied Mathematics, Vol. 235, pp. 25812585, 2011.##[14] Xu, Lan, “He's parameterexpanding methods for strongly nonlinear oscillators”, Journal of Computational and Applied Mathematics, Vol. 207, pp. 148154, 2007.##[15] Barari, A., Kaliji, H.D., Ghadimi, M., Domairry, G., “Nonlinear vibration of EulerBernoulli beams”, Latin American Journal of Solids and Structures, Vol. 8, pp. 139148, 2011.##[16] He, J.H., “Some asymptotic methods for strongly nonlinear equations”, International Journal of Modern Physics B, Vol. 20, pp. 11411199, 2006.##[17] Mashinchi Joubari, M., Asghari, R., “Analytical Solution for Nonlinear Vibration of MicroElectromechanical System (MEMS) by FrequencyAmplitude Formulation Method”, The Journal of Mathematics and Computer Science, Vol. 4, No.3, pp. 371379, 2012.##[18] He, J.H., “Max–Min approach to nonlinear oscillators”, Int. J. Nonlinear Sci. Numer. Simul, Vol. 9, No. 2, pp. 207210, 2008.##[19] Belendez, A., Gimeno, E., Fernandez, E., Mendez, D.I., Alvarez, M.L., “Accurate approximate solution to nonlinear oscillators in which the restoring force is inversely proportional to the dependent variable”, Physica Scripta, Vol. 77, No. 6, 2008.##[20] Belendez, A., Mendez, D.I., Belendez, T., Hernandez, A., Alvarez, M.L., “Harmonic balance approaches to the nonlinear oscillators in which the restoring force is inversely proportional to the dependent variable”, Journal of Sound and Vibration, Vol. 314, pp. 775782, 2008.##[21] Belendez, A., Pascual, C., “Harmonic balance approach to the periodic solutions of the (an)harmonic relativistic oscillator”, Physics Letters A, Vol. 371, pp. 291299, 2007.##[22] Hu, H., Tang, J.H., “Solution of a Duffingharmonic oscillator by the method of harmonic balance”, Journal of Sound and Vibration, Vol. 294, pp. 637639, 2006.##[23] Mickens, R.E., “Harmonic balance and iteration calculations of periodic solutions to ”, Journal of Sound and Vibration, Vol. 306, pp. 968972, 2007.##[24] Wu, B.S., Sun, W.P., Lim, C.W., “An analytical approximate technique for a class of strongly nonlinear oscillators”, International Journal of NonLinear Mechanics, Vol. 41, pp. 766774, 2006.##[25] Lai, S.K., Lim, C.W., Wu, B.S., Wang, C., Zeng, Q.C., He, X.F., “Newton–harmonic balancing approach for accurate solutions to nonlinear cubic–quintic Duffing oscillators”, Applied Mathematical Modelling, Vol. 33, pp. 852866, 2009.##[26] Mashinchi Joubari, M., Asghari, R., Zareian Jahromy, M., “Investigation of the Dynamic Behavior of Periodic Systems with Newton Harmonic Balance Method”, Journal of Mathematics and Computer Science, Vol. 4, No. 3, pp. 418427, 2012.##[27] Mirzabeigy, A., Kalami Yazdi, M., Yildirim, A., “Analytical approximations for a conservative nonlinear singular oscillator in plasma physics”, Journal of the Egyptian Mathematical Society, Vol. 20, No. 3, pp. 163166, 2012.##]
1

Design of an AdaptiveNeural Network Attitude Controller of a Satellite using Reaction Wheels
https://jacm.scu.ac.ir/article_10757.html
10.22055/jacm.2014.10757
1
In this paper, an adaptive attitude control algorithm is developed based on neural network for a satellite using four reaction wheels in a tetrahedron configuration. Then, an attitude control based on feedback linearization control is designed and uncertainties in the moment of inertia matrix and disturbances torque have been considered. In order to eliminate the effect of these uncertainties, a multilayer neural network with backpropagation law is designed. In this structure, the parameters of the moment of inertia matrix and external disturbances are estimated and used in feedback linearization control law. Finally, the performance of the designed attitude controller is investigated by several simulations.
0

67
73


Abbas
Ajorkar
Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran
Iran
ajorkar@aut.ac.ir


Alireza
Fazlyab
Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran
Iran
afazlyab@aut.ac.ir


Farhad
Fani saberi
Space Science and Technology Institute, Amirkabir University of Technology, Tehran, Iran
Iran
f.sabery@aut.ac.ir


Mansour
Kabganian
Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran
Iran
kabgan@aut.ac.ir
Attitude Control
Adaptiveneural network control
Satellite
Reaction wheel
[[1] Stazizar, A. J., “Investigation of Flow Phenomena in a transonic Fan Rotor Using Laser Anemometry”, ASME Journal of Engineering for Gas Turbines and Power, Vol. 107, No. 2, pp. 427435, 1985.##[2] Myers, R. H. and Montgomery, D. C., Response Surface Methodology: Process and product optimization using designed experiments, John Wiley & Sons, New York, 1995.##[3] Guinta, A. A., “Aircraft Multidisciplinary Design Optimization Using Design of Experimental Theory and Response Surface Modeling Methods”, Ph. D. Thesis, Department of Aerospace Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, 1997.##[4] Jameson, A., Schmidt, W., and Turkel, E., “Numerical Solutions of the Euler Equation by Finite Volume Methods Using RungeKutta Time Stepping Schemes”, AIAA 811259, 1981.##[5] Denton, J. D., Xu, L., “The Effects of Lean and Sweep on Transonic Fan Performance”, ASME Turbo Expo, Amsterdam, Netherlands, GT200230327, 2002.##[6] T. Burns, US Patent No. 358498, 1995.##[1] Chelaru, T. V., Cristian, B., and Chelaru, A., “Mathematical model for small satellites, using rotation angles and optimal control synthesis”, in Recent Advances in Space Technologies (RAST), Istanbul, Turkiye, 2011.##[2] ElGohary, A., "Optimal control for the attitude stabilization of a rigid body using non redundant parameterz", International Journal of NonLinear Mechanics, Vol. 9, pp. 100413, 2006.##[3] Hu, Q., and Xiao, B., "Intelligent proportionalderivative control for flexible spacecraft attitude stabilization with unknown input saturation", Aerospace Science and Technology, Vol. 23, pp. 6374, 2012.##[4] Qinglei, H., "Sliding mode maneuvering control and active vibration damping three axis stabilized flexible spacecraft with actuator dynamics", Nonlinear Dynamics, Vol. 15, pp. 227248, 2008.##[5] Moradi, M., "Selftuning PID controller to threeaxis stabilization of a satellite with unknown parameters", International Journal of NonLinear Mechanics, Vol. 49, pp. 5056, 2013.##[6] Shahravi, M., and Kabganian, M., "Attitude tracking and vibration suppression of flexible spacecraft using implicit adaptive control law", in American Control Conference, Portland, OR, USA, 2005.##[7] Shahravi, M., Kabganian, M., and Alasty, A., "Adaptive robust attitude control of a flexible spacecraft", International Journal of Robust and Nonlinear Control, Vol. 16, no. 6, pp. 287302, 2006.##[8] Guan, P., Liu, X. J., and Liu, J. Z., "Adaptive fuzzy sliding mode control for flexible satellite", Engineering Applications of Artificial Intelligence, Vol. 18, no. 4, pp. 451459, 2005.##[9] Jin, E., and Sun, Z., "Robust controllers design with finite time convergence for rigid spacecraft attitude tracking control", Aerospace, Vol. 4, pp. 324330, 2008.##[10] Park, Y., "Robust and optimal attitude stabilization of spacecraft with external disturbances", Aerospace Science and Technology, Vol. 9, pp. 253259, 2005.##[11] Dong, C., Xu, L., Chen, Y., and Wang, Q., "Networked flexible spacecraft attitude maneuver based on adaptive fuzzy sliding mode control", Acta Astronautica, Vol. 65, no. 1112, pp. 15611570, 2009.##[12] Sidi, M. J., Spacecraft Dynamics and control: a practical engineering approach, Cambridge University Press, 1997.##[13] Zhenning, H., and Balakrishnan, S., "Parameter Eatimation in Nonlinear Systems Using Hopfield Neural Networks", AIAA Journal of Aircraft, Vol. 42, pp. 4153, 2005.##[14] Atenica, M., Joya, G., and Sandoval, F., "Hopfield Neural Networks for Parametric Identification of Dynamical Systems", Neural Processing Letters, Vol. 21, no. 2, pp. 143152, 2005.##[15] Wertz, J., Spacecraft Attitude Determination and Control, Kluwer Academic, London, 1978.##[16] Hablani, H., "Multiaxis Tracking and Attitude Control of Flexible Spacecraft with Reaction Jets", AIAA Journal of Guidance, Control and Dynamics, Vol. 17, pp. 831839, 1994.##[17] Hyungjoo, Y., “Spacecraft Attitude and Power Control Using Variable Speed Control Moment Gyros”, Ph. D. Thesis, Department of Aerospace Engineering, Georgia Institute of Technology, 2004.##]
1

Numerical Investigation on Slot air Jet impingement Heat Transfer between Horizontal Concentric Circular Cylinders
https://jacm.scu.ac.ir/article_10758.html
10.22055/jacm.2014.10758
1
A numerical study has been carried out for slot air jet impingement cooling of horizontal concentric circular cylinders. The slot air jet is situated at the symmetry line of a horizontal cylinder along the gravity vector and impinges on the bottom of the outer cylinder which is designated as θ=0°. The outer cylinder is partially opened at the top with a width of W=30mm and is kept at constant temperature T= 62°C. The inner cylinder which is a part of the slot jet structure is chosen to be insulated. The effects of jet Reynolds number in the range of 100≤ Rej ≤1000 and the ratio of spacing between nozzle and outer cylinder surface to the jet width for H=4.2 and H=12.5 on the local and average Nusselt numbers are examined. In the numerical study, FLUENT CFD package is used and validated by comparing the results with the experimental data at the same Reynolds number. It is observed that the maximum Nusselt number occurs at the stagnation point at (θ=0°) and the local heat transfer coefficient decreases on the circumference of the cylinder with increase of θ as a result of thermal boundary layer thickness growth. Also, results show that the local and average heat transfer coefficients are raised by increasing the jet Reynolds number and by decreasing the nozzletosurface spacing.
0

74
82


Arash
Azimi
Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran
Iran
azimi.arash84@gmail.com


Mehdi
Ashjaee
Department of Mechanical Engineering, University of Tehran
Iran
ashjaee@ut.ac.ir


Morteza
Khayat
Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran
Iran
mkhayat@srbiau.ac.ir
heat transfer
Impingement cooling
Slotjet
Concentric cylinders
[[1] J. W. Baughn, A. E. Hechanova, and X. Yan, "An Experimental Study of Entrainment Effects on the Heat Transfer From a Flat Surface to a Heated Circular Impinging Jet," Journal of Heat Transfer, vol. 113, pp. 10231025, 1991.##[2] J. W. Baughn and S. Shimizu, "Heat Transfer Measurements From a Surface With Uniform Heat Flux and an Impinging Jet," Journal of Heat Transfer, vol. 111, pp. 10961098, 1989.##[3] M. Fenot, J. J. Vullierme, and E. Dorignac, "Local heat transfer due to several configurations of circular air jets impinging on a flat plate with and without semiconfinement," International Journal of Thermal Sciences, vol. 44, pp. 665675, 7// 2005.##[4] R. Gardon and J. C. Akfirat, "Closure to “Discussion of ‘Heat Transfer Characteristics of Impinging TwoDimensional Air Jets’” (1966, ASME J. Heat Transfer, 88, pp. 107–108)," Journal of Heat Transfer, vol. 88, pp. 108108, 1966.##[5] R. J. Goldstein, K. A. Sobolik, and W. S. Seol, "Effect of Entrainment on the Heat Transfer to a Heated Circular Air Jet Impinging on a Flat Surface," Journal of Heat Transfer, vol. 112, pp. 608611, 1990.##[6] Y.T. Yang, T.C. Wei, and Y.H. Wang, "Numerical study of turbulent slot jet impingement cooling on a semicircular concave surface," International Journal of Heat and Mass Transfer, vol. 54, pp. 482489, 2011.##[7] M. Choi, H. S. Yoo, G. Yang, J. S. Lee, and D. K. Sohn, "Measurements of impinging jet flow and heat transfer on a semicircular concave surface," International Journal of Heat and Mass Transfer, vol. 43, pp. 18111822, 5/15/ 2000.##[8] N. Kayansayan and S. Küçüka, "Impingement cooling of a semicylindrical concave channel by confined slotairjet," Experimental Thermal and Fluid Science, vol. 25, pp. 383396, 12// 2001.##[9] H. Eren, B. Yesilata, and N. Celik, "Nonlinear flow and heat transfer dynamics of impinging jets onto slightlycurved surfaces," Applied Thermal Engineering, vol. 27, pp. 26002608, 2007.##[10] M. Fenot, E. Dorignac, and J. J. Vullierme, "An experimental study on hot round jets impinging a concave surface," International Journal of Heat and Fluid Flow, vol. 29, pp. 945956, 8// 2008.##[11] V. I. Terekhov, S. V. Kalinina, Y. M. Mshvidobadze, and K. A. Sharov, "Impingement of an impact jet onto a spherical cavity. Flow structure and heat transfer," International Journal of Heat and Mass Transfer, vol. 52, pp. 24982506, 5// 2009.##[12] B. V. N. R. Kumar and B. V. S. S. S. Prasad, "Computational flow and heat transfer of a row of circular jets impinging on a concave surface," Heat and Mass Transfer, vol. 44, pp. 667678, 2008/04/01 2008.##[13] G. Hu and L. Zhang, "Experimental and Numerical Study on Heat Transfer with Impinging Circular Jet on a Convex Hemispherical Surface," Heat Transfer Engineering, vol. 28, pp. 10081016, 2007/12/01 2007.##[14] M. A. R. Sharif and K. K. Mothe, "Parametric study of turbulent slotjet impingement heat transfer from concave cylindrical surfaces," International Journal of Thermal Sciences, vol. 49, pp. 428442, 2010.##[15] E. Öztekin, O. Aydin, and M. Avcı, "Heat transfer in a turbulent slot jet flow impinging on concave surfaces," International Communications in Heat and Mass Transfer, vol. 44, pp. 7782, 2013.##[16] E. Öztekin, O. Aydin, and M. Avcı, "Hydrodynamics of a turbulent slot jet flow impinging on a concave surface," International Communications in Heat and Mass Transfer, vol. 39, pp. 16311638, 2012.##[17] in Fluent User’s Guide, Release 6.2, Fluent Incorporated, ed.##[18] W. Hauf and U. Grigull, "Optical methods in heat transfer," advances in heat transfer, vol. 6, pp. 133366, 1970.##[19] E. Eckert and R. J. Goldstein, Measurements in Heat Transfer. New York: McGrawHill, 1972##]
1

Investigation the effects of injection pressure and compressibility and nozzle entry in diesel injector nozzle’s flow
https://jacm.scu.ac.ir/article_10766.html
10.22055/jacm.2014.10766
1
Investigating nozzle’s orifice flow is challenging both experimentally and theoretically. This paper focuses on simulating flow inside diesel injector nozzle via Ansys fluent v15. Validation is performed with experimental results from Winkhofler et al (2001). Several important parameters such as mass flow rate, velocity profiles and pressure profiles are used for this validation. Results include the effects of contraction inside nozzle’s orifice, effect of compressibility; effect of injection pressures and several orifice entries are also simulated in this study. To consider the effect of compressibility, a user defined function used in this simulation. The Cavitation model which is used in this simulation is Singhal et al. (2002) cavitation model. Presto discretization method is used for Pressure equation and second upwind discretization method is used for Momentum equation. Converging Singhal et al. cavitation model is very challenging and it needs several efforts and simulations.
0

83
94


Seyed mohammadjavad
Zeidi
Shahid Rajaee Teacher Training University (SRTTU) Lavizan, Tehran, Iran
Iran
mohammadjavad 333 @gmail.com


Miralam
Mahdi
Shahid Rajaee Teacher Training University (SRTTU) Lavizan, Tehran, Iran
Iran
m.mahdi@sru.ac.ir
Two phase flow
Mass flow rate
Nozzle entry
Cavitation
Singhal
[[1] PHD thesis. Daniele Liuzzi, 2012.” TwoPhase Cavitation Modelling”. UNIVERSITY OF ROME  LA SAPIENZA ##[2] Faeth, G. M. and Hsiang, LP and Wu, PK, 1995. “Structure and Breakup Properties of Sprays”. International Journal of Multiphase Flow, 21, pp. 99–127.##[3] Sato, K. and Saito, Y. (2001) Unstable cavitation behaviour in circularcylindrical orifice flow. Proc. of the 4th Int. Symposium on Cavitation: CAV2001, 8 p.##[4] Stinebring, D.R., Billet, M.L., Lindau, J.W. and Kunz, R.F. (2001) Developed cavitationcavity dynamics. VKI Lecture Series on Supercavitating Flows. VKI Press, Brussels, 2001, 20 p.##[5] Bergwerk, W. (1959) Flow Pattern in Diesel Nozzle Spray Holes. Proc. Inst. Mech Engrs., 1959, Vol.173, pp. 655 – 660.##[6] Winklhofer, E., Kull, E., Kelz, E., Morozov, A. (2001) Comprehensive hydraulic and flow field documentation in modl throttle experiments under cavitation conditions. Proceedings of the ILASSEurope Conference, Zurich, 26 September, 2001, pp. 574 – 579.##[7] PHD thesis.SERGEY MARTYNOV (2005).” Numerical Simulation of the Cavitation Process in Diesel Fuel Injectors”.##[8] Ansys Fluent v14 Documentation.##[9] Singhal, A.K., Athavale, M.M., Li, H., Jiang Yu (2002) Mathematical basis and validation of the full cavitation model. Tr. ASME, J. Fluid Eng., Vol.124, pp. 617 – 624.##[10] Han, J. S., Lu, P. H., Xie, X. B., Lai, M. C., and Henein, N. A., 2002, “Investigation of Diesel Spray Break Up and Development for Different Nozzle Geometries,” SAE Paper No. 2002012775.##[11] Menter F R. TwoEquation eddyviscosity turbulence models for engineering applications [J]. AIAA Journal, 1994, 32(8): 15981605.##[12] Hinze, J. O., 1975, Turbulence, 2nd Ed. McGraw Hill, New York.##[13] X.margot, S.Hoyas, A.Gil,,S.Patouna, 2012.”Numerical modelling of cavitation:validation and parametric studies”. Engineering application of computional fluid mechanics Vol 6, No. 1, pp. 1524.##[14] Naber, J. D., and Siebers, D. L., 1996, “Effects of Gas Density and Vaporization on Penetration and Dispersion of Diesel Sprays,” SAE Paper No. 960034.##[15] Spikes, R.H., and Pennington, G.A. (1959) Discharge coefficient of small submerged orifices. Proc. Inst. Mech. Engineers, pp. 661 – 674.##[16] Nurick, W.H. (1976) Orifice cavitation and its effect on spray mixing. J. Fluids Engng., 98, pp. 681 – 689.##[17] Hiroyasu, h. (2000) Spray breakup mechanism from the holetype nozzle and its applications. Atomization and Sprays, Vol.10, pp. 511527.##[18] Laoonual, Y., Yule, A.J, and Walmsley, S.J. (2001). Internal fluid flow and spray visualization for a largescale VCO orifice injector nozzle. ILASSEurope 2001, Zurich 26 September, 2001. 6 p.##[19] Blessing, M., Konig, G., Kruger, C., Michels, U., and Schwarz, V. (2003) Analysis of flow and cavitation phenomena in Diesel injection nozzles and its effects on spray and mixture formation. SAE paper 2003011358, pp. 29 – 39.##[20] Benajes, J., Pastor, J.V., Payri, R. and Plazas, A.H. (2004) Experiments for the different values of Kfactor. J. Fuids Engineering, Vol.126, p. 63.##]
1

Optimizing Hydro Power Turbines in Order to Secure the Passage of Fishes in Khuzestan province
https://jacm.scu.ac.ir/article_10755.html
10.22055/jacm.2014.10755
1
Nowadays, it is important to consider environmental issues, as ecological problems and their severe effects are intensifying in Iran, particularly in Khuzestan province. The environmental effects of hydroelectric plants are highly regarded due to their significant impact on an extensive area. Lack of safe path for fish passing through the turbines is one of these damages. In order to deal with these challenges, researchers are trying to optimize hydro power turbines. In this optimization, old runners were replaced. Meanwhile, conditions of fish passing through the turbines and fish survival have been improved. Considering the existence of six hydroelectric power plants in Khuzestan province, it would be possible to conduct optimization or constructing studies with a fishfriendly approach for the safe passage of fishes to slightly reduce the extent of environmental damages.
0

95
102


Moona
Mohammadi
Master of Science at Mechanical Engineering, Khuzestan Water & Power Authority, Ahvaz, Iran
Iran
moona_mohammadi@yahoo.com


Ali Reza
Mohammadi
Master of Science at Mechanical Engineering, Turbine Machine M.E. Company, Ahvaz, Iran
Iran
aalirezamohammadi@gmail.com


Mohammad Reza
Mohammadi
Master of Science at Mechanical Engineering, National Iranian Gas Company, Boshehr, Iran
Iran
mhrz_mohammadi@yahoo.com.au
hydro power turbine
fishfriendly turbine
optimization of hydro power turbine
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An investigation the effects of geometric tolerances on the natural frequencies of rotating shafts
https://jacm.scu.ac.ir/article_10767.html
10.22055/jacm.2014.10767
1
This paper examines the effects of geometric tolerances on the natural frequencies of rotating shafts. In order to model the tolerances, a code is written in MATLAB 2013 that produces deviated points. Deviated points are controlled by different geometric tolerances, including cylindricity, total runout and coaxiality tolerances. Final surfaces and models passing through the points are created using SolidWorks 2013 and finally modal analysis is carried out with FE software. It is observed whenever the natural frequency is higher or the geometric tolerances are greater, natural frequencies of the real and ideal shafts are more distant. Also, the difference percentage between ideal and real frequencies is investigated. The results show that the percentage value is approximately constant for every mode shapes.
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Ali Akbar
Ansarifard
Amirkabir University of Technology
Iran
ali.ansarifard@yahoo.com


Abdolrahman
Jaamialahmadi
Ferdowsi University of Mashhad
Iran
jaamia@um.ac.ir
Geometric tolerance
Natural frequency
critical rotational speed
rotating shafts
modal analysis
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