Research Paper Vibration
Experimental and finite-element free vibration analysis and artificial neural network based on multi-crack diagnosis of non-uniform cross-section beam

B. Asmar; M. Karimi; F. Nazari; A. Bolandgerami

Volume 5, Issue 1 , December 2015, Pages 1-11

  Crack identification is a very important issue in mechanical systems, because it is a damage that if develops may cause catastrophic failure. In the first part of this research, modal analysis of a multi-cracked variable cross-section beam is done using finite element method. Then, the obtained results ...  Read More

Research Paper Fluid Mechanics
Thermo-elasto-hydrodynamic (TEHD) analysis of oil film lubrication in big end bearing of a diesel engine

H. Chamani; H. Karimaei; M. Bahrami; S. M. Agha Mirsalim

Volume 5, Issue 1 , December 2015, Pages 13-24

  Nowadays, due to the increasing power of diesel engines, especially heavy duty diesel engines, and increasing gas pressure inside the combustion chamber, the forces acting on the engine bearings have dramatically raised. On the other hand, becaus eof the competition in the market, it is necessary to ...  Read More

Research Paper Vibration
Assessing different nonlinear analysis methods for free vibrations of initially stressed composite laminated plates

H. M. Panahiha; A. Davar

Volume 5, Issue 1 , December 2015, Pages 25-35

  In this paper, the nonlinear free vibrations of thin symmetric and non-symmetric cross-ply composite plates subjected to biaxial initial stresses are investigated. Because of their excellent properties such as specific strength and specific stiffness, composite plates have wide applications in aerospace ...  Read More

Research Paper Plasticity
New implementation of a non-associated flow rule in rate-independent plasticity

F. Moayyedian; M. Kadkhodayan

Volume 5, Issue 1 , December 2015, Pages 37-49

  One of the new research fields in plasticity is related to choosing a proper non-associated flow rule (NAFR), instead of the associated one (AFR), to predict the experimental results more accurately. The idea of the current research is derived from combining von Mises and Tresca criteria in the places ...  Read More

Research Paper Vibration
Application of linear and nonlinear vibration absorbers for the nonlinear beam under moving load

Nadia Parandeh Afshar; Farhad S. Samani; Moslem Molaie

Volume 5, Issue 1 , December 2015, Pages 51-60

  Recently, a large amount of studies have been related to nonlinear systems with multi-degrees of freedom as well as continuous systems. The purpose of this paper is to optimize passive vibration absorbers in linear and nonlinear states for an Euler-Bernoulli beam with a nonlinear vibratory behavior under ...  Read More

Research Paper Thermodynamics and Cumbustion
Internal combustion engines in cylinder flow simulation improvement using nonlinear k-ε turbulence models

A. A. Mirmohammadi; F. Ommi

Volume 5, Issue 1 , December 2015, Pages 61-69

  The purpose of this paper is to studying nonlinear k-ε turbulence models and its advantages in internal combustion engines, since the standard k-ε model is incapable of representing the anisotropy of turbulence intensities and fails to express the Reynolds stresses adequately in rotating ...  Read More

Research Paper Vibration
Free vibrations analysis of a sandwich rectangular plate with electrorheological fluid core

M. M. Soleymani; M. A. Hajabasi; S. Elahi Mahani

Volume 5, Issue 1 , December 2015, Pages 71-81

  In this paper, a rectangular sandwich plate with a constrained layer and an electrorheological (ER) fluid core is investigated. The rectangular plate is covered an ER fluid core and a constraining layer to improve the stability of the system. The two outer layers of the sandwich structure are elastic. ...  Read More