On efficient use of simulated annealing in complex structural optimization problems

The paper is concerned with the efficient use of simulated annealing (SA) in structural optimization problems of high complexity. A reformulation of the working mechanism of the Boltzmann parameter is introduced to accelerate and enhance the general productivity of SA in terms of convergence reliability. Two general and complementary parameters, referred as "weighted Boltzmann parameter" and "critical Boltzmann parameter," are proposed, Several alternative methodologies are suggested for these two parameters. Numerical applications are presented to test the performance of the proposed techniques, and the results are compared with those that exist in the literature.


On the plane strain and plane stress solutions of functionally graded rotating solid shaft and solid disk problems
Eraslan, Ahmet Nedim (Springer Science and Business Media LLC, 2006-01-01)
Closed form solutions to functionally graded rotating solid shaft and rotating solid disk problems are obtained under generalized plane strain and plane stress assumptions, respectively. The nonhomogeneity in the material arises from the fact that the modulus of elasticity of the material varies radially according to two different continuously nonlinear forms: exponential and parabolic. Both forms contain two material parameters and lead to finite values of the modulus of elasticity at the center. Analytica...
Computational and experimental study of high-speed impact of metallic Taylor cylinders
Konokman, H. Emrah; Coruh, M. Murat; Kayran, Altan (Springer Science and Business Media LLC, 2011-08-01)
High-speed impact of metallic Taylor cylinders is investigated computationally and experimentally. On the computational side, a modular explicit finite element hydrocode based on updated Lagrangian formulation is developed. A non-classical contour integration is employed to calculate the nodal forces in the constant strain axisymmetric triangular elements. Cell and nodal averaging of volumetric strain formulations are implemented on different mesh architectures to reduce the incompressibility constraints an...
Implementation of physical boundary conditions into computational domain in modelling of oscillatory bottom boundary layers
Tiğrek, Şahnaz; Yılmaz, Bilgi (Wiley, 2010-11-30)
This paper discusses the importance of realistic implementation of the physical boundary conditions into computational domain for the simulation of the oscillatory turbulent boundary layer flow over smooth and rough flat beds. A mathematical model composed of the Reynolds averaged Navier-Stokes equation, turbulent kinetic energy (k) and dissipation rate of the turbulent kinetic energy (epsilon) has been developed. Control-volume approach is used to discretize the governing equations to facilitate the numeri...
Analysis of thin walled open section tapered beams using hybrid stress finite element method
Akman, Mehmet Nazım; Oral, Süha; Department of Mechanical Engineering (2008)
In this thesis, hybrid stress finite element is formulated for the analysis of the isotropic, thin walled, open section beams with variable cross sections. The beam element has two nodes each having seven degrees of freedom. Assumption of stress field is sufficient to determine the element stiffness matrix. Axial, flexural and torsional effects are taken into account in the analysis. The methodology can be applied both to the tapered and the uniform beams. Throughout this study, firstly element cross-sectio...
Thermal convection in the presence of a vertical magnetic field
Guray, E.; Tarman, H. I. (Springer Science and Business Media LLC, 2007-11-01)
The interaction between thermal convection and an external uniform magnetic field in the vertical is numerically simulated within a computational domain of a horizontally periodic convective box between upper and lower rigid plates. The numerical technique is based on a spectral element method developed earlier to simulate natural thermal convection. In this work, it is extended to a magnetoconvection problem. Its main features are the use of rescaled Legendre-Lagrangian polynomial interpolants in expanding...
Citation Formats
O. Hasançebi, “On efficient use of simulated annealing in complex structural optimization problems,” ACTA MECHANICA, pp. 27–50, 2002, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40695.