Now showing items 261-265 of 265
Numerical Optimization Using Computer Experiments
Engineering design optimization often gives rise to problems in which expensive objective functions are minimized by derivative-free methods. We propose a method for solving such problems that synthesizes ideas from the ...
Computational Experience of an Augmented Lagrangian for Nonlinear Programming as a Merit Function in a Primal-Dual Interior-Point Method
In this paper we extend the L² augmented Lagrangian function from equality constrained problems to nonlinear programming problems. The augmentation is strongly influenced by interior-point philosophy. Only information about ...
Numerical Techniques for the Treatment of Quasistatic Solid Viscoelastic Stress Problems
For quasistatic stress problems two alternative constitutive relationships expressing the stress in a linear viscoelastic solid body as a linear functional of the strain are derived. In conjunction with the equations of ...
Gradient Calculation of the Traveltime Cost Function Without Ray-Tracing
The inverse problem of tomography is an iterative procedure. It requires the computation of the gradient of the traveltime misfit cost function many times. This calculation is customarily done by ray tracing, the path ...
Simultaneous Determination of the Source-Time Function and Reflectivity via Inversion
No attempt to uncover the desired mechanical properties of the earth will be successful in reflection seismology without an accurate estimate of the source term in the wave equation model. In this paper we argue for using ...