ENSAERO [1], is a multidisciplinary code for computing the unsteady flow and associated aeroelastic responses of aerospace vehicles. The code simultaneously integrates the time-dependent Euler or thin-layer, Reynolds-averaged Navier-Stokes equations and the structural equations of motion using aeroelastically adaptive dynamic grids. The code can predict static and dynamic response for flexible ...

Theoretical foundations for estimating gravity equations were enhanced recently in Anderson and van Wincoop (2003). Though elegant, the model assumes symmetric bilateral trade costs to generate an estimable set of structural equations. In reality, however, trade costs (and trade flows) are not bilaterally symmetric. To allow for asymmetric bilateral trade costs, we provide an alternative framew...

The paper deals with structural optimization of biomorphic microcellular ceramics invoking an elasto– plasticity with the von Mises yield criterion in the macroscopic model. The return mapping algorithms introduced by Simo and Ortiz in 1985 are applied for the numerical solution of the problem. The latter methods are computationally effective, robust and stable, and have recently become the mos...

Based on Navier-Stokes equations and structural and flight dynamic equations of motion, dynamic responses in vertical discrete gust flow perturbation are investigated for a supersonic transport model. A tightly coupled method was developed by the subiteration between aerodynamic equations and dynamic equations of motion. First, under the assumption of rigid-body and single freedom of motion in ...

State space equations that constrain the values of related variables within individual states are often used in models of continuous dynamical systems such as ordinary differential equations . These models do not allow the representation of non-local information constraining the behavior of the system across time except through the application of continuity . Qualitative simulation (Kuipers, 19...

This paper formulates dynamic R&D investment decisions of private firms as an optimal stochastic control problem. It derives explicitly R&D investment decision rule and the cross equations parameter restrictions imposed by the rational expectations hypothesis, using the Riccati equations only and not requiring the use of Wiener-Kolmogorov prediction formula. Identification and estimation of the...