Updating a finite element model to the real experimental setup by thermographic measurements and adaptive regression optimization

Abstract

a b s t r a c tShock focusing in water is a phenomenon that can occur during the impact of a shock wave generated by an underwater explosion onto any type of convergent marine structures. To predict the dynamic material response of the marine structure, it is important to understand the shock wave dynamics during the focusing event. In this paper, both experimental investigations and numerical studies of twodimensional shock focusing in water are presented. Here, a convergent geometry given by a logarithmic spiral curve is used to focus the shock waves. In the experiments, the interaction between three types of materials and the shock wave in water is explored by using high-speed photography. Distinct features of such flows are unveiled. Three scenarios have been considered in simulations: a rigid structure where only the water-filled region is taken into account, a fluid-structure interaction problem in which the surrounding material responses are included, and an axisymmetric simulation to determine the threedimensional effects.

From Thermal Inspection to Updating a Numerical Model of a Race Bicycle: Comparison with Structural Dynamics Approach

“…Both the quality of the experimental data and the FE model data will contribute to the evolution of the optimization algorithm. The implemented optimization algorithm is based on the adaptive response surface method described in [24]. With respect to modal analysis updating, the original optimization routine is used, developed by Steenackers et al [27].…”

“…The optimization routine makes use of adaptive response surface optimization to optimize numerical models based on a multitude of measured data points. The routine is designed to handle multiple-output time series data for the thermal case and frequency data for the modal case [24,27]. The optimization procedure can be divided into the following steps:…”

“…These updating methods are widely used in structural dynamics for modal vibration inspection [14,[18][19][20][21][22], but their use is limited in heat transfer optimization problems related to non-linear convection and radiation boundaries [23,24]. FE model updating can be used to optimize the complex parameter set of active thermographic setups by correlating the numerical results with NDT data [25].…”

“…FE model updating can be used to optimize the complex parameter set of active thermographic setups by correlating the numerical results with NDT data [25]. These methods are widely used in modal vibration inspection [20][21][22], but their usage is limited in thermal optimization problems [4,23,24] due to the difficulties in estimating the diffusivity.…”

From thermal inspection to updating a numerical model of a race bicycle

“…On the other hand, computer simulation and virtual modelling tools are an economical and fast way to determine and simulate material behaviour. The next step in integrating the non-destructive PT tests and virtual modelling is the updating of the FE model [3], [4]. Computer simulations are economically interesting and a fast way to determine and simulate material behaviour and to calculate worst case scenarios.…”