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D. Ritzberger, A. Schirrer, S. Jakubek:
"Absorbing boundary layer control for linear one-dimensional wave propagation problems";
Journal of Vibration and Control, (2016).

In this work, a boundary layer control scheme for one-dimensional wave propagation problems is presented that
provides reflection-less absorption of incident waves in numerical simulations. The desired absorption properties are
formulated as an optimization problem. By using the dispersion relation to predict the unbounded wave propagation as a
reference trajectory, a constant-gain state-feedback boundary layer controller is found. Since no additional auxiliary
variables are introduced, this approach is highly computationally efficient, making it suitable for simulations under realtime
requirements. The performance of the boundary layer controller is first evaluated and demonstrated on the scalar
wave equation (vibrating string), for which reference absorbing boundary conditions are well established. Afterward, the
moving Euler-Bernoulli beam under axial tension is considered, for which a good absorbing performance is achieved.

Absorbing boundary control, optimal control, axially moving materials, perfectly matched layer, transverse vibrations

http://dx.doi.org/10.1177/1077546316679579