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Application of the Wave Based techniques for steady-state semi-infinite sound radiation analysis

Rejlek J., Pluymers B., Hepberger A., Priebsch H.-H., Demset W.

Computer Assisted Mechanics and Engineering Sciences

2008

Vol. 15, No. 3/4

337-351

This paper reports on the development of a novel wave based prediction technique for the steady-state sound radiation analysis of three-dimensional semi-infinite problems. Instead of simple polynomial shape functions, this method adopts an indirect Trefftz approach, in which it uses the exact solutions of the governing differential equation for the field variables approximation. Since a fine discretization is no longer required, the resulting wave based models are substantially smaller than the element-based counterparts. Application of the proposed approach to various validation examples illustrates an enhanced computational efficiency as compared with element-based methods.

Application of a hybrid finite element --- Trefftz approach for acoustic analysis

Pluymers B., Vanmaele C., Desmet W., Vandepitte D.

Computer Assisted Mechanics and Engineering Sciences

2006

Vol. 13, No. 3

427-444

This paper reviews a wave based prediction technique for steady-state acoustic analysis, which is being developed at the K.U. Leuven Noise and Vibration Research group. The method is a deterministic technique based on an indirect Trefftz approach. Due to its enhanced convergence rate and computational efficiency as compared to conventional element based methods, the practical frequency limitation of the technique can be shifted towards the mid-frequency range. For systems of high geometrical complexity, a hybrid coupling between wave based models and conventional finite element (FE) models is proposed in order to combine the computational efficiency of the wave based method with the high flexibility of FE with respect to geometrical complexity of the considered problem domain. The potential to comply with the mid-frequency modelling challenge through the use of the wave based technique or its hybrid variant, is illustrated for some three-dimensional acoustic validation cases.

Optimal placement and sizing of distributed generator units using genetic optimization algorithms

Haesens E., Espinoza M., Pluymers B., Goethals I., Thong V. V., Driesen J., Belmanss R., Moor B. de

Electrical Power Quality and Utilisation. Journal

2005

Vol. 11, nr 1

97-104

In this article the authors describe how genetic optimization algorithms can be used to find the optimal size and location of distributed generation units in a residential distribution grid. Power losses are minimized while the voltage profile is kept at an acceptable level. The method is applied on a system based on an existing grid topology with production and residential load data based on measurements. Different scenarios are chosen to run the algorithm. The obtained optimal location and size prove to depend strongly on the given conditions.