A new method for separating an irregular, 2D wave field into incident waves propagating towards a structure and reflected waves propagating away from the structure is presented. The method is based on the use of digital filters and can separate the wave fields in real time. The efficiency of the method is demonstrated through numerical and physical tests. The method is very useful for comparisons of incident waves and structural response in the time domain. Furthermore, the method will be very useful in design of active wave absorbers.
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