Active wave absorption method for force-controlled wavemakers based on amplitude–phase fitting
Year: 2026
Type: article
Abstract: Reflected waves at flume boundaries adversely affect the accuracy of wave simulation experiments, motivating the development of active absorption techniques. The absorption methods of force-controlled wavemakers, however, remain limited due to the complexity of their transfer functions. This study first derives the absorption transfer functions of piston-type and flap-type wavemakers in the frequency domain based on force control, and then uses them to design an active absorption system based on infinite impulse response (IIR) filters. A filter with the appropriate design is derived by fitting the magnitude and phase responses to the transfer function by using the least-squares method for the frequency domain. Numerical results show that the proposed IIR filter can absorb waves over a wide range of frequencies, especially in the 0.3–1.4 Hz band, with an efficiency exceeding 95%. Compared with a method proposed in previous studies, the proposed filter delivers significantly improved absorption performance in the high-frequency range. Validation under regular and irregular wave conditions demonstrates that the proposed active absorption system for force-controlled wavemakers not only achieves high absorption efficiency in good agreement with theoretical predictions, but also exhibits satisfactory robustness to noise interference and maintains stable performance during long-duration operation.
Source: Applied Ocean Research
Language: English
Topic: Coastal and Marine Dynamics
Subfield: Earth-Surface Processes
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,950
Award: G4059744830
OpenAlex ID: W7225431570