Abstract
A new approach to laboratory acoustic experiments could remove unwanted effects caused by the reflections of acoustic waves from the boundaries of the experimental setup.
Highlights
In physical wave propagation experiments, a truncation of the domain on which the propagation is studied is inevitable
We demonstrate the feasibility of a physical implementation of immersive boundary conditions (IBCs) by presenting results of the first laboratory implementation of IBCs on one side of a 1D sound wave tube
To experimentally validate the feasibility of a physical implementation of IBCs, they are installed on one side of a 1D acoustic waveguide using a portion of the full-scale WaveLab system consisting of two National Instruments (NI) PXIe-7976R and two
Summary
In physical wave propagation experiments, a truncation of the domain on which the propagation is studied is inevitable. A second approach is to virtually expand the laboratory size by making the enclosing walls effectively transparent This can be achieved by passively attenuating the wave field at the boundaries using absorptive materials e.g., [9–12], as, for instance, in an anechoic chamber [13]. We present a fundamentally new laboratory for physical, real-time, acoustic immersive wave propagation experiments using active boundary control. It utilizes the recent idea of exact or immersive boundary conditions [22–24] to overcome the aforementioned size-related limitations and enables longwavelength, low-frequency wave propagation experimentation.
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