The development of an approximate acoustic point source for acoustics testing.

摘要

The point source is a powerful modeling tool in many scientific and engineering fields. In acoustics, the point source is an infinitesimal object that displaces the surrounding fluid equally in all directions. The point source is a powerful modeling tool because in linear systems analysis, which includes acoustics, the principle of superposition allows complex sources of excitation to be modeled by a collection of simple sources, or point sources. The point source can also be a powerful tool in experimentation, and models which use simple sources can be more easily verified. A physical approximation to a point source for experimental work is developed here. The acoustics theory dealing with point sources is discussed, and acoustic intensity is introduced. The acoustic exciter is presented, and the physics of the exciter are compared with the physics of the point source. An analytical model is developed for design optimization and source calibration. The experimental techniques used in the model verification and parameter identification are presented. Sound intensity comparisons with conventional speakers clearly show that the acoustic exciter is an excellent approximation to the point source.