Development of a dynamic pressure generator based on a loudspeaker with improved frequency characteristics

This paper presents the development and analysis of a measurement system with a dynamic pressure generator that is designed for the purpose of investigating the frequency characteristics of pressure connecting tubes. The developed dynamic pressure generator (DPG) consists of an electrodynamic loudspeaker that generates stable and adjustable sinusoidal pressure pulsations inside the air chamber within the generator housing. As the frequency characteristics of the DPG are defined by the properties of the loudspeaker diaphragm, the air chamber and the connections of the reference pressure sensor to the DPG, the DPG dimensions were optimized with the help of physical-mathematical modeling. Experimental analysis of the developed DPG, which enables flush mounting of the reference pressure sensors, showed improved amplitude and phase-frequency characteristics in comparison with the previous configuration of the DPG based on two loudspeakers.