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Specific properties of phase characteristics of Distributed Mode Loudspeakers

Czesak Karol, Kleczkowski Piotr

Vibrations in Physical Systems

2023

Vol. 34, nr 2

art. no. 2023213

Distributed Mode Loudspeakers (DMLs) are characterized by a specific principle of operation, based on bending oscillations of a plate with a certain stiffness and dimensions. Because of this property DML produce a diffuse sound field in the proximity of the loudspeaker. In this work a series of phase characteristics measurements of a DML was carried out, which were compared with analogous ones, carried out for a conventional electrodynamic loudspeaker with a pistonic diaphragm. The elevations of measurement points were chosen in order to coincide with the most likely positions of a listener relative to the DML. A measurement on the axis of the transducer was also conducted. The results have demonstrated that the variability of phase value resulting as a function of frequency and localization of a measurement point is high. It may be concluded, that the DML is a non-minimum phase system, with some frequency regions of minimum phase behaviour. These regions are strongly dependent on the point of measurement.

Zastosowanie tyrystorowego zespołu napędowego dml do badania charakterystyk mechanicznych silnika asynchronicznego

Figura R., Kwiecień R., Szychta L.

Logistyka

2008

nr 6

CD-CD

W artykule przedstawiono sposób modelowania charakterystyk obciążenia silnika asynchronicznego klatkowego z wykorzystaniem tyrystorowego zespołu napędowego DML. Przedstawiono budowę stanowiska laboratoryjnego oraz zaprezentowano wyniki badań dla wybranych charakterystyk obciążenia silnika.

In the paper the modeling method of load characteristics of induction cage motor was presented. The method make use of thyristor drive units for DC motors. The laboratory stand was presented. The testing results for selected load character was shown.