Dresden 2006 – scientific programme

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DY: Dynamik und Statistische Physik

DY 36: Nonlinear Dynamics, Synchronization and Chaos II

DY 36.5: Talk

Wednesday, March 29, 2006, 17:15–17:30, H\"UL 186

Synchronization of an aeroacoustical system — •Markus Abel, Karsten Ahnert, and Steffen Bergweiler — Universität Potsdam, 14469 Potsdam

A classical example of synchroniyation concerns the simultaneous sound emission of two organ pipes. We have measured the response of an organ pipe to an external source as well as the sznchroniyation properties of two organ pipes positioned side by side. We investigate two different questions. First, the mutual influence of two pipes with different pitch. In analogy to the coupling of two nonlinear oscillators with feedback, one observes a frequency locking, which can be explained by synchronization theory. Second, we measure the dependence of the frequency of the signals emitted by two mutually detuned pipes with varying distance between the pipes. The spectrum shows a broad “hump” structure, not found for coupled oscillators. This indicates a complicated aeroacoustical coupling of the two jets creating the acoustic field when exiting from the pipe mouth. We interpre the measurements in terms of a simplified model.