Rotating Sound Sources - Inbetween Doppler Effect and Beating

Institut

Lehrstuhl für Akustik mobiler Systeme

Typ

Bachelorarbeit / Semesterarbeit / Masterarbeit /

Inhalt

theoretisch /  

Beschreibung

One of the most commonly known effect in acoustics is the socalled Doppler effect which is best experienced when an emergency vehicle is passing by while its sirens are active. Here, the sound waves are compressed when the vehicles is coming closer and stretched when the vehicles moves away. This results in time varying shift in frequency of the sound source. Now lets imagine the vehicle moves along a circle, while we position ourselves away from the axis of rotation at a certain distance, see the Figure to the right. In this case, we would experience the same Doppler effect as long as the source (blue dot) keeps revolving. However, if we add a number of similar sources equally spaced around this circle, it is not fully clear how the single sound waves of each source superimpose and whether this interaction leads to a beating sound experience at the receiver position (red dot). Therefore, this circumstance must be analyzed and understood in more detail. The results would close a gap between the Doppler effect and the beating effect. In this work, the student will improve her/his basic skills in literature research, programming (Matlab and/or Python), physical understanding of  wave propagation, and wave interaction as well as scientific writing. If outstanding results can be achieved, it is intended to publish the work in an international journal.

Voraussetzungen

High interest in cutting edge research
High interest in theory, sound, vibration, wave propagation
Solid knowledge of math and engineering mechanics

Möglicher Beginn

sofort

Kontakt

Dr.-Ing. Marcus Mäder
Raum: MW1535
Tel.: +49 89 289 55123
Marcus.Maedertum.de

Ausschreibung