PIPESOUND · Physical model of the sound generation in flue organ pipes
FP6 — Marie Curie Actions (Human Resources and Mobility)
- Duration
- 2006-04-01 → 2008-03-31
- EU contribution
- €213,522
- Participants
- 1
- Scheme
- IIF
Lines connect the coordinator with its partners.
Results in brief
Final Activity Report Summary - PIPESOUND (Physical Model of the Sound Generation in Flue Organ Pipes)
In a flue organ pipe, sound is generated as self-excitation. A feedback loop is made by the following processes: 1) an air jet coming out from a flue is oscillated by sound generated in the pipe; 2) a part of the flow with the jet enters the pipe and excites sound. Although process 2) is well understood, understanding of process 1) remains in an elementary stage. Only hypothetical models with many conceptual approximations were proposed. The main objective of this research is to understand process 1) better. To this end, computational fluid dynamical (CFD) simulation of a jet oscillated by sound was first carried out. From the results of the simulation, the amplitude and phase of the jet oscillation were then modelled empirically. To evaluate the model of the jet oscillation, flue pipe organ sound was synthesised in several different conditions using this model in physical modelling technique and was compared with sound generated in an actual flue organ pipe. Using a new jet oscillation model developed in this project and physical modelling sound synthesis, the following behaviours were simulated in satisfactory manners: A small change in the flue geometry greatly affects spectrum of the generated sound. This effect was reproduced correctly in the sound synthesis. When the air pressure supplied to a flue pipe is changed, various oscillation regimes in the first, second and third resonance modes appear. The number of the regimes, sound frequency and the pressure range for each regime were correctly simulated.
Data: CORDIS, © European Union
Project objective
The main objective of the research project is the development of a physical model of sound generation in flue organ pipes. This objective will be achieved by experiments on organ pipes and pipe models, by computer simulations and by the theoretical treatment of the problem.The main objective of the training of the researcher is to improve his skills on conducting, supporting and supervising experimental work and on working in teams with foreign researchers.The aims of the proposed research are the following:- Better understanding of the fluid dynamical and acoustical processes of sound generation in flue organ pipes- Development of a physical model of edge tone generation of flue organ pipes- Development of a physical model of the sound generation of air jet driven instruments based on the interaction of two closely coupled oscillating systems (edge tone and pipe tone).Application of the physical model for digital sound synthesis of wind instruments. The research is multidisciplinary, because different fields of physics and engineering are necessary to solve the problem of sound generation of organ pipes, such as fluid dynamics, physical and musical acoustics and structural vibrations. The perceived quality of the pipe sound can be described in the frame of psychoacoustics, while the digital synthesis of pipe sound requires knowledge in information technology and digital signal processing.The proposed Incoming International Fellowship would be beneficial for both parties. The researcher will have the possibility to perform sophisticated experiments on organ pipes and pipe models which are very similar to real organ pipes for developing a physical model of sound generation of labial organ pipes.The host institute will benefit from the knowledge of the researcher on Computational Fluid Dynamics simulation of air jets, and on sound synthesis using physical modelling techniques.
Original text from CORDIS.
Participants
- FRAUNHOFER GESELLSCHAFT ZUR FORDERUNG DER ANGEWANDTEN FORSCHUNG E.V.* · MÜNCHENCoordinatorGermany
Links
Data: CORDIS, © European Union