Microphone Arrays for Aeroacoustic Measurements

June 4 - 6, 2018, Göttingen

Weitere Informationen finden sie unter - Further information are available under - http://maamcourse.dlr.de/

News

The third MAA|AM course will take place at DLR in Göttingen from June 4th, 2018 to June 6th. The registration is open. We are looking forward to your participation.

The second MA|AM Course at DLR in Göttingen took place in May 2016 with 30 participants from seven different countries.

Due to positive feedback from the participants of the last courses the MA|AM course will continue to take place every two years.

Purpose of the Course

Aim of this course is to improve the knowledge for the practical application of microphone array measurements in wind tunnels, including the post-processing and the interpretation of the achieved results. Test engineers can participate to obtain the necessary knowledge to improve the quality of aeroacoustic measurements with microphone arrays and prevent costly errors. Contractors and end-users of array measurement results will learn how to assess the potential of aeroacoustic wind tunnel measurements and how to interpret the achieved results appropriately.

Acoustic source map of a Dornier DO-728 half model in DNW-KKK

In this course a knowledge base regarding the necessary theoretical background, practical knowledge about the hardware requirements and the potential of post processing will be taught. The theoretical part will concentrate on those aspects of aeroacoustics relevant to microphone array measurements. Besides giving lectures on the fundamental aspects, special emphasis will be placed on solutions of the practical problems which are faced during the implementation of this technique in wind tunnels. During practice the participants will have the opportunity in small groups to carry out recording and valuation of data, with special emphasis being given to the impact of experimental settings on the beamforming results. The post processing and particularly the various deconvolution algorithms, including their advantages and disadvantages, will be explained and demonstrated.

Who should attend?

This course is mainly intended for engineers and scientists who already have basic knowledge of acoustics or aeroacoustics and already work or will work with microphone arrays or with the results of microphone array measurements in industrial or scientific applications.

Besides this, the course is intended for engineers who need to understand the possibilities and limitations of microphone array measurements.

During the course many problems arising in aeroacoustic measurements and microphone arrays will be treated - in theory as well as in practice.

Course Outline 2018

The course runs from Monday (June 4, 2018) to Wednesday (June 6, 2018). All presentations are given in English. Registration will begin at 8:15 on Monday, in the DLR School Lab (Building 6).

The course was divided in half day lectures and practices. Each course day included a one hour lunch break and coffee breaks. The lectures on Thursday covered a demonstration experiment.

Monday, June 4, 2018 (08:15-18:00)

Registration (08:15-09:00)
Welcome, division into groups
Fundamentals: signal processing, aeroacoustic sources and wave propagation, beam-forming, array design, steering vectors
Practice
Welcome Party at DLR (18:30)

Tuesday, June 5, 2018 (09:00-18:00)

Application: aeroacoustic source models, measurements in open and closed test sections, data analysis, hardware requirements, installation of measurement equipment in wind tunnels
Practice
Dinner at restaurant Bullerjahn (19:30)

Wednesday, June 6, 2018 (09:00-16:30)

Practice
Advanced techniques and applications: deconvolution, shear layer correction, boundary layer effects, Reynolds number effects, hydrodynamical and acoustical pressure fluctuations
Final discussion

Practice:

Closed test section: background noise, diagonal removal, reflections, flow correction, directivity, typical errors
Open test section: hay stacking, turbulent scattering, identification ofg aeroacoustic sources, 3D beamforming
Array properties in aeroacoustics: shear layer correction, array layout, point spread function, calibration of microphone positions
Demonstration: application and characteristics of deconvolution algorithms, post-processing, discussion

Key Lecturers 2018

Prof. Robert Dougherty, Optinav Inc./University of Washington, USA
Dr. Klaus Ehrenfried, DLR, Germany
Dr. Lars Koop, DLR, Germany
Prof. Ennes Sarradj, Technische Universität Berlin, Germany
Dr. Pieter Sijtsma, Advanced AeroAcoustics (PSA3), The Netherlands
Dr. Carsten Spehr, DLR, Germany

Course Registration

Early registration is strongly recommended due to the limited space available in the laboratory.

The registration fee of 1480 € (for DLR/DNW employees: 1095 €) includes course notes, lunches and refreshments during the course, the Monday welcome party and the Tuesday evening dinner.

A cancelation fee of 400 € will be charged from registered persons who cancel their participation after May 4th, 2018.

The fee for participation is free of VAT as far as the German Umsatzsteuergesetz (UStG) is concerned. The organizers reserve the right to cancel the course in case of too few participants.

Payments are to be made by credit card or bank transfer.

After registration you will receive immediately an E-mail confirming your participation in the course and containing an invoice with further information on the methods of payment.

Clich here for registration.