Acoustic Tuning of an Anechoic Room

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Acoustic Tuning of an Anechoic Room

• Dr Jaroslaw Blaszczak
• Jaroslaw.Blaszczak_at_p.lodz.pl
• Institute of Turbomachinery/Technical University
  of Lodz

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Learning outcomes

• Enhance knowledge of EU law on environment
• Raise the level of knowledge in acoustics
• Develop an understanding of the correlation
  between flow and noise and methods of the noise
  reduction

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Project description - Intro

• More than 80 million of the EU citizens are
  exposed to the noise levels that scientists and
  health experts consider to be unacceptable
• Additional 170 million Europeans are seriously
  annoyed by the noise in their residential areas,
  especially during the daytime
• Through the years noise issue had lesser
  significance than air or water pollution. Now it
  is regarded as a serious health hazard, not just
  a nuisance

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Aeroacoustic chamberInstitute of Turbomachinery,
TU Lodz
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Rockfon Topaz sound absorption coefficient in
accordance with PN-83/B-02155 (ISO 354)Noise
Reduction Coefficient (NRC) in accordance with
American Standard ASTM C423
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Cross-sections with the limiting outlines ofthe
aeroacoustic chamber
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Ambient noise level inside aeroacoustic chamber
at he Institute of Turbomachinery TU Lodz
compared to NASA Langley chambers
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Directivity measurement results and comparison
with the inverse square law
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Project description - Goals

• The first task of the project is to check the
  acoustic characteristics of the existing anechoic
  room
• The project will be realised basing on
  experimental tests performed at the unique
  aerodynamic anechoic room at the Institute of
  Turbomachinery with high-end measuring equipment
• The main task will be anechoic room tuning by
  improvement of its acoustic characteristics
• Calculations of costs of the proposed method and
  some other benefits are also to be considered.

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Microphone BK type 4190 / Preamplifier BK 2669C
/ ENDEVCO, accelerometer ISOTRON type 752A12
BK Puls 3560B
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Project team

• The project requires competence in the following
  fields
• q       Mechanical Engineering
• q       Computer Science
• q       Business Studies
• q       Electronic Engineering
• q       Electrical Engineering
•  
• The project includes the elements of the
  following fields
• q       Mechanical Engineering
• q       Computer Science
• q       Business Studies
• q       Electronic Engineering
• q       Electrical Engineering

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Form of assessment

•  Continuous assessment by the project supervisor
•  Mid-term evaluation by the panel of assessors
•  Final evaluation
• - project presentation
• - report in hard and soft copy
• - self and peer assessment

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Thank you for your attention
http//www.imp.p.lodz.pl Jaroslaw.Blaszczak_at_p.lodz
.pl