Gesellschaft für Akustikforschung Dresden mbh Acoustic Engineering Dresden AED Acoustic Measuring Instruments & Analysis Software

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2 Gesellschaft für Akustikforschung Dresden mbh Acoustic Engineering Dresden AED Acoustic Measuring Instruments & Analysis Software

3 Overview Measuring Systems AcoustiFlow Airflow resistivity meter AcoustiAdrienne Sound absorption meter AcoustiTube Impedance tube AcoustiTube HighTemp Test setup for mufflers AcoustiCam Acoustic camera Application Software AcoustiCalc Absorber Sound absorber software AcoustiCalc Silencer Muffler software 3

4 Overview 4

5 Sound Absorption Meter AcoustiAdrienne 5

6 Sound Absorption Meter AcoustiAdrienne AED 800 determination of sound reflection index and sound absorption coefficient of noise barriers in situ according to DIN EN on the basis of the Adrienne method 6

7 Fields of Application quality control at noise barriers in situ right after installation process at noise barriers in situ after defined periods of presence (change of acoustic efficiency over time) optimization in research and development of noise barriers with respect to sound absorbing properties materials with open porosity structures and s, e.g. resonators 7

8 Physical Definition Measurement h1 (with specimen) S M r Amplitude direct reflected reflected (obstacle) h B d SM d M h S T W Time 9

9 Physical Definition Measurement h2 (free field) S M Amplitude direct d SM h S T W Time 10

10 Physical Definition Result of subtraction reflected Amplitude reflected reflected (obstacle) RI j = 1 n j n j k=1 f j 2 F t h r,k t w r,k t df C 2 geo,k C dir,k f j C gain,k f g F t h i,k t w i,k t f df j direct T W Time 11

11 D-SUB 25-pol BNC/ LEMO Measuring Setup Power supply Spring connector Amplifier Out 1-2 Cinch Data acquisition CH1 CHx LEMO USB PC Speakon Splitter box M1 M4 M2 M5 M8 M3 M6 M9 Noise barrier M7 Speaker Microphone arrangement 12

12 Analysis software AED 801 determination of sound reflection index and sound absorption coefficient as a function of frequency computation of single value DL RI 13

13 Sound Absorption Meter AcoustiAdrienne Extension to AED 810 determination of sound transmission index of noise barriers in situ according to DIN EN on the basis of the Adrienne method 14

14 Fields of Application quality control at noise barriers in situ right after installation process at noise barriers in situ after defined periods of presence (change of acoustic efficiency over time) optimization in research and development of noise barriers with respect to sound insulating properties materials with closed porosity light weight structures and s 15

15 Physical Definition Measurement h1 (with specimen) S t B M Amplitude transmitted diffracted and reflected (obstacle) h B d S d M h S T W Time 16

16 Physical Definition Measurement h2 (free field) S M Amplitude direct d S t B d M h S T W Time 17

17 Physical Definition Result transmitted SI j = 10 lg 1 n n k=1 f j f j F h t,k t w t,k t F h i,k t w i,k t 2 df 2 df db direct 18

18 D-SUB 25-pol BNC/ LEMO Measuring Setup Power supply Spring connector Amplifier Out 1-2 Cinch Data acquisition CH1 CHx LEMO USB PC Speakon Splitter box Noise barrier M1 M4 M2 M5 M8 M3 M6 M9 M7 Speaker Microphone arrangement 19

19 Analysis software AED 811 determination of sound transmission index as a function of frequency computation of single value DL SI 20

20 Sound Absorption Meter AcoustiAdrienne Extension to AED 820 determination of sound diffraction index (Miller index) and Miller index difference in situ according to DIN EN on the basis of the Adrienne method 21

21 Fields of Application quality control at noise barriers with crown elements in situ right after installation process at noise barriers with crown elements in situ after defined periods of presence (change of acoustic efficiency over time) optimization in research and development of crown elements for noise barriers with respect to sound diffracting properties materials with open porosity structures and s, e.g. resonators 22

22 Physical Definition Measurement h1 (with specimen) M S Amplitude transmitted diffracted diffracted and reflected (obstacle) h S d S h ref,0 / h ref,add d M T W Time 23

23 Physical Definition Measurement h2 (free field) M S Amplitude direct d S d M h ref,0 / h ref,add h S T W Time 24

24 Physical Definition Result diffracted DI j = 10 lg n k=1 f j f j F h d,k t w d,k t F h i,k t w i,k t 2 df 2 df db direct 25

25 D-SUB 25-pol BNC/ LEMO Measuring Setup Power supply Amplifier Out 1-2 Cinch Data acquisition LEMO USB PC Spring connector CH1 CHx Splitter box M1 / M6 M2 / M7 M3 / M8 Speakon Speaker Noise barrier with/ without M4 / M9 M5 / M10 Microphone arrangement crown element 26

26 Analysis software AED 821 determination of sound diffraction index (Miller index) as a function of frequency determination of Miller index difference as a function of frequency computation of single value DL DI,situ 27

27 Sound Absorption Meter AcoustiAdrienne Extension to AED 830 determination of sound reflection index and sound absorption coefficient of noise barriers in situ according to DIN CEN/TS on the basis of the Adrienne method 28

28 Sound Absorption Meter AcoustiAdrienne Extension to AED 830 determination of sound reflection index and sound absorption coefficient of road surfaces in situ according to DIN ISO (sound absorption coefficient > 0,15) on the basis of the Adrienne method 29

29 Sound Absorption Meter AcoustiAdrienne Extension to AED 830 determination of sound reflection index and sound absorption coefficient of plate-shaped absorbers in situ in the sense of DIN CEN/TS on the basis of the Adrienne method 30

30 Fields of Application quality control at noise barriers and road surfaces in situ right after installation process at noise barriers and road surfaces in situ after defined periods of presence (change of acoustic efficiency over time) plate-shaped specimens in the laboratory optimization in research and development of noise barriers, road surfaces and sound absorbers with respect to sound absorbing properties materials with open porosity structures and s, e.g. resonators 31

31 Physical Definition Measurement h1 (with specimen) R S d S M r h B Amplitude direct reflected reflected (obstacle) d SM d M h S 130 T W Time 32

32 Physical Definition Measurement h2 (free field) S M Amplitude direct d SM h S T W Time 33

33 Physical Definition Result of subtraction reflected Amplitude reflected reflected (obstacle) RI j = 1 n j n j k=1 2 F t h r,k t w r,k t f df j F t h i t w i t 2 df f j direct T W Time 34

34 BNC/ LEMO Measuring Setup Power supply Spring connector Amplifier Out 1-2 Cinch Data acquisition CH1 LEMO USB PC Speakon M1 Microphone Noise barrier Speaker 35

35 Analysis software AED 831 determination of sound reflection index and sound absorption coefficient as a function of frequency computation of single value DL RI 36

36 Gesellschaft für Akustikforschung Dresden mbh Acoustic Engineering Dresden AED Blumenstraße 80 D Dresden Contact: Dr.-Ing. Christian Schulze Managing Director Phone: Fax: christian.schulze@akustikforschung.de Web: