Fast and Broadbanded Car Interior Panel Noise Contribution Analysis
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1 1 Fast and Broadbanded Car Interior Panel Noise Contribution Analysis Dr. Oliver Wolff, Open Technology Forum at Testing Expo Europe 2008, Stuttgart, 6 th 8 th May 2008
2 2 Contents Contents of presentation: Company history Working principle of sensor Product range Application examples References
3 3 Company history Working principle of sensor Product range of Microflown Application examples References
4 4 Company History 1994: Invention of the Microflown by Hans- Elias de Bree at University Twente 1997: Ph.D. Hans-Elias de Bree 1998: Founding Microflown Technologies B.V. ( de Bree, Koers ) 2001: Industrializing product 2003: Introduction broad banded Titan sensor element 2004: First application scientifically proven / first arrays sold 2005: Rapid growth in automotive industry 2005: De Bree appointed Professor Vehicle Acoustics at HAN University, College of Automotive Engineering ( 100 testing engineers/year) 2006: Strategic decision to penetrate the aerospace market 2007: 12 FTE company + 4 Ph.D. students, > 1 Million Euro turnover Participating in two EU FP 7 engine acoustic related projects, Flocon led by DLR Engine Acoustics and Teeni led by Turbomeca Leading IGOR consortium for JTI Clean Sky Green Rotorcraft
5 5 Company history Working principle of sensor Product range of Microflown Application examples References
6 6 Working Principle of Sensor Microflown SEM picture: two heated wires
7 7 Working Principle of Sensor The MEMS based Microflown sensor is based upon: a silicon material resisting 300 degrees Celsius just to carry two wires two extremely thin platinum wires heated about 200 Celsius above the ambient temperature to get enough sensitivity temperature difference is scientifically proven to measure acoustic particle velocity
8 8 Company history Working principle of sensor Product range of Microflown Application examples References
9 Product Line 9
10 10 Scanning Probe 1D Velocity For small objects
11 11 1 dimensional PU probes Particle Velocity Sound Pressure 1D sound intensity Impedance 1D sound energy
12 12 Microflown Package gain
13 13 3D USP probes usp, usp match, usp mini
14 14 Calibrators Sphere calibrator Short standing wave tube
15 15 Company history Working principle of sensor Product range of Microflown Application examples References
16 16 Application Examples 1) PU direct acoustic near field camera 2) 3-D Intensity Measurements 3) Acoustic Eye 4) End of line testing 5) Scan & Listen 6) Mini Acoustic Camera 7) In situ acoustic impedance 8) Car Panel Noise Contribution
17 17 1) PU direct acoustic near field camera 2) 3-D Intensity Measurements 3) Acoustic Eye 4) End of line testing 5) Scan & Listen 6) Mini Acoustic Camera 7) In situ acoustic impedance 8) Car Panel Noise Contribution
18 1. Acoustic camera 18
19 19 1. Acoustic camera User benefits Reliable acoustic particle velocity data Real time visualization of all relevant acoustic data One point methodology Full bandwidth Large dynamic range Low susceptibility to background noise Visualization of transients Free configuration of measurement grid Multi purpose tool Intuitive approach Much better than NAH and IBEM (a.o. JASA Paper by Finn Jacobsen)
20 20 1. Acoustic camera Each probe measures Sound Pressure and Particle velocity (and thus Intensity) in one spot Velocity and Intensity are directly determined, without complex mathematics Microphone opening Velocity Microflown Mini PU probe
21 21 1. Acoustic camera Sound radiation can be measured with just a single probe or with an array of probes Spacing between probes will not result in frequency limitations. So any probe grid configuration can be defined PU array with flexible grid
22 1. Acoustic camera 22
23 1. Acoustic camera Measuring with a portable setup inside the Eurocopter EC
24 24
25 1. Acoustic camera 25
26 1. Acoustic camera 26
27 27 1. Acoustic camera 1cm x 1cm spacing Sound leak finding End of line control Real time movies
28 28 1) PU direct acoustic near field camera 2) 3-D Intensity Measurements 3) Acoustic Eye 4) End of line testing 5) Scan & Listen 6) Mini Acoustic Camera 7) In situ acoustic impedance 8) Car Panel Noise Contribution
29 29 3-D Intensity Measurements Moving arrays of 3 D USP probes can be used for mapping of 3 D sound intensity streamlines Courtesy: Univ. Stettin
30 30 3-D Intensity Measurements 3D intensity probe
31 31 1) PU direct acoustic near field camera 2) 3-D Intensity Measurements 3) Acoustic Eyes 4) End of line testing 5) Scan & Listen 6) Mini Acoustic Camera 7) In situ acoustic impedance 8) Car Panel Noise Contribution
32 32 Conventional Test USP approach replacing large beamforming arrays, capturing simultaneously geometric position and acoustic data
33 33 Acoustic Eye Proven and presented at European Rotorcraft Forum Kazan, September 2007
34 34 1) PU direct acoustic near field camera 2) 3-D Intensity Measurements 3) Acoustic Eye 4) End of line testing 5) Scan & Listen 6) Mini Acoustic Camera 7) In situ acoustic impedance 8) Car Panel Noise Contribution
35 35 End of line testing Acoustic check of products Motors & Gears
36 36 End of line testing Audio example Background noise reduction Motors & Gears Good pump Wrong Pump No Pressure background noise Velocity Pressure Background noise Velocity
37 37 1) PU direct acoustic near field camera 2) 3-D Intensity Measurements 3) Acoustic Eye 4) End of line testing 5) Scan & Listen 6) Mini Acoustic Camera 7) In situ acoustic impedance 8) Car Panel Noise Contribution
38 Scan & Listen 38
39 39 Scan & Listen With the Scan and Listen device p and u can be heard directly Easy finding of modes Easy finding of sources Noise source finder Squeak & Rattle Portable Simple to use
40 40 1) PU direct acoustic near field camera 2) 3-D Intensity Measurements 3) Acoustic Eye 4) End of line testing 5) Scan & Listen 6) Mini Acoustic Camera 7) In situ acoustic impedance 8) Car Panel Noise Contribution
41 41 Mini Acoustic camera Miniature PU match Acoustic Camera
42 42 Mini Acoustic camera 1cm x 1cm spacing Sound leak finding End of line control Real time movies
43 43 1) PU direct acoustic near field camera 2) 3-D Intensity Measurements 3) Acoustic Eye 4) End of line testing 5) Scan & Listen 6) Mini Acoustic Camera 7) In situ acoustic impedance 8) Car Panel Noise Contribution
44 44 In situ acoustic impedance Principle
45 In situ acoustic impedance 45
46 46 In situ acoustic impedance Spherical loudspeaker Probe Reflecting material
![5mm L: 37mm [9,1]](/docs-images/88/117497479/images/47-8.jpg "[9,9] D: 5.")
47 47 In situ acoustic impedance High spatial resolution Sample with three quarter lambda resonators D: 5.5mm L: 37mm [9,1] [9,9] D: 5.5mm L: 62mm [1,9] D: 7mm L: 45mm [1,1]
48 48 1) PU direct acoustic near field camera 2) 3-D Intensity Measurements 3) Acoustic Eye 4) End of line testing 5) Scan & Listen 6) Mini Acoustic Camera 7) In situ acoustic impedance 8) Car Panel Noise Contribution
49 49 Car Panel Noise Contribution Step one: Measurement of all contributing sound sources 5 p
50 50 Car Panel Noise Contribution Reciprocity principle Step two: 5 p p 6 p 7 Q1 8 p 8 Using a true volume velocity source to determine the transfer path to the panels, using the reciprocity principle 4 p 4 p 3 p 2 p
51 51 Omnidirectional sources Car Panel Noise Contribution Low freq. source 30Hz-300Hz High freq. source 100Hz-6kHz
52 52 Car Panel Noise Contribution Head source: reciprocal counterpart of human hearing Low frequencies High frequencies
53 53 Car Panel Noise Contribution Measurements at PDE automotive
54 Car Panel Noise Contribution 54
55 55 Car Panel Noise Contribution ( Peugeot / Faurecia ) ( LMS / Eurocopter )
56 56 Company history Working principle of sensor Product range of Microflown Application examples References
57 References Automotive references: Audi, BMW, DaimlerChrysler, Dong Feng, Faurecia, Ford, Honda, Hyundai, Isuzu, Mazda, Muller-BBM, PSA Peugeot Citroen, Samsung Renault, Rieter Automotive, Stankiewiecz, Toyota, Volkswagen. Aerospace references: ADE Bangalore, Airbus France & Germany, DLR, Helmut Schmidt University, Univ. Compiegne, Univ. LeMans, Univ.Oldenburg, US Airforce 57
58 58 Are there any questions? We welcome you at our booth 1808.
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