Presentation on theme: "J. Stuart Bolton Ph.D. Institute of Sound and Vibration Research, Southampton University, UK. Poroelastic materials and applied signal processing Professor."— Presentation transcript:
1 J. Stuart BoltonPh.D. Institute of Sound and Vibration Research, Southampton University, UK.Poroelastic materials and applied signal processingProfessor of Mechanical EngineeringWave propagation and sound radiationSound Field visualizationPoroelastic materialsNoise ControlAmericas Editor (with Patricia Davis) of the Journal of Sound and VibrationFunding from: 3M, Sony, Cummins Engines, Boeing, Raytheon Aircraft . . .
2 Optimization of Acoustic Treatments 3 foams , 2 air space, 3 panelFOAM123AIRPanel 2Panel 3Panel 1Incidence 1TcTransmittedReflection RcArea IZ=0Z=L1Z=L2L3IIL4L5IIIIVVVIVIIHoneycomb panelsolve forArea IIArea IVPanel motionArea VArea IIIArea VIArea VIIApply b.c.’s at each interface
4 Component Noise: e.g. Tire Radiation Analysis Procedure SPL & Sound Intensityon a hemispheresurrounding a tire[ Direct BEM ]radiation field characteristicsbased on Acoustic Radiation Mode(Acoustic Transfer Vector)Sound PowerRadiation EfficiencyRadiation Mode Contribution[ Structural Harmonic FEM ]structural wave propagationbased on surface normal velocities
5 Acoustical Holography for Noise Source Identification: e. g Acoustical Holography for Noise Source Identification: e.g. rolling tire at 21 mph (128 Hz)n 3Frequency# of nodes164 Hz8 (n=4)140 Hz6 (n=3)115 Hz4 (n=2)From Dispersion Curve