Laboratory Services Measurements: Analysis: Bruel&Kjaer Impedance Tube Measurements Sound Absorption Coefficient Sound Transmission Loss (dB) Vibration.

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Presentation transcript:

Laboratory Services Measurements: Analysis: Bruel&Kjaer Impedance Tube Measurements Sound Absorption Coefficient Sound Transmission Loss (dB) Vibration Measurements Alpha Cabin Tests (Including Sound Transmission Loss) Acoustic Performance Analysis Optimization and Sensitivity Analysis Inverse characterization

Bruel&Kjaer Impedance Tube Measurements Measurement of Acoustic Performances using Impedance Tube: Sound Absorption Coefficient Sound Reflection Coefficient Impedance Ratio Admittance Ratio Sound Transmission Loss Measurements

Measurement Limitations  Frequency range: 50Hz- 6,4kHz  Homogeneous material  Flat-surface material  Only plane waves can propagate in the impedance tube a b a.Assembly for Sound Absorption Measurements, ISO b.Assembly for Transmission Loss Measurements, (ISO ) Measurements Bruel&Kjaer Impedance Tube Measurements

Vibration Measurements Measurements

Alpha Cabin Measurements The working princible of Alpha Cabin Sabine Formula α : Sound Absorption Coefficient V: Room Volume A s : Surface Area of the Material » = Measurements

Alpha Cabin Measurements Measurement Limitations  Frequency range : 400Hz-10kHz  Homogeneous/Nonhomogeneous Material  Flat-surface/Nonflat-surface Material  Sound Waves impact the material on every angles  Malzemenin Akustik empedansı ve Yüzey empedansı ölçülemez Design of Alpha Cabin with Two Rooms Measurements

Comet Trim: Performance Analysis Acoustic performance is governed by macroscobic material properties and geometric properties Modified Biot’s theory establishes a relationship between material, geometric properties and acoustic performance Evaluation of Acoustic Performance Analysis

Comet Trim: Performance Analysis Family of Layers Modeled in Trim Analysis

Comet Trim: Optimization and Sensitivity Analysis Evoulate the sensitivity of acoustical performance with respect to macroscobic properties Values above the axis: Performance will increase when the design parameter is increased Values below the axis: Performance will decrease when the design parameter is increased Design Sensitivity: An Example Analysis

Comet Trim: Optimization and Sensitivity Analysis Optimize macroscobic properties for desired acoustical performance Analysis

Comet Trim: Inverse Characterization Estimate the macroscobic properites based on measured acoustical (transmission loss and/or absorption) data Analysis

Overview of Our Laboratory

Contact Information Ufuk UZUNDA Ğ R&D Executive FORMplast YALITIM BANTLARI SAN. VE TİC.LTD.ŞTİ. GEPOSB İNÖNÜ MAH.BALÇIK YOLU ÜZERİ GEPOSB İÇİ ATATÜRK BLVR NO:7 GEBZE - KOCAELİ / TURKEY Phone : Ext: 148 FAX : MOBILE: WEB : Laboratory Executive: