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DISCREPANCY IN SOUND POWER DETERMINATION AT LOW FREQUENCIES

  • 简介：Thedeterminationofthesoundpowerofasourceissimpleinareverberationchamber,butusuallylowervalvesareobtainedatlowfrequenciesthanthefree-spacevalue.Itisshownthatthesoundpowerdeterminedinareverberationchamberdependsnotonlyonitsfree-spacepower,butalsoonthepositionsofthesourceandthereveiver,aswellasthewaythemeasurementsaremadeandaveraged.Exactandstatisticalformulasarederivedtoaccountforthesefactors.Theresultsexplainthediscrepancyandagreewellwithearlierexperiments.Basedonthetheory,parcticabletechniquesofsoundpowerdetermina-tionarepropesedandcorrectpowerformulaspresented.

  • 标签： chamber averaged EARLIER EXPLAIN corrected FORMULAS
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Power flow transmission in a coupled flexible system with active executive elements

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Power flow transmission influenced by vibration source impedance for a compound system
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Forced vibrational power flow input and transmission in a fluid-filled shell

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Scanning paths for estimating sound power of noise sources by sound intensity scanning method

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Vibration power flow in infinite stiffened-plate with force excitation applied on plate

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Vibrational power flow analysis on combined plates partially covered layer of discontinuous material

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Measurement of acoustic field radiated by low frequency power ultrasonic transducer with laser-interferometer
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Power flows of three non-conservatively series-coupled oscillators, Part Ⅰ: Theory

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Power flows of three non-conservatively series-coupled oscillators, Part Ⅱ: Numerical analysis

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Passive sonar identification (Ⅲ): Feature extraction and pattern plates of double-frequency spectrum as well as average power spectrum

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Design theory and experimental investigation of the low frequency and high power rare earth magnetostrictive flextensional transducer (Ⅰ). Theoretical part

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Design theory and experimental investigation of the low frequency and high power rare earth magnetostrictive flextensional transducer (Ⅱ). Experimental part

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