Lecture 4

Lecture 4 - B M E 4 5 0 0 / 6 5 0 0 F a l l 0 9...

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Unformatted text preview: B M E 4 5 0 0 / 6 5 0 0 F a l l 0 9 Fundamentals of Sound Fundamentals of Sound s Sound waves (pressure disturbances) are transmitted through the medium by means of a chain reaction. ropagation speed depends on 9/17/2009 1 s Propagation speed depends on physical properties of the medium: s Density ( ) [ Kg/m 3 ] s Stiffness: s Y Youngs modulus in solids. s K bulk modulus in fluids [ Pa ]. K c = s m c air / 331 s m c water / 1500 B M E 4 5 0 0 / 6 5 0 0 F a l l 0 9 Bulk modulus Bulk modulus K (for fluids) (for fluids) s Measures the resistance to uniform compression. s K defined as pressure increase needed to produce a given relative decrease in volume. he greater the K, the lower the 9/17/2009 2 s The greater the K, the lower the deformation ( i.e. the fluid is less compressible). V P V K o - ) ( . adiabatic Pa x K air 5 10 42 1 Pa x K water 9 10 2 2 . B M E 4 5 0 0 / 6 5 0 0 F a l l 0 9 Sound Pressure and SPL Sound Pressure and SPL s Sound Pressure:...
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Lecture 4 - B M E 4 5 0 0 / 6 5 0 0 F a l l 0 9...

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