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ATTENUATION OF SOUND AND VIBRATIONS
Transmission loss from a vibrating body to a rigid
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abscissa acoustic ohms acoustic power output acoustic reactance acoustic resistance acoustic watts air gap flux air load ampere turns assumed attenuated centimeters chart 55 Chart Chart Chart circular piston mounted controlled mechanical system copper wire curve marked curves indicate cut-off frequency CYCLES CHART Decibel diameter in inches diameter over wavelength distance dotted curves dynes effective mass equal exponential horn family of curves field power Find the acoustic find the intersection flux density FREQUENCY IN CYCLES gauss hand ordinate scale horn loud speaker impedance increase infinite baffle mass controlled mechanical ohms multiply normal axis numbers particle displacement particle velocity peak amplitude phase angle piston diameter piston mass radiation resistance read the intersection resonance frequency reverberation ring diameter Sample Problem Find second harmonic small compared sound being radiated sound pressure stiffness throat area tube various frequencies various ratios vibrating system voice coil mass wavelength of sound