Acoustics of Ducts and Mufflers With Application to Exhaust and Ventilation System DesignA complete presentation and analysis of the major topics in sound suppression and noise control for the analysis and design of acoustical mufflers, air conditioning and ventilation duct work. Both fundamentals and the latest technology are discussed, with an emphasis on applications. Deals with reactive mufflers, dissipative silencers, the frequency-domain approach, and the time-domain approach. |
Contents
PROPAGATION OF WAVES IN DUCTS 1 72 | 1 |
THEORY OF ACOUSTIC FILTERS | 42 |
AEROACOUSTICS OF EXHAUST MUFFLERS | 104 |
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A₁ Acous acoustic filter acoustic impedance acoustic pressure aeroacoustic amplitude area discontinuities attenuation constant B₁ B₂ boundary conditions C₁ calculated cavity characteristic impedance circular ducts configuration convective corresponding cylinder diameter downstream ejot entropy equations evaluation exhaust mufflers exhaust pipe exhaust system expansion chamber experimental Figure finite element finite wave analysis frequency function impedance tube inlet insertion loss internal combustion engine M. L. Munjal Mach number mass velocity mean flow measured method microphone mode moving medium muffler P₁ P₂ parameters particle velocity perforated element plane wave Poao Q₁ Q₁)² radiation impedance rectangular ducts reflection coefficient resonator S₁ shown in Fig solution Sound and Vibration source characteristics source impedance stagnation pressure stationary medium tail pipe temperature transfer matrix relation transmission loss upstream values variables wave number wave propagation Y₁ Y₂ yields ди др дх