Abstract
Simplified scale models are shown to be useful for determining the low-frequency sound transfer properties of an exhaust system of a large low speed marine diesel engine. Experimental results of a full-scale system including silencers closely agree with model results. Ways of constructing, simplifying and investigating the models are indicated.
Resistance modelling is discussed.
A practical example of calculating the exhaust sound pressure level on a bridge wing due to a typical two-stroke six-cylinder engine with two turbo-superchargers and symmetrical exhaust is treated extensively.
Remaining problems are summarized.
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