Browse Publications Technical Papers 2019-01-1482

Development of a Muffler Insertion Loss Flow Rig 2019-01-1482

Mufflers and silencers are commonly used to attenuate noise sources such as internal combustion engines and HVAC systems. Though the transmission loss of a muffler sans flow is relatively simple to obtain using the two-load method, the presence of mean flow modifies the muffler behavior. The development of an insertion loss test rig is detailed. A blower produces the flow and an upstream silencer quiets the flow before it enters the muffler. Loudspeakers are positioned just downstream of the silencer and they are used as the sound source. The measurement platform allows for the measurement of flow-induced noise in the muffler. In addition, the insertion loss of the muffler can be determined, and this capability was validated by comparison to a one-dimensional plane wave model.


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