Abstract：The good performance of low frequency noise reduction contradicts the limited space of the intake system of the internal combustion engine. Aiming at this problem the acoustic performance of the series-wound system of multi-resonant silencer was studied. Based on the lumped parameter model of the resonant silencer, the formula of the main resonant frequencies of the series-wound system of multi-resonant silencer were deduced and verified.Study shows that the series-wound system of double-resonant silencer has two main resonant frequencies, as one is smaller than the bias frequency of the bottom resonant silencer, and the other one is bigger. Along with the volume ratio increasing, the smallerresonant frequency gets close to the bias frequency,whilethe bigger one gets away.The total volume needed in series-wound system is smaller than in parallel systemwhile length ratio = 1 and area ratio 1.When the structure parameters of theresonant silencers of the series-wound system are the same, the number of the main resonant frequencies equals to the number of the silencers.Based on theseconclusions,the intake system of a commercial vehicle was redesigned with the transmission loss below 200Hz increased by about 5dB over all.
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