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Monday, July 8 • 16:30 - 16:50
PREDICTIVE TOOLS INTEGRATION TOWARDS MEETING EXHAUST SYSTEM DESIGN CHALLENGES IN COMPACT HIGH POWER DENSITY VEHICLES

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The increasing demand for high performance recreational vehicles combined with more stringent noise regulations and customer expectations lead to intake and exhaust systems design challenges, namely in-creased mass flow rate, reduced pressure losses and reduced space available for silencing devices along with shortened development cycles. Design choices must be made carefully to reach the performance targets while having the desired attenuation on harmonic noise related to combustion cycles without in-ducing excessive pressure losses and flow noise levels. Usage of predictive tools in conjunction with vali-dation testing is becoming paramount to guide the design of such high-performance exhaust silencing de-vices. A discussion regarding the available simulation methodologies is presented with the associated pros and cons. All these approaches are widespread and well documented on four-stroke automotive engines, but additional challenges arise with high performance two-stroke engines, such as non-linear behavior of perforations due to grazing flow and high acoustic amplitude in addition to extended frequency range of noise predictions. Despite these new challenges, usage of simulation tools in product development al-lowed to identify the root cause of a problematic resonance in an exhaust silencer and to define 2 differ-ent strategies to mitigate it. One of the two design alternatives was finally selected and successfully im-plemented in a mass production consumer product.


Monday July 8, 2019 16:30 - 16:50 EDT
Outremont 6
  T15 Road & rlway noise & vibr., SS02 Vehicle noise vibr & harshn