Acoustic standing waves are excited in internal combustion chambers by both normal combustion and autoignition. The energy in these acoustic modes can be transmitted through the engine block and radiated as high-frequency engine noise. Using finite-element models of two different (four-valve and two-valve) production engine combustion chambers, the mode shapes and relative frequencies of the in-cylinder volume acoustic modes are calculated as a function of crank angle. The model is validated by comparison to spectrograms of experimental time-sampled waveforms (from flush-mounted cylinder pressure sensors and accelerometers) from these two typical production spark-ignited engines.
The Volume Acoustic Modes of Spark-Ignited Internal Combustion Chambers
Sae Technical Papers
International Congress & Exposition ; 1998
1998-02-23
Aufsatz (Konferenz)
Englisch
The volume acoustic modes of spark-ignited internal combustion chambers
Kraftfahrwesen | 1998
|Some Experience With High Compression Ratio Compact Spark Ignited Combustion Chambers
SAE Technical Papers | 1984
|Some experience with high compression ratio compact spark ignited combustion chambers
Kraftfahrwesen | 1984
|Lean combustion in spark-ignited internal combustion engines A review
Kraftfahrwesen | 1983
|Lean Combustion in Spark-Ignited Internal Combustion Engines - A Review
SAE Technical Papers | 1983
|