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Abstract: The
mechanism of the high-frequency pressure oscillation and its effect on
combustion noise are studied. The appearance ranges of the
high-frequency pressure oscillation are defined by the method of the
wavelet analysis and the corresponding crankshaft angle ranges of the
chamber cavity model also are obtained. The acoustic model of the
chamber cavity with different crankshaft angle is tested by the acoustic
response method and computed by the finite element technique. Both the
results of the calculated and tested are modified by corresponding
crankshaft angle temperature and they are practically equal. The
combustion pressure and noise are studied by the test parameters. The
results show that the high-frequency pressure oscillation is aroused by
the combustion chamber’s several ranks resonance. The high-frequency
oscillation of combustion pressure is the important effect factor of the
combustion noise.
Key
words: Internal
combustion engine Wavelet analysis Combustion pressure High-frequency
pressure oscillation
CLC No: TK421.6
国家自然科学基金资助项目(50176034)和教育部科学技术研究重点项目(03049). Received 20030907, received
in revised form 20040320
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