Recent developments by the author in the application of digital Fourier transform (DFT) methods, i.e., coherence and transfer function techniques to the investigation of noise from an engine are discussed. The transfer functions are determined emipirically and they can be used to determine the mechanism of noise generation of an engine. They can also be used to predict the effect on engine noise of various assumed cylinder pressure wave forms. Among other results, it is demonstrated that the rapid pressure rise in the cylinder pressure has a strong effect on engine noise.
The use of digital Fourier transform methods in engine noise research
Anwendung der digitalen Fourier-Transformation bei der Motorengeraeuschforschung
SAE-Papers ; 1-10
1977
10 Seiten, 10 Bilder, 1 Tabelle, 11 Quellen
Aufsatz (Konferenz)
Englisch
The Use of Digital Fourier Transform Methods in Engine Noise Research
SAE Technical Papers | 1977
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