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Study on the Correlation between the Heat Release Rate and Vibrations from a Diesel Engine Block
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2015 by SAE International in United States
Annotation ability available
In this study, a correlation between the maximum heat release rate and vibrations from a diesel engine block was derived, and a methodology to determine the maximum heat release rate is presented. To investigate and analyze the correlation, an engine test and an actual road vehicle test were performed using a 1.6-L diesel engine. By varying the engine speed, load and main injection timing, the vibration signals from the engine block were measured and analyzed using a continuous wavelet transform (CWT).
The results show that the maximum heat release rate has a strong correlation with the magnitude of the vibrations. A specific bandwidth, the vibration signals between 0.3∼1.5 kHz, was affected by the variation in the heat release rate. The vibrations excited by combustion lasted over 50 CAD; however, the signals during the period of 35 CAD after the start of injection had a dominant effect on the maximum heat release rate. The coefficients of the CWT were integrated between the 0.3∼1.5 kHz band during 35 CAD after the start of the main injection. The results show that the integrated value is proportional to the maximum heat release rate. As a result, the maximum heat release rate can be estimated using the correlation.
CitationLee, S., Lee, Y., Lee, S., Song, H. et al., "Study on the Correlation between the Heat Release Rate and Vibrations from a Diesel Engine Block," SAE Technical Paper 2015-01-1673, 2015, https://doi.org/10.4271/2015-01-1673.
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