Study on the Correlation between the Heat Release Rate and Vibrations from a Diesel Engine Block

Paper #:
  • 2015-01-1673

Published:
  • 2015-04-14
DOI:
  • 10.4271/2015-01-1673
Citation:
Lee, 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.
Pages:
7
Abstract:
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.
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