Abstract
Ship black carbon emissions have caused great harm to ecological environment. In order to estimate the black carbon emissions, thereby reducing the cost of black carbon experiments, here, we introduced four machine learning algorithms which are lasso regression, support vector machine, extreme gradient boosting, and artificial neural network to predict ship black carbon emissions. The prediction models were established with using the datasets acquired from similar marine engines under various steady-state conditions. The results show that SVM, XGB, and ANN have higher prediction accuracy than lasso regression, and the adjusted R2 of each model is 0.9810, 0.9850, 0.9885, and 0.6088. Although ANN shows the best prediction performance, it is inferior to SVM and XGB in terms of model stability and training cost. Then, in order to simplify the optimization process of hyperparameters and improve the prediction accuracy of the model at the same time, we use three different swarm intelligence algorithms to automatically optimize the hyperparameters of SVM and XGB. In addition, we applied mutual information to measure the correlation between the characteristics of the prediction models and black carbon concentration and found that the characteristics which related to in-cylinder combustion have a strong correlation with the black carbon concentration. The findings in this paper prove the feasibility of machine learning in ship black carbon emission prediction and could provide references for reducing ship black carbon emissions and the formulation of emission regulations.
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Data Availability
The datasets generated and analyzed during the current study are not publicly available due to the datasets are used for engine R&D and belong to the technical secret of the enterprise but are available from the corresponding author on reasonable request. The datasets used during the current study are available from the corresponding author on reasonable request.
Abbreviations
- IMO:
-
International Maritime Organization
- FSN:
-
Filter smoke number
- PAS:
-
Photo-acoustic spectroscopy
- LII:
-
Laser-induced incandescence
- MAAP:
-
Multi-angle absorption photometer
- OC:
-
Organic carbon
- BC:
-
Black carbon
- eBC:
-
Concentration of black carbon
- rpm:
-
Engine speed (r·min−1)
- ML:
-
Machine learning
- BTDC:
-
Before top dead center
- CA:
-
Crack angle
- FC:
-
Fuel consumption
- BSFC:
-
Brake-specific fuel consumption
- MEP:
-
Mean effective pressure
- AI:
-
Air intake
- AMI:
-
Adjusted mutual information
- RP:
-
Rail pressure
- IT:
-
Injection timing
- LR:
-
Load rate
- φ:
-
Excess air coefficient
- ANN:
-
Artificial neural network
- XGB:
-
Extreme gradient boosting
- GBDT:
-
Gradient boosting decision tree
- SVM:
-
Support vector machine
- R2 :
-
Coefficient of determination
- MSE:
-
Mean square error
- MAE:
-
Mean absolute error
- GWO:
-
Gray wolf optimization
- HHO:
-
Harris hawk optimization
- SSA:
-
Sparrow search algorithm
- MI:
-
Mutual information
- NMI:
-
Normalized mutual information
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Acknowledgements
The authors are thankful to all the personnel who either provided technical support or helped with data collection. We also acknowledge all the reviewers for their useful comments and suggestions.
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Ying Sun, conceptualization, data curation, formal analysis, investigation, methodology, software, writing — original draft, and visualization.
Lin Lü, conceptualization, methodology, investigation, resources, writing — review and editing, supervision, and project administration.
Yun-kai Cai, writing — review and editing.
Peng Lee, conceptualization, methodology, validation, and writing — review and editing.
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Sun, Y., Lü, L., Cai, Yk. et al. Prediction of black carbon in marine engines and correlation analysis of model characteristics based on multiple machine learning algorithms. Environ Sci Pollut Res 29, 78509–78525 (2022). https://doi.org/10.1007/s11356-022-20496-4
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DOI: https://doi.org/10.1007/s11356-022-20496-4