Vibration and Emission Characteristics in Diesel Engine Systems

Diesel engines remain a cornerstone of heavy-duty transport and power generation but present enduring challenges in managing both mechanical vibration and exhaust emissions. Vibration arises primarily from combustion-induced pressure fluctuations, reciprocating inertia forces and torsional dynamics of the cranktrain. Uncontrolled vibration accelerates component wear, contributes to structural fatigue and propagates noise pollution. Concurrently, combustion conditions dictate the formation of nitrogen oxides, particulate matter and unburned hydrocarbons, all subject to increasingly stringent global regulations. Advances in sensor technologies and signal processing now allow real-time monitoring of vibration signatures, while multi-parameter optimisation techniques seek to reconcile the trade-offs between combustion efficiency, vibration reduction and emission minimisation. The adoption of alternative fuels and biofuel blends has further complicated this landscape, altering combustion timing, heat release rates and thus both vibration spectra and pollutant formation. A holistic appreciation of the coupling between vibratory behaviour and emission dynamics is essential for improving engine reliability, extending service intervals and meeting environmental targets.

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Vibration and Emission Characteristics in Diesel Engine Systems publication trend

The graph below shows the total number of articles in vibration and emission characteristics in diesel engine systems across all publications each year (not limited to Nature Index journals).

Technical terms

Root mean square (RMS): Statistical measure of the magnitude of a varying signal, often used to quantify vibration amplitude.

Fast Fourier transform (FFT): Algorithm that converts time-domain signals into frequency components for spectral analysis.

Short-time Fourier transform (STFT): Extension of FFT that provides time-localised frequency information, useful for transient vibration events.

Particulate matter (PM): Solid or liquid particles emitted in exhaust, harmful to human health and subject to regulatory limits.

Nitrogen oxides (NOx): Reactive gases formed at high combustion temperatures, regulated due to their role in smog and respiratory problems.

Response-surface methodology (RSM): Statistical technique for exploring relationships between multiple input factors and one or more response variables, applied to optimise engine injection settings.

References

1. A Vibration Analysis for the Evaluation of Fuel Rail Pressure and Mass Air Flow Sensors on a Diesel Engine: Strategies for Predictive Maintenance. Sensors (2024).
2. Engine vibration and noise characteristics of common rail direct injection engine fuelled with orange peel oil by response surface methodology based multi-objective optimization. Results in Engineering (2023).
3. Environmental Assessment of a Diesel Engine Fueled with Various Biodiesel Blends: Polynomial Regression and Grey Wolf Optimization. Sustainability (2022).
4. An Experimental Study of the Effects of Cylinder Lubricating Oils on the Vibration Characteristics of a Two-Stroke Low-Speed Marine Diesel Engine. Polish Maritime Research (2023).