Abstract
A study conducted by a team of authors attempts to identify the occurrence of knocking based on the vibro-acoustic signal from the knock sensor and the signal from the pressure sensor glow plug (PSG). The reason the authors decided to discuss the issue is increasing interest in the use of information contained in the generated vibration and acoustic emissions as well as reducing acoustic emissions as one of the environmental threats. The adopted form of experiment and analysis enables determining the validity of testing of NVH multifuel engines. Information based on the vibro-acoustic signal allows to determine the qualitative and quantitative occurrence of the phenomenon of knocking in case of proper analysis. Both the energy spectrum of the vibration and the summation value of the successive bands of the spectrum confirm the occurrence of knock resulting from the analysis of the pressure in the combustion chamber and allow to relate to its intensity.
Highlights
Referring to the famous quote usually attributed to Saudi oil minister Sheik Ahmed Zaki Yamani in the 2005 New York Times article “The Breaking Point” – “he Stone Age didn’t end for lack of stone, and the oil age will end long before the world runs out of oil” suggests that particular attention should be drawn to development of control systems, and the accompanying possibility of improvement in the employed processes, including the fuel combustion process, as well as the administrative-legal changes, with special focus on the norms regarding pollution in relation to vehicle drive systems [1]
The reason why the authors discuss this subject is the growing interest in using the information included in generated vibrations and in the acoustic emission [15, 16] as well as in the reduction of the acoustic emission as one of the environmental threats. Another emission of vibrations and noise in a dual fuel engine is generated by the pressure change in the combustion chamber, which correlates with the measured parameters, among others, the torque
In order to analyse the occurrence of knocking combustion in a dual fuel CI engine, the registered vibration signals were subjected to Fourier transform, resulting in obtaining a series of amplitude spectra
Summary
Referring to the famous quote usually attributed to Saudi oil minister Sheik Ahmed Zaki Yamani in the 2005 New York Times article “The Breaking Point” – “he Stone Age didn’t end for lack of stone, and the oil age will end long before the world runs out of oil” suggests that particular attention should be drawn to development of control systems, and the accompanying possibility of improvement in the employed processes, including the fuel combustion process, as well as the administrative-legal changes, with special focus on the norms regarding pollution in relation to vehicle drive systems [1]. The reason why the authors discuss this subject is the growing interest in using the information included in generated vibrations and in the acoustic emission [15, 16] as well as in the reduction of the acoustic emission as one of the environmental threats Another emission of vibrations and noise in a dual fuel engine is generated by the pressure change in the combustion chamber, which correlates with the measured parameters, among others, the torque. This phenomenon seems to be interesting if an attempt to optimise the selected control parameters is taken into consideration, where the optimisation criterion is avoiding the occurrence of the knocking combustion, and reduction of vibrations
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