Category: Mechanical Design and Engineering

Modelling of piston secondary motion in Diesel Engines

  A numerical simulation model of the piston motion has been discussed in the present work. The proposed methodology was used to analyze the secondary motion of piston skirt about wrist pin axis as well as resulting vibrations of engine block due to impacts of piston skirt along  cylinder liner. Various dynamic parameters used in the simulation of motion were calculated using mechanical mobility which was obtained by means of vibration measurements. The amplitude of lateral motion was found to...

Study of combustion development and modeling of the pollutants formation process in diesel engines

In recent years, to improve the efficiency of diesel engines and, at same time, to reduce the pollutants emission (NOx and soot), the researchers and the automotive producers have focused on technologies that enable compliance with both requirements: devices for the exhaust after-treatment, exhaust gas recirculation (EGR) and new combustion models. Thus, it was necessary a deeper understanding of the combustion process in diesel engines with direct injection. The research is related to the analysis of spray formation, combustion and...

Non-intrusive measurements on Engines – Acoustic radiations

The main advantage to develop non-intrusive measurement procedures rely on the possibility to perfom testing on engines without benching preparations, i.e outside labs. Since this route naturally leads not only on monitoring purposes but also on control duties, it is interesting to look for simple sensing chains which can be utilized on mass productions and can easily integrate with Engine Control Units. Real Time monitoring and control of combustion  process in engines is the way to deal with tight pollutant regulations. On a...