THE CHANCES FOR REDUCTION OF VIBRATIONS IN MECHANICAL SYSTEM WITH LOW-EMISSION SHIPS COMBUSTION ENGINES

2021 ◽  
Vol 157 (A4) ◽  
Author(s):  
R Grega ◽  
J Homišin ◽  
M Puškár ◽  
J Kul’ka ◽  
J Petróci ◽  
...  
Keyword(s):  
Mechanical System ◽  
Diesel Engines ◽  
Fuel Mixture ◽  
Adverse Impact ◽  
Exhaust Gas ◽  
Combustion Engines ◽  
Low Emission ◽  
Power Outputs ◽  
Exhaust Gas Emissions ◽  
Engine Power

Development of diesel engines is focused on reduction of exhaust gas emissions, increase of efficiency of the fuel mixture combustion and decrease of fuel consumption. Such engines are referred to as low-emission engines. Low- engines trends bring higher engine power outputs, torques and also increase of vibrations and noisiness level. In order to reduce these vibrations of diesel engines, it is necessary to apply different dynamical elements, which are able to increase an adverse impact of exciting amplitudes. One of the results is application of a pneumatic dual-mass flywheel. The pneumatic dual-mass flywheel is a dynamical element that consists of two masses (the primary and the secondary mass), which are jointed together by means of a flexible interconnection. This kind of the flywheel solution enables to change resonance areas of the mechanical system which consequently leads to reduction of vibrations.

The Chances for Reduction of Vibrations in Mechanical System with Low-Emission Ships Combustion Engines

2015 ◽  
Vol 157 (A4) ◽  
pp. 235-240 ◽  
Keyword(s):  
Mechanical System ◽  
Diesel Engines ◽  
Fuel Mixture ◽  
Adverse Impact ◽  
Exhaust Gas ◽  
Combustion Engines ◽  
Low Emission ◽  
Power Outputs ◽  
Exhaust Gas Emissions ◽  
Engine Power

"Development of diesel engines is focused on reduction of exhaust gas emissions, increase of efficiency of the fuel mixture combustion and decrease of fuel consumption. Such engines are referred to as low-emission engines. Lowengines trends bring higher engine power outputs, torques and also increase of vibrations and noisiness level. In order to reduce these vibrations of diesel engines, it is necessary to apply different dynamical elements, which are able to increase an adverse impact of exciting amplitudes. One of the results is application of a pneumatic dual-mass flywheel. The pneumatic dual-mass flywheel is a dynamical element that consists of two masses (the primary and the secondary mass), which are jointed together by means of a flexible interconnection. This kind of the flywheel solution enables to change resonance areas of the mechanical system which consequently leads to reduction of vibrations."

scholarly journals Application of bat-cell bio-ambient tests in exhaust gas emissions examinations for Euro 4 and Euro 6 combustion engines

2017 ◽  
Vol 4 (17) ◽  
pp. 83-90
Author(s):  
Aleksandra KESKA ◽  
Anna JANICKA
Keyword(s):  
Exhaust Gas ◽  
Combustion Engines ◽  
Legal Requirements ◽  
Gaseous Mixtures ◽  
In Vitro Method ◽  
Emission Standards ◽  
Living Organisms ◽  
Exhaust Gas Emissions ◽  
Harmful Effects

The introduction of the subsequent European emission standards raises controversy among vehicle manufacturers and researchers. In order to meet the legal requirements, it is necessary to continually improve not only the cars but also the costly measurement facilities. In addition, current methods do not give a clear answer to the harmful effects of exhaust gases on living organisms. By using the appropriate In vitro method to directly assess the toxicity of gaseous mixtures, one can obtain simple, reliable results that can be used to validate the introduction of ever more stringent Euro standards

scholarly journals Cavitation treatment of water-fuel mixture for internal combustion engines

2021 ◽  
Vol 5 (2) ◽  
Author(s):  
Ivan Aftanaziv ◽  
Lily Shevchuk ◽  
Orissa Strogan ◽  
Lesia Strutynska
Keyword(s):  
Water Content ◽  
Fuel Economy ◽  
Power Supply ◽  
Internal Combustion Engines ◽  
Fuel Mixture ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Traffic Jams ◽  
The Cost ◽  
Engine Power

The efficiency of cavitation treatment of water-gasoline fuel mixture for power supply of automobile internal combustion engines has been experimentally investigated. It is established that cavitation treatment of this fuel mixture allows to increase the water content in it up to 15–17%, reducing the engine power by only 6–7%. This allows up to 10–15% to increase the cost of gasoline when running engines in city traffic jams and on flat and sloping sections of highways. The description of the automobile electromagnetic vibrating cavitator developed for cavitation processing of water-gasoline fuel which not only provides fuel, economy, but also increases degree of completeness of combustion of water-gasoline fuel mix is resulted. As a result, the ecology of the environment is improving.

Reduction Techniques of Exhaust Gas Emissions to Meet US EPA Tier4 Standard for Non-Road In-Direct Injection Diesel Engines

2014 ◽  
Author(s):  
Takashi Onishi ◽  
Tomoya Akitomo ◽  
Yuichi Tamaki ◽  
Yoshikazu Takemoto ◽  
Hideyuki Goto ◽  
...  
Keyword(s):  
Diesel Engines ◽  
Direct Injection ◽  
Exhaust Gas ◽  
Gas Emissions ◽  
Reduction Techniques ◽  
Us Epa ◽  
Exhaust Gas Emissions

scholarly journals Analysis and Multi-Parametric Optimisation of the Performance and Exhaust Gas Emissions of a Heavy-Duty Diesel Engine Operating on Miller Cycle

Energies ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3724
Author(s):  
Charalampos Georgiou ◽  
Ulugbek Azimov
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Emission Characteristics ◽  
Exhaust Gas ◽  
Miller Cycle ◽  
Heavy Duty ◽  
Gas Emissions ◽  
Performance And Emission ◽  
Heavy Duty Diesel ◽  
Exhaust Gas Emissions

A major issue nowadays that concerns the pollution of the environment is the emissions emerging from heavy-duty internal combustion engines. Such concern is dictated by the fact that the electrification of heavy-duty transport still remains quite challenging due to limitations associated with mileage, charging speed and payload. Further improvements in the performance and emission characteristics of conventional heavy-duty diesel engines are required. One of a few feasible approaches to simultaneously improve the performance and emission characteristics of a diesel engine is to convert it to operate on Miller cycle. Therefore, this study was divided into two stages, the first stage was the simulation of a heavy-duty turbocharged diesel engine (4-stroke, 6-cylinder and 390 kW) to generate data that will represent the reference model. The second stage was the application of Miller cycle to the conventional diesel engine by changing the degrees of intake valve closure and compressor pressure ratio. Both stages have been implemented through the specialist software which was able to simulate and represent a diesel engine based on performance and emissions data. An objective of this extensive investigation was to develop several models in order to compare their emissions and performances and design a Miller cycle engine with an ultimate goal to optimize diesel engine for improved performance and reduced emissions. This study demonstrates that Miller cycle diesel engines could overtake conventional diesel engines for the reduced exhaust gas emissions at the same or even better level of performance. This study shows that, due to the dependence of engine performance on complex multi-parametric operation, only one model achieved the objectives of the study, more specifically, engine power and torque were increased by 5.5%, whilst nitrogen oxides and particulate matter were decreased by 30.2% and 5.5%, respectively, with negligible change in specific fuel consumption and CO2, as average values over the whole range of engine operating regimes.

scholarly journals Excess Air Ratio Management in a Diesel Engine with Exhaust Backpressure Compensation

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6701
Author(s):  
Piotr Kasprzyk ◽  
Jacek Hunicz ◽  
Arkadiusz Rybak ◽  
Michał S. Gęca ◽  
Maciej Mikulski
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Exhaust System ◽  
Gas Analysis ◽  
Feedback Signal ◽  
Exhaust Gas ◽  
Lean Burn ◽  
Gasoline Engines ◽  
Excess Air ◽  
Low Emission

The paper investigates the operation of a wideband universal exhaust gas oxygen (UEGO) sensor in a diesel engine under elevated exhaust backpressure. Although UEGO sensors provide the excess air ratio feedback signal primarily in spark ignition engines, they are also used in diesel engines to facilitate low-emission combustion. The excess air signal is used as an input for the fuel mass observer, as well as to run the engine in the low-emission regime and enable smokeless acceleration. To ensure a short response time and individual cylinder control, the UEGO sensor can be installed upstream of a turbocharger; however, this means that the exhaust gas pressure affects the measured oxygen concentration. Therefore, this study determines the sensor’s sensitivity to the exhaust pressure under typical conditions for lean burn low-emission diesel engines. Identification experiments are carried out on a supercharged single-cylinder diesel engine with an exhaust system mimicking the operation of the turbocharger. The apparent excess air measured with the UEGO sensor is compared to that obtained in a detailed exhaust gas analysis. The comparison of reference and apparent signals shows that the pressure compensation correlations used in gasoline engines do not provide the correct values for diesel engine conditions. Therefore, based on the data analysis, a new empirical formula is proposed, for which the suitability for lean burn diesel engines is verified.

scholarly journals Carbon dioxide emissions in the aspect of applied engine fuels

2007 ◽  
Vol 131 (4) ◽  
pp. 62-67
Author(s):  
Marek BRZEŻAŃSKI
Keyword(s):  
Carbon Dioxide ◽  
Energy Transfer ◽  
Carbon Dioxide Emissions ◽  
Comparative Method ◽  
Fuel Mixture ◽  
Calculation Procedure ◽  
Exhaust Emission ◽  
Exhaust Gas ◽  
Combustion Engines ◽  
Emission Regulations

The article addresses some questions concerning the exhaust gas carbon dioxide emissions as a result of applying different kinds of engine fuels. The current exhaust emission regulations are provided in the article together with the new standards that have been proposed. In addition, the paper discusses some present methods applied to decrease carbon dioxide emissions from combustion engines, including the use of new fuels. The following part of the article provides a calculation procedure of carbon dioxide emissions and proposes a new comparative method of evaluating carbon dioxide emissions with respect to different fuels. The criterion for the comparison is the value of energy transfer as an air-fuel mixture to the engine. This coefficient of carbon dioxide emissions allows a comparison between emissions in the case of various fuels with reference to gasoline and to draw some conclusions.

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