Sensitivity Optimisation of a Main Marine Diesel Engine Electronic Speed Governor

Madey

et al. 2022

JMSE

In this study, a method for ensuring reliable and safe operation of marine trunk diesel engines is considered. The research was carried out on 5L23/30 MAN-B&W diesel engines of a Bulk Carrier class vessel. The objective of the study was to determine the effect of the structural characteristics of the oil layer (wetting angle and thickness) on the operational parameters of a marine diesel engine (compression pressure, concentration of nitrogen oxides in exhaust gases and temperature of exhaust gases after the cylinder) and performance characteristics of the oil (base number, wear and contaminant elements). It has been established that an increase in the degree of the contact angles of wetting and in the thickness of the oil layer improves the heat and power and environmental performance of a diesel engine. At the same time, the decrease in compression pressure in the cylinder slows down, the temperature of gases after the cylinder decreases, and the emission of nitrogen oxides with exhaust gases decreases. Also, it was found that wear of diesel parts and oil oxidation are reduced. The study confirms the possibility of improving the reliable and safe operation of trunk-type diesel engines of maritime vessels by effective control of variables relating to the characteristics of engine oil.

Section: Resultsmentioning

confidence: 99%

Ensuring Reliable and Safe Operation of Trunk Diesel Engines of Marine Transport Vessels

Madey

et al. 2022

JMSE

“…In recent years, promising results have been achieved in terms of an increase in the maximum operating pressure in hydrostatic systems, which contributes to the overall improvement of the operational and massdimensional parameters of various elements included in the transmissions of this type [22]. The operating range of speed control of the hydraulic motor shaft is expanding, which improves operating conditions and allows obtaining an optimal combination of the parameters of the hydraulic motor shaft speed to the lowest possible speed of its rotation under load, which allows increasing the efficiency of the system as a whole [23].…”

Section: Discussionmentioning

confidence: 99%

Development of a Model for Calculating the Slip Coefficients of a Mechanical Wheeled Vehicle with Two Steering Axles

Bekenov¹,

Nussupbek²,

Tassybekov³

et al. 2022

Communications

The purpose of the study is to perform appropriate calculations of the values of the total slip coefficients alternately on the sides of a vehicle, depending on the angles of rotation of its axles, using the single slip coefficients of its individual wheels directly when turning. The basis of the methodological approach in this study is a combination of system analysis of the principles of calculating the slip coefficients of a mechanical wheeled vehicle with an analytical investigation of problematic aspects of developing a model for calculating the slip coefficients of a vehicle with two steering axles. The results obtained indicate the presence of a persistent relationship between the slipping coefficients of a mechanical wheeled vehicle and the rotation angles of its two steering axles, including a number of other parameters that are important from the standpoint of traffic safety.

“…Even for small sailing ships, sails are used as an additional source that provides movement, and a heat engine is installed as the main one. Internal combustion engines (diesels) are the most common heat engines used in transport [1,2]. Diesels are sources of mechanical energy for automobile, railway, sea and inland water transport, as well as agricultural and mobile (small or portable) equipment [3,4].…”

Section: Introductionmentioning

confidence: 99%

Analysis of methods of managing the environmental safety of the navigation passage of ships of maritime transport

Sagin,

Madey

2023

TAPR

The requirements of the MARPOL international convention on ensuring the environmental performance of marine diesel engines in relation to the emission of sulfur oxides, as well as marine fuels during navigation passages of sea transport vessels in special ecological areas, are given. The use of scrubber cleaning of exhaust gases and the use of fuel mixtures, which include biodiesel fuel, are considered as methods that meet these requirements. The research was carried out on ships of the Bulker Carrier class with deadweight of 63,246 tons during the navigation transition between the ports of Northern Europe. One of the vessels used scrubber cleaning of exhaust gases as a method of environmental safety management. The other is the use of fuel mixtures, which include biodiesel fuel. Both vessels are equipped with a 5S60ME-C8.2 MAN-Diesel&Turbo marine diesel engine as the main engine, and three 6EY18ALW Yanmar diesel engines as auxiliary engines. The ratio of sulfur oxides to carbon oxides – SO2/CO2 – was chosen as an indicator for evaluating the effectiveness of environmental safety management methods. This value was monitored and regulated by an automatic monitoring system. It was found that both methods meet the requirements of the MARPOL convention, namely, they will support the SO2/CO2 ratio in the range of 2.29–4.17 (when in special environmental control zones) and in the range of 6.46–20.83 (when in outside the zone of special environmental control). The use of environmental safety management methods increases energy costs for ensuring this process. When using exhaust gas scrubbing, additional power losses reach 237–278 kW. In the case of using a fuel mixture that includes biodiesel fuel, power losses amount to 18–20 kW. It has been experimentally confirmed that the use of a fuel mixture that includes biodiesel fuel is characterized by a lower level of environmental sustainability. At the same time, compared to the use of scrubber cleaning of exhaust gases, this method requires less energy consumption and is also characterized by simpler additional equipment. In this regard (and also taking into account that all the requirements of Annex VI MARPOL are provided), it is recommended as the main one to ensure the environmental safety of navigation passages of sea transport vessels.