scholarly journals DIAGNOSIS OF INJECTORS OF HIGH-SPEED MARINE DIESEL ENGINES

2017 ◽  
pp. 50-58
Author(s):  
Konstantin Olegovich Sergeev ◽  
Andrew Adol'fovich Pankratov
Keyword(s):  
Vibration Control ◽  
Diesel Engines ◽  
High Speed ◽  
Vibration Signal ◽  
Technical Condition ◽  
Center Frequency ◽  
High Speed Diesel ◽  
Marine Diesel

The method of determining the technical condition of the injector of high-speed diesel using the method of vibration control on the injector body is considered. Vibration signal is measured by the accelerometer and is filtered by 1/3 - octave filter with a center frequency of 63 kHz. The measurements were performed at idle, 20%, 33%, 66% and 100% of rated power, as well as on the nominal power with an artificially introduced defect of the injector - spring breakage. The temporal realization of the signal is used for diagnosis. The conclusions about the nature of the change in the temporal realization of vibration signal depending on the power state and the presence of faults have been made. The possibility of determining of the cyclic supply and cylinder output using the vibration signal was estimated. The direction of further research to improve the accuracy of diagnosis has been proposed.

Application of HFRT Methods to Diagnose the Technical Condition of High-Speed Marine Diesel Engines

2015 ◽  
Vol 236 ◽  
pp. 161-168
Author(s):  
Tomasz Lus
Keyword(s):  
Diesel Engines ◽  
High Speed ◽  
Internal Combustion Engines ◽  
Fuel Injection ◽  
Combustion Process ◽  
Technical Condition ◽  
Injection System ◽  
Engine Fuel ◽  
Naval Academy ◽  
Marine Diesel

The paper presents problems related to testing of the technical condition of high-speed marine diesel engines that are not equipped with indicated valves, as it is in the case of larger medium-and low-speed marine internal combustion engines. In this case, in assessment of technical condition of engine fuel injection system and valve gear system a vibration signals (in time / angle domain) analysis modified method called HFRT (High Frequency Resonance Technique) can be used. This method indirectly helps also to evaluate the fuel combustion process in the engine cylinders. The paper presents the theoretical basis of a modified HFRT method, physical implementation of the marine diesel engine system’s analyzer used for marine engines testing built at the Institute of Construction and Operation of Ships at Polish Naval Academy (PNA) in Gdynia. The paper also includes a description of the vibration signal processing methodology and examples of measurements made in the ships conditions for a few selected types of engines.

scholarly journals The Valve Gear Systems Timing Parameters Identification for Marine Diesel Engines Diagnostics / Identyfikacja Parametrów Układów Rozrządu Silników Okrętowych Dla Potrzeb Diagnostyki

2015 ◽  
Vol 33 (1) ◽  
pp. 91-100
Author(s):  
Tomasz Lus
Keyword(s):  
Diesel Engines ◽  
High Speed ◽  
Internal Combustion Engines ◽  
Diagnostic Method ◽  
Combustion Process ◽  
Technical Condition ◽  
Naval Academy ◽  
Marine Diesel ◽  
Gear Mechanism ◽  
Valve Gear

Abstract In the paper results of studies that aim was to develop a diagnostic method for high-speed marine diesel engines are presented. Polish Navy is operating significant number of engines of this type also on board of submarines. Engines of this type do not have indicator valves, which complicates the assessment of combustion process and their technical condition. Polish Naval Academy in Gdynia for years has been developing methods of diagnosing marine internal combustion engines. In recent years, a diagnostic method for high-speed marine diesel engines based on the analysis of envelope of vibration accelerations generated by the valve gear mechanism and fuel system has been developed. Some tests results made on Mercedes-Maybach MB820 engines used on Kobben class submarines are presented in the paper.

scholarly journals Changes in Marine Diesel Engines Operating Strategy

2018 ◽  
Vol 1 (1) ◽  
pp. 739-746
Author(s):  
Tomasz Lus
Keyword(s):  
Diesel Engines ◽  
High Speed ◽  
Condition Based Maintenance ◽  
Gradual Transition ◽  
Naval Academy ◽  
Operating Strategy ◽  
Functional Systems ◽  
Reliability Centered Maintenance ◽  
High Speed Diesel ◽  
Marine Diesel

Abstract Constant changes in the operating strategy of marine diesel engines are observed. They refer to whole engine and different functional systems of the engine in different range. The paper presents changes in marine diesel engines operating strategy. Gradual transition from simple failure response operating strategy – Corrective Maintenance (CM) to a reliability-oriented strategy – Reliability Centered Maintenance (RCM) has been described together with some remarks about Planed Maintenance (PM) systems and Condition Based Maintenance (CBM) systems with their latest form called CBM+. Some information about changes in diesel engines operating strategy in the Polish Navy (PN) at the turn of the last 35 years is also presented. An attempt to build engine analyzer for high-speed diesel engines at the Polish Naval Academy (PNA) in order to improve submarine diesel engines operating strategy is also described in the paper.

CFD Analyses on 2-Stroke High Speed Diesel Engines

2011 ◽  
Vol 4 (2) ◽  
pp. 2240-2256 ◽  
Author(s):  
Carlo Alberto Rinaldini ◽  
Enrico Mattarelli ◽  
Valeri Golovitchev
Keyword(s):  
Diesel Engines ◽  
High Speed ◽  
High Speed Diesel ◽  
Cfd Analyses

Reducing Engine-Out Emissions for Medium High Speed Diesel Engines: Influence of Injection Parameters

2009 ◽  
Author(s):  
Pieter Roels ◽  
Yves Sledsens ◽  
Sebastian Verhelst ◽  
Roger Sierens ◽  
Lieven Vervaeke
Keyword(s):  
Diesel Engines ◽  
High Speed ◽  
Injection Parameters ◽  
High Speed Diesel

Characteristics of injection of diesel fuel, rapeseed oil and their mixtures in diesel engines of various types

2021 ◽  
pp. 167-178
Author(s):  
Keyword(s):  
Diesel Engine ◽  
Diesel Fuel ◽  
Diesel Engines ◽  
Rapeseed Oil ◽  
High Speed ◽  
Fuel Injection ◽  
Experimental Studies ◽  
Fuel Injector ◽  
High Speed Diesel ◽  
Engine Type

The necessity of adapting diesel engines to work on vegetable oils is justified. The possibility of using rapeseed oil and its mixtures with petroleum diesel fuel as motor fuels is considered. Experimental studies of fuel injection of small high-speed diesel engine type MD-6 (1 Ch 8,0/7,5)when using diesel oil and rapeseed oil and computational studies of auto-tractor diesel engine type D-245.12 (1 ChN 11/12,5), working on blends of petroleum diesel fuel and rapeseed oil. When switching autotractor diesel engine from diesel fuel to rapeseed oil in the full-fuel mode, the mass cycle fuel supply increased by 12 %, and in the small-size high-speed diesel engine – by about 27 %. From the point of view of the flow of the working process of these diesel engines, changes in other parameters of the fuel injection process are less significant. Keywords diesel engine; petroleum diesel fuel; vegetable oil; rapeseed oil; high pressure fuel pump; fuel injector; sprayer

DIRECT UTILIZATION OF CRUDE OIL AS A FUEL FOR HIGH-SPEED DIESEL ENGINES

1975 ◽  
Author(s):  
E. C. Owens ◽  
E. A. Frame ◽  
Walter Bryzik
Keyword(s):  
Crude Oil ◽  
Diesel Engines ◽  
High Speed ◽  
High Speed Diesel
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