scholarly journals Thermotechnical tests of an electronically controlled main high-speed engine of a marine vessel

2021 ◽  
Vol 2061 (1) ◽  
pp. 012055
Author(s):  
VV Gerasidi ◽  
A V Lisachenko ◽  
N I Nikolaev
Keyword(s):  
High Speed ◽  
Experimental Studies ◽  
Technical Condition ◽  
Thermal Engineering ◽  
Technical Equipment ◽  
Repair Method ◽  
High Speed Engine ◽  
Technical Operation ◽  
Vibration Parameters ◽  
Marine Vessels

Abstract Thermotechnical tests of the main engine after a malfunction for putting it back into operation under the supervision of the Register inspector are presented in the paper. The electronically controlled high-speed Caterpillar C32 engine on the port side with an output of 1000 kW is described.Experimental studies of the value influence of thermaland vibration parameters on changes in the engine technical state are carried out during thermotechnicaltests. The experimental research methodology includes a classical approach to conducting such tests and a contemporary method with remote data transmission to the office of the vessel owner’s company.The accumulated practice in conducting experimental studies of the technical condition control by the in-place repair method of diagnostics makes it possible to move from classical approaches of technical operation to new ones included in the remote control and monitoring system of vessel technical means of autonomous ships in operation.The conducted studies have shown that the obtained values of the thermal engineering and vibration parameters do not exceed the maximum permissible values specified by the manufacturer.The results of the experimental study of Caterpillar engines demonstrate the defect initiation in one of the engine mounts by exceeding the values of vibration velocity.The conducted experimental studies of vessel technical equipment by the in-place repair method of diagnostics of marine vessels in operation are the basis of the control system of autonomous ships.

scholarly journals Assessment of thermal dispersion of elements of ship technical means of sea vessels

2021 ◽  
pp. 105-111
Author(s):  
В.В. Герасиди ◽  
А.В. Лисаченко ◽  
Н.И. Николаев ◽  
А.Е. Слицан
Keyword(s):  
High Speed ◽  
Experimental Studies ◽  
Technical Condition ◽  
Thermal Dissipation ◽  
Thermal Imager ◽  
Technical Equipment ◽  
Thermal Dispersion ◽  
Destructive Testing ◽  
High Speed Engine ◽  
Technical Operation

статья посвящена экспериментальному исследованию и оценке теплового рассеивания элементов судовых технических средств при помощи тепловизора: силиконового демпфера и водоводяного охладителя высокооборотного двигателя, дейдвудного подшипника. Для дейдвудного подшипника представлены также вибрационные параметры контроля. Применяемые в экспериментальных исследованиях переносные приборы неразрушающего контроля допущены к применению в РФ, проходят систематическую поверку и калибровку. Результаты экспериментальных исследований показывают, что при накоплении статистических данных по оценке теплового рассеивания судовых технических средств можно разработать рекомендации по нормированию и прогнозированию их состояния. Полученные экспериментальные данные могут быть предметом рассмотрения Классификационным обществом для улучшения качества наблюдения за технической эксплуатацией судовых технических средств. Доказано, что применение такого метода позволяет определить, температурное распределение в судовых технических средствах с учетом режимов эксплуатации пропульсивного комплекса и дополнить представление о техническом состоянии сочетания с другими методами контроля для оценки и прогнозирования технического состояния судовых технических средств. Накопленный опыт в проведении экспериментальных исследований контроля технического состояния безразборным методом диагностики позволит перейти от классических подходов технической эксплуатации до новых, входящих в систему удаленного контроля и управления судовых технических средств автономных судов в эксплуатации. the article is devoted to the experimental study and evaluation of the thermal dispersion of elements of ship technical means using a thermal imager: a silicone damper and a water-water cooler of a high-speed engine, a deadwood bearing. For the deadwood bearing, the vibration control parameters are also presented. Portable non-destructive testing devices used in experimental studies are approved for use in the Russian Federation, undergo systematic verification and calibration. The results of experimental studies show that with the accumulation of statistical data on the assessment of the thermal dissipation of ship technical equipment, it is possible to develop recommendations for rationing and forecasting their condition. The experimental data obtained can be the subject of consideration by the Classification Society for improving the quality of monitoring the technical operation of ship technical equipment. It is proved that the use of such a method allows us to determine the temperature distribution in ship technical means, taking into account the operating modes of the propulsive complex, and to supplement the idea of the technical condition of the combination with other control methods for assessing and predicting the technical condition of ship technical means The accumulated experience in conducting experimental studies of technical condition monitoring by the non-disassembled diagnostic method will allow us to move from classical approaches of technical operation to new ones included in the system of remote control and management of ship technical means of autonomous vessels in operation

scholarly journals Analysis of fuel consumption of modern electronically controlled high-speed marine engines

2021 ◽  
Vol 2061 (1) ◽  
pp. 012057
Author(s):  
V V Gerasidi ◽  
A V Lisachenko
Keyword(s):  
Fuel Consumption ◽  
High Speed ◽  
Experimental Studies ◽  
Technical Condition ◽  
Cip Method ◽  
Monitoring And Control ◽  
Thermal Tests ◽  
Modern Approach ◽  
Engine Model ◽  
Marine Engines

Abstract The paper presents thermal tests of modern electronically controlled high-speed main engines of Caterpillar 3500 series of marine vessels. During the thermotechnical tests, experimental studies were carried out to change the values of the actual fuel consumption depending on the engine load. The number of engines under study installed on sea tugs during 10 years of operation was 80 units. The accumulated experience in conducting experimental studies of the technical condition control by the CIP method of diagnostics will make it possible to move from the classical approaches of technical operation to the new ones included in the system of remote monitoring and control of ship technical means of autonomous ships in operation. The experimental research methodology includes a classic approach to conducting such tests and a modern approach with remote data transmission to the shipowner’s office. Studies have shown that different types of 3500 series engines have different actual fuel consumption values, but for each series, for example, 3512B, the scatter of points is small. The results of experimental studies of Caterpillar 3500 series engines made it possible to construct generalized dependences of the actual fuel consumption for each engine model separately. Experimental studies of ship technical means by the CIP method of diagnostics of sea vessels in operation are the basis for the control system of autonomous ships.

scholarly journals Analyzing vibration parameters of a modern high-speed engine during operation

2021 ◽  
Vol 2061 (1) ◽  
pp. 012056
Author(s):  
V V Gerasidi ◽  
A V Lisachenko
Keyword(s):  
Experimental Research ◽  
High Speed ◽  
Vibration Velocity ◽  
Frequency Range ◽  
Vibration Acceleration ◽  
Vibration Displacement ◽  
Black Sea Region ◽  
High Speed Engine ◽  
Vibration Parameters ◽  
Speed Engine

Abstract The paper presents results of experimental research into vibration parameters of a modern electronic control-enabled main high-speed engine, Caterpillar CAT 3516B as obtained during a running trial of a sea tug. CAT 3500 series Caterpillar high-speed engines are extensively used in sea tugs; there are about 40 units installed in vessels operating in the Azov and Black Sea region. The research technique involved measurement of vibration displacement, vibration velocity, vibration acceleration at an engine and its turbocharger components. The conducted experimental research has shown that in order to evaluate the technical state of an engine, it is necessary to measure vibration displacement and vibration velocity in a frequency range from 1 to 1000 Hz at 0.1 Hz intervals. For turbochargers, the vibration acceleration shall be measured in a frequency range from 1 to 15000 Hz at 1 Hz intervals. The results of the experimental research allowed determining necessary conditions for measurement of vibration parameters of Caterpillar CAT-3500 series modern high-speed engines commonly used in sea tugs. The experimental research into vessel installations by in-place diagnostics at operating sea-going vessels forms a foundation of an autonomous ship control system.

scholarly journals Identification of Sleeper Support Conditions Using Mechanical Model Supported Data-Driven Approach

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3609
Author(s):  
Mykola Sysyn ◽  
Michal Przybylowicz ◽  
Olga Nabochenko ◽  
Lei Kou
Keyword(s):  
High Speed ◽  
Experimental Studies ◽  
Dynamic Interaction ◽  
Theoretical Research ◽  
Rolling Stock ◽  
Monitoring Methods ◽  
Beam Dynamic ◽  
Track Geometry ◽  
Data Driven Approach ◽  
Support Conditions

The ballasted track superstructure is characterized by a relative quick deterioration of track geometry due to ballast settlements and the accumulation of sleeper voids. The track zones with the sleeper voids differ from the geometrical irregularities with increased dynamic loading, high vibration, and unfavorable ballast-bed and sleeper contact conditions. This causes the accelerated growth of the inhomogeneous settlements, resulting in maintenance-expensive local instabilities that influence transportation reliability and availability. The recent identification and evaluation of the sleeper support conditions using track-side and on-board monitoring methods can help planning prevention activities to avoid or delay the development of local instabilities such as ballast breakdown, white spots, subgrade defects, etc. The paper presents theoretical and experimental studies that are directed at the development of the methods for sleeper support identification. The distinctive features of the dynamic behavior in the void zone compared to the equivalent geometrical irregularity are identified by numeric simulation using a three-beam dynamic model, taking into account superstructure and rolling stock dynamic interaction. The spectral features in time domain in scalograms and scattergrams are analyzed. Additionally, the theoretical research enabled to determine the similarities and differences of the dynamic interaction from the viewpoint of track-side and on-board measurements. The method of experimental investigation is presented by multipoint track-side measurements of rail-dynamic displacements using high-speed video records and digital imaging correlation (DIC) methods. The method is used to collect the statistical information from different-extent voided zones and the corresponding reference zones without voids. The applied machine learning methods enable the exact recent void identification using the wavelet scattering feature extraction from track-side measurements. A case study of the method application for an on-board measurement shows the moderate results of the recent void identification as well as the potential ways of its improvement.

Numerical and experimental studies on the thermal and static characteristics of multi-leaf foil thrust bearing

2021 ◽  
pp. 135065012110110
Author(s):  
Yu Guo ◽  
Yu Hou ◽  
Qi Zhao ◽  
Xionghao Ren ◽  
Shuangtao Chen ◽  
...  
Keyword(s):  
High Speed ◽  
Thrust Bearing ◽  
Load Capacity ◽  
Failure Process ◽  
Experimental Studies ◽  
Elastic Model ◽  
Static Characteristics ◽  
Bearing Load ◽  
Foil Thrust Bearing ◽  
Cooling Air

Foil bearing is considered to be a promising supporting technology in high-speed centrifugal machinery. Due to the high-speed shearing effect in the viscous lubricant film, heat generation could not be ignored. In this paper, a thermo-elastic model of the multi-leaf foil thrust bearing is proposed to predict its thermal and static characteristics. In the model, modified Reynolds equation, energy equation, and Kirchhoff equation are solved in a coupling way. The contact area between the foil and welding plate is taken into account. Besides, the effect of cooling air on the bearing temperature is investigated. The ultimate load capacity and transient overload failure process of the bearing is analyzed and discussed. The effect of rotation speed on the bearing temperature is more obvious than that of the bearing load. The bearing temperature drops obviously by introducing the cooling air, and the cooling effect is improved with the supply pressure. The transient overload failure of the bearing occurs when the bearing load exceeds the ultimate value.

Quantitative Experimental Study of SiO2-Water Nanofluids on Backward-Facing Step Flow under Low Reynolds Number

2018 ◽  
Vol 916 ◽  
pp. 221-225
Author(s):  
Ji Zu Lv ◽  
Liang Yu Li ◽  
Cheng Zhi Hu ◽  
Min Li Bai ◽  
Sheng Nan Chang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Reynolds Number ◽  
Volume Fraction ◽  
Pure Water ◽  
Experimental Studies ◽  
Flow Characteristics ◽  
Thermal Engineering ◽  
Heat Transfer Medium ◽  
Step Flow

Nanofluids is an innovative study of nanotechnology applied to the traditional field of thermal engineering. It refers to the metal or non-metallic nanopowder was dispersed into water, alcohol, oil and other traditional heat transfer medium, to prepared as a new heat transfer medium with high thermal conductivity. The role of nanofluids in strengthening heat transfer has been confirmed by a large number of experimental studies. Its heat transfer mechanism is mainly divided into two aspects. On the one hand, the addition of nanoparticles enhances the thermal conductivity. On the other hand, due to the interaction between the nanoparticles and base fluid causing the changes in the flow characteristics, which is also the main factor affecting the heat transfer of nanofluids. Therefore, a intensive study on the flow characteristics of nanofluids will make the study of heat transfer more meaningful. In this experiment, the flow characteristics of SiO2-water nanofluids in two-dimensional backward step flow are quantitatively studied by PIV. The results show that under the same Reynolds number, the turbulence of nanofluids is larger than that of pure water. With the increase of nanofluids volume fraction, the flow characteristics are constantly changing. The quantitative analysis proved that the nanofluids disturbance was enhanced compared with the base liquid, which resulting in the heat transfer enhancement.

Interface Temperature Measurement and Experimental Studies of Super-High Speed Polishing of CVD Diamond Films

2010 ◽  
Vol 135 ◽  
pp. 271-276
Author(s):  
Shu Tao Huang ◽  
Li Zhou ◽  
Li Fu Xu
Keyword(s):  
Stainless Steel ◽  
Temperature Measurement ◽  
Temperature Rise ◽  
Diamond Film ◽  
High Speed ◽  
Experimental Studies ◽  
Pure Titanium ◽  
Cvd Diamond ◽  
Interface Temperature ◽  
Cvd Diamond Film

Super-high speed polishing of diamond film is a newly proposed method due to its outstanding features such as low cost and simple apparatus. The interface temperature rise is due to the friction force and the relative sliding velocity between the CVD diamond film and the polishing metal plate surface. In this paper, the interface temperature rise in super-high speed polishing of CVD diamond film was investigated by using the single-point temperature measurement method. Additionally, the influence of polishing plate material on the characteristics of super-high speed polishing has been studied. The results showed that cast iron is not suitable for super-high polishing, while both 0Cr18Ni9 stainless steel and pure titanium can be used for the super-high polishing of CVD diamond film. The quality and efficiency of polishing with 0Cr18Ni9 stainless steel plate is much higher than those of pure titanium, and the material removal rate could reach to 36-51 m/h when the polishing speed and pressure are 100 m/s and 0.17-0.31 MPa, respectively.

Application of neural network expert systems for monitoring, diagnostics and forecasting of technical condition of aircraft engines

2020 ◽  
pp. 51-59
Author(s):  
Д.О. Пушкарёв
Keyword(s):  
Neural Network ◽  
Expert Systems ◽  
Gas Turbine ◽  
Technical Condition ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Fuzzy Interference System ◽  
Interference System ◽  
Monitoring And Diagnostics ◽  
Technical Operation

Рассматривается применение нейросетевых экспертных систем в области контроля, диагностики и прогнозирования технического состояния авиационных ГТД на основе нечеткой логики. Показана методика для решения таких задач в области технической эксплуатации авиационной техники совместно с использованием фаззи-интерференсной системы программы MATLAB. Используя статистические данные о работе двигателя формируется экспертная система на основе нейронной сети позволяющая осуществлять контроль и диагностику ГТД, а также прогнозировать дальнейшее техническое состояния анализируемого двигателя. The application of neural network expert systems in the field of monitoring, diagnostics and forecasting of the technical condition of aviation gas turbine engines based on fuzzy logic is considered. The technique for solving such problems in the field of technical operation of aircraft and using the fuzzy-interference system of the MATLAB program is shown. Using statistical data on the operation of the engine, an expert system is based on the fundamental of a neural network that provide monitoring and diagnostics of gas turbine engines, as well as predicting the further technical condition of the analyzed engine.

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

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