TORSIONAL VIBRATIONS OF THE TRANSMISSION OF A CAR WITH TWO POWER PLANTS IN THE SIMULINK ENVIRONMENT.

The study aimed to verify whether it is possible to diagnose the coking of a marine diesel engine injector nozzle by performing a spectral analysis of the crankshaft’s torsional vibrations. The measurements were taken using laser heads, clocked at 16 MHz. The reasons for selecting this type of optical sensors are described as well. The tests were carried out under laboratory conditions, using a test stand with a Sulzer 3AL 25/3 engine, operating under a load created by a Domel GD8 500–50/3 electric generator. A unique method is presented in the paper, which enables the measuring and calculation of torsional vibrations of engine crankshafts. The method was developed at the Chair of Marine Power Plants at the Maritime University of Gdynia. It has been proven that the distribution of differences in the values of individual harmonic components depends on the location of a defective injector nozzle in the cylinder.

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DEVELOPING INFORMATION PROCESSING UNIT USED IN SOFTWARE AND HARDWARE COMPLEX MONITORING SHIP SHAFT LINE TORSIONAL VIBRATIONS

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY ◽

10.24143/1812-9498-2021-1-22-28 ◽

2021 ◽

Vol 2021 (1) ◽

pp. 22-28

Author(s):

Konstantin Olegovich Sibryaev ◽

Maxim Michailovich Gorbachev ◽

Adel Damirovich Ibadullaev

Keyword(s):

Information Processing ◽

Power Plants ◽

Performance Testing ◽

Technical Condition ◽

Processing Unit ◽

Torsional Vibrations ◽

Operational Mode ◽

Shaft Line ◽

Hardware Complex ◽

Software And Hardware

The article considers torsional vibrations in combination with other technical factors, which remain a cause of damages and breakdowns of the ship's propeller shafts, intermediate shafts and crankshafts. Torsional vibrations inevitably occur in the ship plants. It can be explained by the uneven torque of the engine and the torque on the propeller (exposure of the propeller, uneven movement of the water flow, stormy weather, etc.), which leads to alternating twisting of the shaft. To reduce torsional vibrations, dampers are used, which require periodic performance testing by using the torsiography procedure. In contrast to the existing monitoring systems of the technical condition of the damper, it is planned to install an information processing unit for the software and hardware complex for monitoring torsional vibrations of the ship's shaft line and the parameters associated with them (vibration and temperature changes of the flexible elements of the connecting couplings). The unit under development will allow to constantly monitor the level of torsional vibrations and, if they increase, to signal the ship's mechanic to switch to another operational mode of the main engine, which will increase the reliability and automation of the ship power plants, the safety of navigation, and reduce the economic costs of ship operating

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Torsional Vibrations of the Rotating Parts of a Hydroelectric Generating Set in Transient Processes of Hydroelectric Power Plants

Power Technology and Engineering ◽

10.1007/s10749-019-00981-6 ◽

2019 ◽

Vol 52 (5) ◽

pp. 548-551

Author(s):

O. A. Murav’ev

Keyword(s):

Power Plants ◽

Transient Processes ◽

Torsional Vibrations ◽

Hydroelectric Power ◽

Generating Set ◽

Hydroelectric Power Plants

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Preparation of reasonable initial data for analytical and experimental studies of torsional vibrations of the universal diesel generator set DG-8.83

MORSKIE INTELLEKTUAL`NYE TEHNOLOGII ◽

10.37220/mit.2020.48.2.052 ◽

2020 ◽

Author(s):

М.А. Минасян ◽

Ц. Цзэн ◽

А.М. Минасян

Keyword(s):

Initial Data ◽

Power Plants ◽

Experimental Studies ◽

Torsional Vibrations ◽

The Finite Element Method ◽

Diesel Generator ◽

Empirical Formulas ◽

Moments Of Inertia ◽

Reasonable Choice ◽

Elastic Couplings

Крутильные колебания упруго-массовых систем относятся к тем опасным динамическим нагрузкам, которые могут приводить к аварийным повреждениям валов, упругих муфт и других элементов энергетических установок с дизельным приводом. Указанные особенности побудили авторов на первом этапе аналитических и экспериментальных исследований крутильных колебаний универсальной дизель – генераторной установки ДГ-8,83 подготовить обоснованные исходные данные. Для этой цели определены моменты инерции и податливости элементов крутильной системы по известным эмпирическим формулам, по методу конечных элементов и частично экспериментально. Затем на основе анализа и обобщения полученных результатов проведен обоснованный выбор моментов инерции и податливостей в качестве уточненных исходных данных. На базе выбранных исходных данных авторы намерены приступить к расчету крутильных колебаний с жестким и упругим соединением дизеля с генератором. Для обеспечения точности аналитических и экспериментальных исследований крутильных колебаний других дизельных установок авторы рекомендуют, прежде всего, подготовки обоснованных исходных данных. orsional vibrations of elastic-mass systems belong to those dangerous dynamic loads that can lead to emergency damage to shafts, elastic couplings and other elements of power plants with a diesel drive. These features prompted the authors to prepare reasonable initial data at the first stage of analytical and experimental studies of torsional vibrations of the universal diesel generator set DG-8.83. For this purpose, the moments of inertia and pliability of the elements of the torsion system are determined using known empirical formulas, the finite element method, and partially experimentally. Then, based on the analysis and generalization of the results obtained, a reasonable choice of moments of inertia and pliability was made as updated initial data. Based on the selected initial data, the authors intend to start calculating torsional vibrations with a rigid and elastic connection of a diesel engine with a generator. To ensure the accuracy of analytical and experimental studies of torsional vibrations of other diesel installations, the authors recommend, first, the preparation of reasonable initial data.

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Use of fractals to describe microstructures of porous thick-film platinum electrodes

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100121971 ◽

1992 ◽

Vol 50 (1) ◽

pp. 314-315

Author(s):

Steven D. Toteda

Keyword(s):

Fractal Dimension ◽

Power Plants ◽

Electrical Response ◽

Cubic Phase ◽

Platinum Electrodes ◽

Fine Grained ◽

Impedance Response ◽

Platinum Particles ◽

Energy Surfaces ◽

Highly Porous

Zirconia oxygen sensors, in such applications as power plants and automobiles, generally utilize platinum electrodes for the catalytic reaction of dissociating O2 at the surface. The microstructure of the platinum electrode defines the resulting electrical response. The electrode must be porous enough to allow the oxygen to reach the zirconia surface while still remaining electrically continuous. At low sintering temperatures, the platinum is highly porous and fine grained. The platinum particles sinter together as the firing temperatures are increased. As the sintering temperatures are raised even further, the surface of the platinum begins to facet with lower energy surfaces. These microstructural changes can be seen in Figures 1 and 2, but the goal of the work is to characterize the microstructure by its fractal dimension and then relate the fractal dimension to the electrical response. The sensors were fabricated from zirconia powder stabilized in the cubic phase with 8 mol% percent yttria. Each substrate was sintered for 14 hours at 1200°C. The resulting zirconia pellets, 13mm in diameter and 2mm in thickness, were roughly 97 to 98 percent of theoretical density. The Engelhard #6082 platinum paste was applied to the zirconia disks after they were mechanically polished ( diamond). The electrodes were then sintered at temperatures ranging from 600°C to 1000°C. Each sensor was tested to determine the impedance response from 1Hz to 5,000Hz. These frequencies correspond to the electrode at the test temperature of 600°C.

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The Effects of Ion Implantation on the Surface Features of Inconel 600

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100118333 ◽

1985 ◽

Vol 43 ◽

pp. 288-289

Author(s):

John D. Rubio

Keyword(s):

Grain Boundary ◽

Ion Implantation ◽

Nuclear Power ◽

Power Plants ◽

Surface Region ◽

Selective Dissolution ◽

Boundary Region ◽

Near Surface ◽

Inconel 600 ◽

Steam Generator Tubing

The degradation of steam generator tubing at nuclear power plants has become an important problem for the electric utilities generating nuclear power. The material used for the tubing, Inconel 600, has been found to be succeptible to intergranular attack (IGA). IGA is the selective dissolution of material along its grain boundaries. The author believes that the sensitivity of Inconel 600 to IGA can be minimized by homogenizing the near-surface region using ion implantation. The collisions between the implanted ions and the atoms in the grain boundary region would displace the atoms and thus effectively smear the grain boundary.To determine the validity of this hypothesis, an Inconel 600 sample was implanted with 100kV N2+ ions to a dose of 1x1016 ions/cm2 and electrolytically etched in a 5% Nital solution at 5V for 20 seconds. The etched sample was then examined using a JEOL JSM25S scanning electron microscope.

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