The Experimental Identification of the Dynamic Coefficients of two Hydrodynamic Journal Bearings Operating at Constant Rotational Speed and Under Nonlinear Conditions

Breńkacz, Łukasz; Żywica, Grzegorz; Drosińska-Komor, Marta

doi:10.1515/pomr-2017-0142

Cited by 14 publications

(7 citation statements)

References 18 publications

(21 reference statements)

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“…Such tests usually allow to perform only a comparative analysis of tested sliding pairs. In some cases such tests may be also aimed at identification of dynamic features of a bearing [69].…”

Section: Discussionmentioning

confidence: 99%

Selected Problems of Experimental Testing Marine Stern Tube Bearings

Barszczewska

Piątkowska

Litwin

2019

Polish Maritime Research

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Section: Discussionmentioning

confidence: 99%

Selected Problems of Experimental Testing Marine Stern Tube Bearings

Barszczewska

Piątkowska

Litwin

2019

Polish Maritime Research

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“…It was built in 2018 and has seven holds, each with a capacity of 26,000 cubic meters. The parameters of the ship are as follows: overall length 333 m, moulded breadth 59 m, deadweight capacity 326,107 DWT, nominal capacity 180,000 m 3 .…”

Section: Proposals For the Modernisation Of Selected Marine Power Pla...mentioning

confidence: 99%

“…With an increased number of ship journeys, the amount of fuel burned is growing, which increases the production of CO 2 , NO x and SO x , having an adverse impact on the environment [1], [2]. A reduction of the harmful impact on the environment can be achieved, among others, by modernizing existing systems and improving their parameters [3], [4] and by additionally introducing and developing new solutions, such as fuel cells [5] or nuclear propulsion. Nuclear fuel has the advantage of negligible life-cycle CO 2 emissions and a relatively low price compared to other fuels [6].…”

Section: Introductionmentioning

confidence: 99%

On the Use of Selected 4th Generation Nuclear Reactors in Marine Power Plants

Drosińska-Komor

Głuch

Breńkacz

et al. 2022

Polish Maritime Research

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This article provides a review of the possibility of using different types of reactors to power ships. The analyses were carried out for three different large vessels: a container ship, a liquid gas carrier and a bulk carrier. A novelty of this work is the analysis of the proposal to adapt marine power plants to ecological requirements in shipping by replacing the conventional propulsion system based on internal combustion engines with nuclear propulsion. The subjects of comparison are primarily the dimensions of the most important devices of the nuclear power plant and the preliminary fitness analysis. It was assumed for this purpose that the nuclear power plant fits in the engine room compartment and uses the space left after the removal of the combustion engines. At the same time, this propulsion provides at all times sufficient energy for port, technological and shipping operations at an economically justifiable speed. For deep-sea vessels, which are supposed to reach null emissions of CO, CO2, NOx, SOx and H2O, this is one of the most reasonable solutions. Finally the paper proves that all the above-mentioned marine functions could be effectively applied in power plants equipped with 4th generation nuclear reactors.

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“…Wang et al 30 investigated a system identification method for rotating machinery stability evaluation based on sine sweep excitation testing method using electromagnetic actuator. Brenkacz et al 31 used an impact hammer to excite the rotor, the four (i.e. two main and two cross-coupled) coefficients of stiffness, damping, and mass for each bearing are obtained.…”

Section: Introductionmentioning

confidence: 99%

Identification method of dynamic characteristics coefficients of tilting pad bearing in critical speed range of large unit

Chen

Wang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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For tilting pad bearing of large unit, it is not easy to identify stiffness and damping coefficients in full-size unit test. Because of many limiting factors in large unit test, the stiffness and damping test methods are not fully applicable to large units, which can be easily implemented in laboratory. The nonexcitation methods are proposed in this paper to identify the stiffness and damping coefficients of tilting pad bearing in the critical speed range of large unit, including direct method and iterative method. Firstly, the rotor speed and vibration during the whole period are obtained. The vibration data of the first-order critical speed range in the startup stage are selected, and the stiffness and damping coefficients of tilting pad bearing are identified through the two methods. The results show that the stiffness and damping coefficients identified through the direct method are generally less than the theoretical values. The identification error of stiffness coefficient is within ±9%, and the identification accuracy of stiffness coefficient is significantly higher than that of damping coefficient. The damping coefficient identified by the iterative method agrees well with the theoretical value, and the identification error is about −3%. In conclusion, the stiffness and damping coefficients of tilting pad bearing in the range of first-order critical speed can be obtained by combining the two identification methods. These identification results are relatively reliable and can basically meet the analysis requirements of important vibration problems of bearing-rotor system.

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The Experimental Identification of the Dynamic Coefficients of two Hydrodynamic Journal Bearings Operating at Constant Rotational Speed and Under Nonlinear Conditions

Abstract: ABSTRACT

Cited by 14 publications

References 18 publications

Selected Problems of Experimental Testing Marine Stern Tube Bearings

Selected Problems of Experimental Testing Marine Stern Tube Bearings

On the Use of Selected 4th Generation Nuclear Reactors in Marine Power Plants

Identification method of dynamic characteristics coefficients of tilting pad bearing in critical speed range of large unit

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