Abstract
This article presents the utilitarian need to determine the free vibrations of marine Diesel engine cylinder liners and the authors’ own studies in this area. Theoretical investigations on free vibrations and experimental ones on forced vibrations have been described. Theoretical studies have been conducted with the application of characteristic dimensionless numbers in the Elektroniks Workbench and Wis Sim digital environment enabling virtual modeling of cylinder liner vibrations and determination of their characteristics: amplitudes, frequencies and accelerations. In the theoretical examination mechanical and electrical system analogues have been applied. A calculation method for the cylinder liner vibration damper, developed as a result of the study, has been discussed. Electrical oscillation damping filter design methods basing on the Bessel, Batterword and Chebyshev polynomials have been used. The course of the experimental examinations has been described and their results have been presented. Validation of the developed method has been executed applying measurement results concerning the parameters of Diesel engine cylinder liner vibration with various elastic elements. The results of the authors’ own, theoretical and experimental, examinations have been confronted with those obtained by other scholars.
Highlights
Cylinder line vibrations bring about the occurrence of cavitation in cooling systems of ship Diesel engines [1, 10] especially in the medium- and high-speed ones
In literature the solution to the problem of cylinder liner vibrations, and at the same time protection of their cooled surfaces, is realized throughout mathematical models of the studied process reflecting with the highest probability real operational conditions of cylinder liners [5, 12, 16], including the application of simulation [13] with ANSYS software[11], vibration analysis based on clusters [17] and the method of finite elements [6]
The results of studies on natural vibration parameters of cylinder liners of the 4Cz8,5/11 type engine in Elektronics Workbench virtual environment turned out to be similar to experimental results obtained during the study at an experimental stand on a technical scale, with simple measurements of actual liner vibrations and results from other studies close to those obtained in [7] and about ten times below those given, among others, in Table 5 in [17]
Summary
Cylinder line vibrations bring about the occurrence of cavitation in cooling systems of ship Diesel engines [1, 10] especially in the medium- and high-speed ones. From the identity of equations of the mechanical system and the similarity of the electrical one results that the inductance L corresponds to mass m; electrical charge q to displacement x; electrical resistance R to dissipation coefficient b; electrical capacity C to rigidity k; voltage e to force f. It is the first form of the analogy. Elasticity and dissipation of particular cylinder liner rings of a form of two-terminal networks characterising mass, energy dissipation and rigidity, a string of decomposed elements of Diesel engine of the 4Cz 8,5/11 type the studied cylinder liner was constructed.
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