Table of content

This paper discusses the results of tests on the effect of compression ratio changes on engine start-up properties, the mean pressure of the compression stroke end and on the temperature of the compressed charge for the tested one cylinder SB-3.1 engine. The measurements were carried out at the ambient temperature 285 K.

Relations between diagnostic signal parameters and acceptable limit values of operational parameters were used to classify the states of gas turbine engines. For pre-dicting the time of faultless operation of engines we used predictive models describing the values of observed diagnostic parameters as a function of power and active opera-tion time of engines. An example was presented to show the verification of models for a preset operation time. The accuracy of predictions was estimated.

The paper presents problems of the determination of ship’s diesel engine waste heat reserves during real operating and environmental conditions. Possibilities and limita-tions of waste heat utilization in marine power systems are presented as well.

It is possible to apply an Acoustic Emission (AE) signal for diagnosing the fuel injection system of a marine diesel engine. By the signal decomposition using the wave-let method we can determine significant parameters of injection and some failures of the injection system. For the estimation of operation of selected elements the author propos-es to create a coefficient being a signal measure suitable for quick diagnosis of a failure.

This paper presents the modeling and evaluation of contact stresses in gear teeth of the camshaft drive of a Sulzer RT48T-B engine. The evaluation has been done with the MSC Nastran for Windows system. The model has been verified for the Hertz problem for a contact of two cylinders. The model made it possible to determine the value of stresses in the contact zone and in the Bielaiev point.

The paper describes a method for the estimation of parameters of a physical wave model of prismatic rubber vibration mounts for vibration isolation systems with linearly changing properties versus the frequency of forces.

Relations between wear, technical state, symptom and up/down states of a machine are presented. The concepts of the quality, efficiency and effectiveness in a company are explained. The relationship is shown between the quality in a company and the boundary values of up state and technical state.

A method of failure diagnosis of automotive gearboxes is introduced. This method is applied at the last stage of the production process during final quality control. The author describes in detail the methods of diagnostic signals processing. Moreover, procedures of diagnostic deduction and algorithms for locating a gearbox failure is presented.

In a mining ship, the tracking control system is one of its most significant systems. Its power output depends on weather parameters in the mining area and on dimensions of the ship. The tracking control system power is very high, thus the dimensions of the ship are considerably influenced by the weight and dimensions of the ship power plant. The article presents a spatial conception of a mining ship and the determined maximum power demand of the tracking control system. This article is a continuation of the prob-lem described in [2].

A plant model is used in the structure of the robust, model following control system. The article deals with the determination of dynamics of this model.

This paper presents the results of experimental and model strength analysis (by finite elements method, FEM) for water drilling platform structures. The validity of this analysis is supported by some examples.

The relation between signals measured on tunnel thruster elements and forces coming from the operation of thruster gearbox elements is shown in the paper. The pre-sented results are part of the work aimed at the development of a condition monitoring model of a marine tunnel thruster.

The global LNG shipping capacity is growing sharply and the number of ordered LNG carriers is very high at the moment. It is possible that Poland will appear among experienced builders of those ships. The author considers the requirements for propul-sion systems of modern LNG carriers, the methods of utilising boil-off gas, different alternatives of power sources. Besides, the paper introduces a preliminary idea of re-search on an optimal solution of propulsion system closely related with the size of the vessel.

The authors deal with the most important problems of the wear of metal elements in port grain silos. The properties of grains and their cereal products cause an intensive abrasive wear process in in-port transport equipment. Corrosion phenomena that occur during stoppage periods additionally accelerate the destruction of steel elements.

Basic relations useful in the reduction of Boolean models of technical systems have been presented. Elementary logical gates used in a coherent fault tree and their pro-babilistic evaluations of them have been pointed out. AExample marine system (sea water cooling system) has been analyzed with the use of the presented methodology.

There is a need for specifying a sample size in statistical analysis of, among others, marine power plant events. Sample size is not required when the collected results are not processed with statistical tools, but only are used to present observed phenomena. This work points out some of the methods of sample size determination and drawing a sam-ple. The authors describe the drawing of a sample from an unknown set, from layers, multistage, systematic and in bundles. Remarks on costs of sampling and on proportions in a sample are also given.

This article presents a method of estimating main propulsion power, electrical power and boiler capacities of modern crude oil and products tankers using statistic methods of calculations.

The paper proposes a model of diesel engine starting process as a semi-Markov process which is discrete in states and continuous during operation. The states of this process are: cold state of the engine (s1), warm state (s2) and hot state of the engine (s3). The concept of using such a model for the determination of the quantity of harmful sub-stances emitted in exhaust gases during the start up of the engine has been presented.

The author takes a stance on the role of reliability of port cargo-handling facilities. An analysis has been performed of accidents during cargo-handling operations in the port of Szczecin in a five-year period, with particular consideration of accidents where cargo-handling facilities were involved. An example of the port of Szczecin is given in determining the share of accidents caused by failure of cargo-handling facilities.

The paper contains a comparative analysis of the parametric sensitivity of rheolog-ical and physical model of elastomer vibration mounts for vibration isolation systems with linearly changing properties versus the frequency of forces.

Attempts to increase the profitability of SPI work inevitably result in the necessity of increasing the degree of utilizing waste heat from exhaust gases of marine main engines (ME). This analysis of possible use of turbo-generators is based on a comparison of available heat of ME exhaust gases with expected loads of ME, steam and electrical power consumption.

The results of analytical research concerning the use of electrical generator plants in regional heat-power stations are given. Rational designs for using waste gas from turbines in water boilers and low-pressure steam boilers are suggested. The efficiency of combined steam-gas plants working in different operating regimes is shown.

New requirements of Marpol, Annex VI and Directive 2005/33/EC imposing the reduction of SOx emission in ship’s exhausts gas enter into force in 2006. The emission of SOx can be reduced by the limitation of sulphur quantity in fuel or by means of exhaust gas desulphurization methods. The authors deal with available desulphurization methods of exhaust gases as a result of high sulphur fuel burning. Besides, problems of the operation of desulphurization installations and present limitations due to the lack of detailed regulations are discussed. Furthermore, first experiences with real desulphuri-zation systems, especially in terms of economy, are presented.

In the following paper a prototype of a new kind of constant capacity pump with pistons rotating in toroidal space has been presented. Some of the results, i.e. analysis of pressure losses in the new type of pump have been described. The results of the exper-iment can be applied while designing such a pump.

The paper focuses on problems of fuel treatment using thermal and chemical methods in the body of fuel injector

The paper deals with two methods of determining the efficiency of combined gas-and-steam power stations. For each of them examples of calculations have been quoted. These two methods permit to determine the efficiency of investigated systems as a func-tion of temperature at the inlet to the gas turbine and the compression ratio for the opti-mal steam part of the system. Calculations have been carried out concerning various structures of power stations with a single-pressure waste-heat boiler, a double-pressure waste-heat boiler with and without reheat and a triple-pressure waste-heat boiler and reheat.

This paper presents the results of numerical solutions modified by the Reynolds equation of laminar unsteady lubrication of a cylindrical slide journal bearing. The particular solutions are limited to isothermal models of bearing with infinite length, lubricated by Newtonian oil with the dynamic viscosity dependent on pressure. The dis-turbances are related with unsteady velocity of oil flow on the sleeve and on the journal. The results are shown in the diagram of hydrodynamic pressure in the dimensionless form in time intervals of displacement duration.

Characteristics of dynamic contact of hard particles which flow through a fan are analyzed in the paper. It is an elastic-plastic contact consisting of many consecutive impacts. First, the particle hits the disk, followed by hitting the fan blade and then it rebounds. The following impacts are skew and the particle may slide along the fan blade. The particle contact point with a fan blade with different values of restitution coefficient (k) has been calculated.

On the basis of operational research on the condition of selected BP lubricating oils used in auxiliary engines of the Polish Steamship Company vessels, the author analyzes and assesses the changes in viscosity, base number and flashpoint of these oils, as well as their water content and pollution.

The article introduces the results of investigations of undesirable events of marine power plants of ships belonging to various shipowners covering three years. An attempt is made to classify events, associated material losses and their causes.

This paper deals with an analysis and error estimation of geometrical interpreta-tion of circularity profile of machinery parts using non-reference methods. The obtained results were applied in the correction of polar circularity profile graphs

This paper, based on analysis of section gage logs and out-of-roundness profiles of cylindric precise surfaces and conical glands of domestic and abroad manufactured atomizers, shows the influence of production technology quality on atomizers’ reliability. Besides, some methods of increasing the reliability are offered.

This article presents a method of determination of the fuel consumption by a main propulsion diesel engine on the basis of sea trials measurements. An algebraic scheme of dimensional analysis proposed by Drabat was used for the purpose. The least squares method was chosen for the selection of optimum dimension data base. The proposed method of the determination of fuel consumption function is compared with traditional methods. Besides, advantages of proposed method are pointed out.

The paper shows properties of the follow-up system for rudder deflection using a hydraulic pump of constant delivery. Several solutions of a system using a three-point controller with dynamic feedback to enhance the steady-state accuracy are discussed. The results of simulative research are presented.

This article describes basic functions and properties of distributed control, diagnos-ing and monitoring systems using industrial networks . Examples of applications of dis-tributed systems in vessel systems are presented.

The paper presents general problems connected with the automation of ship electric power system. The author discusses individual components of this system, the structure of control and monitoring, as well as computer-aided automatic system of ship electric power plant. The requirements and functions of the devices included in the system are discussed. Finally, the structure of automated ship power plant is presented

Application of the Linear Mechanical Chains Method for the Modeling of Vibration Characteristics of Cylinder Liners in Ship's Diesel Engines

The article considers the question of obtaining a new additive on the base of nickel salts for ship’s diesel engine cooling water. The protective property of this additive re-sults from chemical nickeling of surfaces to be cooled without using any power source. The article describes the results of testing the additive on a test rig equipped with a magnetostriction vibrator.