The use of digital technologies in the systems of diagnostics and monitoring of units of a ship’s propulsion plant can significantly increase the efficiency and quality of assessing the technical condition of operated objects in the online mode as well as expand the class of practical problems to be solved. Digital processing of signals of complex configuration at a qualitatively new level is an indispensable condition for a critical improvement in the course of processing the current values of diagnosable parameters, increasing the reliability and trouble-free performance of a ship’s technical equipment during operation. A method of approximation has been discussed in the paper. Moreover, the paper provides an algorithm for analyzing the signal of the indicator diagram of a marine diesel engine, the spectrum of which contains high-frequency components and short-term pulses indicating deviations from the normal operating mode, the assessment of which is practically impossible with the traditionally applied methods of spectral analysis of signals. The approximation method is based on the use of wavelet analysis, which makes it possible to deeply explore such modes. Examples of using wavelet analysis to approximate one-dimensional signals of elements and systems of a ship’s power complexes are given.

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For marine diesel generator sets (DGS), working for a total load of variable modes of active and reactive power, their economy greatly depends on the time of day, weather conditions, ambient temperature, location, as well as flow characteristics of each set. While the total power consumed by ship systems and objects of various purposes can vary widely. In these circumstances, maintenance of efficient operation modes of DGS is possible due to the optimal distribution of the load between the concurrent DGS, at which generated electricity cost is minimized. The task of optimizing the load on generators is complicated by the significant differences in the technical, operating and economic characteristics of individual units of the system, as well as its analytical description in the presence of various regulators of complexity degree. In the presence of powerful computing setting, advanced tools and methods of numerical optimization the implementation of energy-efficient modes of DGS at a qualitatively new level through the use of digital technologies is offered to ensure. Energy-efficient algorithm of load balancing between concurrent DGS using the optimality principle of R. Bellman, allowing instead of one complex task of energy-saving for a group of k generators to consistently solve k simple task of energy-saving for each generator separately, is developed. Unlike the existing ways to implement the energy-efficient modes, DGS method is applicable for digital management (on-line) of ship's current energy network, not sensitive to nonlinearity of flow characteristics of its sets, as well as to the issue of "dimensionality curse" of ship's network. In the algorithm, the search for optimal solutions is proposed to carry out using rotation and sequential analysis technology elements in each diagonal of a matrix that simplifies the calculations. The algorithm effectiveness and correctness of the obtained results are confirmed by a specific example.

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A comprehensive solution to the problem of improving automation systems, which is associated with improving the accuracy, reliability and performance of the ship control system, with its sustainability on course, is becoming increasingly important in the face of the impact of the perturbations on it, causing a change in its course. One of the ways to solve the problem of ship's stabilization of the course is associated with the application of a dynamic model of the vessel, elements of which are discrete PID-regulators, allowing by variation of sampling intervals and their number to carry out the selection of the required parameters of the author's complexes, ensuring the stability of the vessel on the course. Converting the traditional PID regulator into a discrete regulator in dynamic ship systems based on bilinear w-transformation using functional modeling tools in the MATLAB environment is considered in the paper. The example of the ship's course stabilization system shows the algorithm of the synthesis of discrete regulator in the MATLAB environment and builds a generalized SIMULINK model to compare the dynamics of the processes of the ship dynamic system with continuous and digital regulators in the temporal area. The results of the simulation of the ship dynamic system show the asymptomatic convergence of the transition processes of the angular coordinates of the ship's condition at the interval of time, equal to the duration of the transition process in the system. It is shown that using SIMULINK and CONTROL TOOLBOX tools can improve the process of modeling discretedynamic systems at a qualitatively new level and significantly improve the efficiency of system synthesis.