FEASIBILITY STUDY FOR SHIP TRAJECTORY PLANNING PROBLEM USING MARINE WEATHER DATA FROM SATELLITES
V.M. Grinyak, D.A. Akmaykin, Y.S. Ivanenko
The paper is devoted to the problem of optimal path planning for long-distance navigation of vessels. It is stated that the weather conditions on the route have a significant effect on the vessel’s movement. In this regard, it seems expedient to solve the optimization problem taking into account dynamically, taking into account the current and forecasted weather on the route and the technical capabilities of navigation in heavy weather. The authors propose using weather information obtained with the help of special meteorological satellites for this purpose. At the same time, an important question is the answer to the question of the characteristic age of meteorological data obtained in this way. In order to get an idea of this aspect of the work of meteorological satellites, the problem of modeling the motion of an Earth satellite in the classical representations of celestial mechanics is presented. At the same time, estimates of the age of weather data at the Earth’s surface are obtained depending on the geographical latitude of the site and the characteristics of the sensors and orbit of the satellite. An approach to the selection of meteorological satellites for collecting weather data on the planned route of the vessel is proposed. Based on the modeling results, a conclusion is made about the constructive feasibility of the idea of planning the ship’s route, taking into account the weather data by existing technical means.
Keywords: vessel traffic control, path planning, satellite motion, weather satellite, weather data, data age, exponential distribution.
THE DEVELOPMENT OF A SUBSYSTEM OF CAD FOR THE ANALYSIS OF SCATTERING PROPERTIES OF OBJECTS WITH ABSORBING COATINGS BASED ON FACETED MODELS
Abbas Jassim Hussey, A. P. Preobrazhensky
This paper considers the problem of scattering of electromagnetic waves on the object, which is a plate coated with an absorptive coating. The system of integral equations was recorded, which allows us to associate a density potential, Green’s function and the incident electromagnetic wave. After solving the system of equations based on the method of moments were calculated values of the effective area of the dispersion under certain conditions of observation. Based on the view object, that use the facet model and gives suggestions for characteristics of a subsystem of CAD, in which you can carry out the design of objects with the required values for the levels of scattered electromagnetic fields were obtained. As input to this subsystem can be used the sizes of the facets, the sector angles, the required level for the characteristics of scattering of radio waves.
Keywords: scattering of radio waves, facet model, CAD, radar cross section, absorption of radio waves.
STUDY OF THE BOUNDARY OF THE TANGENTIAL BIFURCATION IN DETECTOR OF PERIODIC SIGNALS, BASED ON CHAOTIC OSCILLATOR
T. V. Patrusheva, E. M. Patrushev
The article considers a method for detecting periodic signals under the background of random interference. The implementation of the detector on the basis of a non-autonomous chaotic oscillator is proposed. The authors have justified choosing a tangent bifurcation as the basis of the detection mechanism. It is assumed that in the absence of a detectable signal at the input of the chaotic oscillator, its operation mode will be chaotic, and if it is available, a periodic mode will be established. A numerical model of the detector in Matlab / Simulink is implemented, which implements a system of differential equations for the chaotic oscillator Murali-Lakshmanan-Chua. As an informative parameter of the detector, the amount of chaotic emissions during the detection period was chosen and theoretical dependencies for it were presented. The proposed model allowed to carry out statistical studies of the boundary of chaos and periodic oscillations for the chaos generator under the influence of random narrow-band interference. Based on the dependencies obtained, the optimal parameters of the system were selected. The study as a whole made it possible to conclude that the proposed detector can be used as a node of devices receiving an information signal against a background of non-stationary interference.
Keywords: ichaotic oscillator, periodic signals detector, intermittency, tangential bifurcation, non-stationary interference.
PEDESTRIAN MOTION TEST MODEL
The results of the development and analysis of a simple and intuitive pedestrian motion model designed for the formation of measurement data in the path calculation channel of the pedestrian strapdown inertial navigation system (SINS) have been presented. This model, together with the measurement errors model of SINS, allows testing various algorithms for channel measurements processing and evaluating the potential accuracy
of determining the current coordinates of a pedestrian for various variants of its movement. The mathematical description of the model has been given. The results of the modeling, that show the convenience of using the model and high accuracy of calculations, have been presented.
Keywords: pedestrian model, inertial navigation, path calculation, human gait.
MODEL FOR CONTROL DYNAMIC OBJECTS
S.V. Ippolitov, О.N. Choporov, D.V. Lopatkin, A.V. Sizov
The work is devoted to the solution of the actual scientific and technical problem related to ensuring the required accuracy of control in a group in the automatic mode. The technique for synthesizing an algorithm for automatic control of fast moving dynamic objects in their joint motion based on the theory of covariance control is presented. The essence of the theory is to provide a given steady-state value of the covariance matrix of the state of a linear system by means of feedback. The approach is substantiated and a numerical algorithm for determining the achievable covariance matrix of the system formalizing the specified requirements for the accuracy of control in the group flight mode in terms of the RMS errors of the controlled parameters is developed. The numerical algorithm for solving the synthesis problem of an achievable covariance matrix is based on the method of solving linear matrix inequalities (LMI), using the cvx package of the Matlab system. A general linearized model of the relative motion in the group is developed, taking into account external perturbations of the turbulence of the atmosphere and the random wind and internal disturbances associated with the dynamics of the control system drives. To take into account the influence of a random wind, the Dryden model, which describes the turbulence of the atmosphere, is used. On the basis of the described mathematical model and the developed algorithm, numerical modeling is carried out to evaluate the accuracy of control under the influence of perturbations.
Keywords: dynamic objects, synthesis, algorithm, control, matrix, modeling.
MODELLING OF FRICTIONAL CONTACT AND LUBRICATION INFLUENCE ON TRIBOLOGICAL CHARACTERISTICS
Performed investigation goal is analysis of lubrication influence on frictional characteristics using boundary friction model. This model bases on Gercy – Streebeck curve, i.e. frictional coefficient dependence from Sommerfeld number. This modeling shows that wear and pollution of frictional contact reduce lubricating ability and efficiency because of boundary friction at wearing and viscous friction at pollution. Correspondent change of engine characteristics depends on used oil quality, dopant choice and frictional contact state. To estimate the influence of these factors some math models were created that characterize contact state on friction. Criterial model based on similarity theory allows perform wear forecasting and some standards synthesize for qualification tests. Lubricant influence on wear conditions on hardness reducing because of Rebinder effect. Estimation of corrosion wear influence based on equilibrium condition for corrosion solution and dissolved material diversion.
Keywords: internal combustion engines, frictional contact, motor oils, thermo – stabilizing dopants, Gercy – Streebeck curve, Rebinder effect, similarity criteria, frictional wear, corrosive wear.
THE TECHNIQUE OF CALCULATION THE PARAMETERS OF THE ELECTROMAGNETIC THE FIELDS SCATTERED BY THE BODY WITH COMPLEX FORM IN THE NEAR ZONE
The paper is based on the methodology that uses the representation of an object of complex shape as a set of facets, we investigate the characteristics of scattered by this object in its near zone. It is shown how, using the calculated data to explore the effect of the spatial configuration of the field on the accuracy of measurement of angular coordinates of the object. The calculated dependence of the relative field amplitude of the object and the plate from the corner for the near zone to the far zone. The graphical analysis of the dependencies shows that in addition to monotonic attenuation length fields exist oscillating damped oscillations. It is believed that the antenna is moved around the object at random are averaged over all viewing angles characteristics of the scattered field. After calculating the parameters of the distribution law of a random variable from section to section, we can conclude about how changing the process in time. The analysis demonstrates that when we move from the far zone to the near, there is a shift of peak values of amplitudes and is an extension of the main lobe of the secondary radiation. The histograms of the distributions of amplitudes and phases of a complex object, after analysis it was found that the distribution of instantaneous values of the amplitudes of the scattered field by the object is described by Rayleigh. If we consider the distribution of the instantaneous phase of the scattered field, the shape of the histogram is close in form to the histogram of a uniform law. The analysis of the results allows to assert that the regularities of the distribution of values of amplitudes and phases of the scattered field related to the far and near zones will be the same.
Keywords: complex object, electromagnetic wave, near zone, scattering, diffraction.
MOBILE OPERATIONAL GROUPS IN COMMUNICATION AND CONTROL SYSTEMS
D.M. Sonkin, M.A. Sonkin, A.A. Shamin, V.Z. Yampolsky
The purpose of this article is structure declaration and composition of the hardware and software of a navigation and telecommunication complex of new generation for communication and control of mobile task forces. Methods of systems analysis, simulation modeling are used. The developed complex passed successful tests in the Tomsk region and is ready to delivery to other regions. Relevance of researches is caused by need of creation of new hardware and software solutions for creation of a navigation and telecommunication complex of new generation for the purpose of increase in efficiency of monitoring systems and control of hardly accessible objects and mobile groups. Article is directed to disclosure of problems of creation of such systems, to publications of experience and approaches to creation of the integrated monitoring systems, communications and controls for the purpose of extension of the sphere of their application in economy and in law enforcement agencies. Article contains synthesis of the got experience of development and implementation of a navigation and telecommunication complex of the new generation using achievements of microprocessor technique and hardware and software of the modern communication systems, monitoring and control.
Keywords: Navigation and telecommunication complexes of a new generation, mobile operational groups, communication channels, satellite systems.
THE ALGORITHM OF ESTIMATION OF EFFICIENCY OF ACTIVITY OF EDUCATIONAL INSTITUTIONS OF SECONDARY PROFESSIONAL EDUCATION IN THE FIELD OF CONSUMER COOPERATION OF THE RUSSIAN FEDERATION
E. P. Boldyreva
Currently, the issues of quality management of educational institutions has received considerable attention at different levels: Federal, departmental, individual educational institutions, educational programs. The particular relevance of this activity becomes, in the light of increasing international integration in the field of education. For the solution of strategic and operative tasks of quality management of preparation of experts developed an algorithm for evaluating the performance of educational institutions in the field of consumer cooperative societies. During the selection process important criteria a survey among staff and students of the educational institution. On the basis of the method of Saaty defined utility function for each group.
Keywords: consumer cooperation, the system of education quality, assessment of efficiency of activity, educational organizations, the criteria for assessing the quality of activities, the formation of the utility function, the analytic hierarchy process.
THE PREDICTION AND OPTIMIZATION OF THE SYSTEM OF TRAINING IN THE FIELD OF OPERATION OF AIR TRANSPORT ON THE BASIS OF THE PRINCIPLES OF DUALITY AND EXPERT STATISTICAL MODELING
A. S. Borzova, V. G. Tsipenko
The paper discusses the challenge of improving the efficiency of the training system in the field of air transport. As the conceptual foundations of model-oriented approach to forecasting and optimization, this system is considered the principle of duality and multistep use of models. Optimization modeling is a partial implementation of the principle of duality due to the mechanisms of achieving efficiency of the training system: the reduction and transformation and the creation of the Bank’s professional activities on the one hand associated with the characterization of work functions in the professional standards, and with another – reflects the formalized components of educational resources that are aimed at the formation of certain competences of personnel in the field of operation of air transport. As the main form of statistical information defining changes in the training system, it is proposed to use a time series of volume indices of the needs of the labor market in specialists with higher education and graduating from universities. Specified approaches for the calculation of forecasting evaluations with different quality. After receiving the results of forecasting on the basis of expert information are invited to build valuation models and conduct selection method that has the highest priority for this model.
Keywords: optimization, training, air transport, modeling.