Search results

The minimum of number of operations for a polynomial calculation is found. Results are presented as proofs of one lemma and one theorem.

Analysis of the causes of errors of measurement of phase shifts of harmonic components in electrical railway traction networks and describes how to improve the accuracy of measurement.

The article discusses the control systems for mechanical vibrations on the basis of improved modernized nonlinear inverse dynamics algorithms and its use for vibratory stands of technical diagnostics to diagnose mechanical products of railway transport systems.

Development of innovative methods and hardware gives additional opportunities for the solution of various tasks. For example, innovations allow increasing safety in places of crossing highways and railroads by means of detection methods of objects in the required control zone. The big risk of emergencies in places as a railway crossing is caused by a high speed and the inertial movement of the train. In this connection, there is no possibility of timely braking of the train and prevention of collision with an obstacle. At the present time, the biggest percent of accident rate belongs to uncontrollable railway crossings. On such railway crossings completely are absent the blocking means or the warning technical tools. Controlled railway crossings are equipped with the blocking means for the automobiles. Also, they are equipped with the systems of video supervision. But the current systems of video supervision have no function of informing the driver of the train in an emergency. Therefore, to priorities belongs development of technical requirements for a hardware and software system. The automatic analysis of a dynamic situation in borders of a railway crossing, transfer to the driver of the approaching train of the required information belongs to priorities too. This work describes briefly main algorithms of computer vision which allow distinguishing any object on a railway crossing. The example of algorithmic modeling of detection of contours and allocation of a background on video has been considered in this work. Received results led to the conclusion about a necessary adaptation of modern computer vision algorithms for the solution of a detection problem of various objects with the required accuracy and in various working conditions.

This article describes the algorithm for polynomial interpolation analog-to-digital converter with a duration of calibration1 ms. There is an example of reconstruction the missing values for a given accuracy of processing the input signal

In this article a shielding effectiveness calculation method for the radio electronic equipment is considered. Monolayer and multilayer shields made with aluminum, cuprum, steel is investigated. Interaction of pulse magnetic field and conductive shield is simulated using finite difference time domain method. Frequency and time dependencies for the shield impedances are shown. Also pictures of electromagnetic field distribution near shielding are presented. Time dependencies of electric field on the shield external and internal borders are shown.

This article describes the approaches to extract from the video sequence of areas relating to movable objects, which may cause a dangerous situation at a railway crossing. The proposed approach will improve the quality of the mobile object allocation, which will reduce the time image processing to identify moving objects in order to determine the degree of risk. To assess the quality of algorithms was develop a software product and simulated motion capture.

The technique of a prediction of coefficient of Hurst on the basis of various ways of a prediction is offered. For a choice of a method of a prediction errors of underestimation and revaluation are entered. It is shown that if not to consider fluctuation of value of coefficient of Hurst, the demanded parameters of a multiservice network, the allocated resources of a network used for calculation or will be insufficiently for high-quality service of the arriving traffic (that is QoS indicators will worsen), or resources of a network will be inefficiently used.

Under consideration the method to determine the positive and negative sequences of fundamental voltage and current harmonic in the three-phase power supply systems, based on the Clark transformation and adaptive filtering.

The method of practical realization of decision of the special case of a transport task is examined. It allows to find optimal and the set amount of routes the nearest to it on the size of criterion of optimality. A method provides large flexibility in the decision of questions of planning of optimal organization of vehicular process at making, both strategic plans and operative plans in case of origin of situations of type "accident", "congestion", or other force-majeure circumstances.

The article covers stability and accuracy for restoration of uneven sampled signals, using basis functions. The accuracy and stability are explored for different transfer system orders, period between basis functions and offset of the basis functions system against restored samples.

The article is devoted to checking the validity of the hypothesis that the information on a user's computer system, obtained on the basis of covert monitoring of standard peripherals allow timely recognize disloyal behavior and prevent the realization of the internal threats to information security, which is important for the information systems of rail transport.

The article describes two methods to estimate the rotor speed of the induction motor using special spectral components generated by the engine design. After you search for these components is possible to estimate the rotor slip. The aim is to compare these methods under different engine loads and to determine the most accurate method. The result is program algorithm for determining the rotational speed of the rotor of an induction motor, which can be used for a variety of practical tasks that require precise definition of speed, but there is no any access to moving parts to install the speed sensor or the use of sensors is undesirable revolutions.

The paper presents a comparative analysis of different methods of quantization of continuous signals, including optimal with the maximum entropy and the entropy – suboptimal, with various parameters of signal distribution.

Is executed the analysis of the special features of the territorially distributed objects of rail transport for developing the systems of video surveillance and video registration. Is proposed the three-stage design procedure of such systems, at basis of which lies the separation of entire system into the zones of video surveillance, zones of video registration and the information clusters, which ensure the optimization of system on the criterion of minimum expenditures.

The article outlines the principles of quantitative evaluation of information security from the viewpoint of the theory of games. Definitions of the game matrix and its quantitative interpretation. Offered practically implemented method of analysis, planning and design of information security based on the proposed models.

In microprocessor automatic block signalling (ABS) systems all the basic functionality is implemented in software. Current technique used by Russian educational organisations for training of engineering staff is solely based on functionality exploration of the microprocessor ABS equipment. We suggest that this approach is not sufficiently effective and could be improved. In our view, the improvement could be achieved by addition of extensive ABS algorithm development practice to the Railway Signalling Engineering curriculum. In this article, we present a prototype of a special microprocessor learning board, which supports development and debugging of various ABS algorithms. Along with the functional diagram, we give some technical details and present preliminary results of implementing and using this prototype.

In this paper we study the problem of interpolation signals neutral convolution vector. We propose an interpolation method, which has the best result in terms of even distribution of interpolation errors in the spectral region. Presents the results of a numerical experiment. The effectiveness of the proposed method in the sense of improving the accuracy of a discrete signal recovery in the receive path of the communication of railway equipment.

The authors analyze the information security of modern technology of computer networks wireless communication. The analysis of international providers and statistics for multiple violations of the basic standards of safety and conclusions on their safety. Key recommendations are deploying Wi-Fi networks for infrastructure of railway transport.

The article describes the structural scheme, the algorithmic basis, functional composition and some technological characteristics of the hardware and software of information system of operating control parameters of the electric power in the traction power supply network, structural peculiarities of information-measuring complex, the hub characteristics of the data collection substation, type of equipment used in information and computational complex structure of servers for processing and storage, data volumes and characteristics of the necessary communication lines.

The current state of technological radiocommunication systems was analyzed, prospects of their development were shown in the article, and the necessity of further use of analogue radio communication channels was substantiated. Statistical data analysis of radiocommunication equipment failures used on the South Urals Railway is fulfilled.

The structure of a complex of locomotive safety devices (CLSD) is analyzed. A comparison of technical characteristics and design features of ground stationary and transport antennas of the receiving equipment of the global satellite radio navigation system (SRNS) is made. On this basis, the importance of using SRNS in the CLSD structure is shown. It has also been shown that the decrease in locomotive positioning errors associated with the need to increase the signal-to-noise ratio at the input of the receiver can be achieved by the use of active phased array antennas (APARs). APAR are able to form narrowly directional patterns with the commutation of their maximum directions in accordance with the coordinates of the constellation's navigation satellites. Features of the formation of narrowly directional patterns and the possibility of controlling them in a linear and flat uniform APAR are considered. It is shown that the use of APAR in the ground-based equipment of the user is associated with the need: a) changing the approach to designing it for specific applications, - a flat surface of the required size should be provided in the design; b) the modernization of the algorithm for receiving and processing SRNS signals, which must take into account the finite switching time of the radiation patterns, the angle of the mask, the number and coordinate distribution of the navigation satellites in the working constellation.

Now there is no efficient decision to estimate a corrosion condition of an underground part of reinforced concrete support of contact network which is not demanding digging of a support. This problem makes actual a task of development of a hardware and software system of definition of a corrosion condition of an underground part of reinforced concrete support of contact network. As a result of work the software module allowing to realize panoramic shooting of an internal surface of an underground part of a support, to increase quality of the received images, to carry out searching of inhomogeneities and to determine their geometrical parameters, and also to make the analysis of the found inhomogeneities. Implementation of results of work will allow to reduce time and labor costs, and also to increase efficiency of diagnostic works on support of contact network.

Is executed the analysis of the special features of the process of the optimization of the complex systems of video surveillance and video registration in the territorially distributed objects of rail transport. Is proposed the procedure of setting optimization problem during the local level for the group of adjacent clusters into supers-clusters and the step-by-step optimization of entire system at the global level. The procedure of two-level optimization and the association of the adjacent information clusters of system into the supers-cluster make it possible to combine the methods of linear and dynamic programming for the optimization of the complex branched systems on the criterion of minimum expenditures.

In the context of the objectives of and compliance with transportation of corridors for rolling stock and improving the technology of transportation of different modes of transport considered minimization of the geometric factor in positioning navigation, peculiarities of determination of errors of coordinate of the moving objects along physically fixed trajectories on the plane, it is proved the statement about the possibility of recovery of the trajectory of the mobile point on the plane with continuous or discrete measurements of one coordinate.