Кафедра "Системний аналіз та інформаційно-аналітичні технології"

Постійне посилання колекціїhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/7644

Офіційний сайт кафедри http://web.kpi.kharkov.ua/say

Кафедра "Системний аналіз та інформаційно-аналітичні технології" заснована в 1982 році.

Кафедра входить до складу Навчально-наукового інституту комп'ютерних наук та інформаційних технологій Національного технічного університету "Харківський політехнічний інститут". Випускники кафедри працюють у провідних ІТ-компаніях: EPAM, CloudWorks, DataArt, MedeAnalytics, NIX Solutions, CodeIT, Ciklum та багатьох інших в Україні та за кордоном.

У складі науково-педагогічного колективу кафедри працюють: 4 доктора технічних наук; 9 кандидатів наук: 8 – технічних , 1 – економічних; 4 співробітника мають звання професора, 9 – доцента.

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About stability of the movement of the refueling vehicle equiped with digital system of brake forces distribution during the emergency braking
(Національний технічний університет "Харківський політехнічний інститут", 2021) Aleksandrov, Ye. Ye.; Aleksandrova, T. Ye.; Morhun, Ya. Yu.
The impact of enforced oscillations of the free surface of fuel in the car tank on the stability area of a closed digital brake force distribution system is considered. The object of the study is the process of stabilized movement of the tanker during the emergency braking. The subject of the study is a large tanker with a gross weight (3-3.5) *104 kg, equipped with a tank with a volume of (17-20) m3 and a system of direction stability. The goal of the work is investigation of the impact of transported fuel fluctuations on the stability of the refueling vehicle during the emergency braking and introducing of methods for selecting values of variable parameters of the electronic brake force distribution system to minimize it. Conclusion. Considering the oscillations of the free surface of the liquid in the mathematical model of disturbed movement of a closed system of stability significantly reduces the stability area of the system in the low frequency range due to the loop, the size and position of which depend on the filling level of the tank. Need to choose an envelope loop that according to different levels of tank filling.
Parametric synthesis of the digital invariant stabilizer for a non-stationary object
(Національний технічний університет "Харківський політехнічний інститут", 2020) Aleksandrov, Eu.; Aleksandrova, T. Ye.; Kostianyk, I.
Two methods are considered for choosing the values of the variable parameters of the digital stabilizer for a non-stationary object, which ensures the invariance of the closed stabilization system to the action of external disturbances. The comparative analysis of the considered methods was carried out in order to identify their advantages and disadvantages. As an example, it is considered the problem of parametric synthesis of the digital stabilizer of the C5M cosmic stage of the Cyclone-3 carrier rocket as part of the program for the modernization of these objects created in the late 70s by the joint efforts of the Yuzhnoye Design Bureau and NPO Hartron, which contain an analog stabilization system and operating to date. It is concluded about advisability to replace the C5M analog stage stabilizer with the digital stabilizer in order to improve the quality of the stabilized process of the stage in the active part of the flight trajectory. It is shown that both methods considered in the article lead to the creation of the digital stabilizer that provides a significant reduction in the static error of the closed digital stabilization system of the cosmic stage of the carrier rocket and an increase in the quality of stabilization process.
Parametric synthesis of the electronic control unit of the course stability system of the car
(ПП "Технологічний Центр", 2019) Aleksandrov, Ye. Ye.; Aleksandrova, T. Ye.; Morhun, Ya. Yu.
The problem of parametric synthesis of an electronic control unit for a brake system of a car is considered, which consists in the process of choice of values of the varied parameters of electronic CU. The selected parameters should provide the maximum margin of stability and maximum velocity of the closed-loop system of automatic control of a given direction of car movement in braking mode. This is important because modern high-velocity cars, operating in conditions of low-quality road surfaces of highways, often become objects of road traffic accidents, despite the fact that they are equipped with anti-lock braking and traction control systems. In this regard, the design development of the latest models of automotive equipment is aimed at creating directional stability systems, increased vehicle dirigibility in case of loss of wheel adhesion with the road surface. The problem is solved using the method of "frozen coefficients", which is based on the iterative process of sequential selection of numerical values of the varied parameters of the electronic unit. In particular, it is found that the characteristic equation of a closed-loop stability control system contains three variable parameters, and the system itself is a two-channel one. The first control channel for the inclination angle of the car body contains variable parameters, and the second control channel for side skid contains a variable parameter. It is shown that 5–6 steps of the iterative process are sufficient to obtain optimal values of the varied parameters that provide the maximum safety margin and maximum performance of the closed-loop vehicle stability program. The work proves the effectiveness of the developed algorithms for parametric synthesis of the electronic control unit for a car, the simplicity of their implementation, as well as the high quality of stabilization processes of the car body.
Parametric synthesis of а non-stationary automatic control system of the course stability of the car
(Національний технічний університет "Харківський політехнічний інститут", 2020) Aleksandrov, Eugene; Aleksandrova, T. Ye.; Kostianyk, Iryna; Yaroslav, Morgun
Widely used in the practice of analysis and synthesis of automatic control systems of non-stationary dynamic systems, the method of “frozen coefficients” does not havea rigorous theoretical justification and does not always lead to the desired results. In this regard, to solve the problem of parametric synthesis of a non-stationary automatic control system of the course stability of the car, an algorithmic method is co nsidered for choosing the variable parameters of the regulators of non-stationary objects, based on the direct calculation of the additive integral quadratic quality functional that reflects the set of requirements for the automatic regulator of a non- stationary object, followed by finding the values of the variable parameters a regulator delivering a minimum of quality functional, and the required values of the weight coefficients of the additive functional.
Structural-parametrical synthesis of electronic control unit of fuel feeding system of vehicle diesel engine
(ПП "Технологічний Центр", 2017) Aleksandrova, T. Ye.; Lazarenko, Artyom
We draw a conclusion that in the fuel feed system of the transport diesel engine, it is expedient to use a two-channel electronic control unit. The selection of appropriate channel of the electronic control unit is done by the driver depending on road conditions. This scheme of electronic unit makes it possible to minimize both dynamic errors, which appear during motion of vehicle in the rough terrain, when there is a significant change in load within a short time interval, and the static errors, which appear when moving along the routes with high-quality road surface, but with lengthy ascends and descents. The proposed fuel feed system is in a certain sense universal. The channel, providing high dynamic accuracy of fuel feed control, contains ae sensor of angular velocity of crankshaft rotation of the diesel engine, and the sensors of position of fuel pump lath and the pedal of fuel feed control, the outputs of which are connected to inputs of the electronic unit, which implements a linear combination of the input signals of sensors. The channel that provides for invariance of the fuel feed system to the action of external disturbances realizes a control algorithm, which uses, in addition to the output signals of the above-indicated sensors, information about the displacement velocity of the fuel pump lath of the diesel engine. High accuracy and interference protection of the closed fuel feed system may be achieved by using a digital electronic control unit with the implementation of digital Butterworth and Lanczos low-frequency filters.
To the question of constructing the regionof allowable values of variable parameters of a digital stabilizer of a movable object
(Національний технічний університет "Харківський політехнічний інститут", 2020) Aleksandrov, Eugene; Aleksandrova, T. Ye.; Kostianyk, Iryna; Morgun, Yaroslav
Solving the problems of analysis and synthesis of closed digital systems for stabilization of movable objects is associated with significant difficulties. One of the possible ways to solve the problem is the transition from a mathematical model of a continual-discrete closed stabilization system to an approximate mathematical model of a discrete closed system using infinite matrix series containing the own matrix and the control matrix of the continuous part of the system, as well as the quantization period of the discrete part. Using the example of a closed digital stabilization system for a space stage of a solid-propellant carrier rocket flying in an airless space with a marching engine turned on, the problem of constructing stability regions of a closed digital stabilization system in the plane of variable parameters of a digital stabilizer was solved and a comparative analysis of these regions was carried out for various numbers of members of matrix seriestaken into account and different values of the digital stabilizer quantization period.