Remote control of nonlinear motion for mechatronic machine by means of CoDeSys compatible industrial controller

Navedeni članak opisuje hardversko-softverski kompleks čiji je cilj naučiti studente kako daljinski upravljati mehatroničkim mehanizmima putem standardne industrijske automatizacije. Svrha ovoga rada je razmotriti sljedeće probleme: upravljački algoritam gibanja zakrivljenom putanjom, odgovarajući razvoj softvera za industrijske regulatore koji koriste CoDeSys okruženje, primjenu CoDeSys programskog paketa za razvoj interaktivnih HTML-aplikacija s web-sučeljem.The given article describes the hardware-software complex aimed to teach students how to control the mechatronic mechanisms remotely by means of standard industrial automation. The purpose of this paper is to consider the following problems: the curved trajectory movement algorithm control, the corresponding software development for the industrial controllers using CoDeSys environment, CoDeSys software package usage for the development of interactive HTML-applications with WEB-interface

Analysis of Errors of Piezoelectric Sensors used in Weapon Stabilizers

Effectiveness of operation of a weapon stabilization system is largely dependent on the choice of a sensor, i.e. an accelerometer. The paper identifies and examines fundamental errors of piezoelectric accelerometers and offers measures for their reduction. Errors of a weapon stabilizer piezoelectric sensor have been calculated. The instrumental measurement error does not exceed 0.1 × 10−5 m/s2. The errors caused by the method of attachment to the base, different noise sources and zero point drift can be mitigated by the design features of piezoelectric sensors used in weapon stabilizers

Experimental Investigations of a Precision Sensor for an Automatic Weapons Stabilizer System

This paper presents the results of experimental investigations of a precision sensor for an automatic weapons stabilizer system. It also describes the experimental equipment used and the structure of the developed sensor. A weapons stabilizer is designed for automatic guidance of an armament unit in the horizontal and vertical planes when firing at ground and air targets that are quickly maneuvering, and at lower speeds when firing anti-tank missiles, as well as the bypass of construction elements by the armament unit, and the automatic tracking of moving targets when interacting with a fire control system. The results of experimental investigations have shown that the error of the precision sensor developed on the basis of a piezoelectric element is 6 × 10−10 m/s2 under quasi-static conditions, and ~10−5 m/s2 for mobile use. This paper defines metrological and calibration properties of the developed sensor

Optimal Design Parameters of Thermal Flowmeter for Fuel Flow Measurement

The article analyses the influence, relationship and value of the design parameters of the thermal flowmeter on its radial and axial heat fluxes in the tube. The purpose of the analyses is to check the change in the error of fuel flow measurement by the thermal flowmeter directly on the vehicle when using heating elements of different diameters. The influence of the radial heat flux of the flowmeter tube on the accuracy of fuel flow measurement is substantiated. Recommendations on the choice of design parameters of a thermal flowmeter at the stage of its design, development or use are developed under the condition of reducing the influence of the radial heat flow on the axial one, which will reduce the total error in the measurement of fuel flow rate

Modeling of voltaic pile surface formation using current-carrying cassini ovals

In this paper, the possibility of increasing the surface of an electric discharge in ignition devices of a working mixture of internal combustion engines is analyzed. There are results of simulating the change in the shape of the lower end of the spark plug central electrode from the flat to conductive Cassini ovals. The obtained results have given possibility for creating an extended electric discharge surface in the form of voltaic piles with a cross-section in the form of Cassini ovals. Extension of electric discharge surface makes it possible to increase spark gap, to create additional two axes of concentration of thermal energy and simultaneously to increase the air-fuel mixture flammability efficiency. Keywords: Spark plug, Cassini ovals, Voltaic piles, Fuel mixtur

Effect of Acoustic Shock on Submarine

The carried-out analysis of the dynamics of a submarine body’s translational motion affected by an acoustic shock in the ideal medium provides for the possibility to evaluate the physical properties of the medium and elastic properties of the external body of the submarine to the value of limited motion of a submersible vehicle. The results of analysis provide for the possibility to conduct a comparative analysis of the submersible vehicle’s translational motion affected by an acoustic shock, taking into account the peculiarities of the motion medium, or rather taking into account the viscosity of the real medium. In this work, evaluative measurements of the features of moving the layout of the submarine were carried out. The limiting values of the displacement of the layout of the submarine are established for the case of the presence of an external artificial diffuse disturbance. A fluid with air bubbles from a compressed air cylinder was used to create an artificial diffuse perturbation. Such conditions are possible with intensive local bombardment or the presence of other high-speed underwater vehicles involved in local underwater operations

Aerodynamic Drag Study of the Heat Exchange Equipment with Different Fin Geometries

This article is devoted to the method of numerical modelling of aerodynamics when the air flows around fins of a special design, which is implemented in SolidWorks Flow Simulation. The study was carried out for three types of rib orientation, and the aerodynamic drag coefficients were determined for different values of the Reynolds number. It was confirmed that the drag coefficient values depend significantly on the flow regime. The lowest value of the drag coefficient is observed when the fins are oriented from a larger diameter to a smaller one. In the laminar regime (Re CX = 1.04, in the transitional regime (2300 CX = 0.74, and in the turbulent regime (Re > 10,000), CX = 0.22. Characteristic for this case of orientation is a significant decrease in the drag coefficient during the transition from laminar to turbulent regime; the minimum is observed at the flow speed in the range between 2 and 3 m/s

Investigation of Optimization of Combustion Processes in the Engine of Combat Vehicles by Use of Disk Structure

This work analyzes the possibility of a provision of force-majeure mode of the combat vehicles with the aid of disk construction installed in the baffler, the base of the operation of which is the method of residual cyclical quadratic chain code of construction of the “windows” of the movable disk. To determine the optimal parameters of the moving disk of the rotor system, mathematical modeling was performed. The results of mathematical modeling were used to create a PC-based calculation program. The calculation was performed for the rotational frequency ω = 300 s−1 andfor harmonic numbers from 1 to 100. The waveforms used in simulation were as follows: quasi-trapezoidal and rectangular. It is established that at the number of “windows” m = 276 in the moving disk of the rotor system the radiation spectrum acquires a uniform distribution. The object of the research is the process of extreme burning of fuel material in the combat vehicles’ engines, ensuring, according to the technical possibilities of the engine, the implementation of the force-majeure mode of the combat vehicle in the whole. The quantitative and qualitative criteria of fullness of fuel material burning in the engine are chosen as the basis for the evaluation of the reaching of the force-majeure mode. The “flat noise” of the efflux is chosen as the basis of this evaluation. This method ensures the construction of the stochastic structure of “flat noise” in the engine efflux and, in that way, confirms the possibility of technical implementation of the force-majeure mode. The rotor system further ensures not only the force-majeure formation, but also reaches the minimum noise of the combat vehicle at the change of its dislocation. The research results can be further used to optimize the design of exhaust systems, which will reduce emissions

Features of control processes in organizational-technical (technological) systems of continuous type

Technological complexes of various industries are characterized by certain modes of operation (technological regulations), which correspond to the set of variables of different nature, which have a high-dynamics of change and determine the main technical and economic performance of the object. The aim of the research is to identify information software approaches to support decision-making in organizational-technical (technological) systems. Research results are obtained through grouping, generalization and comparison methods. The scientific significance of the results are to determine the objective need to use intelligent decision support subsystems to quickly manage complex organizational-technical systems based on both: clear and formalized data and knowledge and high-quality fuzzy estimates