In recent years, a tendency is established to reduce the size of orbital spacecrafts while preserving their functional capabilities. The modern element base allows to create inexpensive Earth-sensing satellites having 1U-2U form factor, which are capable to form images of the Earth's surface with the medium spatial resolution. To perform synthesis of such optoelectronic remote sensing equipment, a relatively simple calculation technique is required. In this article, a technique has been developed to estimate an information system "Earth’s surface – atmosphere – television camera". It allows to determine the basic parameters of a lens and a matrix detector of the television camera, based on harmonization of their resolution and providing a given spatial resolution on the surface of the Earth. By using the proposed technique, a lens and a matrix detector have been selected. They provide geometric resolution of 25 m at the orbit with a height of 600 km. The resulting technical solution enables to fulfil applied tasks, for example, in agriculture, and can be implemented in a nanosatellite with the 1U-2U form factor.
Experimentally calculated component of the physical model of motor vehicle destruction under shock loading is considered. The results of the development of methods for determining deformation energy of motor vehicles, damaged in road accidents, are presented. Model of studying the processes of motor vehicle deformation and destruction under shock loading conditions is elaborated. Accuracy of deformation energy determination by crash test-based methods is evaluated using experimental- calculation method of hardness. The possibility to determine the speed of motor vehicle motion at the moment of impact with accuracy, sufficient for the practice of carrying out auto-technical expert examination is shown.
The method of compensation of output signal temperature drift in an optical methane concentration measurer has been improved, which allowed to expand the operating temperature range to +55°C preserving regulated metrological characteristics. In the proposed method, in contrast to the existing ones, compensation is made for the temperature-caused change of the constant component of the output signal not by the static polynomial, but by the functional dependency of LED optical radiation intensity change on voltage drop change in it. The improved method of compensation in the measurer using hardware and software components has been implemented, which made it possible to evaluate metrological characteristics of the measurer and its efficiency. During the experimental research of the methane concentration measurer in question, it has been obtained the value of the additional absolute measurement error of methane concentration, which does not exceed the regulated magnitude of the basic error (±0.20vol%), which fully meets the requirements for these measurers under conditions of coal mine atmosphere.
The article presents the mechatronic hydraulic drive circuit, designed in Vinnytsia National Technical University. For the mechatronic hydraulic drive a linear mathematical model is developed. The influence of the mechatronic hydraulic drive parameters on static, dynamic and energy characteristics is investigated. Optimization parameters and their variation ranges are determined. In the process of parametric optimization such combination of parameters has been found, which provides optimal values of the mechatronic hydraulic drive characteristics.
This article is devoted to the development of an automated system for the theoretical study of vibro-impact unloading of bulk cargo on vehicles – dumper trucks. The high efficiency of the technological process of unloading bulk cargo by means of the application of vibro-impact loads is determined.A high degree of intensification of the process of unloading of bulk cargo is achieved by using original vibrating and vibro-impact unloaders with a hydroimpulse drive. The system approach to the unloading technological process (unloading device, process, body, bulk cargo) is considered and an automated system of mathematical modeling of the stress-strain state of the body of a dump truck with vibro-impact unloading is developed.The finite element method in the FEM-program was used to determine the main parameters of the stress-strain state of the body of a dump truck under vibro-impact unloading. The results of automated modeling allowed us to evaluate the effectiveness of the impact of shock loads on the body of a dump truck when unloading bulk cargo, as well as the efficiency of the developed designs of vibration-resistant unloading devices with a hydroimpulse drive.
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