Textile Pattern Design in Thermal Vision—A Study on Human Body Camouflage

This paper reports on a new approach to the creation process in fashion design as a result of the exploitation of thermal camouflage in the conceptualization of clothing. The thermal images’ main variation factors were obtained through the analysis of their color behavior in a (diurnal and nocturnal) outdoor beach environment, with the presence and absence of a dressed human body (through the use of a thermal imaging camera), such as the analysis of textile materials in a laboratory (simulating the captured outdoor atmospheric temperatures and those of the model’s skin using the climatic chamber and the thermal manikin). The combination of different patternmaking, sewing and printing techniques in textile materials, along with the study of the camouflage environment and the human body’s variation factors, as well as the introduction of biomimetic-inspired elements (chameleon’s skin), enabled the creation of a clothing design process with innovative de-sign elements which allow us to thermally camouflage the human body and take clothing beyond the visible spectrum in a functional and artistic way.

INCREASING OF AIMING AND SEARCH SYSTEM OF LAND UNMANNED COMPLEX DURABILITY

Proposals on composition of the aiming and search system of land unmanned complex are offered. The work aims to improve one of the most important technical characteristics of land unmanned complex - survivability. Proposals are given for improving the layout of aiming and search system of land unmanned complex. Existing composition schemes have a low firing life because of the devices included in its structure have are installed into general body. Sniper impact in body makes ineffective all aiming and search system. Authors proposes to install the devices into two bodies along weapon sides. TV-sight should be installed into the first body and thermal-vision sight should be installed into the second body. Then if sniper impact is affecting one body, then the devices of the second body are able to execute a battle task with some limitations thanks to efficient sight. The issues of controlling the stability of the aiming line of the aiming and search system at the stage of bench tests using a collimation-measuring unit are considered in detail. A technique for adjusting both television and thermal imaging sights is proposed. In addition to increasing the survivability of the entire unmanned complex, the proposed technical solution has a number of other advantages. First, the "cold" zeroing of the combat module is greatly simplified. Instead of a system of two penta mirrors, a BS-0 ° rhombus prism can be used for this. Secondly, the proposed layout potentially simplifies the further modernization of aiming and search system, which would require the inclusion of additional units. For example, to expand the functionality of the complex by analyzing the polarization of radiation from objects and backgrounds, an additional volume is provided to accommodate polarimetric attachments. Thirdly, an even greater increase in the survivability of the complex can be achieved by increasing the secrecy of the combat mission. Usage of the base distance between the entrance pupils of the sights makes it possible to passively measure the range to the target using the internal base rangefinder instead of the laser rangefinder.

Identification of the Effects of Fire-Wave Propagation through the Power Unit’s Boiler Island

The article presents the results obtained during the inspection of the load-bearing structure of a power unit that suffered from fire. The inspection, consisting in the assessment of both the structure’s technical condition and durability of welded joints, was performed on seven height levels of the power unit. The vibration spectrum of the unit’s steel structure was analyzed, and frequency characteristics were, thus, obtained for individual measurement levels. Thermal vision measurements were also performed in the unit’s all connection points to check for possible unsealing of some elements in the boiler island of the inspected power unit. The next stage consisted of performing strength calculations of the steel structure with a goal to estimate the structure’s stress state. The conclusions contain suggestions for modernization of welded joints in order to maintain the power unit’s design strength.

Thermal vision of fracture behavior on acrylic composites

The aim of this work was to investigate thermal properties of acrylate-based composite combined with alumina-based particles. The composites were made of poly (methyl methacrylate) (PMMA) modified with dimethyl itaconate (DMI) as a matrix. As reinforcement were used alumina particles (Al2O3) and alumina doped with iron oxide (Al2O3-Fe) modified with 3-aminopropyl-trimethoxylane (AM) and flax oil fatty acid methyl esters (biodiesel - BD). According to the thermal conductivity measurements, the highest thermal conductivity values had the composite with alumina particles with the highest alpha phase content. With the addition of modified alumina particles to PMMA/DMI matrix mechanical properties were improved (tensile strength, modulus of elasticity and elongation at break). Composite with 3 wt. % Al2O3-Fe-AM particles had the most improved mechanical properties. It was noticed that this composite, compared to PMMA, had the lowest temperature in a crack zone (10.28%) and that is due to the better stiffness and highest thermal conductivity. The results indicated that the Sobel fractured surface area is related to the crack energy, which is reflected by the temperature of sample monitored by thermal vision.