МОДЕЛЮВАННЯ РОБОТИ АВТОМАТИЧНОЇ СИСТЕМИ КЕРУВАННЯ ЗЧЕПЛЕННЯМ

The analysis of the provisions of the working processes simulation modeling in the vehicle transmission is performed. The mathematical models of transmission of momentum that arises in the engine with the dependencies characterizing the process of motion of the vehicle are matched. The mathematical model of the acceleration process of a vehicle, equipped with an automatic coupling control system, is implemented. The results of modeling the operation of an automatic clutch control system during acceleration of a vehicle are obtained depending on the acceleration intensityПроанализированы основные положения математического моделирования рабочих процессов, протекающих при включении сцепления. Предложен подход, на основе которого возможна реализация математического моделирования работы автоматической системы управления сцеплением. Выполнено имитационное моделирование работы автоматической системы управления сцеплениемПроаналізовано основні положення математичного моделювання робочих процесів, що відбуваються під час увімкнення зчеплення. Запропоновано підхід, на основі якого можлива реалізація математичного моделювання роботи автоматичної системи керування зчепленням. Виконано імітаційне моделювання роботи автоматичної системи керування зчеплення

SIMULATION OF THE AUTOMATIC CLUTCH CONTROL SYSTEM

The analysis of the provisions of the working processes simulation modeling in the vehicle transmission is performed. The mathematical models of transmission of momentum that arises in the engine with the dependencies characterizing the process of motion of the vehicle are matched. The mathematical model of the acceleration process of a vehicle, equipped with an automatic coupling control system, is implemented. The results of modeling the operation of an automatic clutch control system during acceleration of a vehicle are obtained depending on the acceleration intensity

Metal-bearing fluids and the age of the Panimba gold deposit (Yenisei Ridge, Russia)

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.The Panimba gold deposit lies in the rocks of the epidote-amphibolite metamorphism facies and is confined to the exocontact zone of the Chirimba granitoid massif. Fluid inclusions in quartz and sulfides of two sites of the deposit, Mikhailovka and Zolotoi Brook, were studied by thermobarogeochemistry, gas chromatography, and chromatography-mass spectrometry. We have established that gold-quartz veins of the deposit were formed by metal-bearing Mg-Na-Cl-containing water-carbon dioxide-hydrocarbon fluids with salinity of 8-23 wt.% NaCl eq. at temperatures of 180 to 410 °C and pressures of 0.2 to 3.3 kbar. Hydrocarbons and nitrogen- and sulfur-containing compounds of the fluids can transport gold and might be positive indicators of the gold presence in quartz veins. Fluids with salinity of > 30-40 wt.% and sulfur isotope values (δ34S) of 0.9 to 6.7‰ of sulfides are the result of the action of postmagmatic solutions of the nearby Chirimba granitoid massif. The age of hydrothermal gold-sulfide mineralization of the Panimba deposit is within 817.2 ± 5.3-744 ± 17 Ma and falls in the time interval of crystallization of the Chirimba intrusion, 868.9 ± 6.5 to 721.4 ± 1.6 Ma, but it is considerably younger than the age of the regional metamorphism (996.0 ± 32-889.0 ± 26 Ma)

Ore-bearing fluids of the Eldorado gold deposit (Yenisei Ridge, Russia)

Текст статьи не публикуется в открытом доступе в соответствии с политикой журнала.The Eldorado low-sulfide gold-quartz deposit, with gold reserves of more than 60 tons, is located in the damage zone of the Ishimba Fault in the Yenisei Ridge and is hosted by Riphean epidote-amphibolite metamorphic rocks (Sukhoi Pit Group). Orebodies occur in four roughly parallel heavily fractured zones where rocks were subject to metamorphism under stress and heat impacts. They consist of sulfide-bearing schists with veins of gray or milky-white quartz varieties. Gray quartz predominating in gold-bearing orebodies contains graphite and amorphous carbon identified by Raman spectroscopy; the contents of gold and amorphous carbon are in positive correlation. As inferred from thermobarometry, gas chromatography, gas chromatography-mass spectrometry, and Raman spectroscopy of fluid inclusions in sulfides, carbonates, and gray and white quartz, gold mineralization formed under the effect of reduced H2O-CO2-HC fluids with temperatures of 180 to 490 °C, salinity of 9 to 22 wt.% NaCl equiv, and pressures of 0.1 to 2.3 kbar. Judging by the presence of 11% mantle helium (3He) in fluid inclusions from quartz and the sulfur isotope composition (7.1-17.4‰ δ34S) of sulfides, ore-bearing fluids ascended from a mantle source along shear zones, where they “boiled”. While the fluids were ascending, the metalliferous S- and N-bearing hydrocarbon (HC) compounds they carried broke down to produce crystalline sulfides, gold, and disseminated graphite and amorphous carbon (the latter imparts the gray color to quartz). Barren veins of milky-white quartz formed from oxidized mainly aqueous fluids with a salinity of 30 wt.% NaCl equiv) at 150-260 °C impregnated the gold-bearing quartz veins and produced the lower strata of the hydrothermal-granitoid section. The gold mineralization (795-710 Ma) was roughly coeval to local high-temperature stress metamorphism (836-745 Ma) and intrusion of the Kalama multiphase complex (880-752 Ma)

Acoustic radiation from a shell-encapsulated baffled cylindrical cap

An exact study of radiation of an acoustic field due to radial/axial vibrations of a baffled cylindrical piston, eccentrically positioned within a fluid-filled thin cylindrical elastic shell, into an external fluid medium is presented. This configuration, which is a realistic idealization of a liquid-filled cylindrical acoustic lens with a focal point inside the lens when used as a sound projector, is of practical importance with a multitude of possible applications in underwater acoustics and ocean engineering. The formulation utilizes the appropriate wave field expansions along with the translational addition theorems for cylindrical wave functions to develop a closed-form solution in the form of an infinite series. Numerical results reveal the key effects of excitation frequency, cap angle, radiator position (eccentricity), dynamics of the elastic shell, and cap surface velocity distribution on sound radiation