This paper considers the dependence of the influence of the gas factor of a power fluid on the physical properties of hydraulic oils. When describing the processes, the hydraulic drive should be considered as a system with lumped parameters. The work is important because the hydraulic fluid is a mixture of liquid and undissolved gas. This mixture can arise when tanking and during dynamic processes because of the different dissolution rates of gas and flow rate of the liquid in a pressure fall in some spots of power fluid flow.
This paper reports the results of study of the influence of gas content in working fluid on the dynamics of hydraulic drive of equipment for oil and gas well development. A mathematical model of the hydraulic drive obtained in the Cauchy form is proposed. The dependence of piston speed, pressure in the piston chamber of the hydraulic cylinder, and pressure in the rod chamber of the hydraulic drive on time at 0 and 8% undissolved gas content in the fluid is established.
За рУБЕжомВ статье приводятся результаты оценки технологического потенциала и возможности по добыче угля угольных карьеров в штате Квинсленд в Австралии. По данным спутниковой съемки установлены технологические показатели угольных карьеров, комплектация горнотранспортного оборудования, элементы систем разработки угольных месторождений. Сделан вывод о том, что эффект от масштаба производства позволяет держать объем добычи угля на уровне 300 млн т в год.
This paper considers a technique for monitoring the content of the undissolved gas in hydraulic systems. This technique is suitable for a self-propelled vehicle, forestry, lifting, and transport equipment. The paper presents an influence of gas content in the hydraulic fluid on the physical properties of hydraulic oils. The work is important because the hydraulic fluid is a mixture of liquid and undissolved gas. The measure test bench presenting in this paper makes it possible to understand the mechanism of monitoring the content of the undissolved gas in the hydraulic fluid.
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