Mathematical model of dynamic characteristics of a hydraulic drive with distributed parameters taking into account the influence of the temperature factor

This article presents a modified mathematical model of the dynamic calculation of a hydraulic drive with distributed parameters, taking into account wave processes, fluid flow regime (laminar, turbulent), operating conditions (temperature, dustiness in the air, temperature drop, solar radiation, low humidity) and a model of thermal processes in a flow hydraulic drive. Comparative analysis of the results of theoretical and experimental studies showed the adequacy of the proposed dynamic calculation model to real hydraulic drive processes. The average deviation of the results obtained by the proposed dynamic calculation model with distributed parameters is 2.8%, which is 3-6% better than other methods. The most effective use of the proposed mathematical model of dynamic calculation of a hydraulic drive with distributed parameters is to study transient processes in lines over 3 m long. The proposed mathematical model describes quite well the effect of the temperature factor on the dynamic characteristics of the hydraulic drive section. The average deviation of theoretical data from experimental data at T = 20°C and T = 100°C was 3.2% and 5.1%, respectively. It was found that when the temperature of the working fluid changes from -40°С to + 20°С, the time of the transient process of the hydraulic drive and the response time decrease. When the temperature of the working fluid changes from+20°С to + 100°С, the time of the transient process of the hydraulic drive decreases, and the response time increases.

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