The improvement of scientific foundations for the technical theory of pneumatic elements with rubber-cord membranes: thermo-dynamic model of force and geometric characteristics of air springs

Air springs have many advantages; besides, air spring dampers hold much promise for application in car suspension systems. A thermodynamic model of pneumatic elements is proposed in this study. Unlike the standard model generally accepted at present, this one does not imply that the rubber-cord membrane is absolutely flexible, and its middle surface is inextensible. The force and geometric characteristics of pneumatic elements not depending on the temperature are considered. Two examples of mathematical modeling of force and geometric characteristics of Firestone pneumatic springs with rubber-cord membranes of bellow and rolling-lobe types illustrate the proposed method. Compared to the standard model, the accuracy of coincidence with the experimental data has increased significantly.