РАСЧЕТ ПАРАМЕТРОВ УПРУГОГО ПНЕВМАТИЧЕСКОГО ЭЛЕМЕНТА, ВЫПОЛНЕННОГО В ВИДЕ ЦИЛИНДРА С ОГРАНИЧЕННОЙ РАДИАЛЬНОЙ ДЕФОРМАЦИЕЙ

Abstract

The reasons for the occurrence of vibrations in engineering constructions and their effect on the operability of mechanisms are considered It is determined that one of the main sources of vibration of machine elements are plain bearings, in which the shaft is located in the hollow bar (liver) with a gap, there is a struck at the selection of it. The principle of vibration protection systems is considered, the main element of which is the elastic element - shock absorber. The influence of the rigidity of the elastic element on the performance of sliding bearings is analyzed. The design of an elastic pneumatic element of increased stiffness, made in the form of a cylinder with limited radial deformation, is given. It is shown that the ability of such an element to center the shaft relative to the geometric axis of the support under the action of a radial load is provided by the appearance of a difference in contact area between the outer surface of the bearing housing and the surface of the elastic cylinder. A technique is developed for calculating the increment of the contact area of an elastic element, made in the form of a pneumatic cylinder with limited radial deformation, with a surface through which the external load is transmitted at specified support parameters: the length of the cylinder and the amount of excess gas pressure inside the cylinder. It is believed that the shaft is in the bearing without a gap, and the shell forming the cylinder is inextensible. It is established that the deformation and rigidity of an elastic pneumatic cylinder with limited radial deformation depend on its length and the magnitude of the excess pressure inside the cavity. The obtained mathematical dependencies allow defining and setting parameters of an elastic pneumatic element made in the form of a cylinder with limited radial deformation (cylinder length and the value of excess gas pressure inside the cylinder) depending on operating conditions of the sliding bearing.