Investigation of internal dynamics of a two-piston air-hydraulic spring

With the development of electronic computers the possibility of investigating the work of various devices and mechanisms has reached a qualitatively new level. The speed of modern computers makes it possible to carry out investigations of the internal dynamics of various units and assemblies of high-speed caterpillar machines, in particular, suspension systems, taking into account the most subtle and complex nuances of their work. The present article is devoted to the investigation of the internal dynamics of the operation of a pneumohydraulic spring fitted with an embedded piston that allows stabilizing the value of the static course of the suspension in a wide range of temperatures. The introduction outlines the relevance of the use of pneumohydraulic suspension systems and the prospects for their application in order to increase the smoothness indicators required for machines with high power-to-weight ratio. However, along with the prospects due to the well-known advantages of such suspension systems, there are also disadvantages, in particular, instability of the characteristics of the gas when its temperature changes. The need to stabilize the static course has led to the appearance of various versions of the pneumohydraulic springs (PS), in particular, the PS with the embedded piston. However, the experience of using machines with such a configuration of the PS testifies to a violation of the stability of the static stroke. The paper investigates the operation of the PS under various loading conditions and various temperatures and shows the conditions for the appearance of the phenomenon of spontaneous change in the course of the roller. It is shown that simultaneous stabilization of the stroke at high and low temperatures is impossible and, in addition, the stabilization of the static path at low temperatures will lead to a shock motion of the embedded piston, accompanied by the transfer of high accelerations to the sprung body. The article concludes with recommendations on the choice of the rational position of the static stroke of the rod on the static elastic characteristic of PS.

high-speed caterpillar machines, caterpillar machines, pneumohydraulic spring, smooth running, study, internal dynamics