Open Circuit Fan System Stability Analysis

摘要

Fan stability can be a problem for the off-road hydraulic system designer, particularly variable speed fans. These circuits are generally a fixed displacement motor with a variable displacement, pressure controlled pump where the pump seeks a flow to match the load pressure demand. Certain parameters that determine the system stability are within the designer's control. This paper demonstrates the use of a graphical dynamic model to examine a system's stability and to see the effect of modifying parameters to optimize the level of stability. The principles applied are equally extended to other variable speed controls.