Theory and Experiment Study on Accumulator Absorbing Pressure Pulsation without Taking Account of Its Entrance Characteristic

摘要

Accumulator is one of the key auxiliary components in hydraulic systems, mainly used for storing and/or temporarily absorbing hydraulic energy and could have a significant influence on system dynamics. With the creation of energy regeneration concept for hydraulic systems, accumulators will play more important roles in hydraulic systems. Modeling an accumulator and selecting parameters properly are two major challenges in design hydraulic accumulators adequately for accurately and precisely analyzing interested performance of an accumulator in a hydraulic system. In this study, an accumulator was modeled using two major sub-systems of fluid and gas chambers for analyzing the bladder dynamic behaviors, including its effects on system pressure shock and pulsations. This model was aimed at revealing the relationships between accumulator physical parameters and the accumulator performance under various operating conditions, and was implemented in Simulink(R) environment. In simulation analyses, square-waves were used to represent the pressure shocks and sine-waves were used to represent the system pressure pulsation. Both the square-waved pressure shocks and sine-wave pressure pulsations were input to the Simulink(R) for simulation analysis. By validating the simulation results against laboratory test results, authors found that the developed accumulator model could be used as an effective tool for systematically selecting design parameters for a hydraulic accumulator in various applications and under different work conditions. This paper will present both the theoretical design of the accumulator model, the implementation of simulation analysis using the developed model and the results obtained laboratory validation tests.