新型复式皮囊蓄能器动态性能分析

Analysis of Dynamic Performance for New Double-bladder Accumulator

为改进皮囊蓄能器的动态性能,提高其抑制液压流量脉动噪声及缓和负载变化压力冲击能力,介绍了新型复式皮囊蓄能器的设计原理。从黏弹性力学出发,建立了复式蓄能器动态性能方程组,仿真分析新型蓄能器和旧式单皮囊蓄能器系统动态性能的差异。基于推导的广义Maxwell力学模型,分析了新型动态系统的性能与其内部参数的联系。计算表明,在低频及等温情况下,新型复式蓄能器比旧式蓄能器能更好地吸收压力脉动和缓和压力冲击;新型蓄能器的复式结构提供更多可调节的内部参数,也为提高液压系统工作性能准备了物质条件。

The design principle of a new double bladder accumulator is introduced with the purposes of improving the dynamic performance,suppressing the pulsation noise and moderating the pressure shock for a bladder accumulator.Based on the viscoelastic mechanics,the dynamic equations of double bladder accumulator are set up.The differences of dynamic performance between the new double bladder accumulator and the old one are analyzed.The relations between the internal parameters and dynamic performance of the new dynamic system are analyzed based on the derived generalized Maxwell model.The simulation analysis shows that under a low frequency and isothermal condition,the new double bladder accumulators abilities of suppressing the pulsation noise and moderating the pressure shock are better than that of the old one;the new double bladder accumulator provides more adjustable internal parameters,and helps improve the working performance of the hydraulic system.