基于AMESim的带阻尼调节器的电液换向阀仿真研究

运用AMESim对带双阻尼调节器的电液换向阀进行建模,利用回油腔开口参数设置得到Y型中位机能的先导阀模型并验证了模型的正确性。通过对不同阻尼孔径仿真,得到对应的主阀芯速度曲线和位移曲线,得出使用阻尼调节器可以减慢主阀芯的换向速度、减小液压冲击、降低系统的振动和噪声的结果。对不同黏性阻尼系数仿真,得到其对电液换向阀的开启响应的影响,为带阻尼调节器的电液换向阀的设计、选择和应用提供了参考依据。

基于变阻尼调节器与负载观测器的永磁同步电机无源控制

为了改善永磁同步电机(PMSM)系统的收敛性能,减小系统在负载变化情况下的超调量,研究分析了PMSM的阻尼配置以及负载观测问题,设计了一款转矩观测器以及变阻尼调节器。依据PCHD模型结构原理,推出了PMSM系统的PCHD数学模型。采用无源控制的互联和阻尼配置方法,推出了基于PCHD的PMSM控制系统反馈镇定。为了促使系统加速收敛,利用转矩观测器以及变阻尼调节器,推导出定子电压静态平衡点,使得转速能快速的跟踪给定。仿真验证了基于PCHD模型的PMSM无源性控制策略的变阻尼调节器以及负载转矩观测器具有较好的速度和转矩跟踪性能。

Theoretical research on aggregative dynamic pressure damper

To broaden the frequency width and increase the damping coefficient of a dynamic pressure damper, we designed an aggregative dynamic pressure damper (ADPD). Combined with the advantages of traditional dynamic pressure dampers (TDPD), ADPD can not only increase the damping coefficient in wide frequency range for valve control system, but also absorb partial pressure pulsations and impacts in the low and high frequency fields. Based on the theoretical research and the analysis compared with TDPD, we concluded that the ADPD was superior to the TDPD in the middle high frequency field, and the main parameters influencing the performance of the damper were the damping stiffness, orifice flow coefficient, pre-charge pressure, and the volume of the damper accumulator.