摘要
采用液压摆动马达直接控制配流盘旋转的斜盘柱塞式新型液压变压器构造了挖掘机动臂液压系统。针对挖掘机的液压油缸在实际工况中要承受2个方向的负载且负载变化频繁剧烈的问题,将动臂油缸无杆腔与压力共轨高压端相连通,建立了所提出系统的数学模型,并将试验中采集到的挖掘机实际工作过程中动臂油缸的负载数据作为模型的输入;在分析了液压变压器控制角的合理工作范围并提出增加压力反馈回路的控制策略后,对系统的速度响应进行了分析。结果表明提出的动臂系统可以较好地跟踪速度目标信号,在变负载情况下鲁棒性强,从而可以满足工程实际需要。
To enhance the hydraulic system efficiency of excavator, one system which adopted the novel hydraulic transformer （NHT） was proposed to control boom cylinder due to the great recoverable energy of boom. Firstly, according to the tough working period, especially for the load fluctuates frequently and violently, the rod side of the boom cylinder was connected to the high pressure line of common pressure rail （CPR）. Moreover, the proposed system was analyzed by using of mathematical method and the model was constructed. Measurement data about the boom load change of one excavator was input into the simulation model. Finally, the valid angle range of NHT was studied and the pressure feedback loop was applied..Results showed that the proposed system possessed good servo performance under great fluctuating load.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2013年第4期27-32,共6页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金资助项目(50875054
51275123)
哈尔滨工业大学博士生国外访学资助项目
关键词
液压变压器
压力共轨
动臂油缸
动态分析
Hydraulic transformer Common pressure rail Boom cylinder Dynamic analysis
