Abstract: Taking the luffing mechanism of a certain aerial working platform as the research object , the simulation model was established by software AMESim , and the dynamic characteristics of hydraulic luffing mechanism were analyzed. The per formance of luffing mechanism was improved greatly by using bi-direction counterbalance valve. The results show that in the case of an extemal force disturbance , the spool can quickly reach the force balance and the inlet oil flow can remain constant by using bi-direction counterbalance valve. The opening pressure of counterbalance valve should maintain moderate and smaller valve opening pressure causes sensitivity of load variations , which causes jitter amplitude.

Key words: electromechanical engineering, aerial working platform, luffing mechanism, electronic hydraulic proportional valve, counterbalance valve, dynamical simulation

摘要： 以某型高空作业车的变幅机构为研究对象，运用多领域仿真软件AMESim建立变幅机构的仿真模型，对变幅 机掏的液压系统动态特性进行了仿真分析，通过使用双向外控式平衡阀，使变幅系统的性能得到很大程度的改善c 研究结果表明:当使用双向外控式平衡阀时，在有外力扰动的情况下，间芯能够很快达到受力平衡，使进油流量保持 恒定;平衡阔的开启压力要保持适中，太小的开启压力导致阅芯的载荷变化敏感性，从而引起变幅抖动。

关键词: 机电工程, 高空作业车, 变幅机构, 电液比例换向阀, 平衡阀, 动态仿真