摘要
为了给蓄能器在工程机械的应用与参数设置提供参考,针对工程机械液压驱动系统压力冲击频繁问题,通过合理选择蓄能器参数,有效提高该系统的性能。建立了皮囊式蓄能器的数学模型,从理论上分析了影响蓄能器性能的参数与选择方案,并利用AMESIM仿真软件与工程机械液压底盘模拟试验台进行了仿真分析与试验验证。结果表明:蓄能器预充气压力为系统工作压力80%～90%时,既能有效吸收系统的压力冲击,又能保证系统的快速稳定性;蓄能器容积越大,系统响应速度越慢;蓄能器连接管路直径越小,系统压力冲击越明显;连接管路越长,系统压力冲击会增加,但是增加不显著;对于工作在剧烈波动载荷下的工程机械液压驱动系统,应根据系统的压力变化幅度配置不同固有频率的蓄能器组,并分段配置各蓄能器的参数来加宽吸收压力波动的频率宽度与压力冲击范围。
To provide reference for the accumulator application and parameters set in engineering machinery, aimed at the frequent pressure shock of engineering machinery hydraulic drive system, through a reasonable choice of the accumulator parameters to effectively improve the performance of the system, the mathematical model of bladder accumulator was established and the parameters choice which influenced the performance of the accumulator were analyzed theoretically. AMESIM simulation software and engineering machinery hydraulic chassis simulation test bench were used for simulation analysis and experimental verification. The results show that when the accumulator pre-charging pressure is 80%-90% of the system working pressure, not only the impact of system pressure can be absorbed effectively, but also the rapid stability of the system can be guaranteed; the greater the volume of the accumulator, the slower the system response speed; the smaller the diameter of the accumulator connecting pipe, the moreobvious the system hydraulic impact; the longer the connecting pipe, the more the impact of system pressure, although not so obvious; for the engineering machinery hydraulic system, which often works in the seriously fluctuating load, accumulator groups with different natural frequencies should be chosen based on the magnitude of pressure changes of the system, and segmentation parameters choice of the accumulator should be adopted to widen the frequency width of pressure fluctuation and pressure shock range.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2013年第2期183-190,共8页
China Journal of Highway and Transport
基金
道路施工技术与装备教育部重点实验室开放基金项目(CHD2011SY005)
中央高校基本科研业务费专项资金项目(CHD2010ZY010
CHD2011JC042)
