摘要
大型起竖装置普遍采用多级液压缸驱动,在缸体初始长度相同的情况下,多级缸较单级缸行程更长,但是其结构也更复杂。为得到多级缸的特性,基于容腔节点法建立了多级缸的运动模型,考虑润滑油膜的信息改进了Lu Gre摩擦力模型,采用迟滞因子的等效阻尼模型改进了接触力模型,完成了多级缸驱动起竖过程的仿真。多级缸换级时作用面积突变,导致压力和速度突变,产生过大的冲击,为减小换级冲击,在缸筒上布置多个缓冲小孔。仿真结果表明:采用缓冲结构后,换级时缸筒同步运动,将压力突变转化为缓变,提前将压力增大至下一级缸筒工作压力,大幅度减小了换级时的速度和加速度波动。
Telescopic hydraulic cylinder is widely used in large erecting devices. Telescopic cylinder can provide longer stroke compared to single stage cylinder. However, its structure is complex. In order to get the characteristics of telescopic cylinder, a motion model is established based on the cavity node method. The LuGre friction model is improved by considering the lubricant film. The contact force model is improved using the equivalent damping model of the hysteresis factor. The process of erection driven by telescopic cylinder is simulated. The action area mutates when the telescopic cylinder converts one stage to other stage, which leads to the sudden change in pressure and velocity, and excessive impact. In order to reduce the impact, many buffer holes are arranged on the cylinder barrel. The simulated results show that the cylinders synchronously move in the replacement of stage after the buffer structure is used. The sudden change in pressure is transferred into slow change. The pressure is raised to the next working pressure in advance, thus greatly reducing the fluctuations of velocity and acceleration.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2016年第12期2268-2276,共9页
Acta Armamentarii
基金
国家自然科学基金项目(51475462)
关键词
兵器科学与技术
多级液压缸
起竖
换级碰撞
级间缓冲
ordnance science and technology
telescopic hydraulic cylinder
erection
inter-stage contact
inter-stage buffer
