摘要
针对液压起竖油缸在全行程位置处的动力学特性,采用"自由运动-接触变形"模型模拟液压缸的碰撞过程,建立了全行程起竖油缸的运动微分方程,研究了全行程起竖油缸在有无碰撞间隙条件下的振动性能。数值仿真结果表明,由于活塞杆与缸体的碰撞,活塞杆在缸内的振动过程较为复杂。液压油缸系统在振动频率较低时表现为分段线性特征,但在振动频率稍高时表现为非线性;活塞杆与缸体之间的间隙增加了活塞杆的行程,显著减小了活塞杆低频范围内的位移和加速度幅值,减小了活塞杆加速度的高频共振峰值,降低了活塞杆与油缸碰撞力的频率和幅值。研究结果为大型起竖系统的结构设计和控制设计提供了理论基础和分析方法。
The ＂free movement-contact deformation＂ model is adopted to research the dynamics of hydraulic erecting cylinder at full stroke, and the dynamic equations are built. The vibration performance of full stroke cylinder with and without collision-gaps is studied. Numerical results show that the vibration of piston-rod is more complicated in cylinder due to the collision between piston-rods and cylinders. The piecewise linear characteristics are displayed on hydraulic cylinder system under low frequency harmonic load, and the nonlinear characteristics are displayed under slightly high frequency harmonic load. The gap between the piston-rod and the cylinder increases the stroke of the piston-rod, significantly decreases the displacement and acceleration amplitude of the piston-rod in low-range, decreases the high-frequency resonance peak of acceleration of the piston-rod, and decreases the frequency and amplitude of the impact force between the piston-rod and cylinder. The results provide theoretical basis and methods of analysis for structural design and control design of erecting system.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2015年第4期681-686,共6页
Acta Armamentarii
关键词
兵器科学与技术
起竖系统
碰撞
液压油缸
振动
ordnance science and technology
erecting system
collision
hydraulic cylinder
vibration
