摘要
针对泵控压机液压系统卸压冲击问题,以0.6MN泵控压机为载体,结合功率键合图进行研究,推导出基于噪声声强最弱的理论卸压曲线。搭建了比例变量径向柱塞泵(RKP)模型,并推导出工作缸模型、包含动态摩擦项的修正型分段集中参数管道模型及其它单元模型;以卸压过程中最大声强值最小为目标,运用拉格朗日中值定理,推导出理论卸压曲线;通过仿真对比卸压过程中理论、指数、线性和正弦卸压曲线下的主缸和卸压管压力曲线,并在0.6MN泵控压机上进行实验研究。研究结果表明:基于键合图理论模型的仿真曲线与实测曲线吻合较好,并且理论卸压曲线具有较好的卸压效果,为减小卸压冲击提供了一种有效的新途径。
Point to the problem of pressure-relief shock for the hydraulic system in pump-controlled press, theoretical pressure-relief curve based on the weakest noise intensity was deduced with 0.6 MN pump-controlled press as a support incorporating power bond graph. The model of Proportion Variable Radial Piston Pumps （RKP） was established, while the working cylinder model, the sectional lumped parameter pipe model containing modified dynamic friction term and other unit models were deduced. Aim to obtain the minimum of maximum noise intensity during pressure relief process, the theoretical pressure-relief curve was deduced using Lagrange mean value theory. By simulating the main cylinder and pressure relief pipe pressure curve during pressure relief process under theory, exponential, linear and si- nusoidal unloading curves were compared, and then experimentally studies were carried out on 0. 6 MN pump con- trolled press. The results show that the simulation curve based on bond graph theory model matches actual curve well, in addition, the theoretical pressure-relief curve is of better pressure-relief effect, which is a new effective way for de- creasing pressure-relief shock.
出处
《锻压技术》
CAS
CSCD
北大核心
2013年第6期80-85,共6页
Forging & Stamping Technology
基金
高等学校博士学科点专项科研基金(20101333110001)
国家自然科学基金资助项目(51375422)
秦皇岛市科学技术研究与发展计划项目(201302A020)
关键词
功率键合图
泵控压机
卸压特性
噪声声强
power bond graph
pump-controlled press
pressure-relief characteristic
noise intensity
