作　　者： ; ; ; ;

机构地区： 广东工业大学机电工程学院

出　　处： 《吉林大学学报（工学版）》 2011年第1期149-154,共6页

摘　　要： 为了降低高速吹瓶机中凸轮机构带动的模具合模时出现的接触力,提出了基于机构动力学-控制系统协同仿真和优化的凸轮廓线优化设计方法。首先,建立吹瓶机模具运动控制系统模型,目标函数是在最大接触力约束下运动时间最短。其次,根据赫兹接触理论中接触力与变形量的关系,引入位移状态变量,将高速无冲击凸轮廓线设计问题转化为位移无超调的最速控制问题。通过机构动力学与控制系统协同仿真与优化,获得无超调约束下运动时间最短的控制系统参数和运动速度,并通过调整位移偏置量来实现接触力控制。最后,将最优运动曲线转化为凸轮曲线。仿真结果表明,新设计的凸轮曲线可以在更高速度时保持软着陆,有效降低了振动冲击,疲劳寿命达到1.4×107次。 A new optimal cam profile design method was proposed based on the mechanism dynamics and control system co simulation and optimization to reduce the contact force of the mould dies driven by the can mechanism in a high-speed bottle blowing machine. An optimization model was built for the bottle flowing machine dies motion control system, its objective function is to minimize the time of the bottle die clamping motion under restraint of maximum contact force. A state variable of the displacement of bottle die was introduced based on the relationship between the contact force and contact information according to Hertz contact theory, the high-speed impact-free cam profile design problem was transformed to the fastest control problem without displacement overshooting. The control system parameters and the motion velocity for the fastest motion under restraint of non- overshooting were obtained by the mechanism dynamics and control system co-simulation and optimization, and the control of the contact force was realized by adjustment of displacement offset. The optimal motion curve can be converted into the cam profile. Simulation results show that the optimized cam profile can make the soft landing under high velocity, reduce the impact and vibration, achieve the fatigue life of 1.4× 10^7 cycles.

关 键 词： 机械学 协同仿真与优化 凸轮廓线 机构动力学 最优控制

领　　域： [理学] [理学] [建筑科学]