摘要
针对国产高速经编机与国外设备相比运动精度、稳定性和可靠性较差等亟待提高的难题,考虑了杆长误差及运动副间隙,分析了销轴中心在间隙圆内的分布状态,计算了三种不同类型杆的有效长度,建立了综合考虑两种误差时的槽针机构运动数学模型及可靠性计算模型;使用MATLAB优化工具箱,以各运动副间隙均值为随机设计变量,以满足机构预定可靠度和随机变量取值范围为约束条件,以各运动副间隙均值和最大为目标函数,建立了机构可靠性优化模型,使加工装配精度降到最低;通过对实例进行优化及蒙特卡罗仿真验证,验证了优化结果的正确性。
Compared with foreign equipments,the kinematics accuracy,stability and reliability of domestic high-speed warp knitting machines are terrible and need to be improved.Considering two errors including length errors and clearances of hinged joints,analyzing the distribution of the center of the pin in the gap circle,deriving the calculation formulas of three types of effective length.The motion mathematical model of needle mechanism and the reliability calculation model considering two types of errors were established.Using the MATLAB optimization toolbox,taking the meansof joint clearances as random design variables.The constraint conditions are meeting the institutional reliability and the range of random variable value.Maximize the sum of means of each joint clearance as the objective function,established the optimization model of mechanism reliability.Minimize the precision of manufactureand assembly.The correctness of the optimization results was verified through the optimization and Monte-Carlo simulation verification for example.
作者
聂飞飞
周金宇
曹清林
NIE Fei-fei;ZHOU Jin-yu;CAO Qing-lin(Jiangsu University of Technology,Changzhou Key Laboratory of Equipment Remanufacturing Engineering,Jiangsu Changzhou 213001,China)
出处
《机械设计与制造》
北大核心
2019年第12期40-44,共5页
Machinery Design & Manufacture
基金
江苏省高校自然科学研究重大项目(16KJA460002)
江苏省产业前瞻与共性关键技术重点项目(BE2015007-1)
