考虑热误差的电主轴建模与可靠性全局灵敏度分析
Modeling and Reliability Global Sensitivity Analysis of Motorized Spindles Considering Thermal Errors
黄贤振 1于瑞 2姜智元 2荣治明3
作者信息
- 1. 东北大学 机械工程与自动化学院,辽宁 沈阳 110819;东北大学 航空动力装备振动及控制教育部重点实验室,辽宁 沈阳 110819
- 2. 东北大学 机械工程与自动化学院,辽宁 沈阳 110819
- 3. 大连海洋大学 应用技术学院,辽宁 大连 116300
- 折叠
摘要
以数控机床电主轴为研究对象,旨在分析其轴向热伸长量对电主轴可靠性的影响.采用Svenska Kullager-Fabriken(SKF)摩擦力矩模型对轴承生热量进行分析,设定对流换热系数为边界散热条件,建立了热分析有限元耦合模型,求解电主轴的温度以及轴向热伸长分布.将有限元模型与实验结果进行对比,验证了建立的有限元模型的准确性.考虑随机因素的影响,建立电主轴热变形可靠性分析模型,并采用Kriging模型进行可靠性求解.对电主轴热误差可靠性全局灵敏度进行分析,结果表明,转速和冷却水流量对可靠度影响较大,轴向力和径向力对可靠度影响较小.
Abstract
Taking the motorized spindle of computer numerical control machine tools as the research object,the influence of its axial thermal elongation on the reliability of the motorized spindle is explored.The Svenska Kullager-Fabriken(SKF)friction torque model is used to analyze the heat generation of the bearing.The convective heat transfer coefficient is set as the boundary heat dissipation condition.The finite element coupling model of thermal analysis is established to solve the temperature and axial thermal elongation distribution of the spindle.The finite element model is compared with the experimental results to verify the accuracy of the established finite element model.Considering the influence of random factors,the reliability analysis model of spindle thermal deformation is established,and the reliability is solved by the Kriging model.Finally,the global sensitivity analysis of the thermal error reliability of the motorized spindle is carried out.The results show that the rotational speed and cooling water flow have a great influence on the reliability,and the axial force and radial force have little influence on the reliability.
关键词
电主轴/热特性/有限元分析/Kriging模型/可靠性/全局灵敏度Key words
motorized spindle/thermal characteristics/finite element analysis/Kriging model/reliability/global sensitivity引用本文复制引用
基金项目
国家自然科学基金资助项目(U22B2087)
国家自然科学基金资助项目(U23B2098)
辽宁省应用基础研究计划项目(2023JH2/101300160)
辽宁省教育厅高校基本科研资助项目(LJKQZ2021124)
出版年
2024
NETL
NSTL
万方数据